Add OAuth2 revocation fetcher that is right now used for notifications.

chrome/common/net/gaia/oauth2_revocation_fetcher.cc

Index: chrome/common/net/gaia/oauth2_revocation_fetcher.cc
===================================================================
--- chrome/common/net/gaia/oauth2_revocation_fetcher.cc	(revision 0)
+++ chrome/common/net/gaia/oauth2_revocation_fetcher.cc	(revision 0)
@@ -0,0 +1,163 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/common/net/gaia/oauth2_revocation_fetcher.h"
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include "base/json/json_reader.h"
+#include "base/string_util.h"
+#include "base/stringprintf.h"
+#include "base/values.h"
+#include "chrome/common/net/gaia/gaia_urls.h"
+#include "chrome/common/net/gaia/google_service_auth_error.h"
+#include "chrome/common/net/http_return.h"
+#include "net/base/escape.h"
+#include "net/base/load_flags.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/url_request/url_request_status.h"
+
+using content::URLFetcher;
+using content::URLFetcherDelegate;
+using net::ResponseCookies;
+using net::URLRequestContextGetter;
+using net::URLRequestStatus;
+
+namespace {
+static const char kOAuth2RevokeTokenURL[] =
+    "https://www.googleapis.com/oauth2/v2/RevokeToken";
+
+static const char kAuthorizationHeaderFormat[] =
+    "Authorization: Bearer %s";
+
+static const char kRevocationBodyFormat[] =
+    "client_id=%s&origin=%s";
+
+static GoogleServiceAuthError CreateAuthError(URLRequestStatus status) {
+  CHECK(!status.is_success());
+  if (status.status() == URLRequestStatus::CANCELED) {
+    return GoogleServiceAuthError(GoogleServiceAuthError::REQUEST_CANCELED);
+  } else {
+    DLOG(WARNING) << "Could not reach Google Accounts servers: errno "
+                  << status.error();
+    return GoogleServiceAuthError::FromConnectionError(status.error());
+  }
+}
+
+static URLFetcher* CreateFetcher(URLRequestContextGetter* getter,
+                                 const GURL& url,
+                                 const std::string& header,
+                                 const std::string& body,
+                                 URLFetcherDelegate* delegate) {
+  bool empty_body = body.empty();
+  URLFetcher* result = URLFetcher::Create(
+      0, url,
+      empty_body ? URLFetcher::GET : URLFetcher::POST,
+      delegate);
+
+  result->SetRequestContext(getter);
+  result->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
+                       net::LOAD_DO_NOT_SAVE_COOKIES);
+  if (!header.empty())
+    result->SetExtraRequestHeaders(header);
+
+  if (!empty_body)
+    result->SetUploadData("application/x-www-form-urlencoded", body);
+
+  return result;
+}
+}  // namespace
+
+OAuth2RevocationFetcher::OAuth2RevocationFetcher(
+    OAuth2RevocationConsumer* consumer,
+    URLRequestContextGetter* getter)
+    : consumer_(consumer),
+      getter_(getter),
+      state_(INITIAL) { }
+
+OAuth2RevocationFetcher::~OAuth2RevocationFetcher() { }
+
+void OAuth2RevocationFetcher::CancelRequest() {
+  fetcher_.reset();
+}
+
+void OAuth2RevocationFetcher::Start(const std::string& access_token,
+                                    const std::string& client_id,
+                                    const std::string& origin) {
+  access_token_ = access_token;
+  client_id_ = client_id;
+  origin_ = origin;
+  StartRevocation();
+}
+
+void OAuth2RevocationFetcher::StartRevocation() {
+  CHECK_EQ(INITIAL, state_);
+  state_ = REVOCATION_STARTED;
+  fetcher_.reset(CreateFetcher(
+      getter_,
+      MakeRevocationUrl(),
+      MakeRevocationHeader(access_token_),
+      MakeRevocationBody(client_id_, origin_),
+      this));
+  fetcher_->Start();  // OnURLFetchComplete will be called.
+}
+
+void OAuth2RevocationFetcher::EndRevocation(const URLFetcher* source) {
+  CHECK_EQ(REVOCATION_STARTED, state_);
+  state_ = REVOCATION_DONE;
+
+  URLRequestStatus status = source->GetStatus();
+  if (!status.is_success()) {
+    OnRevocationFailure(CreateAuthError(status));
+    return;
+  }
+
+  if (source->GetResponseCode() != RC_REQUEST_OK_EMPTY_BODY) {

[zel, 2011/12/06 01:18:19]

what do you get here on regular 200 code?

[Munjal (Google), 2011/12/06 01:36:14]

We don't get a regular 200 code from this API. It returns 204: OK but no body.

+    OnRevocationFailure(GoogleServiceAuthError(
+        GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS));
+    return;
+  }
+
+  OnRevocationSuccess();
+}
+
+void OAuth2RevocationFetcher::OnRevocationSuccess() {
+  consumer_->OnRevocationSuccess();
+}
+
+void OAuth2RevocationFetcher::OnRevocationFailure(
+    GoogleServiceAuthError error) {
+  state_ = ERROR_STATE;
+  consumer_->OnRevocationFailure(error);
+}
+
+void OAuth2RevocationFetcher::OnURLFetchComplete(const URLFetcher* source) {
+  CHECK(source);
+  EndRevocation(source);
+}
+
+// static
+GURL OAuth2RevocationFetcher::MakeRevocationUrl() {
+  return GURL(kOAuth2RevokeTokenURL);
+}
+
+// static
+std::string OAuth2RevocationFetcher::MakeRevocationHeader(
+    const std::string& access_token) {
+  return StringPrintf(kAuthorizationHeaderFormat, access_token.c_str());
+}
+
+// static
+std::string OAuth2RevocationFetcher::MakeRevocationBody(
+    const std::string& client_id,
+    const std::string& origin) {
+  std::string enc_client_id = net::EscapeUrlEncodedData(client_id, true);
+  std::string enc_origin = net::EscapeUrlEncodedData(origin, true);
+  return StringPrintf(
+      kRevocationBodyFormat,
+      enc_client_id.c_str(),
+      enc_origin.c_str());
+}