github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/GitHubOAuthConfig.java

// Copyright (C) 2013 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.github.oauth;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jgit.lib.Config;

import com.google.common.base.Objects;
import com.google.common.base.Strings;
import com.google.gerrit.reviewdb.client.AuthType;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.googlesource.gerrit.plugins.github.oauth.OAuthProtocol.Scope;

@Singleton
public class GitHubOAuthConfig {
  protected static final String CONF_SECTION = "github";
  private static final String LOGIN_OAUTH_AUTHORIZE = "/login/oauth/authorize";
  private static final String GITHUB_URL = "https://github.com";
  public static final String OAUTH_FINAL = "/oauth";
  public static final String LOGIN_OAUTH_ACCESS_TOKEN =
      "/login/oauth/access_token";
  public static final String OAUTH_LOGIN = "/login";
  public static final String OAUTH_LOGOUT = "/logout";

  public final String gitHubUrl;
  public final String gitHubClientId;
  public final String gitHubClientSecret;
  public final String logoutRedirectUrl;
  public final String httpHeader;
  public final String httpDisplaynameHeader;
  public final String httpEmailHeader;
  public final String gitHubOAuthUrl;
  public final String oAuthFinalRedirectUrl;
  public final String gitHubOAuthAccessTokenUrl;
  public final boolean enabled;
  public final List<OAuthProtocol.Scope> scopes;

  @Inject
  public GitHubOAuthConfig(@GerritServerConfig Config config)
      throws MalformedURLException {
    httpHeader = config.getString("auth", null, "httpHeader");
    httpDisplaynameHeader = config.getString("auth", null, "httpDisplaynameHeader");
    httpEmailHeader = config.getString("auth", null, "httpEmailHeader");
    gitHubUrl = dropTrailingSlash(
        Objects.firstNonNull(config.getString(CONF_SECTION, null, "url"),
            GITHUB_URL));
    gitHubClientId = config.getString(CONF_SECTION, null, "clientId");
    gitHubClientSecret = config.getString(CONF_SECTION, null, "clientSecret");
    gitHubOAuthUrl = getUrl(gitHubUrl, LOGIN_OAUTH_AUTHORIZE);
    gitHubOAuthAccessTokenUrl = getUrl(gitHubUrl, LOGIN_OAUTH_ACCESS_TOKEN);
    logoutRedirectUrl = config.getString(CONF_SECTION, null, "logoutRedirectUrl");
    oAuthFinalRedirectUrl =
        getUrl(config.getString("gerrit", null, "canonicalWebUrl"), OAUTH_FINAL);

    enabled =
        config.getString("auth", null, "type").equalsIgnoreCase(
            AuthType.HTTP.toString());
    scopes = parseScopes(config.getString(CONF_SECTION, null, "scopes"));
  }

  private String dropTrailingSlash(String url) {
    return (url.endsWith("/") ? url.substring(0, url.length()-1):url);
  }

  private List<Scope> parseScopes(String scopesString) {
    ArrayList<Scope> scopes = new ArrayList<OAuthProtocol.Scope>();
    if(Strings.emptyToNull(scopesString) != null) {
      String[] scopesStrings = scopesString.split(",");
      for (String scope : scopesStrings) {
        scopes.add(Enum.valueOf(Scope.class, scope));
      }
    }
    
    return scopes;
  }

  public String getUrl(String baseUrl, String path)
      throws MalformedURLException {
    if (baseUrl.indexOf("://") > 0) {
      return new URL(new URL(baseUrl), path).toExternalForm();
    } else {
      return baseUrl + (baseUrl.endsWith("/") ? "" : "/")
          + (path.startsWith("/") ? path.substring(1) : path);
    }
  }
}