// Copyright (C) 2015 The Android Open Source Project
//
// Licensed 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.
package com.googlesource.gerrit.plugins.serviceuser;

import static com.google.gerrit.server.permissions.GlobalPermission.ADMINISTRATE_SERVER;

import com.google.common.base.Strings;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.config.ConfigResource;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.googlesource.gerrit.plugins.serviceuser.PutHttpPassword.Input;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import org.apache.commons.codec.binary.Base64;
import org.eclipse.jgit.errors.ConfigInvalidException;

@Singleton
public class PutHttpPassword implements RestModifyView<ServiceUserResource, Input> {
  public static class Input {
    public String httpPassword;
    public boolean generate;
  }

  private static final int LEN = 31;
  private static final SecureRandom rng;

  static {
    try {
      rng = SecureRandom.getInstance("SHA1PRNG");
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException("Cannot create RNG for password generator", e);
    }
  }

  private final Provider<GetConfig> getConfig;
  private final com.google.gerrit.server.restapi.account.PutHttpPassword putHttpPassword;
  private final Provider<CurrentUser> self;
  private final PermissionBackend permissionBackend;

  @Inject
  PutHttpPassword(
      Provider<GetConfig> getConfig,
      com.google.gerrit.server.restapi.account.PutHttpPassword putHttpPassword,
      Provider<CurrentUser> self,
      PermissionBackend permissionBackend) {
    this.getConfig = getConfig;
    this.putHttpPassword = putHttpPassword;
    this.self = self;
    this.permissionBackend = permissionBackend;
  }

  @Override
  public Response<String> apply(ServiceUserResource rsrc, Input input)
      throws AuthException, ResourceConflictException, ConfigInvalidException,
          ResourceNotFoundException, OrmException, IOException, PermissionBackendException {
    if (input == null) {
      input = new Input();
    }
    input.httpPassword = Strings.emptyToNull(input.httpPassword);

    Boolean httpPasswordAllowed = getConfig.get().apply(new ConfigResource()).allowHttpPassword;
    if (input.generate || input.httpPassword == null) {
      if ((httpPasswordAllowed == null || !httpPasswordAllowed)) {
        permissionBackend.user(self.get()).check(ADMINISTRATE_SERVER);
      }
    } else {
      permissionBackend.user(self.get()).check(ADMINISTRATE_SERVER);
    }

    String newPassword = input.generate ? generate() : input.httpPassword;
    return putHttpPassword.apply(rsrc.getUser(), newPassword);
  }

  private static String generate() {
    byte[] rand = new byte[LEN];
    rng.nextBytes(rand);

    byte[] enc = Base64.encodeBase64(rand, false);
    StringBuilder r = new StringBuilder(enc.length);
    for (int i = 0; i < enc.length; i++) {
      if (enc[i] == '=') {
        break;
      }
      r.append((char) enc[i]);
    }
    return r.toString();
  }
}

@@ -743,16 +743,97 @@
 _SERVER;
+%0Aimport static com.google.gerrit.server.restapi.account.PutHttpPassword.generate;
 %0A%0Aimport
@@ -1671,137 +1671,8 @@
 on;%0A
-import java.security.NoSuchAlgorithmException;%0Aimport java.security.SecureRandom;%0Aimport org.apache.commons.codec.binary.Base64;%0A
 impo
@@ -1919,293 +1919,8 @@
  %7D%0A%0A
-  private static final int LEN = 31;%0A  private static final SecureRandom rng;%0A%0A  static %7B%0A    try %7B%0A      rng = SecureRandom.getInstance(%22SHA1PRNG%22);%0A    %7D catch (NoSuchAlgorithmException e) %7B%0A      throw new RuntimeException(%22Cannot create RNG for password generator%22, e);%0A    %7D%0A  %7D%0A%0A
   pr
@@ -3365,24 +3365,24 @@
 tpPassword;%0A
+
     return p
@@ -3439,367 +3439,7 @@
 %0A  %7D
-%0A%0A  private static String generate() %7B%0A    byte%5B%5D rand = new byte%5BLEN%5D;%0A    rng.nextBytes(rand);%0A%0A    byte%5B%5D enc = Base64.encodeBase64(rand, false);%0A    StringBuilder r = new StringBuilder(enc.length);%0A    for (int i = 0; i %3C enc.length; i++) %7B%0A      if (enc%5Bi%5D == '=') %7B%0A        break;%0A      %7D%0A      r.append((char) enc%5Bi%5D);%0A    %7D%0A    return r.toString();%0A  %7D
 %0A%7D%0A

Use core to generate password and drop dependency on commons-codec