src/google_apis/drive/base_requests.cc

   1 // Copyright (c) 2012 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/drive/base_requests.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/location.h"
   9 #include "base/sequenced_task_runner.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/task_runner_util.h"
  13 #include "base/values.h"
  14 #include "google_apis/drive/request_sender.h"
  15 #include "google_apis/drive/task_util.h"
  16 #include "net/base/io_buffer.h"
  17 #include "net/base/load_flags.h"
  18 #include "net/base/net_errors.h"
  19 #include "net/http/http_byte_range.h"
  20 #include "net/http/http_response_headers.h"
  21 #include "net/http/http_util.h"
  22 #include "net/url_request/url_fetcher.h"
  23 #include "net/url_request/url_request_status.h"
  24
  25 using net::URLFetcher;
  26
  27 namespace {
  28
  29 // Template for optional OAuth2 authorization HTTP header.
  30 const char kAuthorizationHeaderFormat[] = "Authorization: Bearer %s";
  31 // Template for GData API version HTTP header.
  32 const char kGDataVersionHeader[] = "GData-Version: 3.0";
  33
  34 // Maximum number of attempts for re-authentication per request.
  35 const int kMaxReAuthenticateAttemptsPerRequest = 1;
  36
  37 // Template for initiate upload of both GData WAPI and Drive API v2.
  38 const char kUploadContentType[] = "X-Upload-Content-Type: ";
  39 const char kUploadContentLength[] = "X-Upload-Content-Length: ";
  40 const char kUploadResponseLocation[] = "location";
  41
  42 // Template for upload data range of both GData WAPI and Drive API v2.
  43 const char kUploadContentRange[] = "Content-Range: bytes ";
  44 const char kUploadResponseRange[] = "range";
  45
  46 // Parse JSON string to base::Value object.
  47 scoped_ptr<base::Value> ParseJsonInternal(const std::string& json) {
  48   int error_code = -1;
  49   std::string error_message;
  50   scoped_ptr<base::Value> value(base::JSONReader::ReadAndReturnError(
  51       json, base::JSON_PARSE_RFC, &error_code, &error_message));
  52
  53   if (!value.get()) {
  54     std::string trimmed_json;
  55     if (json.size() < 80) {
  56       trimmed_json  = json;
  57     } else {
  58       // Take the first 50 and the last 10 bytes.
  59       trimmed_json = base::StringPrintf(
  60           "%s [%s bytes] %s",
  61           json.substr(0, 50).c_str(),
  62           base::Uint64ToString(json.size() - 60).c_str(),
  63           json.substr(json.size() - 10).c_str());
  64     }
  65     LOG(WARNING) << "Error while parsing entry response: " << error_message
  66                  << ", code: " << error_code << ", json:\n" << trimmed_json;
  67   }
  68   return value.Pass();
  69 }
  70
  71 // Returns response headers as a string. Returns a warning message if
  72 // |url_fetcher| does not contain a valid response. Used only for debugging.
  73 std::string GetResponseHeadersAsString(
  74     const URLFetcher* url_fetcher) {
  75   // net::HttpResponseHeaders::raw_headers(), as the name implies, stores
  76   // all headers in their raw format, i.e each header is null-terminated.
  77   // So logging raw_headers() only shows the first header, which is probably
  78   // the status line.  GetNormalizedHeaders, on the other hand, will show all
  79   // the headers, one per line, which is probably what we want.
  80   std::string headers;
  81   // Check that response code indicates response headers are valid (i.e. not
  82   // malformed) before we retrieve the headers.
  83   if (url_fetcher->GetResponseCode() == URLFetcher::RESPONSE_CODE_INVALID) {
  84     headers.assign("Response headers are malformed!!");
  85   } else {
  86     url_fetcher->GetResponseHeaders()->GetNormalizedHeaders(&headers);
  87   }
  88   return headers;
  89 }
  90
  91 bool IsSuccessfulResponseCode(int response_code) {
  92   return 200 <= response_code && response_code <= 299;
  93 }
  94
  95 }  // namespace
  96
  97 namespace google_apis {
  98
  99 void ParseJson(base::TaskRunner* blocking_task_runner,
 100                const std::string& json,
 101                const ParseJsonCallback& callback) {
 102   base::PostTaskAndReplyWithResult(
 103       blocking_task_runner,
 104       FROM_HERE,
 105       base::Bind(&ParseJsonInternal, json),
 106       callback);
 107 }
 108
 109 //=========================== ResponseWriter ==================================
 110 ResponseWriter::ResponseWriter(base::SequencedTaskRunner* file_task_runner,
 111                                const base::FilePath& file_path,
 112                                const GetContentCallback& get_content_callback)
 113     : get_content_callback_(get_content_callback),
 114       weak_ptr_factory_(this) {
 115   if (!file_path.empty()) {
 116     file_writer_.reset(
 117         new net::URLFetcherFileWriter(file_task_runner, file_path));
 118   }
 119 }
 120
 121 ResponseWriter::~ResponseWriter() {
 122 }
 123
 124 void ResponseWriter::DisownFile() {
 125   DCHECK(file_writer_);
 126   file_writer_->DisownFile();
 127 }
 128
 129 int ResponseWriter::Initialize(const net::CompletionCallback& callback) {
 130   if (file_writer_)
 131     return file_writer_->Initialize(callback);
 132
 133   data_.clear();
 134   return net::OK;
 135 }
 136
 137 int ResponseWriter::Write(net::IOBuffer* buffer,
 138                           int num_bytes,
 139                           const net::CompletionCallback& callback) {
 140   if (!get_content_callback_.is_null()) {
 141     get_content_callback_.Run(
 142         HTTP_SUCCESS,
 143         make_scoped_ptr(new std::string(buffer->data(), num_bytes)));
 144   }
 145
 146   if (file_writer_) {
 147     const int result = file_writer_->Write(
 148         buffer, num_bytes,
 149         base::Bind(&ResponseWriter::DidWrite,
 150                    weak_ptr_factory_.GetWeakPtr(),
 151                    make_scoped_refptr(buffer), callback));
 152     if (result != net::ERR_IO_PENDING)
 153       DidWrite(buffer, net::CompletionCallback(), result);
 154     return result;
 155   }
 156
 157   data_.append(buffer->data(), num_bytes);
 158   return num_bytes;
 159 }
 160
 161 int ResponseWriter::Finish(const net::CompletionCallback& callback) {
 162   if (file_writer_)
 163     return file_writer_->Finish(callback);
 164
 165   return net::OK;
 166 }
 167
 168 void ResponseWriter::DidWrite(scoped_refptr<net::IOBuffer> buffer,
 169                               const net::CompletionCallback& callback,
 170                               int result) {
 171   if (result > 0) {
 172     // Even if file_writer_ is used, append the data to |data_|, so that it can
 173     // be used to get error information in case of server side errors.
 174     // The size limit is to avoid consuming too much redundant memory.
 175     const size_t kMaxStringSize = 1024*1024;
 176     if (data_.size() < kMaxStringSize) {
 177       data_.append(buffer->data(), std::min(static_cast<size_t>(result),
 178                                             kMaxStringSize - data_.size()));
 179     }
 180   }
 181
 182   if (!callback.is_null())
 183     callback.Run(result);
 184 }
 185
 186 //============================ UrlFetchRequestBase ===========================
 187
 188 UrlFetchRequestBase::UrlFetchRequestBase(RequestSender* sender)
 189     : re_authenticate_count_(0),
 190       sender_(sender),
 191       error_code_(GDATA_OTHER_ERROR),
 192       weak_ptr_factory_(this) {
 193 }
 194
 195 UrlFetchRequestBase::~UrlFetchRequestBase() {}
 196
 197 void UrlFetchRequestBase::Start(const std::string& access_token,
 198                                 const std::string& custom_user_agent,
 199                                 const ReAuthenticateCallback& callback) {
 200   DCHECK(CalledOnValidThread());
 201   DCHECK(!access_token.empty());
 202   DCHECK(!callback.is_null());
 203   DCHECK(re_authenticate_callback_.is_null());
 204
 205   re_authenticate_callback_ = callback;
 206
 207   GURL url = GetURL();
 208   if (url.is_empty()) {
 209     // Error is found on generating the url. Send the error message to the
 210     // callback, and then return immediately without trying to connect
 211     // to the server.
 212     RunCallbackOnPrematureFailure(GDATA_OTHER_ERROR);
 213     return;
 214   }
 215   DVLOG(1) << "URL: " << url.spec();
 216
 217   URLFetcher::RequestType request_type = GetRequestType();
 218   url_fetcher_.reset(
 219       URLFetcher::Create(url, request_type, this));
 220   url_fetcher_->SetRequestContext(sender_->url_request_context_getter());
 221   // Always set flags to neither send nor save cookies.
 222   url_fetcher_->SetLoadFlags(
 223       net::LOAD_DO_NOT_SEND_COOKIES | net::LOAD_DO_NOT_SAVE_COOKIES |
 224       net::LOAD_DISABLE_CACHE);
 225
 226   base::FilePath output_file_path;
 227   GetContentCallback get_content_callback;
 228   GetOutputFilePath(&output_file_path, &get_content_callback);
 229   if (!get_content_callback.is_null())
 230     get_content_callback = CreateRelayCallback(get_content_callback);
 231   response_writer_ = new ResponseWriter(blocking_task_runner(),
 232                                         output_file_path,
 233                                         get_content_callback);
 234   url_fetcher_->SaveResponseWithWriter(
 235       scoped_ptr<net::URLFetcherResponseWriter>(response_writer_));
 236
 237   // Add request headers.
 238   // Note that SetExtraRequestHeaders clears the current headers and sets it
 239   // to the passed-in headers, so calling it for each header will result in
 240   // only the last header being set in request headers.
 241   if (!custom_user_agent.empty())
 242     url_fetcher_->AddExtraRequestHeader("User-Agent: " + custom_user_agent);
 243   url_fetcher_->AddExtraRequestHeader(kGDataVersionHeader);
 244   url_fetcher_->AddExtraRequestHeader(
 245       base::StringPrintf(kAuthorizationHeaderFormat, access_token.data()));
 246   std::vector<std::string> headers = GetExtraRequestHeaders();
 247   for (size_t i = 0; i < headers.size(); ++i) {
 248     url_fetcher_->AddExtraRequestHeader(headers[i]);
 249     DVLOG(1) << "Extra header: " << headers[i];
 250   }
 251
 252   // Set upload data if available.
 253   std::string upload_content_type;
 254   std::string upload_content;
 255   if (GetContentData(&upload_content_type, &upload_content)) {
 256     url_fetcher_->SetUploadData(upload_content_type, upload_content);
 257   } else {
 258     base::FilePath local_file_path;
 259     int64 range_offset = 0;
 260     int64 range_length = 0;
 261     if (GetContentFile(&local_file_path, &range_offset, &range_length,
 262                        &upload_content_type)) {
 263       url_fetcher_->SetUploadFilePath(
 264           upload_content_type,
 265           local_file_path,
 266           range_offset,
 267           range_length,
 268           blocking_task_runner());
 269     } else {
 270       // Even if there is no content data, UrlFetcher requires to set empty
 271       // upload data string for POST, PUT and PATCH methods, explicitly.
 272       // It is because that most requests of those methods have non-empty
 273       // body, and UrlFetcher checks whether it is actually not forgotten.
 274       if (request_type == URLFetcher::POST ||
 275           request_type == URLFetcher::PUT ||
 276           request_type == URLFetcher::PATCH) {
 277         // Set empty upload content-type and upload content, so that
 278         // the request will have no "Content-type: " header and no content.
 279         url_fetcher_->SetUploadData(std::string(), std::string());
 280       }
 281     }
 282   }
 283
 284   url_fetcher_->Start();
 285 }
 286
 287 URLFetcher::RequestType UrlFetchRequestBase::GetRequestType() const {
 288   return URLFetcher::GET;
 289 }
 290
 291 std::vector<std::string> UrlFetchRequestBase::GetExtraRequestHeaders() const {
 292   return std::vector<std::string>();
 293 }
 294
 295 bool UrlFetchRequestBase::GetContentData(std::string* upload_content_type,
 296                                          std::string* upload_content) {
 297   return false;
 298 }
 299
 300 bool UrlFetchRequestBase::GetContentFile(base::FilePath* local_file_path,
 301                                          int64* range_offset,
 302                                          int64* range_length,
 303                                          std::string* upload_content_type) {
 304   return false;
 305 }
 306
 307 void UrlFetchRequestBase::GetOutputFilePath(
 308     base::FilePath* local_file_path,
 309     GetContentCallback* get_content_callback) {
 310 }
 311
 312 void UrlFetchRequestBase::Cancel() {
 313   response_writer_ = NULL;
 314   url_fetcher_.reset(NULL);
 315   RunCallbackOnPrematureFailure(GDATA_CANCELLED);
 316   sender_->RequestFinished(this);
 317 }
 318
 319 GDataErrorCode UrlFetchRequestBase::GetErrorCode() {
 320   return error_code_;
 321 }
 322
 323 bool UrlFetchRequestBase::CalledOnValidThread() {
 324   return thread_checker_.CalledOnValidThread();
 325 }
 326
 327 base::SequencedTaskRunner* UrlFetchRequestBase::blocking_task_runner() const {
 328   return sender_->blocking_task_runner();
 329 }
 330
 331 void UrlFetchRequestBase::OnProcessURLFetchResultsComplete() {
 332   sender_->RequestFinished(this);
 333 }
 334
 335 void UrlFetchRequestBase::OnURLFetchComplete(const URLFetcher* source) {
 336   DVLOG(1) << "Response headers:\n" << GetResponseHeadersAsString(source);
 337
 338   // Determine error code.
 339   error_code_ = static_cast<GDataErrorCode>(source->GetResponseCode());
 340   if (!source->GetStatus().is_success()) {
 341     switch (source->GetStatus().error()) {
 342       case net::ERR_NETWORK_CHANGED:
 343         error_code_ = GDATA_NO_CONNECTION;
 344         break;
 345       default:
 346         error_code_ = GDATA_OTHER_ERROR;
 347     }
 348   }
 349
 350   // The server may return detailed error status in JSON.
 351   // See https://developers.google.com/drive/handle-errors
 352   if (!IsSuccessfulResponseCode(error_code_)) {
 353     DVLOG(1) << response_writer_->data();
 354
 355     const char kErrorKey[] = "error";
 356     const char kErrorErrorsKey[] = "errors";
 357     const char kErrorReasonKey[] = "reason";
 358     const char kErrorMessageKey[] = "message";
 359     const char kErrorReasonRateLimitExceeded[] = "rateLimitExceeded";
 360     const char kErrorReasonUserRateLimitExceeded[] = "userRateLimitExceeded";
 361
 362     scoped_ptr<base::Value> value(ParseJsonInternal(response_writer_->data()));
 363     base::DictionaryValue* dictionary = NULL;
 364     base::DictionaryValue* error = NULL;
 365     if (value &&
 366         value->GetAsDictionary(&dictionary) &&
 367         dictionary->GetDictionaryWithoutPathExpansion(kErrorKey, &error)) {
 368       // Get error message.
 369       std::string message;
 370       error->GetStringWithoutPathExpansion(kErrorMessageKey, &message);
 371       DLOG(ERROR) << "code: " << error_code_ << ", message: " << message;
 372
 373       // Override the error code based on the reason of the first error.
 374       base::ListValue* errors = NULL;
 375       base::DictionaryValue* first_error = NULL;
 376       if (error->GetListWithoutPathExpansion(kErrorErrorsKey, &errors) &&
 377           errors->GetDictionary(0, &first_error)) {
 378         std::string reason;
 379         first_error->GetStringWithoutPathExpansion(kErrorReasonKey, &reason);
 380         if (reason == kErrorReasonRateLimitExceeded ||
 381             reason == kErrorReasonUserRateLimitExceeded)
 382           error_code_ = HTTP_SERVICE_UNAVAILABLE;
 383       }
 384     }
 385   }
 386
 387   // Handle authentication failure.
 388   if (error_code_ == HTTP_UNAUTHORIZED) {
 389     if (++re_authenticate_count_ <= kMaxReAuthenticateAttemptsPerRequest) {
 390       // Reset re_authenticate_callback_ so Start() can be called again.
 391       ReAuthenticateCallback callback = re_authenticate_callback_;
 392       re_authenticate_callback_.Reset();
 393       callback.Run(this);
 394       return;
 395     }
 396
 397     OnAuthFailed(error_code_);
 398     return;
 399   }
 400
 401   // Overridden by each specialization
 402   ProcessURLFetchResults(source);
 403 }
 404
 405 void UrlFetchRequestBase::OnAuthFailed(GDataErrorCode code) {
 406   RunCallbackOnPrematureFailure(code);
 407   sender_->RequestFinished(this);
 408 }
 409
 410 base::WeakPtr<AuthenticatedRequestInterface>
 411 UrlFetchRequestBase::GetWeakPtr() {
 412   return weak_ptr_factory_.GetWeakPtr();
 413 }
 414
 415 //============================ EntryActionRequest ============================
 416
 417 EntryActionRequest::EntryActionRequest(RequestSender* sender,
 418                                        const EntryActionCallback& callback)
 419     : UrlFetchRequestBase(sender),
 420       callback_(callback) {
 421   DCHECK(!callback_.is_null());
 422 }
 423
 424 EntryActionRequest::~EntryActionRequest() {}
 425
 426 void EntryActionRequest::ProcessURLFetchResults(const URLFetcher* source) {
 427   callback_.Run(GetErrorCode());
 428   OnProcessURLFetchResultsComplete();
 429 }
 430
 431 void EntryActionRequest::RunCallbackOnPrematureFailure(GDataErrorCode code) {
 432   callback_.Run(code);
 433 }
 434
 435 //============================== GetDataRequest ==============================
 436
 437 GetDataRequest::GetDataRequest(RequestSender* sender,
 438                                const GetDataCallback& callback)
 439     : UrlFetchRequestBase(sender),
 440       callback_(callback),
 441       weak_ptr_factory_(this) {
 442   DCHECK(!callback_.is_null());
 443 }
 444
 445 GetDataRequest::~GetDataRequest() {}
 446
 447 void GetDataRequest::ParseResponse(GDataErrorCode fetch_error_code,
 448                                    const std::string& data) {
 449   DCHECK(CalledOnValidThread());
 450
 451   VLOG(1) << "JSON received from " << GetURL().spec() << ": "
 452           << data.size() << " bytes";
 453   ParseJson(blocking_task_runner(),
 454             data,
 455             base::Bind(&GetDataRequest::OnDataParsed,
 456                        weak_ptr_factory_.GetWeakPtr(),
 457                        fetch_error_code));
 458 }
 459
 460 void GetDataRequest::ProcessURLFetchResults(const URLFetcher* source) {
 461   GDataErrorCode fetch_error_code = GetErrorCode();
 462
 463   switch (fetch_error_code) {
 464     case HTTP_SUCCESS:
 465     case HTTP_CREATED:
 466       ParseResponse(fetch_error_code, response_writer()->data());
 467       break;
 468     default:
 469       RunCallbackOnPrematureFailure(fetch_error_code);
 470       OnProcessURLFetchResultsComplete();
 471       break;
 472   }
 473 }
 474
 475 void GetDataRequest::RunCallbackOnPrematureFailure(
 476     GDataErrorCode fetch_error_code) {
 477   callback_.Run(fetch_error_code, scoped_ptr<base::Value>());
 478 }
 479
 480 void GetDataRequest::OnDataParsed(GDataErrorCode fetch_error_code,
 481                                   scoped_ptr<base::Value> value) {
 482   DCHECK(CalledOnValidThread());
 483
 484   if (!value.get())
 485     fetch_error_code = GDATA_PARSE_ERROR;
 486
 487   callback_.Run(fetch_error_code, value.Pass());
 488   OnProcessURLFetchResultsComplete();
 489 }
 490
 491 //========================= InitiateUploadRequestBase ========================
 492
 493 InitiateUploadRequestBase::InitiateUploadRequestBase(
 494     RequestSender* sender,
 495     const InitiateUploadCallback& callback,
 496     const std::string& content_type,
 497     int64 content_length)
 498     : UrlFetchRequestBase(sender),
 499       callback_(callback),
 500       content_type_(content_type),
 501       content_length_(content_length) {
 502   DCHECK(!callback_.is_null());
 503   DCHECK(!content_type_.empty());
 504   DCHECK_GE(content_length_, 0);
 505 }
 506
 507 InitiateUploadRequestBase::~InitiateUploadRequestBase() {}
 508
 509 void InitiateUploadRequestBase::ProcessURLFetchResults(
 510     const URLFetcher* source) {
 511   GDataErrorCode code = GetErrorCode();
 512
 513   std::string upload_location;
 514   if (code == HTTP_SUCCESS) {
 515     // Retrieve value of the first "Location" header.
 516     source->GetResponseHeaders()->EnumerateHeader(NULL,
 517                                                   kUploadResponseLocation,
 518                                                   &upload_location);
 519   }
 520
 521   callback_.Run(code, GURL(upload_location));
 522   OnProcessURLFetchResultsComplete();
 523 }
 524
 525 void InitiateUploadRequestBase::RunCallbackOnPrematureFailure(
 526     GDataErrorCode code) {
 527   callback_.Run(code, GURL());
 528 }
 529
 530 std::vector<std::string>
 531 InitiateUploadRequestBase::GetExtraRequestHeaders() const {
 532   std::vector<std::string> headers;
 533   headers.push_back(kUploadContentType + content_type_);
 534   headers.push_back(
 535       kUploadContentLength + base::Int64ToString(content_length_));
 536   return headers;
 537 }
 538
 539 //============================ UploadRangeResponse =============================
 540
 541 UploadRangeResponse::UploadRangeResponse()
 542     : code(HTTP_SUCCESS),
 543       start_position_received(0),
 544       end_position_received(0) {
 545 }
 546
 547 UploadRangeResponse::UploadRangeResponse(GDataErrorCode code,
 548                                          int64 start_position_received,
 549                                          int64 end_position_received)
 550     : code(code),
 551       start_position_received(start_position_received),
 552       end_position_received(end_position_received) {
 553 }
 554
 555 UploadRangeResponse::~UploadRangeResponse() {
 556 }
 557
 558 //========================== UploadRangeRequestBase ==========================
 559
 560 UploadRangeRequestBase::UploadRangeRequestBase(RequestSender* sender,
 561                                                const GURL& upload_url)
 562     : UrlFetchRequestBase(sender),
 563       upload_url_(upload_url),
 564       weak_ptr_factory_(this) {
 565 }
 566
 567 UploadRangeRequestBase::~UploadRangeRequestBase() {}
 568
 569 GURL UploadRangeRequestBase::GetURL() const {
 570   // This is very tricky to get json from this request. To do that, &alt=json
 571   // has to be appended not here but in InitiateUploadRequestBase::GetURL().
 572   return upload_url_;
 573 }
 574
 575 URLFetcher::RequestType UploadRangeRequestBase::GetRequestType() const {
 576   return URLFetcher::PUT;
 577 }
 578
 579 void UploadRangeRequestBase::ProcessURLFetchResults(
 580     const URLFetcher* source) {
 581   GDataErrorCode code = GetErrorCode();
 582   net::HttpResponseHeaders* hdrs = source->GetResponseHeaders();
 583
 584   if (code == HTTP_RESUME_INCOMPLETE) {
 585     // Retrieve value of the first "Range" header.
 586     // The Range header is appeared only if there is at least one received
 587     // byte. So, initialize the positions by 0 so that the [0,0) will be
 588     // returned via the |callback_| for empty data case.
 589     int64 start_position_received = 0;
 590     int64 end_position_received = 0;
 591     std::string range_received;
 592     hdrs->EnumerateHeader(NULL, kUploadResponseRange, &range_received);
 593     if (!range_received.empty()) {  // Parse the range header.
 594       std::vector<net::HttpByteRange> ranges;
 595       if (net::HttpUtil::ParseRangeHeader(range_received, &ranges) &&
 596           !ranges.empty() ) {
 597         // We only care about the first start-end pair in the range.
 598         //
 599         // Range header represents the range inclusively, while we are treating
 600         // ranges exclusively (i.e., end_position_received should be one passed
 601         // the last valid index). So "+ 1" is added.
 602         start_position_received = ranges[0].first_byte_position();
 603         end_position_received = ranges[0].last_byte_position() + 1;
 604       }
 605     }
 606     // The Range header has the received data range, so the start position
 607     // should be always 0.
 608     DCHECK_EQ(start_position_received, 0);
 609
 610     OnRangeRequestComplete(UploadRangeResponse(code,
 611                                                start_position_received,
 612                                                end_position_received),
 613                            scoped_ptr<base::Value>());
 614
 615     OnProcessURLFetchResultsComplete();
 616   } else if (code == HTTP_CREATED || code == HTTP_SUCCESS) {
 617     // The upload is successfully done. Parse the response which should be
 618     // the entry's metadata.
 619     ParseJson(blocking_task_runner(),
 620               response_writer()->data(),
 621               base::Bind(&UploadRangeRequestBase::OnDataParsed,
 622                          weak_ptr_factory_.GetWeakPtr(),
 623                          code));
 624   } else {
 625     // Failed to upload. Run callbacks to notify the error.
 626     OnRangeRequestComplete(
 627         UploadRangeResponse(code, -1, -1), scoped_ptr<base::Value>());
 628     OnProcessURLFetchResultsComplete();
 629   }
 630 }
 631
 632 void UploadRangeRequestBase::OnDataParsed(GDataErrorCode code,
 633                                           scoped_ptr<base::Value> value) {
 634   DCHECK(CalledOnValidThread());
 635   DCHECK(code == HTTP_CREATED || code == HTTP_SUCCESS);
 636
 637   OnRangeRequestComplete(UploadRangeResponse(code, -1, -1), value.Pass());
 638   OnProcessURLFetchResultsComplete();
 639 }
 640
 641 void UploadRangeRequestBase::RunCallbackOnPrematureFailure(
 642     GDataErrorCode code) {
 643   OnRangeRequestComplete(
 644       UploadRangeResponse(code, 0, 0), scoped_ptr<base::Value>());
 645 }
 646
 647 //========================== ResumeUploadRequestBase =========================
 648
 649 ResumeUploadRequestBase::ResumeUploadRequestBase(
 650     RequestSender* sender,
 651     const GURL& upload_location,
 652     int64 start_position,
 653     int64 end_position,
 654     int64 content_length,
 655     const std::string& content_type,
 656     const base::FilePath& local_file_path)
 657     : UploadRangeRequestBase(sender, upload_location),
 658       start_position_(start_position),
 659       end_position_(end_position),
 660       content_length_(content_length),
 661       content_type_(content_type),
 662       local_file_path_(local_file_path) {
 663   DCHECK_LE(start_position_, end_position_);
 664 }
 665
 666 ResumeUploadRequestBase::~ResumeUploadRequestBase() {}
 667
 668 std::vector<std::string>
 669 ResumeUploadRequestBase::GetExtraRequestHeaders() const {
 670   if (content_length_ == 0) {
 671     // For uploading an empty document, just PUT an empty content.
 672     DCHECK_EQ(start_position_, 0);
 673     DCHECK_EQ(end_position_, 0);
 674     return std::vector<std::string>();
 675   }
 676
 677   // The header looks like
 678   // Content-Range: bytes <start_position>-<end_position>/<content_length>
 679   // for example:
 680   // Content-Range: bytes 7864320-8388607/13851821
 681   // The header takes inclusive range, so we adjust by "end_position - 1".
 682   DCHECK_GE(start_position_, 0);
 683   DCHECK_GT(end_position_, 0);
 684   DCHECK_GE(content_length_, 0);
 685
 686   std::vector<std::string> headers;
 687   headers.push_back(
 688       std::string(kUploadContentRange) +
 689       base::Int64ToString(start_position_) + "-" +
 690       base::Int64ToString(end_position_ - 1) + "/" +
 691       base::Int64ToString(content_length_));
 692   return headers;
 693 }
 694
 695 bool ResumeUploadRequestBase::GetContentFile(
 696     base::FilePath* local_file_path,
 697     int64* range_offset,
 698     int64* range_length,
 699     std::string* upload_content_type) {
 700   if (start_position_ == end_position_) {
 701     // No content data.
 702     return false;
 703   }
 704
 705   *local_file_path = local_file_path_;
 706   *range_offset = start_position_;
 707   *range_length = end_position_ - start_position_;
 708   *upload_content_type = content_type_;
 709   return true;
 710 }
 711
 712 //======================== GetUploadStatusRequestBase ========================
 713
 714 GetUploadStatusRequestBase::GetUploadStatusRequestBase(RequestSender* sender,
 715                                                        const GURL& upload_url,
 716                                                        int64 content_length)
 717     : UploadRangeRequestBase(sender, upload_url),
 718       content_length_(content_length) {}
 719
 720 GetUploadStatusRequestBase::~GetUploadStatusRequestBase() {}
 721
 722 std::vector<std::string>
 723 GetUploadStatusRequestBase::GetExtraRequestHeaders() const {
 724   // The header looks like
 725   // Content-Range: bytes */<content_length>
 726   // for example:
 727   // Content-Range: bytes */13851821
 728   DCHECK_GE(content_length_, 0);
 729
 730   std::vector<std::string> headers;
 731   headers.push_back(
 732       std::string(kUploadContentRange) + "*/" +
 733       base::Int64ToString(content_length_));
 734   return headers;
 735 }
 736
 737 //============================ DownloadFileRequestBase =========================
 738
 739 DownloadFileRequestBase::DownloadFileRequestBase(
 740     RequestSender* sender,
 741     const DownloadActionCallback& download_action_callback,
 742     const GetContentCallback& get_content_callback,
 743     const ProgressCallback& progress_callback,
 744     const GURL& download_url,
 745     const base::FilePath& output_file_path)
 746     : UrlFetchRequestBase(sender),
 747       download_action_callback_(download_action_callback),
 748       get_content_callback_(get_content_callback),
 749       progress_callback_(progress_callback),
 750       download_url_(download_url),
 751       output_file_path_(output_file_path) {
 752   DCHECK(!download_action_callback_.is_null());
 753   DCHECK(!output_file_path_.empty());
 754   // get_content_callback may be null.
 755 }
 756
 757 DownloadFileRequestBase::~DownloadFileRequestBase() {}
 758
 759 // Overridden from UrlFetchRequestBase.
 760 GURL DownloadFileRequestBase::GetURL() const {
 761   return download_url_;
 762 }
 763
 764 void DownloadFileRequestBase::GetOutputFilePath(
 765     base::FilePath* local_file_path,
 766     GetContentCallback* get_content_callback) {
 767   // Configure so that the downloaded content is saved to |output_file_path_|.
 768   *local_file_path = output_file_path_;
 769   *get_content_callback = get_content_callback_;
 770 }
 771
 772 void DownloadFileRequestBase::OnURLFetchDownloadProgress(
 773     const URLFetcher* source,
 774     int64 current,
 775     int64 total) {
 776   if (!progress_callback_.is_null())
 777     progress_callback_.Run(current, total);
 778 }
 779
 780 void DownloadFileRequestBase::ProcessURLFetchResults(const URLFetcher* source) {
 781   GDataErrorCode code = GetErrorCode();
 782
 783   // Take over the ownership of the the downloaded temp file.
 784   base::FilePath temp_file;
 785   if (code == HTTP_SUCCESS) {
 786     response_writer()->DisownFile();
 787     temp_file = output_file_path_;
 788   }
 789
 790   download_action_callback_.Run(code, temp_file);
 791   OnProcessURLFetchResultsComplete();
 792 }
 793
 794 void DownloadFileRequestBase::RunCallbackOnPrematureFailure(
 795     GDataErrorCode code) {
 796   download_action_callback_.Run(code, base::FilePath());
 797 }
 798
 799 }  // namespace google_apis