Store attachment crc in AttachmentStore

sync/internal_api/public/attachments/attachment_downloader_impl.h

 // Copyright 2014 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/threading/non_thread_safe.h"
 #include "google_apis/gaia/oauth2_token_service_request.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "sync/internal_api/public/attachments/attachment_downloader.h"
 #include "url/gurl.h"
 
+namespace base {
+class RefCountedMemory;
+}  // namespace base
+
 namespace net {
 class HttpResponseHeaders;
 }  // namespace net
 
 namespace syncer {
 
 // An implementation of AttachmentDownloader.
 class AttachmentDownloaderImpl : public AttachmentDownloader,
                                  public OAuth2TokenService::Consumer,
                                  public net::URLFetcherDelegate,
@@ skipping 26 matching lines @@
   void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                          const std::string& access_token,
                          const base::Time& expiration_time) override;
   void OnGetTokenFailure(const OAuth2TokenService::Request* request,
                          const GoogleServiceAuthError& error) override;
 
   // net::URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(AttachmentDownloaderImplTest,
+                           ExtractCrc32c_NoHeaders);
   FRIEND_TEST_ALL_PREFIXES(AttachmentDownloaderImplTest, ExtractCrc32c_First);
+  FRIEND_TEST_ALL_PREFIXES(AttachmentDownloaderImplTest, ExtractCrc32c_TooLong);
   FRIEND_TEST_ALL_PREFIXES(AttachmentDownloaderImplTest, ExtractCrc32c_None);
   FRIEND_TEST_ALL_PREFIXES(AttachmentDownloaderImplTest, ExtractCrc32c_Empty);
 
   struct DownloadState;
   typedef std::string AttachmentUrl;
   typedef base::ScopedPtrHashMap<AttachmentUrl, DownloadState> StateMap;
   typedef std::vector<DownloadState*> StateList;
 
   scoped_ptr<net::URLFetcher> CreateFetcher(const AttachmentUrl& url,
                                             const std::string& access_token);
   void RequestAccessToken(DownloadState* download_state);
   void ReportResult(
       const DownloadState& download_state,
       const DownloadResult& result,
-      const scoped_refptr<base::RefCountedString>& attachment_data);
-
-  // Verify the integrity of |data| using the hash received in |fetcher|.
-  //
-  // Assumes that the request in |fetcher| has completed.
-  //
-  // Returns true if the hash of |data| matches the hash contained in |fetcher|
-  // or if |fetcher| contains no hash (no hash, no problem).
-  static bool VerifyHashIfPresent(const net::URLFetcher& fetcher,
-                                  const std::string& data);
+      const scoped_refptr<base::RefCountedString>& attachment_data,
+      uint32_t attachment_crc);
 
   // Extract the crc32c from an X-Goog-Hash header in |headers|.
   //
-  // Return true if a crc32c was found and set |crc32c|.
+  // Return true if a crc32c was found and useable for checking data integrity.
+  // This means headers are present, there is "x-goog-hash" header with "crc32c"
+  // hash in it, this hash is correctly base64 encoded 32 but value.
   SYNC_EXPORT_PRIVATE static bool ExtractCrc32c(
-      const net::HttpResponseHeaders& headers,
-      std::string* crc32c);
+      const net::HttpResponseHeaders* headers,
+      uint32_t* crc32c);
 
   GURL sync_service_url_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   std::string account_id_;
   OAuth2TokenService::ScopeSet oauth2_scopes_;
   scoped_refptr<OAuth2TokenServiceRequest::TokenServiceProvider>
       token_service_provider_;
   scoped_ptr<OAuth2TokenService::Request> access_token_request_;
 
   StateMap state_map_;
   // |requests_waiting_for_access_token_| only keeps references to DownloadState
   // objects while access token request is pending. It doesn't control objects'
   // lifetime.
   StateList requests_waiting_for_access_token_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentDownloaderImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_