Merge changes from oauth branch

Change-Id: If0b55a97ba164358b01cf4a8d3b1fad623e0dcff

.gitignore

@@ -1,5 +1,4 @@
 /.classpath
-/.primary_build_tool
 /.project
 /.settings/org.maven.ide.eclipse.prefs
 /.settings/org.eclipse.m2e.core.prefs

BUILD

@@ -15,4 +15,4 @@ gerrit_plugin(
         "@commons_codec//jar:neverlink",
         "@scribe//jar",
     ],
-)
+)

README.md

@@ -9,7 +9,9 @@ Supported OAuth providers:
 
 * [Bitbucket](https://confluence.atlassian.com/bitbucket/oauth-on-bitbucket-cloud-238027431.html)
 * [CAS](https://www.apereo.org/projects/cas)
+* [Facebook](https://developers.facebook.com/docs/facebook-login)
 * [GitHub](https://developer.github.com/v3/oauth/)
+* [GitLab](https://about.gitlab.com/)
 * [Google](https://developers.google.com/identity/protocols/OAuth2)
 
 See the [Wiki](https://github.com/davido/gerrit-oauth-provider/wiki) what it can do for you.
@@ -27,8 +29,7 @@ The plugin can be bulit with Bazel. To build the plugin install
 following:
 
 ```
-  git clone https://github.com/davido/gerrit-oauth-provider.git
-  cd gerrit-oauth-provider && bazel build :all
+bazel build gerrit-oauth-provider
 ```
 
 Install

src/main/java/com/googlesource/gerrit/plugins/oauth/DisabledOAuthLoginProvider.java

@@ -0,0 +1,39 @@
+// Copyright (C) 2017 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.oauth;
+
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.extensions.auth.oauth.OAuthLoginProvider;
+import com.google.gerrit.extensions.auth.oauth.OAuthUserInfo;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.IOException;
+
+@Singleton
+class DisabledOAuthLoginProvider implements OAuthLoginProvider {
+  private final String pluginName;
+
+  @Inject
+  DisabledOAuthLoginProvider(@PluginName String pluginName) {
+    this.pluginName = pluginName;
+  }
+
+  @Override
+  public OAuthUserInfo login(String username, String secret)
+      throws IOException {
+    throw new UnsupportedOperationException(
+        "git over oauth is not implemented by " + pluginName + " plugin");
+  }
+}

src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java

@@ -0,0 +1,148 @@
+// Copyright (C) 2017 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.oauth;
+
+import com.google.common.base.CharMatcher;
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
+import com.google.gerrit.extensions.auth.oauth.OAuthToken;
+import com.google.gerrit.extensions.auth.oauth.OAuthUserInfo;
+import com.google.gerrit.extensions.auth.oauth.OAuthVerifier;
+import com.google.gerrit.server.OutputFormat;
+import com.google.gerrit.server.config.CanonicalWebUrl;
+import com.google.gerrit.server.config.PluginConfig;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+
+import org.scribe.builder.ServiceBuilder;
+import org.scribe.builder.api.FacebookApi;
+import org.scribe.model.OAuthRequest;
+import org.scribe.model.Response;
+import org.scribe.model.Token;
+import org.scribe.model.Verb;
+import org.scribe.model.Verifier;
+import org.scribe.oauth.OAuthService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+import javax.servlet.http.HttpServletResponse;
+
+@Singleton
+class FacebookOAuthService implements OAuthServiceProvider {
+  private static final Logger log = LoggerFactory
+      .getLogger(FacebookOAuthService.class);
+  static final String CONFIG_SUFFIX = "-facebook-oauth";
+  private static final String PROTECTED_RESOURCE_URL =
+      "https://graph.facebook.com/me";
+
+  private static final String FACEBOOK_PROVIDER_PREFIX = "facebook-oauth:";
+  private static final String SCOPE = "email";
+  private static final String FIELDS_QUERY = "fields";
+  private static final String FIELDS = "email,name";
+  private final OAuthService service;
+
+  @Inject
+  FacebookOAuthService(PluginConfigFactory cfgFactory,
+      @PluginName String pluginName,
+      @CanonicalWebUrl Provider<String> urlProvider) {
+
+    PluginConfig cfg = cfgFactory.getFromGerritConfig(pluginName
+        + CONFIG_SUFFIX);
+    String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(
+        urlProvider.get())
+        + "/";
+
+    service = new ServiceBuilder().provider(FacebookApi.class)
+        .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
+        .callback(canonicalWebUrl + "oauth")
+        .scope(SCOPE)
+        .build();
+  }
+
+  @Override
+  public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
+    OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
+    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    request.addQuerystringParameter(FIELDS_QUERY, FIELDS);
+    service.signRequest(t, request);
+    Response response = request.send();
+
+    if (response.getCode() != HttpServletResponse.SC_OK) {
+      throw new IOException(String.format("Status %s (%s) for request %s",
+          response.getCode(), response.getBody(), request.getUrl()));
+    }
+    JsonElement userJson = OutputFormat.JSON.newGson().fromJson(
+        response.getBody(), JsonElement.class);
+
+    if (log.isDebugEnabled()) {
+      log.debug("User info response: {}", response.getBody());
+    }
+    if (userJson.isJsonObject()) {
+      JsonObject jsonObject = userJson.getAsJsonObject();
+      JsonElement id = jsonObject.get("id");
+      if (id == null || id.isJsonNull()) {
+        throw new IOException(
+            String.format("Response doesn't contain id field"));
+      }
+      JsonElement email = jsonObject.get("email");
+      JsonElement name = jsonObject.get("name");
+      // Heads up!
+      // Lets keep `login` equal to `email`, since `username` field is
+      // deprecated for Facebook API versions v2.0 and higher
+      JsonElement login = jsonObject.get("email");
+
+      return new OAuthUserInfo(FACEBOOK_PROVIDER_PREFIX + id.getAsString(),
+          login == null || login.isJsonNull() ? null : login.getAsString(),
+          email == null || email.isJsonNull() ? null : email.getAsString(),
+          name == null || name.isJsonNull() ? null : name.getAsString(),
+          null);
+    }
+
+    throw new IOException(String.format("Invalid JSON '%s': not a JSON Object",
+        userJson));
+  }
+
+  @Override
+  public OAuthToken getAccessToken(OAuthVerifier rv) {
+    Verifier vi = new Verifier(rv.getValue());
+    Token to = service.getAccessToken(null, vi);
+    OAuthToken result = new OAuthToken(to.getToken(), to.getSecret(),
+        to.getRawResponse());
+
+    return result;
+  }
+
+  @Override
+  public String getAuthorizationUrl() {
+    return service.getAuthorizationUrl(null);
+  }
+
+  @Override
+  public String getVersion() {
+    return service.getVersion();
+  }
+
+  @Override
+  public String getName() {
+    return "Facebook OAuth2";
+  }
+}

src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabApi.java

@@ -0,0 +1,161 @@
+// Copyright (C) 2017 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.oauth;
+
+import org.scribe.builder.api.DefaultApi20;
+import org.scribe.exceptions.OAuthException;
+import org.scribe.extractors.AccessTokenExtractor;
+import org.scribe.model.*;
+import org.scribe.oauth.OAuthService;
+
+import org.scribe.utils.Preconditions;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static java.lang.String.format;
+
+public class GitLabApi extends DefaultApi20 {
+  private static final String AUTHORIZE_URL =
+      "%s/oauth/authorize?client_id=%s&response_type=code&redirect_uri=%s";
+
+  private final String rootUrl;
+
+  public GitLabApi(String rootUrl) {
+    this.rootUrl = rootUrl;
+  }
+
+  @Override
+  public String getAuthorizationUrl(OAuthConfig config) {
+    return String.format(AUTHORIZE_URL, rootUrl, config.getApiKey(),
+        config.getCallback());
+  }
+
+  @Override
+  public String getAccessTokenEndpoint() {
+    return String.format("%s/oauth/token", rootUrl);
+  }
+
+  @Override
+  public Verb getAccessTokenVerb() {
+    return Verb.POST;
+  }
+
+  @Override
+  public OAuthService createService(OAuthConfig config) {
+    return new GitLabOAuthService(this, config);
+  }
+
+  @Override
+  public AccessTokenExtractor getAccessTokenExtractor() {
+    return new GitLabJsonTokenExtractor();
+  }
+
+  private static final class GitLabOAuthService implements OAuthService {
+    private static final String VERSION = "2.0";
+
+    private static final String GRANT_TYPE = "grant_type";
+    private static final String GRANT_TYPE_VALUE = "authorization_code";
+
+    private final DefaultApi20 api;
+    private final OAuthConfig config;
+
+    /**
+     * Default constructor
+     *
+     * @param api    OAuth2.0 api information
+     * @param config OAuth 2.0 configuration param object
+     */
+    public GitLabOAuthService(DefaultApi20 api, OAuthConfig config) {
+      this.api = api;
+      this.config = config;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public Token getAccessToken(Token requestToken, Verifier verifier) {
+      OAuthRequest request =
+          new OAuthRequest(api.getAccessTokenVerb(),
+              api.getAccessTokenEndpoint());
+      request.addBodyParameter(OAuthConstants.CLIENT_ID, config.getApiKey());
+      request.addBodyParameter(OAuthConstants.CLIENT_SECRET,
+          config.getApiSecret());
+      request.addBodyParameter(OAuthConstants.CODE, verifier.getValue());
+      request.addBodyParameter(OAuthConstants.REDIRECT_URI,
+          config.getCallback());
+      if (config.hasScope()) {
+        request.addBodyParameter(OAuthConstants.SCOPE, config.getScope());
+      }
+      request.addBodyParameter(GRANT_TYPE, GRANT_TYPE_VALUE);
+      Response response = request.send();
+      return api.getAccessTokenExtractor().extract(response.getBody());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public Token getRequestToken() {
+      throw new UnsupportedOperationException(
+          "Unsupported operation, please use 'getAuthorizationUrl' and redirect your users there");
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String getVersion() {
+      return VERSION;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void signRequest(Token accessToken, OAuthRequest request) {
+      request.addQuerystringParameter(OAuthConstants.ACCESS_TOKEN,
+          accessToken.getToken());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String getAuthorizationUrl(Token requestToken) {
+      return api.getAuthorizationUrl(config);
+    }
+  }
+
+  private static final class GitLabJsonTokenExtractor implements
+      AccessTokenExtractor {
+    private Pattern accessTokenPattern = Pattern
+        .compile("\"access_token\"\\s*:\\s*\"(\\S*?)\"");
+
+    @Override
+    public Token extract(String response) {
+      Preconditions.checkEmptyString(response,
+          "Cannot extract a token from a null or empty String");
+      Matcher matcher = accessTokenPattern.matcher(response);
+      if (matcher.find()) {
+        return new Token(matcher.group(1), "", response);
+      } else {
+        throw new OAuthException(
+            "Cannot extract an acces token. Response was: " + response);
+      }
+    }
+  }
+}