src/google_apis/gcm/engine/unregistration_request.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "google_apis/gcm/engine/unregistration_request.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "base/metrics/histogram.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/string_piece.h"
  12 #include "base/values.h"
  13 #include "google_apis/gcm/monitoring/gcm_stats_recorder.h"
  14 #include "net/base/escape.h"
  15 #include "net/http/http_request_headers.h"
  16 #include "net/http/http_status_code.h"
  17 #include "net/url_request/url_fetcher.h"
  18 #include "net/url_request/url_request_context_getter.h"
  19 #include "net/url_request/url_request_status.h"
  20
  21 namespace gcm {
  22
  23 namespace {
  24
  25 const char kRequestContentType[] = "application/x-www-form-urlencoded";
  26
  27 // Request constants.
  28 const char kAppIdKey[] = "app";
  29 const char kDeleteKey[] = "delete";
  30 const char kDeleteValue[] = "true";
  31 const char kDeviceIdKey[] = "device";
  32 const char kLoginHeader[] = "AidLogin";
  33 const char kUnregistrationCallerKey[] = "gcm_unreg_caller";
  34 // We are going to set the value to "false" in order to forcefully unregister
  35 // the application.
  36 const char kUnregistrationCallerValue[] = "false";
  37
  38 // Response constants.
  39 const char kDeletedPrefix[] = "deleted=";
  40 const char kErrorPrefix[] = "Error=";
  41 const char kInvalidParameters[] = "INVALID_PARAMETERS";
  42
  43
  44 void BuildFormEncoding(const std::string& key,
  45                        const std::string& value,
  46                        std::string* out) {
  47   if (!out->empty())
  48     out->append("&");
  49   out->append(key + "=" + net::EscapeUrlEncodedData(value, true));
  50 }
  51
  52 UnregistrationRequest::Status ParseFetcherResponse(
  53     const net::URLFetcher* source,
  54     std::string request_app_id) {
  55   if (!source->GetStatus().is_success()) {
  56     DVLOG(1) << "Fetcher failed";
  57     return UnregistrationRequest::URL_FETCHING_FAILED;
  58   }
  59
  60   net::HttpStatusCode response_status = static_cast<net::HttpStatusCode>(
  61       source->GetResponseCode());
  62   if (response_status != net::HTTP_OK) {
  63     DVLOG(1) << "HTTP Status code is not OK, but: " << response_status;
  64     if (response_status == net::HTTP_SERVICE_UNAVAILABLE)
  65       return UnregistrationRequest::SERVICE_UNAVAILABLE;
  66     else if (response_status == net::HTTP_INTERNAL_SERVER_ERROR)
  67       return UnregistrationRequest::INTERNAL_SERVER_ERROR;
  68     return UnregistrationRequest::HTTP_NOT_OK;
  69   }
  70
  71   std::string response;
  72   if (!source->GetResponseAsString(&response)) {
  73     DVLOG(1) << "Failed to get response body.";
  74     return UnregistrationRequest::NO_RESPONSE_BODY;
  75   }
  76
  77   DVLOG(1) << "Parsing unregistration response.";
  78   if (response.find(kDeletedPrefix) != std::string::npos) {
  79     std::string app_id = response.substr(
  80         response.find(kDeletedPrefix) + arraysize(kDeletedPrefix) - 1);
  81     if (app_id == request_app_id)
  82       return UnregistrationRequest::SUCCESS;
  83     return UnregistrationRequest::INCORRECT_APP_ID;
  84   }
  85
  86   if (response.find(kErrorPrefix) != std::string::npos) {
  87     std::string error = response.substr(
  88         response.find(kErrorPrefix) + arraysize(kErrorPrefix) - 1);
  89     if (error == kInvalidParameters)
  90       return UnregistrationRequest::INVALID_PARAMETERS;
  91     return UnregistrationRequest::UNKNOWN_ERROR;
  92   }
  93
  94   DVLOG(1) << "Not able to parse a meaningful output from response body."
  95            << response;
  96   return UnregistrationRequest::RESPONSE_PARSING_FAILED;
  97 }
  98
  99 }  // namespace
 100
 101 UnregistrationRequest::RequestInfo::RequestInfo(
 102     uint64 android_id,
 103     uint64 security_token,
 104     const std::string& app_id)
 105     : android_id(android_id),
 106       security_token(security_token),
 107       app_id(app_id) {
 108 }
 109
 110 UnregistrationRequest::RequestInfo::~RequestInfo() {}
 111
 112 UnregistrationRequest::UnregistrationRequest(
 113     const GURL& registration_url,
 114     const RequestInfo& request_info,
 115     const net::BackoffEntry::Policy& backoff_policy,
 116     const UnregistrationCallback& callback,
 117     scoped_refptr<net::URLRequestContextGetter> request_context_getter,
 118     GCMStatsRecorder* recorder)
 119     : callback_(callback),
 120       request_info_(request_info),
 121       registration_url_(registration_url),
 122       backoff_entry_(&backoff_policy),
 123       request_context_getter_(request_context_getter),
 124       recorder_(recorder),
 125       weak_ptr_factory_(this) {
 126 }
 127
 128 UnregistrationRequest::~UnregistrationRequest() {}
 129
 130 void UnregistrationRequest::Start() {
 131   DCHECK(!callback_.is_null());
 132   DCHECK(request_info_.android_id != 0UL);
 133   DCHECK(request_info_.security_token != 0UL);
 134   DCHECK(!url_fetcher_.get());
 135
 136   url_fetcher_.reset(net::URLFetcher::Create(
 137       registration_url_, net::URLFetcher::POST, this));
 138   url_fetcher_->SetRequestContext(request_context_getter_);
 139
 140   std::string android_id = base::Uint64ToString(request_info_.android_id);
 141   std::string auth_header =
 142       std::string(kLoginHeader) + " " + android_id + ":" +
 143       base::Uint64ToString(request_info_.security_token);
 144   net::HttpRequestHeaders headers;
 145   headers.SetHeader(net::HttpRequestHeaders::kAuthorization, auth_header);
 146   headers.SetHeader(kAppIdKey, request_info_.app_id);
 147   url_fetcher_->SetExtraRequestHeaders(headers.ToString());
 148
 149   std::string body;
 150   BuildFormEncoding(kAppIdKey, request_info_.app_id, &body);
 151   BuildFormEncoding(kDeviceIdKey, android_id, &body);
 152   BuildFormEncoding(kDeleteKey, kDeleteValue, &body);
 153   BuildFormEncoding(kUnregistrationCallerKey,
 154                     kUnregistrationCallerValue,
 155                     &body);
 156
 157   DVLOG(1) << "Unregistration request: " << body;
 158   url_fetcher_->SetUploadData(kRequestContentType, body);
 159
 160   DVLOG(1) << "Performing unregistration for: " << request_info_.app_id;
 161   recorder_->RecordUnregistrationSent(request_info_.app_id);
 162   request_start_time_ = base::TimeTicks::Now();
 163   url_fetcher_->Start();
 164 }
 165
 166 void UnregistrationRequest::RetryWithBackoff(bool update_backoff) {
 167   if (update_backoff) {
 168     url_fetcher_.reset();
 169     backoff_entry_.InformOfRequest(false);
 170   }
 171
 172   if (backoff_entry_.ShouldRejectRequest()) {
 173     DVLOG(1) << "Delaying GCM unregistration of app: "
 174              << request_info_.app_id << ", for "
 175              << backoff_entry_.GetTimeUntilRelease().InMilliseconds()
 176              << " milliseconds.";
 177     recorder_->RecordUnregistrationRetryDelayed(
 178         request_info_.app_id,
 179         backoff_entry_.GetTimeUntilRelease().InMilliseconds());
 180     base::MessageLoop::current()->PostDelayedTask(
 181         FROM_HERE,
 182         base::Bind(&UnregistrationRequest::RetryWithBackoff,
 183                    weak_ptr_factory_.GetWeakPtr(),
 184                    false),
 185         backoff_entry_.GetTimeUntilRelease());
 186     return;
 187   }
 188
 189   Start();
 190 }
 191
 192 void UnregistrationRequest::OnURLFetchComplete(const net::URLFetcher* source) {
 193   UnregistrationRequest::Status status =
 194       ParseFetcherResponse(source, request_info_.app_id);
 195
 196   DVLOG(1) << "UnregistrationRequestStauts: " << status;
 197   UMA_HISTOGRAM_ENUMERATION("GCM.UnregistrationRequestStatus",
 198                             status,
 199                             UNREGISTRATION_STATUS_COUNT);
 200   recorder_->RecordUnregistrationResponse(request_info_.app_id, status);
 201
 202   if (status == URL_FETCHING_FAILED ||
 203       status == SERVICE_UNAVAILABLE ||
 204       status == INTERNAL_SERVER_ERROR ||
 205       status == INCORRECT_APP_ID ||
 206       status == RESPONSE_PARSING_FAILED) {
 207     RetryWithBackoff(true);
 208     return;
 209   }
 210
 211   // status == SUCCESS || HTTP_NOT_OK || NO_RESPONSE_BODY ||
 212   // INVALID_PARAMETERS || UNKNOWN_ERROR
 213
 214   if (status == SUCCESS) {
 215     UMA_HISTOGRAM_COUNTS("GCM.UnregistrationRetryCount",
 216                          backoff_entry_.failure_count());
 217     UMA_HISTOGRAM_TIMES("GCM.UnregistrationCompleteTime",
 218                         base::TimeTicks::Now() - request_start_time_);
 219   }
 220
 221   callback_.Run(status);
 222 }
 223
 224 }  // namespace gcm