Drive: Add multipart related utility methods.

google_apis/drive/base_requests.h

 // Copyright (c) 2012 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.
 //
 // This file provides base classes used to issue HTTP requests for Google
 // APIs.
 
 #ifndef GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
 #define GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
 
@@ skipping 12 matching lines @@
 
 namespace base {
 class Value;
 }  // namespace base
 
 namespace google_apis {
 
 class FileResource;
 class RequestSender;
 
+// Content type for multipart body.
+enum MultipartType {
+  MULTIPART_RELATED,
+  MULTIPART_MIXED
+};
+
+// Pair of content type and data.
+struct ContentTypeAndData {
+  std::string type;
+  std::string data;
+};
+
 typedef base::Callback<void(DriveApiErrorCode)> PrepareCallback;
 
 // Callback used for requests that the server returns FileResource data
 // formatted into JSON value.
 typedef base::Callback<void(DriveApiErrorCode error,
                             scoped_ptr<FileResource> entry)>
     FileResourceCallback;
 
 // Callback used for DownloadFileRequest and ResumeUploadRequestBase.
 typedef base::Callback<void(int64 progress, int64 total)> ProgressCallback;
 
 // Callback used to get the content from DownloadFileRequest.
 typedef base::Callback<void(
     DriveApiErrorCode error,
     scoped_ptr<std::string> content)> GetContentCallback;
 
 // Parses JSON passed in |json|. Returns NULL on failure.
 scoped_ptr<base::Value> ParseJson(const std::string& json);
 
+// Generate multipart body. If |predetermined_boundary| is not empty, it uses
+// the string as boundary. Otherwise it generates random boundary that does not
+// conflict with |parts|.
+void GenerateMultipartBody(MultipartType multipart_type,
+                           const std::string& predetermined_boundary,
+                           const std::vector<ContentTypeAndData>& parts,
+                           ContentTypeAndData* output);
+
 //======================= AuthenticatedRequestInterface ======================
 
 // An interface class for implementing a request which requires OAuth2
 // authentication.
 class AuthenticatedRequestInterface {
  public:
   // Called when re-authentication is required. See Start() for details.
   typedef base::Callback<void(AuthenticatedRequestInterface* request)>
       ReAuthenticateCallback;
 
@@ skipping 510 matching lines @@
   const ProgressCallback progress_callback_;
   const GURL download_url_;
   const base::FilePath output_file_path_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileRequestBase);
 };
 
 }  // namespace google_apis
 
 #endif  // GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_