# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
# pylint: disable=C,R,W
import logging
import re
from contextlib import closing
from datetime import datetime, timedelta
from typing import Any, cast, Dict, List, Optional, Union
from urllib import parse

import backoff
import msgpack
import pandas as pd
import pyarrow as pa
import simplejson as json
from flask import (
    abort,
    flash,
    g,
    Markup,
    redirect,
    render_template,
    request,
    Response,
    url_for,
)
from flask_appbuilder import expose
from flask_appbuilder.models.sqla.interface import SQLAInterface
from flask_appbuilder.security.decorators import has_access, has_access_api
from flask_appbuilder.security.sqla import models as ab_models
from flask_babel import gettext as __, lazy_gettext as _
from sqlalchemy import and_, Integer, or_, select
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm.session import Session
from werkzeug.routing import BaseConverter
from werkzeug.urls import Href

import superset.models.core as models
from superset import (
    app,
    appbuilder,
    cache,
    conf,
    dataframe,
    db,
    event_logger,
    get_feature_flags,
    is_feature_enabled,
    result_set,
    results_backend,
    results_backend_use_msgpack,
    security_manager,
    sql_lab,
    talisman,
    viz,
)
from superset.connectors.connector_registry import ConnectorRegistry
from superset.connectors.sqla.models import AnnotationDatasource
from superset.constants import RouteMethod
from superset.exceptions import (
    DatabaseNotFound,
    SupersetException,
    SupersetSecurityException,
    SupersetTimeoutException,
)
from superset.jinja_context import get_template_processor
from superset.models.dashboard import Dashboard
from superset.models.datasource_access_request import DatasourceAccessRequest
from superset.models.slice import Slice
from superset.models.sql_lab import Query, TabState
from superset.models.user_attributes import UserAttribute
from superset.sql_parse import ParsedQuery
from superset.sql_validators import get_validator_by_name
from superset.utils import core as utils, dashboard_import_export
from superset.utils.dates import now_as_float
from superset.utils.decorators import etag_cache, stats_timing
from superset.views.chart import views as chart_views

from .base import (
    api,
    BaseFilter,
    BaseSupersetView,
    check_ownership,
    common_bootstrap_payload,
    CsvResponse,
    data_payload_response,
    DeleteMixin,
    generate_download_headers,
    get_error_msg,
    get_user_roles,
    handle_api_exception,
    json_error_response,
    json_success,
    SupersetModelView,
)
from .dashboard import views as dash_views
from .database import views as in_views
from .utils import (
    apply_display_max_row_limit,
    bootstrap_user_data,
    get_datasource_info,
    get_form_data,
    get_viz,
)

config = app.config
CACHE_DEFAULT_TIMEOUT = config["CACHE_DEFAULT_TIMEOUT"]
SQLLAB_QUERY_COST_ESTIMATE_TIMEOUT = config["SQLLAB_QUERY_COST_ESTIMATE_TIMEOUT"]
stats_logger = config["STATS_LOGGER"]
DAR = DatasourceAccessRequest
QueryStatus = utils.QueryStatus

DATABASE_KEYS = [
    "allow_csv_upload",
    "allow_ctas",
    "allow_dml",
    "allow_multi_schema_metadata_fetch",
    "allow_run_async",
    "allows_subquery",
    "backend",
    "database_name",
    "expose_in_sqllab",
    "force_ctas_schema",
    "id",
]


ALL_DATASOURCE_ACCESS_ERR = __(
    "This endpoint requires the `all_datasource_access` permission"
)
DATASOURCE_MISSING_ERR = __("The data source seems to have been deleted")
ACCESS_REQUEST_MISSING_ERR = __("The access requests seem to have been deleted")
USER_MISSING_ERR = __("The user seems to have been deleted")

FORM_DATA_KEY_BLACKLIST: List[str] = []
if not config["ENABLE_JAVASCRIPT_CONTROLS"]:
    FORM_DATA_KEY_BLACKLIST = ["js_tooltip", "js_onclick_href", "js_data_mutator"]


def get_database_access_error_msg(database_name):
    return __(
        "This view requires the database %(name)s or "
        "`all_datasource_access` permission",
        name=database_name,
    )


def is_owner(obj, user):
    """ Check if user is owner of the slice """
    return obj and user in obj.owners


def check_datasource_perms(
    self, datasource_type: str = None, datasource_id: int = None
) -> None:
    """
    Check if user can access a cached response from explore_json.

    This function takes `self` since it must have the same signature as the
    the decorated method.

    :param datasource_type: The datasource type, i.e., 'druid' or 'table'
    :param datasource_id: The datasource ID
    :raises SupersetSecurityException: If the user cannot access the resource
    """

    form_data = get_form_data()[0]

    try:
        datasource_id, datasource_type = get_datasource_info(
            datasource_id, datasource_type, form_data
        )
    except SupersetException as e:
        raise SupersetSecurityException(str(e))

    viz_obj = get_viz(
        datasource_type=datasource_type,
        datasource_id=datasource_id,
        form_data=form_data,
        force=False,
    )

    security_manager.assert_viz_permission(viz_obj)


def check_slice_perms(self, slice_id):
    """
    Check if user can access a cached response from slice_json.

    This function takes `self` since it must have the same signature as the
    the decorated method.
    """

    form_data, slc = get_form_data(slice_id, use_slice_data=True)

    viz_obj = get_viz(
        datasource_type=slc.datasource.type,
        datasource_id=slc.datasource.id,
        form_data=form_data,
        force=False,
    )

    security_manager.assert_viz_permission(viz_obj)


def _deserialize_results_payload(
    payload: Union[bytes, str], query, use_msgpack: Optional[bool] = False
) -> dict:
    logging.debug(f"Deserializing from msgpack: {use_msgpack}")
    if use_msgpack:
        with stats_timing(
            "sqllab.query.results_backend_msgpack_deserialize", stats_logger
        ):
            ds_payload = msgpack.loads(payload, raw=False)

        with stats_timing("sqllab.query.results_backend_pa_deserialize", stats_logger):
            pa_table = pa.deserialize(ds_payload["data"])

        df = result_set.SupersetResultSet.convert_table_to_df(pa_table)
        ds_payload["data"] = dataframe.df_to_records(df) or []

        db_engine_spec = query.database.db_engine_spec
        all_columns, data, expanded_columns = db_engine_spec.expand_data(
            ds_payload["selected_columns"], ds_payload["data"]
        )
        ds_payload.update(
            {"data": data, "columns": all_columns, "expanded_columns": expanded_columns}
        )

        return ds_payload
    else:
        with stats_timing(
            "sqllab.query.results_backend_json_deserialize", stats_logger
        ):
            return json.loads(payload)  # type: ignore


class AccessRequestsModelView(SupersetModelView, DeleteMixin):
    datamodel = SQLAInterface(DAR)
    include_route_methods = RouteMethod.CRUD_SET
    list_columns = [
        "username",
        "user_roles",
        "datasource_link",
        "roles_with_datasource",
        "created_on",
    ]
    order_columns = ["created_on"]
    base_order = ("changed_on", "desc")
    label_columns = {
        "username": _("User"),
        "user_roles": _("User Roles"),
        "database": _("Database URL"),
        "datasource_link": _("Datasource"),
        "roles_with_datasource": _("Roles to grant"),
        "created_on": _("Created On"),
    }


@talisman(force_https=False)
@app.route("/health")
def health():
    return "OK"


@talisman(force_https=False)
@app.route("/healthcheck")
def healthcheck():
    return "OK"


@talisman(force_https=False)
@app.route("/ping")
def ping():
    return "OK"


class KV(BaseSupersetView):

    """Used for storing and retrieving key value pairs"""

    @event_logger.log_this
    @has_access_api
    @expose("/store/", methods=["POST"])
    def store(self):
        try:
            value = request.form.get("data")
            obj = models.KeyValue(value=value)
            db.session.add(obj)
            db.session.commit()
        except Exception as e:
            return json_error_response(e)
        return Response(json.dumps({"id": obj.id}), status=200)

    @event_logger.log_this
    @has_access_api
    @expose("/<key_id>/", methods=["GET"])
    def get_value(self, key_id):
        try:
            kv = db.session.query(models.KeyValue).filter_by(id=key_id).scalar()
            if not kv:
                return Response(status=404, content_type="text/plain")
        except Exception as e:
            return json_error_response(e)
        return Response(kv.value, status=200, content_type="text/plain")


class R(BaseSupersetView):

    """used for short urls"""

    @event_logger.log_this
    @expose("/<url_id>")
    def index(self, url_id):
        url = db.session.query(models.Url).get(url_id)
        if url and url.url:
            explore_url = "//superset/explore/?"
            if url.url.startswith(explore_url):
                explore_url += f"r={url_id}"
                return redirect(explore_url[1:])
            else:
                return redirect(url.url[1:])
        else:
            flash("URL to nowhere...", "danger")
            return redirect("/")

    @event_logger.log_this
    @has_access_api
    @expose("/shortner/", methods=["POST"])
    def shortner(self):
        url = request.form.get("data")
        obj = models.Url(url=url)
        db.session.add(obj)
        db.session.commit()
        return Response(
            "{scheme}://{request.headers[Host]}/r/{obj.id}".format(
                scheme=request.scheme, request=request, obj=obj
            ),
            mimetype="text/plain",
        )


class Superset(BaseSupersetView):
    """The base views for Superset!"""

    logger = logging.getLogger(__name__)

    @has_access_api
    @expose("/datasources/")
    def datasources(self):
        datasources = ConnectorRegistry.get_all_datasources(db.session)
        datasources = [o.short_data for o in datasources if o.short_data.get("name")]
        datasources = sorted(datasources, key=lambda o: o["name"])
        return self.json_response(datasources)

    @has_access_api
    @expose("/override_role_permissions/", methods=["POST"])
    def override_role_permissions(self):
        """Updates the role with the give datasource permissions.

          Permissions not in the request will be revoked. This endpoint should
          be available to admins only. Expects JSON in the format:
           {
            'role_name': '{role_name}',
            'database': [{
                'datasource_type': '{table|druid}',
                'name': '{database_name}',
                'schema': [{
                    'name': '{schema_name}',
                    'datasources': ['{datasource name}, {datasource name}']
                }]
            }]
        }
        """
        data = request.get_json(force=True)
        role_name = data["role_name"]
        databases = data["database"]

        db_ds_names = set()
        for dbs in databases:
            for schema in dbs["schema"]:
                for ds_name in schema["datasources"]:
                    fullname = utils.get_datasource_full_name(
                        dbs["name"], ds_name, schema=schema["name"]
                    )
                    db_ds_names.add(fullname)

        existing_datasources = ConnectorRegistry.get_all_datasources(db.session)
        datasources = [d for d in existing_datasources if d.full_name in db_ds_names]
        role = security_manager.find_role(role_name)
        # remove all permissions
        role.permissions = []
        # grant permissions to the list of datasources
        granted_perms = []
        for datasource in datasources:
            view_menu_perm = security_manager.find_permission_view_menu(
                view_menu_name=datasource.perm, permission_name="datasource_access"
            )
            # prevent creating empty permissions
            if view_menu_perm and view_menu_perm.view_menu:
                role.permissions.append(view_menu_perm)
                granted_perms.append(view_menu_perm.view_menu.name)
        db.session.commit()
        return self.json_response(
            {"granted": granted_perms, "requested": list(db_ds_names)}, status=201
        )

    @event_logger.log_this
    @has_access
    @expose("/request_access/")
    def request_access(self):
        datasources = set()
        dashboard_id = request.args.get("dashboard_id")
        if dashboard_id:
            dash = db.session.query(Dashboard).filter_by(id=int(dashboard_id)).one()
            datasources |= dash.datasources
        datasource_id = request.args.get("datasource_id")
        datasource_type = request.args.get("datasource_type")
        if datasource_id:
            ds_class = ConnectorRegistry.sources.get(datasource_type)
            datasource = (
                db.session.query(ds_class).filter_by(id=int(datasource_id)).one()
            )
            datasources.add(datasource)

        has_access = all(
            (
                datasource and security_manager.datasource_access(datasource)
                for datasource in datasources
            )
        )
        if has_access:
            return redirect("/superset/dashboard/{}".format(dashboard_id))

        if request.args.get("action") == "go":
            for datasource in datasources:
                access_request = DAR(
                    datasource_id=datasource.id, datasource_type=datasource.type
                )
                db.session.add(access_request)
                db.session.commit()
            flash(__("Access was requested"), "info")
            return redirect("/")

        return self.render_template(
            "superset/request_access.html",
            datasources=datasources,
            datasource_names=", ".join([o.name for o in datasources]),
        )

    @event_logger.log_this
    @has_access
    @expose("/approve")
    def approve(self):
        def clean_fulfilled_requests(session):
            for r in session.query(DAR).all():
                datasource = ConnectorRegistry.get_datasource(
                    r.datasource_type, r.datasource_id, session
                )
                if not datasource or security_manager.datasource_access(datasource):
                    # datasource does not exist anymore
                    session.delete(r)
            session.commit()

        datasource_type = request.args.get("datasource_type")
        datasource_id = request.args.get("datasource_id")
        created_by_username = request.args.get("created_by")
        role_to_grant = request.args.get("role_to_grant")
        role_to_extend = request.args.get("role_to_extend")

        session = db.session
        datasource = ConnectorRegistry.get_datasource(
            datasource_type, datasource_id, session
        )

        if not datasource:
            flash(DATASOURCE_MISSING_ERR, "alert")
            return json_error_response(DATASOURCE_MISSING_ERR)

        requested_by = security_manager.find_user(username=created_by_username)
        if not requested_by:
            flash(USER_MISSING_ERR, "alert")
            return json_error_response(USER_MISSING_ERR)

        requests = (
            session.query(DAR)
            .filter(
                DAR.datasource_id == datasource_id,
                DAR.datasource_type == datasource_type,
                DAR.created_by_fk == requested_by.id,
            )
            .all()
        )

        if not requests:
            flash(ACCESS_REQUEST_MISSING_ERR, "alert")
            return json_error_response(ACCESS_REQUEST_MISSING_ERR)

        # check if you can approve
        if security_manager.all_datasource_access() or check_ownership(
            datasource, raise_if_false=False
        ):
            # can by done by admin only
            if role_to_grant:
                role = security_manager.find_role(role_to_grant)
                requested_by.roles.append(role)
                msg = __(
                    "%(user)s was granted the role %(role)s that gives access "
                    "to the %(datasource)s",
                    user=requested_by.username,
                    role=role_to_grant,
                    datasource=datasource.full_name,
                )
                utils.notify_user_about_perm_udate(
                    g.user,
                    requested_by,
                    role,
                    datasource,
                    "email/role_granted.txt",
                    app.config,
                )
                flash(msg, "info")

            if role_to_extend:
                perm_view = security_manager.find_permission_view_menu(
                    "email/datasource_access", datasource.perm
                )
                role = security_manager.find_role(role_to_extend)
                security_manager.add_permission_role(role, perm_view)
                msg = __(
                    "Role %(r)s was extended to provide the access to "
                    "the datasource %(ds)s",
                    r=role_to_extend,
                    ds=datasource.full_name,
                )
                utils.notify_user_about_perm_udate(
                    g.user,
                    requested_by,
                    role,
                    datasource,
                    "email/role_extended.txt",
                    app.config,
                )
                flash(msg, "info")
            clean_fulfilled_requests(session)
        else:
            flash(__("You have no permission to approve this request"), "danger")
            return redirect("/accessrequestsmodelview/list/")
        for r in requests:
            session.delete(r)
        session.commit()
        return redirect("/accessrequestsmodelview/list/")

    def get_viz(
        self,
        slice_id=None,
        form_data=None,
        datasource_type=None,
        datasource_id=None,
        force=False,
    ):
        if slice_id:
            slc = db.session.query(Slice).filter_by(id=slice_id).one()
            return slc.get_viz()
        else:
            viz_type = form_data.get("viz_type", "table")
            datasource = ConnectorRegistry.get_datasource(
                datasource_type, datasource_id, db.session
            )
            viz_obj = viz.viz_types[viz_type](
                datasource, form_data=form_data, force=force
            )
            return viz_obj

    @has_access
    @expose("/slice/<slice_id>/")
    def slice(self, slice_id):
        form_data, slc = get_form_data(slice_id, use_slice_data=True)
        if not slc:
            abort(404)
        endpoint = "/superset/explore/?form_data={}".format(
            parse.quote(json.dumps({"slice_id": slice_id}))
        )
        param = utils.ReservedUrlParameters.STANDALONE.value
        if request.args.get(param) == "true":
            endpoint += f"&{param}=true"
        return redirect(endpoint)

    def get_query_string_response(self, viz_obj):
        query = None
        try:
            query_obj = viz_obj.query_obj()
            if query_obj:
                query = viz_obj.datasource.get_query_str(query_obj)
        except Exception as e:
            logging.exception(e)
            return json_error_response(e)

        if not query:
            query = "No query."

        return self.json_response(
            {"query": query, "language": viz_obj.datasource.query_language}
        )

    def get_raw_results(self, viz_obj):
        return self.json_response(
            {"data": viz_obj.get_df_payload()["df"].to_dict("records")}
        )

    def get_samples(self, viz_obj):
        return self.json_response({"data": viz_obj.get_samples()})

    def generate_json(
        self, viz_obj, csv=False, query=False, results=False, samples=False
    ):
        if csv:
            return CsvResponse(
                viz_obj.get_csv(),
                status=200,
                headers=generate_download_headers("csv"),
                mimetype="application/csv",
            )

        if query:
            return self.get_query_string_response(viz_obj)

        if results:
            return self.get_raw_results(viz_obj)

        if samples:
            return self.get_samples(viz_obj)

        payload = viz_obj.get_payload()
        return data_payload_response(*viz_obj.payload_json_and_has_error(payload))

    @event_logger.log_this
    @api
    @has_access_api
    @expose("/slice_json/<slice_id>")
    @etag_cache(CACHE_DEFAULT_TIMEOUT, check_perms=check_slice_perms)
    def slice_json(self, slice_id):
        form_data, slc = get_form_data(slice_id, use_slice_data=True)
        datasource_type = slc.datasource.type
        datasource_id = slc.datasource.id
        viz_obj = get_viz(
            datasource_type=datasource_type,
            datasource_id=datasource_id,
            form_data=form_data,
            force=False,
        )
        return self.generate_json(viz_obj)

    @event_logger.log_this
    @api
    @has_access_api
    @expose("/annotation_json/<layer_id>")
    def annotation_json(self, layer_id):
        form_data = get_form_data()[0]
        form_data["layer_id"] = layer_id
        form_data["filters"] = [{"col": "layer_id", "op": "==", "val": layer_id}]
        datasource = AnnotationDatasource()
        viz_obj = viz.viz_types["table"](datasource, form_data=form_data, force=False)
        payload = viz_obj.get_payload()
        return data_payload_response(*viz_obj.payload_json_and_has_error(payload))

    EXPLORE_JSON_METHODS = ["POST"]
    if not is_feature_enabled("ENABLE_EXPLORE_JSON_CSRF_PROTECTION"):
        EXPLORE_JSON_METHODS.append("GET")

    @event_logger.log_this
    @api
    @has_access_api
    @handle_api_exception
    @expose(
        "/explore_json/<datasource_type>/<datasource_id>/", methods=EXPLORE_JSON_METHODS
    )
    @expose("/explore_json/", methods=EXPLORE_JSON_METHODS)
    @etag_cache(CACHE_DEFAULT_TIMEOUT, check_perms=check_datasource_perms)
    def explore_json(self, datasource_type=None, datasource_id=None):
        """Serves all request that GET or POST form_data

        This endpoint evolved to be the entry point of many different
        requests that GETs or POSTs a form_data.

        `self.generate_json` receives this input and returns different
        payloads based on the request args in the first block

        TODO: break into one endpoint for each return shape"""
        csv = request.args.get("csv") == "true"
        query = request.args.get("query") == "true"
        results = request.args.get("results") == "true"
        samples = request.args.get("samples") == "true"
        force = request.args.get("force") == "true"
        form_data = get_form_data()[0]

        try:
            datasource_id, datasource_type = get_datasource_info(
                datasource_id, datasource_type, form_data
            )
        except SupersetException as e:
            return json_error_response(utils.error_msg_from_exception(e))

        viz_obj = get_viz(
            datasource_type=datasource_type,
            datasource_id=datasource_id,
            form_data=form_data,
            force=force,
        )

        return self.generate_json(
            viz_obj, csv=csv, query=query, results=results, samples=samples
        )

    @event_logger.log_this
    @has_access
    @expose("/import_dashboards", methods=["GET", "POST"])
    def import_dashboards(self):
        """Overrides the dashboards using json instances from the file."""
        f = request.files.get("file")
        if request.method == "POST" and f:
            try:
                dashboard_import_export.import_dashboards(db.session, f.stream)
            except DatabaseNotFound as e:
                flash(
                    _(
                        "Cannot import dashboard: %(db_error)s.\n"
                        "Make sure to create the database before "
                        "importing the dashboard.",
                        db_error=e,
                    ),
                    "danger",
                )
            except Exception as e:
                logging.exception(e)
                flash(
                    _(
                        "An unknown error occurred. "
                        "Please contact your Superset administrator"
                    ),
                    "danger",
                )
            return redirect("/dashboard/list/")
        return self.render_template("superset/import_dashboards.html")

    @event_logger.log_this
    @has_access
    @expose("/explorev2/<datasource_type>/<datasource_id>/")
    def explorev2(self, datasource_type, datasource_id):
        """Deprecated endpoint, here for backward compatibility of urls"""
        return redirect(
            url_for(
                "Superset.explore",
                datasource_type=datasource_type,
                datasource_id=datasource_id,
                **request.args,
            )
        )

    @event_logger.log_this
    @has_access
    @expose("/explore/<datasource_type>/<datasource_id>/", methods=["GET", "POST"])
    @expose("/explore/", methods=["GET", "POST"])
    def explore(self, datasource_type=None, datasource_id=None):
        user_id = g.user.get_id() if g.user else None
        form_data, slc = get_form_data(use_slice_data=True)

        # Flash the SIP-15 message if the slice is owned by the current user and has not
        # been updated, i.e., is not using the [start, end) interval.
        if (
            config["SIP_15_ENABLED"]
            and slc
            and g.user in slc.owners
            and (
                not form_data.get("time_range_endpoints")
                or form_data["time_range_endpoints"]
                != (
                    utils.TimeRangeEndpoint.INCLUSIVE,
                    utils.TimeRangeEndpoint.EXCLUSIVE,
                )
            )
        ):
            url = Href("/superset/explore/")(
                {
                    "form_data": json.dumps(
                        {
                            "slice_id": slc.id,
                            "time_range_endpoints": (
                                utils.TimeRangeEndpoint.INCLUSIVE.value,
                                utils.TimeRangeEndpoint.EXCLUSIVE.value,
                            ),
                        }
                    )
                }
            )

            flash(Markup(config["SIP_15_TOAST_MESSAGE"].format(url=url)))

        error_redirect = "/chart/list/"
        try:
            datasource_id, datasource_type = get_datasource_info(
                datasource_id, datasource_type, form_data
            )
        except SupersetException:
            return redirect(error_redirect)

        datasource = ConnectorRegistry.get_datasource(
            datasource_type, datasource_id, db.session
        )
        if not datasource:
            flash(DATASOURCE_MISSING_ERR, "danger")
            return redirect(error_redirect)

        if config["ENABLE_ACCESS_REQUEST"] and (
            not security_manager.datasource_access(datasource)
        ):
            flash(
                __(security_manager.get_datasource_access_error_msg(datasource)),
                "danger",
            )
            return redirect(
                "superset/request_access/?"
                f"datasource_type={datasource_type}&"
                f"datasource_id={datasource_id}&"
            )

        viz_type = form_data.get("viz_type")
        if not viz_type and datasource.default_endpoint:
            return redirect(datasource.default_endpoint)

        # slc perms
        slice_add_perm = security_manager.can_access("can_add", "SliceModelView")
        slice_overwrite_perm = is_owner(slc, g.user)
        slice_download_perm = security_manager.can_access(
            "can_download", "SliceModelView"
        )

        form_data["datasource"] = str(datasource_id) + "__" + datasource_type

        # On explore, merge legacy and extra filters into the form data
        utils.convert_legacy_filters_into_adhoc(form_data)
        utils.merge_extra_filters(form_data)

        # merge request url params
        if request.method == "GET":
            utils.merge_request_params(form_data, request.args)

        # handle save or overwrite
        action = request.args.get("action")

        if action == "overwrite" and not slice_overwrite_perm:
            return json_error_response(
                _("You don't have the rights to ") + _("alter this ") + _("chart"),
                status=400,
            )

        if action == "saveas" and not slice_add_perm:
            return json_error_response(
                _("You don't have the rights to ") + _("create a ") + _("chart"),
                status=400,
            )

        if action in ("saveas", "overwrite"):
            return self.save_or_overwrite_slice(
                request.args,
                slc,
                slice_add_perm,
                slice_overwrite_perm,
                slice_download_perm,
                datasource_id,
                datasource_type,
                datasource.name,
            )

        standalone = (
            request.args.get(utils.ReservedUrlParameters.STANDALONE.value) == "true"
        )
        bootstrap_data = {
            "can_add": slice_add_perm,
            "can_download": slice_download_perm,
            "can_overwrite": slice_overwrite_perm,
            "datasource": datasource.data,
            "form_data": form_data,
            "datasource_id": datasource_id,
            "datasource_type": datasource_type,
            "slice": slc.data if slc else None,
            "standalone": standalone,
            "user_id": user_id,
            "forced_height": request.args.get("height"),
            "common": common_bootstrap_payload(),
        }
        table_name = (
            datasource.table_name
            if datasource_type == "table"
            else datasource.datasource_name
        )
        if slc:
            title = slc.slice_name
        else:
            title = _("Explore - %(table)s", table=table_name)
        return self.render_template(
            "superset/basic.html",
            bootstrap_data=json.dumps(
                bootstrap_data, default=utils.pessimistic_json_iso_dttm_ser
            ),
            entry="explore",
            title=title,
            standalone_mode=standalone,
        )

    @api
    @handle_api_exception
    @has_access_api
    @expose("/filter/<datasource_type>/<datasource_id>/<column>/")
    def filter(self, datasource_type, datasource_id, column):
        """
        Endpoint to retrieve values for specified column.

        :param datasource_type: Type of datasource e.g. table
        :param datasource_id: Datasource id
        :param column: Column name to retrieve values for
        :return:
        """
        # TODO: Cache endpoint by user, datasource and column
        datasource = ConnectorRegistry.get_datasource(
            datasource_type, datasource_id, db.session
        )
        if not datasource:
            return json_error_response(DATASOURCE_MISSING_ERR)
        security_manager.assert_datasource_permission(datasource)
        payload = json.dumps(
            datasource.values_for_column(column, config["FILTER_SELECT_ROW_LIMIT"]),
            default=utils.json_int_dttm_ser,
        )
        return json_success(payload)

    def save_or_overwrite_slice(
        self,
        args,
        slc,
        slice_add_perm,
        slice_overwrite_perm,
        slice_download_perm,
        datasource_id,
        datasource_type,
        datasource_name,
    ):
        """Save or overwrite a slice"""
        slice_name = args.get("slice_name")
        action = args.get("action")
        form_data = get_form_data()[0]

        if action in ("saveas"):
            if "slice_id" in form_data:
                form_data.pop("slice_id")  # don't save old slice_id
            slc = Slice(owners=[g.user] if g.user else [])

        slc.params = json.dumps(form_data, indent=2, sort_keys=True)
        slc.datasource_name = datasource_name
        slc.viz_type = form_data["viz_type"]
        slc.datasource_type = datasource_type
        slc.datasource_id = datasource_id
        slc.slice_name = slice_name

        if action in ("saveas") and slice_add_perm:
            self.save_slice(slc)
        elif action == "overwrite" and slice_overwrite_perm:
            self.overwrite_slice(slc)

        # Adding slice to a dashboard if requested
        dash = None
        if request.args.get("add_to_dash") == "existing":
            dash = (
                db.session.query(Dashboard)
                .filter_by(id=int(request.args.get("save_to_dashboard_id")))
                .one()
            )
            # check edit dashboard permissions
            dash_overwrite_perm = check_ownership(dash, raise_if_false=False)
            if not dash_overwrite_perm:
                return json_error_response(
                    _("You don't have the rights to ")
                    + _("alter this ")
                    + _("dashboard"),
                    status=400,
                )

            flash(
                _("Chart [{}] was added to dashboard [{}]").format(
                    slc.slice_name, dash.dashboard_title
                ),
                "info",
            )
        elif request.args.get("add_to_dash") == "new":
            # check create dashboard permissions
            dash_add_perm = security_manager.can_access("can_add", "DashboardModelView")
            if not dash_add_perm:
                return json_error_response(
                    _("You don't have the rights to ")
                    + _("create a ")
                    + _("dashboard"),
                    status=400,
                )

            dash = Dashboard(
                dashboard_title=request.args.get("new_dashboard_name"),
                owners=[g.user] if g.user else [],
            )
            flash(
                _(
                    "Dashboard [{}] just got created and chart [{}] was added " "to it"
                ).format(dash.dashboard_title, slc.slice_name),
                "info",
            )

        if dash and slc not in dash.slices:
            dash.slices.append(slc)
            db.session.commit()

        response = {
            "can_add": slice_add_perm,
            "can_download": slice_download_perm,
            "can_overwrite": is_owner(slc, g.user),
            "form_data": slc.form_data,
            "slice": slc.data,
            "dashboard_id": dash.id if dash else None,
        }

        if request.args.get("goto_dash") == "true":
            response.update({"dashboard": dash.url})

        return json_success(json.dumps(response))

    def save_slice(self, slc):
        session = db.session()
        msg = _("Chart [{}] has been saved").format(slc.slice_name)
        session.add(slc)
        session.commit()
        flash(msg, "info")

    def overwrite_slice(self, slc):
        session = db.session()
        session.merge(slc)
        session.commit()
        msg = _("Chart [{}] has been overwritten").format(slc.slice_name)
        flash(msg, "info")

    @api
    @has_access_api
    @expose("/checkbox/<model_view>/<id_>/<attr>/<value>", methods=["GET"])
    def checkbox(self, model_view, id_, attr, value):
        """endpoint for checking/unchecking any boolean in a sqla model"""
        modelview_to_model = {
            "{}ColumnInlineView".format(name.capitalize()): source.column_class
            for name, source in ConnectorRegistry.sources.items()
        }
        model = modelview_to_model[model_view]
        col = db.session.query(model).get(id_)
        checked = value == "true"
        if col:
            setattr(col, attr, checked)
            if checked:
                metrics = col.get_metrics().values()
                col.datasource.add_missing_metrics(metrics)
            db.session.commit()
        return json_success('"OK"')

    @api
    @has_access_api
    @expose("/schemas/<db_id>/")
    @expose("/schemas/<db_id>/<force_refresh>/")
    def schemas(self, db_id, force_refresh="false"):
        db_id = int(db_id)
        force_refresh = force_refresh.lower() == "true"
        database = db.session.query(models.Database).get(db_id)
        if database:
            schemas = database.get_all_schema_names(
                cache=database.schema_cache_enabled,
                cache_timeout=database.schema_cache_timeout,
                force=force_refresh,
            )
            schemas = security_manager.schemas_accessible_by_user(database, schemas)
        else:
            schemas = []

        return Response(json.dumps({"schemas": schemas}), mimetype="application/json")

    @api
    @has_access_api
    @expose("/tables/<db_id>/<schema>/<substr>/")
    @expose("/tables/<db_id>/<schema>/<substr>/<force_refresh>/")
    def tables(self, db_id, schema, substr, force_refresh="false"):
        """Endpoint to fetch the list of tables for given database"""
        db_id = int(db_id)
        force_refresh = force_refresh.lower() == "true"
        schema = utils.parse_js_uri_path_item(schema, eval_undefined=True)
        substr = utils.parse_js_uri_path_item(substr, eval_undefined=True)
        database = db.session.query(models.Database).filter_by(id=db_id).one()

        if schema:
            tables = (
                database.get_all_table_names_in_schema(
                    schema=schema,
                    force=force_refresh,
                    cache=database.table_cache_enabled,
                    cache_timeout=database.table_cache_timeout,
                )
                or []
            )
            views = (
                database.get_all_view_names_in_schema(
                    schema=schema,
                    force=force_refresh,
                    cache=database.table_cache_enabled,
                    cache_timeout=database.table_cache_timeout,
                )
                or []
            )
        else:
            tables = database.get_all_table_names_in_database(
                cache=True, force=False, cache_timeout=24 * 60 * 60
            )
            views = database.get_all_view_names_in_database(
                cache=True, force=False, cache_timeout=24 * 60 * 60
            )
        tables = security_manager.get_datasources_accessible_by_user(
            database, tables, schema
        )
        views = security_manager.get_datasources_accessible_by_user(
            database, views, schema
        )

        def get_datasource_label(ds_name: utils.DatasourceName) -> str:
            return ds_name.table if schema else f"{ds_name.schema}.{ds_name.table}"

        if substr:
            tables = [tn for tn in tables if substr in get_datasource_label(tn)]
            views = [vn for vn in views if substr in get_datasource_label(vn)]

        if not schema and database.default_schemas:
            user_schema = g.user.email.split("@")[0]
            valid_schemas = set(database.default_schemas + [user_schema])

            tables = [tn for tn in tables if tn.schema in valid_schemas]
            views = [vn for vn in views if vn.schema in valid_schemas]

        max_items = config["MAX_TABLE_NAMES"] or len(tables)
        total_items = len(tables) + len(views)
        max_tables = len(tables)
        max_views = len(views)
        if total_items and substr:
            max_tables = max_items * len(tables) // total_items
            max_views = max_items * len(views) // total_items

        table_options = [
            {
                "value": tn.table,
                "schema": tn.schema,
                "label": get_datasource_label(tn),
                "title": get_datasource_label(tn),
                "type": "table",
            }
            for tn in tables[:max_tables]
        ]
        table_options.extend(
            [
                {
                    "value": vn.table,
                    "schema": vn.schema,
                    "label": get_datasource_label(vn),
                    "title": get_datasource_label(vn),
                    "type": "view",
                }
                for vn in views[:max_views]
            ]
        )
        table_options.sort(key=lambda value: value["label"])
        payload = {"tableLength": len(tables) + len(views), "options": table_options}
        return json_success(json.dumps(payload))

    @api
    @has_access_api
    @expose("/copy_dash/<dashboard_id>/", methods=["GET", "POST"])
    def copy_dash(self, dashboard_id):
        """Copy dashboard"""
        session = db.session()
        data = json.loads(request.form.get("data"))
        dash = models.Dashboard()
        original_dash = session.query(Dashboard).get(dashboard_id)

        dash.owners = [g.user] if g.user else []
        dash.dashboard_title = data["dashboard_title"]

        if data["duplicate_slices"]:
            # Duplicating slices as well, mapping old ids to new ones
            old_to_new_sliceids = {}
            for slc in original_dash.slices:
                new_slice = slc.clone()
                new_slice.owners = [g.user] if g.user else []
                session.add(new_slice)
                session.flush()
                new_slice.dashboards.append(dash)
                old_to_new_sliceids["{}".format(slc.id)] = "{}".format(new_slice.id)

            # update chartId of layout entities
            # in v2_dash positions json data, chartId should be integer,
            # while in older version slice_id is string type
            for value in data["positions"].values():
                if (
                    isinstance(value, dict)
                    and value.get("meta")
                    and value.get("meta").get("chartId")
                ):
                    old_id = "{}".format(value.get("meta").get("chartId"))
                    new_id = int(old_to_new_sliceids[old_id])
                    value["meta"]["chartId"] = new_id
        else:
            dash.slices = original_dash.slices
        dash.params = original_dash.params

        self._set_dash_metadata(dash, data)
        session.add(dash)
        session.commit()
        dash_json = json.dumps(dash.data)
        session.close()
        return json_success(dash_json)

    @api
    @has_access_api
    @expose("/save_dash/<dashboard_id>/", methods=["GET", "POST"])
    def save_dash(self, dashboard_id):
        """Save a dashboard's metadata"""
        session = db.session()
        dash = session.query(Dashboard).get(dashboard_id)
        check_ownership(dash, raise_if_false=True)
        data = json.loads(request.form.get("data"))
        self._set_dash_metadata(dash, data)
        session.merge(dash)
        session.commit()
        session.close()
        return json_success(json.dumps({"status": "SUCCESS"}))

    @staticmethod
    def _set_dash_metadata(dashboard, data):
        positions = data["positions"]
        # find slices in the position data
        slice_ids = []
        slice_id_to_name = {}
        for value in positions.values():
            if isinstance(value, dict):
                try:
                    slice_id = value["meta"]["chartId"]
                    slice_ids.append(slice_id)
                    slice_id_to_name[slice_id] = value["meta"]["sliceName"]
                except KeyError:
                    pass

        session = db.session()
        current_slices = session.query(Slice).filter(Slice.id.in_(slice_ids)).all()

        dashboard.slices = current_slices

        # update slice names. this assumes user has permissions to update the slice
        # we allow user set slice name be empty string
        for slc in dashboard.slices:
            try:
                new_name = slice_id_to_name[slc.id]
                if slc.slice_name != new_name:
                    slc.slice_name = new_name
                    session.merge(slc)
                    session.flush()
            except KeyError:
                pass

        # remove leading and trailing white spaces in the dumped json
        dashboard.position_json = json.dumps(
            positions, indent=None, separators=(",", ":"), sort_keys=True
        )
        md = dashboard.params_dict
        dashboard.css = data.get("css")
        dashboard.dashboard_title = data["dashboard_title"]

        if "timed_refresh_immune_slices" not in md:
            md["timed_refresh_immune_slices"] = []

        if "filter_scopes" in data:
            md.pop("filter_immune_slices", None)
            md.pop("filter_immune_slice_fields", None)
            md["filter_scopes"] = json.loads(data.get("filter_scopes", "{}"))
        else:
            if "filter_immune_slices" not in md:
                md["filter_immune_slices"] = []
            if "filter_immune_slice_fields" not in md:
                md["filter_immune_slice_fields"] = {}
        md["expanded_slices"] = data["expanded_slices"]
        md["refresh_frequency"] = data.get("refresh_frequency", 0)
        default_filters_data = json.loads(data.get("default_filters", "{}"))
        applicable_filters = {
            key: v for key, v in default_filters_data.items() if int(key) in slice_ids
        }
        md["default_filters"] = json.dumps(applicable_filters)
        if data.get("color_namespace"):
            md["color_namespace"] = data.get("color_namespace")
        if data.get("color_scheme"):
            md["color_scheme"] = data.get("color_scheme")
        if data.get("label_colors"):
            md["label_colors"] = data.get("label_colors")
        dashboard.json_metadata = json.dumps(md)

    @api
    @has_access_api
    @expose("/add_slices/<dashboard_id>/", methods=["POST"])
    def add_slices(self, dashboard_id):
        """Add and save slices to a dashboard"""
        data = json.loads(request.form.get("data"))
        session = db.session()
        dash = session.query(Dashboard).get(dashboard_id)
        check_ownership(dash, raise_if_false=True)
        new_slices = session.query(Slice).filter(Slice.id.in_(data["slice_ids"]))
        dash.slices += new_slices
        session.merge(dash)
        session.commit()
        session.close()
        return "SLICES ADDED"

    @api
    @has_access_api
    @expose("/testconn", methods=["POST", "GET"])
    def testconn(self):
        """Tests a sqla connection"""
        try:
            db_name = request.json.get("name")
            uri = request.json.get("uri")

            # if the database already exists in the database, only its safe (password-masked) URI
            # would be shown in the UI and would be passed in the form data.
            # so if the database already exists and the form was submitted with the safe URI,
            # we assume we should retrieve the decrypted URI to test the connection.
            if db_name:
                existing_database = (
                    db.session.query(models.Database)
                    .filter_by(database_name=db_name)
                    .one_or_none()
                )
                if existing_database and uri == existing_database.safe_sqlalchemy_uri():
                    uri = existing_database.sqlalchemy_uri_decrypted

            # this is the database instance that will be tested
            database = models.Database(
                # extras is sent as json, but required to be a string in the Database model
                extra=json.dumps(request.json.get("extras", {})),
                impersonate_user=request.json.get("impersonate_user"),
                encrypted_extra=json.dumps(request.json.get("encrypted_extra", {})),
            )
            database.set_sqlalchemy_uri(uri)

            username = g.user.username if g.user is not None else None
            engine = database.get_sqla_engine(user_name=username)

            with closing(engine.connect()) as conn:
                conn.scalar(select([1]))
                return json_success('"OK"')
        except Exception as e:
            logging.exception(e)
            return json_error_response(
                "Connection failed!\n\n" "The error message returned was:\n{}".format(e)
            )

    @api
    @has_access_api
    @expose("/recent_activity/<user_id>/", methods=["GET"])
    def recent_activity(self, user_id):
        """Recent activity (actions) for a given user"""
        M = models

        if request.args.get("limit"):
            limit = int(request.args.get("limit"))
        else:
            limit = 1000

        qry = (
            db.session.query(M.Log, M.Dashboard, Slice)
            .outerjoin(M.Dashboard, M.Dashboard.id == M.Log.dashboard_id)
            .outerjoin(Slice, Slice.id == M.Log.slice_id)
            .filter(
                and_(
                    ~M.Log.action.in_(("queries", "shortner", "sql_json")),
                    M.Log.user_id == user_id,
                )
            )
            .order_by(M.Log.dttm.desc())
            .limit(limit)
        )
        payload = []
        for log in qry.all():
            item_url = None
            item_title = None
            if log.Dashboard:
                item_url = log.Dashboard.url
                item_title = log.Dashboard.dashboard_title
            elif log.Slice:
                item_url = log.Slice.slice_url
                item_title = log.Slice.slice_name

            payload.append(
                {
                    "action": log.Log.action,
                    "item_url": item_url,
                    "item_title": item_title,
                    "time": log.Log.dttm,
                }
            )
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/csrf_token/", methods=["GET"])
    def csrf_token(self):
        return Response(
            self.render_template("superset/csrf_token.json"), mimetype="text/json"
        )

    @api
    @has_access_api
    @expose("/available_domains/", methods=["GET"])
    def available_domains(self):
        """
        Returns the list of available Superset Webserver domains (if any)
        defined in config. This enables charts embedded in other apps to
        leverage domain sharding if appropriately configured.
        """
        return Response(
            json.dumps(conf.get("SUPERSET_WEBSERVER_DOMAINS")), mimetype="text/json"
        )

    @api
    @has_access_api
    @expose("/fave_dashboards_by_username/<username>/", methods=["GET"])
    def fave_dashboards_by_username(self, username):
        """This lets us use a user's username to pull favourite dashboards"""
        user = security_manager.find_user(username=username)
        return self.fave_dashboards(user.get_id())

    @api
    @has_access_api
    @expose("/fave_dashboards/<user_id>/", methods=["GET"])
    def fave_dashboards(self, user_id):
        qry = (
            db.session.query(Dashboard, models.FavStar.dttm)
            .join(
                models.FavStar,
                and_(
                    models.FavStar.user_id == int(user_id),
                    models.FavStar.class_name == "Dashboard",
                    Dashboard.id == models.FavStar.obj_id,
                ),
            )
            .order_by(models.FavStar.dttm.desc())
        )
        payload = []
        for o in qry.all():
            d = {
                "id": o.Dashboard.id,
                "dashboard": o.Dashboard.dashboard_link(),
                "title": o.Dashboard.dashboard_title,
                "url": o.Dashboard.url,
                "dttm": o.dttm,
            }
            if o.Dashboard.created_by:
                user = o.Dashboard.created_by
                d["creator"] = str(user)
                d["creator_url"] = "/superset/profile/{}/".format(user.username)
            payload.append(d)
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/created_dashboards/<user_id>/", methods=["GET"])
    def created_dashboards(self, user_id):
        Dash = Dashboard
        qry = (
            db.session.query(Dash)
            .filter(or_(Dash.created_by_fk == user_id, Dash.changed_by_fk == user_id))
            .order_by(Dash.changed_on.desc())
        )
        payload = [
            {
                "id": o.id,
                "dashboard": o.dashboard_link(),
                "title": o.dashboard_title,
                "url": o.url,
                "dttm": o.changed_on,
            }
            for o in qry.all()
        ]
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/user_slices", methods=["GET"])
    @expose("/user_slices/<user_id>/", methods=["GET"])
    def user_slices(self, user_id=None):
        """List of slices a user created, or faved"""
        if not user_id:
            user_id = g.user.id
        FavStar = models.FavStar
        qry = (
            db.session.query(Slice, FavStar.dttm)
            .join(
                models.FavStar,
                and_(
                    models.FavStar.user_id == int(user_id),
                    models.FavStar.class_name == "slice",
                    Slice.id == models.FavStar.obj_id,
                ),
                isouter=True,
            )
            .filter(
                or_(
                    Slice.created_by_fk == user_id,
                    Slice.changed_by_fk == user_id,
                    FavStar.user_id == user_id,
                )
            )
            .order_by(Slice.slice_name.asc())
        )
        payload = [
            {
                "id": o.Slice.id,
                "title": o.Slice.slice_name,
                "url": o.Slice.slice_url,
                "data": o.Slice.form_data,
                "dttm": o.dttm if o.dttm else o.Slice.changed_on,
                "viz_type": o.Slice.viz_type,
            }
            for o in qry.all()
        ]
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/created_slices", methods=["GET"])
    @expose("/created_slices/<user_id>/", methods=["GET"])
    def created_slices(self, user_id=None):
        """List of slices created by this user"""
        if not user_id:
            user_id = g.user.id
        qry = (
            db.session.query(Slice)
            .filter(or_(Slice.created_by_fk == user_id, Slice.changed_by_fk == user_id))
            .order_by(Slice.changed_on.desc())
        )
        payload = [
            {
                "id": o.id,
                "title": o.slice_name,
                "url": o.slice_url,
                "dttm": o.changed_on,
                "viz_type": o.viz_type,
            }
            for o in qry.all()
        ]
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/fave_slices", methods=["GET"])
    @expose("/fave_slices/<user_id>/", methods=["GET"])
    def fave_slices(self, user_id=None):
        """Favorite slices for a user"""
        if not user_id:
            user_id = g.user.id
        qry = (
            db.session.query(Slice, models.FavStar.dttm)
            .join(
                models.FavStar,
                and_(
                    models.FavStar.user_id == int(user_id),
                    models.FavStar.class_name == "slice",
                    Slice.id == models.FavStar.obj_id,
                ),
            )
            .order_by(models.FavStar.dttm.desc())
        )
        payload = []
        for o in qry.all():
            d = {
                "id": o.Slice.id,
                "title": o.Slice.slice_name,
                "url": o.Slice.slice_url,
                "dttm": o.dttm,
                "viz_type": o.Slice.viz_type,
            }
            if o.Slice.created_by:
                user = o.Slice.created_by
                d["creator"] = str(user)
                d["creator_url"] = "/superset/profile/{}/".format(user.username)
            payload.append(d)
        return json_success(json.dumps(payload, default=utils.json_int_dttm_ser))

    @api
    @has_access_api
    @expose("/warm_up_cache/", methods=["GET"])
    def warm_up_cache(self):
        """Warms up the cache for the slice or table.

        Note for slices a force refresh occurs.
        """
        slices = None
        session = db.session()
        slice_id = request.args.get("slice_id")
        table_name = request.args.get("table_name")
        db_name = request.args.get("db_name")

        if not slice_id and not (table_name and db_name):
            return json_error_response(
                __(
                    "Malformed request. slice_id or table_name and db_name "
                    "arguments are expected"
                ),
                status=400,
            )
        if slice_id:
            slices = session.query(Slice).filter_by(id=slice_id).all()
            if not slices:
                return json_error_response(
                    __("Chart %(id)s not found", id=slice_id), status=404
                )
        elif table_name and db_name:
            SqlaTable = ConnectorRegistry.sources["table"]
            table = (
                session.query(SqlaTable)
                .join(models.Database)
                .filter(
                    models.Database.database_name == db_name
                    or SqlaTable.table_name == table_name
                )
            ).one_or_none()
            if not table:
                return json_error_response(
                    __(
                        "Table %(t)s wasn't found in the database %(d)s",
                        t=table_name,
                        s=db_name,
                    ),
                    status=404,
                )
            slices = (
                session.query(Slice)
                .filter_by(datasource_id=table.id, datasource_type=table.type)
                .all()
            )

        for slc in slices:
            try:
                form_data = get_form_data(slc.id, use_slice_data=True)[0]
                obj = get_viz(
                    datasource_type=slc.datasource.type,
                    datasource_id=slc.datasource.id,
                    form_data=form_data,
                    force=True,
                )
                obj.get_json()
            except Exception as e:
                self.logger.exception("Failed to warm up cache")
                return json_error_response(utils.error_msg_from_exception(e))
        return json_success(
            json.dumps(
                [{"slice_id": slc.id, "slice_name": slc.slice_name} for slc in slices]
            )
        )

    @has_access_api
    @expose("/favstar/<class_name>/<obj_id>/<action>/")
    def favstar(self, class_name, obj_id, action):
        """Toggle favorite stars on Slices and Dashboard"""
        session = db.session()
        FavStar = models.FavStar
        count = 0
        favs = (
            session.query(FavStar)
            .filter_by(class_name=class_name, obj_id=obj_id, user_id=g.user.get_id())
            .all()
        )
        if action == "select":
            if not favs:
                session.add(
                    FavStar(
                        class_name=class_name,
                        obj_id=obj_id,
                        user_id=g.user.get_id(),
                        dttm=datetime.now(),
                    )
                )
            count = 1
        elif action == "unselect":
            for fav in favs:
                session.delete(fav)
        else:
            count = len(favs)
        session.commit()
        return json_success(json.dumps({"count": count}))

    @api
    @has_access_api
    @expose("/dashboard/<dashboard_id>/published/", methods=("GET", "POST"))
    def publish(self, dashboard_id):
        """Gets and toggles published status on dashboards"""
        logging.warning(
            "This API endpoint is deprecated and will be removed in version 1.0.0"
        )
        session = db.session()
        Role = ab_models.Role
        dash = (
            session.query(Dashboard).filter(Dashboard.id == dashboard_id).one_or_none()
        )
        admin_role = session.query(Role).filter(Role.name == "Admin").one_or_none()

        if request.method == "GET":
            if dash:
                return json_success(json.dumps({"published": dash.published}))
            else:
                return json_error_response(
                    f"ERROR: cannot find dashboard {dashboard_id}", status=404
                )

        else:
            edit_perm = is_owner(dash, g.user) or admin_role in get_user_roles()
            if not edit_perm:
                return json_error_response(
                    f'ERROR: "{g.user.username}" cannot alter dashboard "{dash.dashboard_title}"',
                    status=403,
                )

            dash.published = str(request.form["published"]).lower() == "true"
            session.commit()
            return json_success(json.dumps({"published": dash.published}))

    @has_access
    @expose("/dashboard/<dashboard_id>/")
    def dashboard(self, dashboard_id):
        """Server side rendering for a dashboard"""
        session = db.session()
        qry = session.query(Dashboard)
        if dashboard_id.isdigit():
            qry = qry.filter_by(id=int(dashboard_id))
        else:
            qry = qry.filter_by(slug=dashboard_id)

        dash = qry.one_or_none()
        if not dash:
            abort(404)
        datasources = set()
        for slc in dash.slices:
            datasource = slc.datasource
            if datasource:
                datasources.add(datasource)

        if config["ENABLE_ACCESS_REQUEST"]:
            for datasource in datasources:
                if datasource and not security_manager.datasource_access(datasource):
                    flash(
                        __(
                            security_manager.get_datasource_access_error_msg(datasource)
                        ),
                        "danger",
                    )
                    return redirect(
                        "superset/request_access/?" f"dashboard_id={dash.id}&"
                    )

        dash_edit_perm = check_ownership(
            dash, raise_if_false=False
        ) and security_manager.can_access("can_save_dash", "Superset")
        dash_save_perm = security_manager.can_access("can_save_dash", "Superset")
        superset_can_explore = security_manager.can_access("can_explore", "Superset")
        superset_can_csv = security_manager.can_access("can_csv", "Superset")
        slice_can_edit = security_manager.can_access("can_edit", "SliceModelView")

        standalone_mode = (
            request.args.get(utils.ReservedUrlParameters.STANDALONE.value) == "true"
        )
        edit_mode = (
            request.args.get(utils.ReservedUrlParameters.EDIT_MODE.value) == "true"
        )

        # Hack to log the dashboard_id properly, even when getting a slug
        @event_logger.log_this
        def dashboard(**kwargs):
            pass

        dashboard(
            dashboard_id=dash.id,
            dashboard_version="v2",
            dash_edit_perm=dash_edit_perm,
            edit_mode=edit_mode,
        )

        dashboard_data = dash.data
        dashboard_data.update(
            {
                "standalone_mode": standalone_mode,
                "dash_save_perm": dash_save_perm,
                "dash_edit_perm": dash_edit_perm,
                "superset_can_explore": superset_can_explore,
                "superset_can_csv": superset_can_csv,
                "slice_can_edit": slice_can_edit,
            }
        )
        url_params = {
            key: value
            for key, value in request.args.items()
            if key not in [param.value for param in utils.ReservedUrlParameters]
        }

        bootstrap_data = {
            "user_id": g.user.get_id(),
            "dashboard_data": dashboard_data,
            "datasources": {ds.uid: ds.data for ds in datasources},
            "common": common_bootstrap_payload(),
            "editMode": edit_mode,
            "urlParams": url_params,
        }

        if request.args.get("json") == "true":
            return json_success(
                json.dumps(bootstrap_data, default=utils.pessimistic_json_iso_dttm_ser)
            )

        return self.render_template(
            "superset/dashboard.html",
            entry="dashboard",
            standalone_mode=standalone_mode,
            title=dash.dashboard_title,
            bootstrap_data=json.dumps(
                bootstrap_data, default=utils.pessimistic_json_iso_dttm_ser
            ),
        )

    @api
    @event_logger.log_this
    @expose("/log/", methods=["POST"])
    def log(self):
        return Response(status=200)

    @has_access
    @expose("/sync_druid/", methods=["POST"])
    @event_logger.log_this
    def sync_druid_source(self):
        """Syncs the druid datasource in main db with the provided config.

        The endpoint takes 3 arguments:
            user - user name to perform the operation as
            cluster - name of the druid cluster
            config - configuration stored in json that contains:
                name: druid datasource name
                dimensions: list of the dimensions, they become druid columns
                    with the type STRING
                metrics_spec: list of metrics (dictionary). Metric consists of
                    2 attributes: type and name. Type can be count,
                    etc. `count` type is stored internally as longSum
                    other fields will be ignored.

            Example: {
                'name': 'test_click',
                'metrics_spec': [{'type': 'count', 'name': 'count'}],
                'dimensions': ['affiliate_id', 'campaign', 'first_seen']
            }
        """
        payload = request.get_json(force=True)
        druid_config = payload["config"]
        user_name = payload["user"]
        cluster_name = payload["cluster"]

        user = security_manager.find_user(username=user_name)
        DruidDatasource = ConnectorRegistry.sources["druid"]
        DruidCluster = DruidDatasource.cluster_class
        if not user:
            err_msg = __(
                "Can't find User '%(name)s', please ask your admin " "to create one.",
                name=user_name,
            )
            logging.error(err_msg)
            return json_error_response(err_msg)
        cluster = (
            db.session.query(DruidCluster)
            .filter_by(cluster_name=cluster_name)
            .one_or_none()
        )
        if not cluster:
            err_msg = __(
                "Can't find DruidCluster with cluster_name = " "'%(name)s'",
                name=cluster_name,
            )
            logging.error(err_msg)
            return json_error_response(err_msg)
        try:
            DruidDatasource.sync_to_db_from_config(druid_config, user, cluster)
        except Exception as e:
            logging.exception(utils.error_msg_from_exception(e))
            return json_error_response(utils.error_msg_from_exception(e))
        return Response(status=201)

    @has_access
    @expose("/sqllab_viz/", methods=["POST"])
    @event_logger.log_this
    def sqllab_viz(self):
        SqlaTable = ConnectorRegistry.sources["table"]
        data = json.loads(request.form.get("data"))
        table_name = data.get("datasourceName")
        database_id = data.get("dbId")
        table = (
            db.session.query(SqlaTable)
            .filter_by(database_id=database_id, table_name=table_name)
            .one_or_none()
        )
        if not table:
            table = SqlaTable(table_name=table_name, owners=[g.user])
        table.database_id = database_id
        table.schema = data.get("schema")
        table.template_params = data.get("templateParams")
        table.is_sqllab_view = True
        q = ParsedQuery(data.get("sql"))
        table.sql = q.stripped()
        db.session.add(table)
        cols = []
        for config in data.get("columns"):
            column_name = config.get("name")
            SqlaTable = ConnectorRegistry.sources["table"]
            TableColumn = SqlaTable.column_class
            SqlMetric = SqlaTable.metric_class
            col = TableColumn(
                column_name=column_name,
                filterable=True,
                groupby=True,
                is_dttm=config.get("is_date", False),
                type=config.get("type", False),
            )
            cols.append(col)

        table.columns = cols
        table.metrics = [SqlMetric(metric_name="count", expression="count(*)")]
        db.session.commit()
        return json_success(json.dumps({"table_id": table.id}))

    @has_access
    @expose("/table/<database_id>/<table_name>/<schema>/")
    @event_logger.log_this
    def table(self, database_id, table_name, schema):
        schema = utils.parse_js_uri_path_item(schema, eval_undefined=True)
        table_name = utils.parse_js_uri_path_item(table_name)
        mydb = db.session.query(models.Database).filter_by(id=database_id).one()
        payload_columns = []
        indexes = []
        primary_key = []
        foreign_keys = []
        try:
            columns = mydb.get_columns(table_name, schema)
            indexes = mydb.get_indexes(table_name, schema)
            primary_key = mydb.get_pk_constraint(table_name, schema)
            foreign_keys = mydb.get_foreign_keys(table_name, schema)
        except Exception as e:
            return json_error_response(utils.error_msg_from_exception(e))
        keys = []
        if primary_key and primary_key.get("constrained_columns"):
            primary_key["column_names"] = primary_key.pop("constrained_columns")
            primary_key["type"] = "pk"
            keys += [primary_key]
        for fk in foreign_keys:
            fk["column_names"] = fk.pop("constrained_columns")
            fk["type"] = "fk"
        keys += foreign_keys
        for idx in indexes:
            idx["type"] = "index"
        keys += indexes

        for col in columns:
            dtype = ""
            try:
                dtype = "{}".format(col["type"])
            except Exception:
                # sqla.types.JSON __str__ has a bug, so using __class__.
                dtype = col["type"].__class__.__name__
                pass
            payload_columns.append(
                {
                    "name": col["name"],
                    "type": dtype.split("(")[0] if "(" in dtype else dtype,
                    "longType": dtype,
                    "keys": [k for k in keys if col["name"] in k.get("column_names")],
                }
            )
        tbl = {
            "name": table_name,
            "columns": payload_columns,
            "selectStar": mydb.select_star(
                table_name,
                schema=schema,
                show_cols=True,
                indent=True,
                cols=columns,
                latest_partition=True,
            ),
            "primaryKey": primary_key,
            "foreignKeys": foreign_keys,
            "indexes": keys,
        }
        return json_success(json.dumps(tbl))

    @has_access
    @expose("/extra_table_metadata/<database_id>/<table_name>/<schema>/")
    @event_logger.log_this
    def extra_table_metadata(self, database_id, table_name, schema):
        schema = utils.parse_js_uri_path_item(schema, eval_undefined=True)
        table_name = utils.parse_js_uri_path_item(table_name)
        mydb = db.session.query(models.Database).filter_by(id=database_id).one()
        payload = mydb.db_engine_spec.extra_table_metadata(mydb, table_name, schema)
        return json_success(json.dumps(payload))

    @has_access
    @expose("/select_star/<database_id>/<table_name>")
    @expose("/select_star/<database_id>/<table_name>/<schema>")
    @event_logger.log_this
    def select_star(self, database_id, table_name, schema=None):
        mydb = db.session.query(models.Database).get(database_id)
        schema = utils.parse_js_uri_path_item(schema, eval_undefined=True)
        table_name = utils.parse_js_uri_path_item(table_name)
        return json_success(
            mydb.select_star(table_name, schema, latest_partition=True, show_cols=True)
        )

    @has_access_api
    @expose("/estimate_query_cost/<database_id>/", methods=["POST"])
    @expose("/estimate_query_cost/<database_id>/<schema>/", methods=["POST"])
    @event_logger.log_this
    def estimate_query_cost(self, database_id: int, schema: str = None) -> Response:
        mydb = db.session.query(models.Database).get(database_id)

        sql = json.loads(request.form.get("sql", '""'))
        template_params = json.loads(request.form.get("templateParams") or "{}")
        if template_params:
            template_processor = get_template_processor(mydb)
            sql = template_processor.process_template(sql, **template_params)

        timeout = SQLLAB_QUERY_COST_ESTIMATE_TIMEOUT
        timeout_msg = f"The estimation exceeded the {timeout} seconds timeout."
        try:
            with utils.timeout(seconds=timeout, error_message=timeout_msg):
                cost = mydb.db_engine_spec.estimate_query_cost(
                    mydb, schema, sql, utils.sources.get("sql_lab")
                )
        except SupersetTimeoutException as e:
            logging.exception(e)
            return json_error_response(timeout_msg)
        except Exception as e:
            return json_error_response(str(e))

        spec = mydb.db_engine_spec
        query_cost_formatters = get_feature_flags().get(
            "QUERY_COST_FORMATTERS_BY_ENGINE", {}
        )
        query_cost_formatter = query_cost_formatters.get(
            spec.engine, spec.query_cost_formatter
        )
        cost = query_cost_formatter(cost)

        return json_success(json.dumps(cost))

    @expose("/theme/")
    def theme(self):
        return self.render_template("superset/theme.html")

    @has_access_api
    @expose("/cached_key/<key>/")
    @event_logger.log_this
    def cached_key(self, key):
        """Returns a key from the cache"""
        resp = cache.get(key)
        if resp:
            return resp
        return "nope"

    @has_access_api
    @expose("/cache_key_exist/<key>/")
    @event_logger.log_this
    def cache_key_exist(self, key):
        """Returns if a key from cache exist"""
        key_exist = True if cache.get(key) else False
        status = 200 if key_exist else 404
        return json_success(json.dumps({"key_exist": key_exist}), status=status)

    @has_access_api
    @expose("/results/<key>/")
    @event_logger.log_this
    def results(self, key):
        return self.results_exec(key)

    def results_exec(self, key: str):
        """Serves a key off of the results backend

        It is possible to pass the `rows` query argument to limit the number
        of rows returned.
        """
        if not results_backend:
            return json_error_response("Results backend isn't configured")

        read_from_results_backend_start = now_as_float()
        blob = results_backend.get(key)
        stats_logger.timing(
            "sqllab.query.results_backend_read",
            now_as_float() - read_from_results_backend_start,
        )
        if not blob:
            return json_error_response(
                "Data could not be retrieved. " "You may want to re-run the query.",
                status=410,
            )

        query = db.session.query(Query).filter_by(results_key=key).one_or_none()
        if query is None:
            return json_error_response(
                "Data could not be retrieved. You may want to re-run the query.",
                status=404,
            )

        rejected_tables = security_manager.rejected_tables(
            query.sql, query.database, query.schema
        )
        if rejected_tables:
            return json_error_response(
                security_manager.get_table_access_error_msg(rejected_tables), status=403
            )

        payload = utils.zlib_decompress(blob, decode=not results_backend_use_msgpack)
        obj: dict = _deserialize_results_payload(
            payload, query, cast(bool, results_backend_use_msgpack)
        )

        if "rows" in request.args:
            try:
                rows = int(request.args["rows"])
            except ValueError:
                return json_error_response("Invalid `rows` argument", status=400)
            obj = apply_display_max_row_limit(obj, rows)

        return json_success(
            json.dumps(obj, default=utils.json_iso_dttm_ser, ignore_nan=True)
        )

    @has_access_api
    @expose("/stop_query/", methods=["POST"])
    @event_logger.log_this
    @backoff.on_exception(
        backoff.constant,
        Exception,
        interval=1,
        on_backoff=lambda details: db.session.rollback(),
        on_giveup=lambda details: db.session.rollback(),
        max_tries=5,
    )
    def stop_query(self):
        client_id = request.form.get("client_id")

        query = db.session.query(Query).filter_by(client_id=client_id).one()
        if query.status in [
            QueryStatus.FAILED,
            QueryStatus.SUCCESS,
            QueryStatus.TIMED_OUT,
        ]:
            logging.error(
                f"Query with client_id {client_id} could not be stopped: query already complete"
            )
            return self.json_response("OK")
        query.status = QueryStatus.STOPPED
        db.session.commit()

        return self.json_response("OK")

    @has_access_api
    @expose("/validate_sql_json/", methods=["POST", "GET"])
    @event_logger.log_this
    def validate_sql_json(self):
        """Validates that arbitrary sql is acceptable for the given database.
        Returns a list of error/warning annotations as json.
        """
        sql = request.form.get("sql")
        database_id = request.form.get("database_id")
        schema = request.form.get("schema") or None
        template_params = json.loads(request.form.get("templateParams") or "{}")

        if len(template_params) > 0:
            # TODO: factor the Database object out of template rendering
            #       or provide it as mydb so we can render template params
            #       without having to also persist a Query ORM object.
            return json_error_response(
                "SQL validation does not support template parameters", status=400
            )

        session = db.session()
        mydb = session.query(models.Database).filter_by(id=database_id).one_or_none()
        if not mydb:
            return json_error_response(
                "Database with id {} is missing.".format(database_id), status=400
            )

        spec = mydb.db_engine_spec
        validators_by_engine = get_feature_flags().get("SQL_VALIDATORS_BY_ENGINE")
        if not validators_by_engine or spec.engine not in validators_by_engine:
            return json_error_response(
                "no SQL validator is configured for {}".format(spec.engine), status=400
            )
        validator_name = validators_by_engine[spec.engine]
        validator = get_validator_by_name(validator_name)
        if not validator:
            return json_error_response(
                "No validator named {} found (configured for the {} engine)".format(
                    validator_name, spec.engine
                )
            )

        try:
            timeout = config["SQLLAB_VALIDATION_TIMEOUT"]
            timeout_msg = f"The query exceeded the {timeout} seconds timeout."
            with utils.timeout(seconds=timeout, error_message=timeout_msg):
                errors = validator.validate(sql, schema, mydb)
            payload = json.dumps(
                [err.to_dict() for err in errors],
                default=utils.pessimistic_json_iso_dttm_ser,
                ignore_nan=True,
                encoding=None,
            )
            return json_success(payload)
        except Exception as e:
            logging.exception(e)
            msg = _(
                f"{validator.name} was unable to check your query.\n"
                "Please recheck your query.\n"
                f"Exception: {e}"
            )
            # Return as a 400 if the database error message says we got a 4xx error
            if re.search(r"([\W]|^)4\d{2}([\W]|$)", str(e)):
                return json_error_response(f"{msg}", status=400)
            else:
                return json_error_response(f"{msg}")

    def _sql_json_async(
        self,
        session: Session,
        rendered_query: str,
        query: Query,
        expand_data: bool,
        log_params: Optional[Dict[str, Any]] = None,
    ) -> str:
        """
            Send SQL JSON query to celery workers

        :param session: SQLAlchemy session object
        :param rendered_query: the rendered query to perform by workers
        :param query: The query (SQLAlchemy) object
        :return: String JSON response
        """
        logging.info(f"Query {query.id}: Running query on a Celery worker")
        # Ignore the celery future object and the request may time out.
        try:
            sql_lab.get_sql_results.delay(
                query.id,
                rendered_query,
                return_results=False,
                store_results=not query.select_as_cta,
                user_name=g.user.username if g.user else None,
                start_time=now_as_float(),
                expand_data=expand_data,
                log_params=log_params,
            )
        except Exception as e:
            logging.exception(f"Query {query.id}: {e}")
            msg = _(
                "Failed to start remote query on a worker. "
                "Tell your administrator to verify the availability of "
                "the message queue."
            )
            query.status = QueryStatus.FAILED
            query.error_message = msg
            session.commit()
            return json_error_response("{}".format(msg))
        resp = json_success(
            json.dumps(
                {"query": query.to_dict()},
                default=utils.json_int_dttm_ser,
                ignore_nan=True,
            ),
            status=202,
        )
        session.commit()
        return resp

    def _sql_json_sync(
        self,
        session: Session,
        rendered_query: str,
        query: Query,
        expand_data: bool,
        log_params: Optional[Dict[str, Any]] = None,
    ) -> str:
        """
            Execute SQL query (sql json)

        :param rendered_query: The rendered query (included templates)
        :param query: The query SQL (SQLAlchemy) object
        :return: String JSON response
        """
        try:
            timeout = config["SQLLAB_TIMEOUT"]
            timeout_msg = f"The query exceeded the {timeout} seconds timeout."
            store_results = (
                is_feature_enabled("SQLLAB_BACKEND_PERSISTENCE")
                and not query.select_as_cta
            )
            with utils.timeout(seconds=timeout, error_message=timeout_msg):
                # pylint: disable=no-value-for-parameter
                data = sql_lab.get_sql_results(
                    query.id,
                    rendered_query,
                    return_results=True,
                    store_results=store_results,
                    user_name=g.user.username if g.user else None,
                    expand_data=expand_data,
                    log_params=log_params,
                )

            payload = json.dumps(
                apply_display_max_row_limit(data),
                default=utils.pessimistic_json_iso_dttm_ser,
                ignore_nan=True,
                encoding=None,
            )
        except Exception as e:
            logging.exception(f"Query {query.id}: {e}")
            return json_error_response(f"{{e}}")
        if data.get("status") == QueryStatus.FAILED:
            return json_error_response(payload=data)
        return json_success(payload)

    @has_access_api
    @expose("/sql_json/", methods=["POST"])
    @event_logger.log_this
    def sql_json(self):
        log_params = {
            "user_agent": cast(Optional[str], request.headers.get("USER_AGENT"))
        }
        return self.sql_json_exec(request.json, log_params)

    def sql_json_exec(
        self, query_params: dict, log_params: Optional[Dict[str, Any]] = None
    ):
        """Runs arbitrary sql and returns data as json"""
        # Collect Values
        database_id: int = cast(int, query_params.get("database_id"))
        schema: str = cast(str, query_params.get("schema"))
        sql: str = cast(str, query_params.get("sql"))
        try:
            template_params: dict = json.loads(
                query_params.get("templateParams") or "{}"
            )
        except json.JSONDecodeError:
            logging.warning(
                f"Invalid template parameter {query_params.get('templateParams')}"
                " specified. Defaulting to empty dict"
            )
            template_params = {}
        limit: int = query_params.get("queryLimit") or app.config["SQL_MAX_ROW"]
        async_flag: bool = cast(bool, query_params.get("runAsync"))
        if limit < 0:
            logging.warning(
                f"Invalid limit of {limit} specified. Defaulting to max limit."
            )
            limit = 0
        select_as_cta: bool = cast(bool, query_params.get("select_as_cta"))
        tmp_table_name: str = cast(str, query_params.get("tmp_table_name"))
        client_id: str = cast(
            str, query_params.get("client_id") or utils.shortid()[:10]
        )
        sql_editor_id: str = cast(str, query_params.get("sql_editor_id"))
        tab_name: str = cast(str, query_params.get("tab"))
        status: str = QueryStatus.PENDING if async_flag else QueryStatus.RUNNING

        session = db.session()
        mydb = session.query(models.Database).get(database_id)
        if not mydb:
            return json_error_response(f"Database with id {database_id} is missing.")

        # Set tmp_table_name for CTA
        if select_as_cta and mydb.force_ctas_schema:
            tmp_table_name = f"{mydb.force_ctas_schema}.{tmp_table_name}"

        # Save current query
        query = Query(
            database_id=database_id,
            sql=sql,
            schema=schema,
            select_as_cta=select_as_cta,
            start_time=now_as_float(),
            tab_name=tab_name,
            status=status,
            sql_editor_id=sql_editor_id,
            tmp_table_name=tmp_table_name,
            user_id=g.user.get_id() if g.user else None,
            client_id=client_id,
        )
        try:
            session.add(query)
            session.flush()
            query_id = query.id
            session.commit()  # shouldn't be necessary
        except SQLAlchemyError as e:
            logging.error(f"Errors saving query details {e}")
            session.rollback()
            raise Exception(_("Query record was not created as expected."))
        if not query_id:
            raise Exception(_("Query record was not created as expected."))

        logging.info(f"Triggering query_id: {query_id}")

        rejected_tables = security_manager.rejected_tables(sql, mydb, schema)
        if rejected_tables:
            query.status = QueryStatus.FAILED
            session.commit()
            return json_error_response(
                security_manager.get_table_access_error_msg(rejected_tables),
                link=security_manager.get_table_access_link(rejected_tables),
                status=403,
            )

        try:
            template_processor = get_template_processor(
                database=query.database, query=query
            )
            rendered_query = template_processor.process_template(
                query.sql, **template_params
            )
        except Exception as e:
            error_msg = utils.error_msg_from_exception(e)
            return json_error_response(
                f"Query {query_id}: Template rendering failed: {error_msg}"
            )

        # set LIMIT after template processing
        limits = [mydb.db_engine_spec.get_limit_from_sql(rendered_query), limit]
        query.limit = min(lim for lim in limits if lim is not None)

        # Flag for whether or not to expand data
        # (feature that will expand Presto row objects and arrays)
        expand_data: bool = cast(
            bool,
            is_feature_enabled("PRESTO_EXPAND_DATA")
            and query_params.get("expand_data"),
        )

        # Async request.
        if async_flag:
            return self._sql_json_async(
                session, rendered_query, query, expand_data, log_params
            )
        # Sync request.
        return self._sql_json_sync(
            session, rendered_query, query, expand_data, log_params
        )

    @has_access
    @expose("/csv/<client_id>")
    @event_logger.log_this
    def csv(self, client_id):
        """Download the query results as csv."""
        logging.info("Exporting CSV file [{}]".format(client_id))
        query = db.session.query(Query).filter_by(client_id=client_id).one()

        rejected_tables = security_manager.rejected_tables(
            query.sql, query.database, query.schema
        )
        if rejected_tables:
            flash(security_manager.get_table_access_error_msg(rejected_tables))
            return redirect("/")
        blob = None
        if results_backend and query.results_key:
            logging.info(
                "Fetching CSV from results backend " "[{}]".format(query.results_key)
            )
            blob = results_backend.get(query.results_key)
        if blob:
            logging.info("Decompressing")
            payload = utils.zlib_decompress(
                blob, decode=not results_backend_use_msgpack
            )
            obj = _deserialize_results_payload(
                payload, query, results_backend_use_msgpack
            )
            columns = [c["name"] for c in obj["columns"]]
            df = pd.DataFrame.from_records(obj["data"], columns=columns)
            logging.info("Using pandas to convert to CSV")
            csv = df.to_csv(index=False, **config["CSV_EXPORT"])
        else:
            logging.info("Running a query to turn into CSV")
            sql = query.select_sql or query.executed_sql
            df = query.database.get_df(sql, query.schema)
            # TODO(bkyryliuk): add compression=gzip for big files.
            csv = df.to_csv(index=False, **config["CSV_EXPORT"])
        response = Response(csv, mimetype="text/csv")
        response.headers[
            "Content-Disposition"
        ] = f"attachment; filename={query.name}.csv"
        event_info = {
            "event_type": "data_export",
            "client_id": client_id,
            "row_count": len(df.index),
            "database": query.database.name,
            "schema": query.schema,
            "sql": query.sql,
            "exported_format": "csv",
        }
        logging.info(
            f"CSV exported: {repr(event_info)}", extra={"superset_event": event_info}
        )
        return response

    @api
    @handle_api_exception
    @has_access
    @expose("/fetch_datasource_metadata")
    @event_logger.log_this
    def fetch_datasource_metadata(self):
        datasource_id, datasource_type = request.args.get("datasourceKey").split("__")
        datasource = ConnectorRegistry.get_datasource(
            datasource_type, datasource_id, db.session
        )
        # Check if datasource exists
        if not datasource:
            return json_error_response(DATASOURCE_MISSING_ERR)

        # Check permission for datasource
        security_manager.assert_datasource_permission(datasource)
        return json_success(json.dumps(datasource.data))

    @has_access_api
    @expose("/queries/<last_updated_ms>")
    def queries(self, last_updated_ms):
        """
        Get the updated queries.

        :param last_updated_ms: unix time, milliseconds
        """
        last_updated_ms_int = int(float(last_updated_ms)) if last_updated_ms else 0
        return self.queries_exec(last_updated_ms_int)

    def queries_exec(self, last_updated_ms_int: int):
        stats_logger.incr("queries")
        if not g.user.get_id():
            return json_error_response(
                "Please login to access the queries.", status=403
            )

        # UTC date time, same that is stored in the DB.
        last_updated_dt = utils.EPOCH + timedelta(seconds=last_updated_ms_int / 1000)

        sql_queries = (
            db.session.query(Query)
            .filter(
                Query.user_id == g.user.get_id(), Query.changed_on >= last_updated_dt
            )
            .all()
        )
        dict_queries = {q.client_id: q.to_dict() for q in sql_queries}
        return json_success(json.dumps(dict_queries, default=utils.json_int_dttm_ser))

    @has_access
    @expose("/search_queries")
    @event_logger.log_this
    def search_queries(self) -> Response:
        """
        Search for previously run sqllab queries. Used for Sqllab Query Search
        page /superset/sqllab#search.

        Custom permission can_only_search_queries_owned restricts queries
        to only queries run by current user.

        :returns: Response with list of sql query dicts
        """
        query = db.session.query(Query)
        if security_manager.can_only_access_owned_queries():
            search_user_id = g.user.get_user_id()
        else:
            search_user_id = request.args.get("user_id")
        database_id = request.args.get("database_id")
        search_text = request.args.get("search_text")
        status = request.args.get("status")
        # From and To time stamp should be Epoch timestamp in seconds
        from_time = request.args.get("from")
        to_time = request.args.get("to")

        if search_user_id:
            # Filter on user_id
            query = query.filter(Query.user_id == search_user_id)

        if database_id:
            # Filter on db Id
            query = query.filter(Query.database_id == database_id)

        if status:
            # Filter on status
            query = query.filter(Query.status == status)

        if search_text:
            # Filter on search text
            query = query.filter(Query.sql.like("%{}%".format(search_text)))

        if from_time:
            query = query.filter(Query.start_time > int(from_time))

        if to_time:
            query = query.filter(Query.start_time < int(to_time))

        query_limit = config["QUERY_SEARCH_LIMIT"]
        sql_queries = query.order_by(Query.start_time.asc()).limit(query_limit).all()

        dict_queries = [q.to_dict() for q in sql_queries]

        return Response(
            json.dumps(dict_queries, default=utils.json_int_dttm_ser),
            status=200,
            mimetype="application/json",
        )

    @app.errorhandler(500)
    def show_traceback(self):
        return (
            render_template("superset/traceback.html", error_msg=get_error_msg()),
            500,
        )

    @expose("/welcome")
    def welcome(self):
        """Personalized welcome page"""
        if not g.user or not g.user.get_id():
            return redirect(appbuilder.get_url_for_login)

        welcome_dashboard_id = (
            db.session.query(UserAttribute.welcome_dashboard_id)
            .filter_by(user_id=g.user.get_id())
            .scalar()
        )
        if welcome_dashboard_id:
            return self.dashboard(str(welcome_dashboard_id))

        payload = {
            "user": bootstrap_user_data(g.user),
            "common": common_bootstrap_payload(),
        }

        return self.render_template(
            "superset/welcome.html",
            entry="welcome",
            bootstrap_data=json.dumps(
                payload, default=utils.pessimistic_json_iso_dttm_ser
            ),
        )

    @has_access
    @expose("/profile/<username>/")
    def profile(self, username):
        """User profile page"""
        if not username and g.user:
            username = g.user.username

        user = (
            db.session.query(ab_models.User).filter_by(username=username).one_or_none()
        )
        if not user:
            abort(404, description=f"User: {username} does not exist.")

        payload = {
            "user": bootstrap_user_data(user, include_perms=True),
            "common": common_bootstrap_payload(),
        }

        return self.render_template(
            "superset/basic.html",
            title=_("%(user)s's profile", user=username),
            entry="profile",
            bootstrap_data=json.dumps(
                payload, default=utils.pessimistic_json_iso_dttm_ser
            ),
        )

    @staticmethod
    def _get_sqllab_payload(user_id: int) -> Dict[str, Any]:
        # send list of tab state ids
        tabs_state = (
            db.session.query(TabState.id, TabState.label)
            .filter_by(user_id=user_id)
            .all()
        )
        tab_state_ids = [tab_state[0] for tab_state in tabs_state]
        # return first active tab, or fallback to another one if no tab is active
        active_tab = (
            db.session.query(TabState)
            .filter_by(user_id=user_id)
            .order_by(TabState.active.desc())
            .first()
        )

        databases: Dict[int, Any] = {}
        queries: Dict[str, Any] = {}

        # These are unnecessary if sqllab backend persistence is disabled
        if is_feature_enabled("SQLLAB_BACKEND_PERSISTENCE"):
            databases = {
                database.id: {
                    k: v for k, v in database.to_json().items() if k in DATABASE_KEYS
                }
                for database in db.session.query(models.Database).all()
            }
            # return all user queries associated with existing SQL editors
            user_queries = (
                db.session.query(Query)
                .filter_by(user_id=user_id)
                .filter(Query.sql_editor_id.cast(Integer).in_(tab_state_ids))
                .all()
            )
            queries = {
                query.client_id: {k: v for k, v in query.to_dict().items()}
                for query in user_queries
            }

        return {
            "defaultDbId": config["SQLLAB_DEFAULT_DBID"],
            "common": common_bootstrap_payload(),
            "tab_state_ids": tabs_state,
            "active_tab": active_tab.to_dict() if active_tab else None,
            "databases": databases,
            "queries": queries,
        }

    @has_access
    @expose("/sqllab")
    def sqllab(self):
        """SQL Editor"""
        payload = self._get_sqllab_payload(g.user.get_id())
        bootstrap_data = json.dumps(
            payload, default=utils.pessimistic_json_iso_dttm_ser
        )

        return self.render_template(
            "superset/basic.html", entry="sqllab", bootstrap_data=bootstrap_data
        )

    @api
    @handle_api_exception
    @has_access_api
    @expose("/slice_query/<slice_id>/")
    def slice_query(self, slice_id):
        """
        This method exposes an API endpoint to
        get the database query string for this slice
        """
        viz_obj = get_viz(slice_id)
        security_manager.assert_viz_permission(viz_obj)
        return self.get_query_string_response(viz_obj)

    @api
    @has_access_api
    @expose("/schemas_access_for_csv_upload")
    def schemas_access_for_csv_upload(self):
        """
        This method exposes an API endpoint to
        get the schema access control settings for csv upload in this database
        """
        if not request.args.get("db_id"):
            return json_error_response("No database is allowed for your csv upload")

        db_id = int(request.args.get("db_id"))
        database = db.session.query(models.Database).filter_by(id=db_id).one()
        try:
            schemas_allowed = database.get_schema_access_for_csv_upload()
            if (
                security_manager.database_access(database)
                or security_manager.all_datasource_access()
            ):
                return self.json_response(schemas_allowed)
            # the list schemas_allowed should not be empty here
            # and the list schemas_allowed_processed returned from security_manager
            # should not be empty either,
            # otherwise the database should have been filtered out
            # in CsvToDatabaseForm
            schemas_allowed_processed = security_manager.schemas_accessible_by_user(
                database, schemas_allowed, False
            )
            return self.json_response(schemas_allowed_processed)
        except Exception:
            return json_error_response(
                "Failed to fetch schemas allowed for csv upload in this database! "
                "Please contact your Superset Admin!",
                stacktrace=utils.get_stacktrace(),
            )


class CssTemplateModelView(SupersetModelView, DeleteMixin):
    datamodel = SQLAInterface(models.CssTemplate)
    include_route_methods = RouteMethod.CRUD_SET

    list_title = _("CSS Templates")
    show_title = _("Show CSS Template")
    add_title = _("Add CSS Template")
    edit_title = _("Edit CSS Template")

    list_columns = ["template_name"]
    edit_columns = ["template_name", "css"]
    add_columns = edit_columns
    label_columns = {"template_name": _("Template Name")}


class CssTemplateAsyncModelView(CssTemplateModelView):
    include_route_methods = {RouteMethod.API_READ}
    list_columns = ["template_name", "css"]


@app.after_request
def apply_http_headers(response: Response):
    """Applies the configuration's http headers to all responses"""

    # HTTP_HEADERS is deprecated, this provides backwards compatibility
    response.headers.extend(
        {**config["OVERRIDE_HTTP_HEADERS"], **config["HTTP_HEADERS"]}
    )

    for k, v in config["DEFAULT_HTTP_HEADERS"].items():
        if k not in response.headers:
            response.headers[k] = v
    return response
