Support getting and deleting token for Instance ID.

google_apis/gcm/engine/gcm_unregistration_request_handler.cc

+// Copyright 2015 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 "google_apis/gcm/engine/gcm_unregistration_request_handler.h"
+
+#include "google_apis/gcm/base/gcm_util.h"
+#include "net/url_request/url_fetcher.h"
+
+namespace gcm {
+
+namespace {
+
+// Request constants.
+const char kUnregistrationCallerKey[] = "gcm_unreg_caller";
+// We are going to set the value to "false" in order to forcefully unregister
+// the application.
+const char kUnregistrationCallerValue[] = "false";
+
+// Response constants.
+const char kDeletedPrefix[] = "deleted=";
+const char kErrorPrefix[] = "Error=";
+const char kInvalidParameters[] = "INVALID_PARAMETERS";
+
+}  // namespace
+
+GCMUnregistrationRequestHandler::GCMUnregistrationRequestHandler(
+    const std::string& app_id)
+    : app_id_(app_id) {
+}
+
+GCMUnregistrationRequestHandler::~GCMUnregistrationRequestHandler() {}
+
+void GCMUnregistrationRequestHandler::BuildRequestBody(std::string* body){
+  BuildFormEncoding(kUnregistrationCallerKey, kUnregistrationCallerValue, body);
+}
+
+UnregistrationRequest::Status GCMUnregistrationRequestHandler::ParseResponse(
+    const net::URLFetcher* source) {
+  std::string response;
+  if (!source->GetResponseAsString(&response)) {
+    DVLOG(1) << "Failed to get response body.";
+    return UnregistrationRequest::NO_RESPONSE_BODY;
+  }
+
+  DVLOG(1) << "Parsing unregistration response.";
+  if (response.find(kDeletedPrefix) != std::string::npos) {
+    std::string deleted_app_id = response.substr(
+        response.find(kDeletedPrefix) + arraysize(kDeletedPrefix) - 1);
+    return deleted_app_id == app_id_ ?
+        UnregistrationRequest::SUCCESS :
+        UnregistrationRequest::INCORRECT_APP_ID;
+  }
+
+  if (response.find(kErrorPrefix) != std::string::npos) {
+    std::string error = response.substr(
+        response.find(kErrorPrefix) + arraysize(kErrorPrefix) - 1);
+   return error == kInvalidParameters ?
+        UnregistrationRequest::INVALID_PARAMETERS :
+        UnregistrationRequest::UNKNOWN_ERROR;
+  }
+
+  DVLOG(1) << "Not able to parse a meaningful output from response body."
+           << response;
+  return UnregistrationRequest::RESPONSE_PARSING_FAILED;
+}
+
+}  // namespace gcm