storage/browser/fileapi/file_system_url_request_job.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 "storage/browser/fileapi/file_system_url_request_job.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/file_util_proxy.h"
  13 #include "base/message_loop/message_loop.h"
  14 #include "base/message_loop/message_loop_proxy.h"
  15 #include "base/threading/thread_restrictions.h"
  16 #include "base/time/time.h"
  17 #include "build/build_config.h"
  18 #include "net/base/file_stream.h"
  19 #include "net/base/io_buffer.h"
  20 #include "net/base/mime_util.h"
  21 #include "net/base/net_errors.h"
  22 #include "net/base/net_util.h"
  23 #include "net/http/http_response_headers.h"
  24 #include "net/http/http_response_info.h"
  25 #include "net/http/http_util.h"
  26 #include "net/url_request/url_request.h"
  27 #include "storage/browser/fileapi/file_stream_reader.h"
  28 #include "storage/browser/fileapi/file_system_context.h"
  29 #include "storage/browser/fileapi/file_system_operation_runner.h"
  30 #include "storage/common/fileapi/file_system_util.h"
  31 #include "url/gurl.h"
  32
  33 using net::NetworkDelegate;
  34 using net::URLRequest;
  35 using net::URLRequestJob;
  36 using net::URLRequestStatus;
  37
  38 namespace storage {
  39
  40 static net::HttpResponseHeaders* CreateHttpResponseHeaders() {
  41   // HttpResponseHeaders expects its input string to be terminated by two NULs.
  42   static const char kStatus[] = "HTTP/1.1 200 OK\0";
  43   static const size_t kStatusLen = arraysize(kStatus);
  44
  45   net::HttpResponseHeaders* headers =
  46       new net::HttpResponseHeaders(std::string(kStatus, kStatusLen));
  47
  48   // Tell WebKit never to cache this content.
  49   std::string cache_control(net::HttpRequestHeaders::kCacheControl);
  50   cache_control.append(": no-cache");
  51   headers->AddHeader(cache_control);
  52
  53   return headers;
  54 }
  55
  56 FileSystemURLRequestJob::FileSystemURLRequestJob(
  57     URLRequest* request,
  58     NetworkDelegate* network_delegate,
  59     const std::string& storage_domain,
  60     FileSystemContext* file_system_context)
  61     : URLRequestJob(request, network_delegate),
  62       storage_domain_(storage_domain),
  63       file_system_context_(file_system_context),
  64       is_directory_(false),
  65       remaining_bytes_(0),
  66       weak_factory_(this) {
  67 }
  68
  69 FileSystemURLRequestJob::~FileSystemURLRequestJob() {}
  70
  71 void FileSystemURLRequestJob::Start() {
  72   base::MessageLoop::current()->PostTask(
  73       FROM_HERE,
  74       base::Bind(&FileSystemURLRequestJob::StartAsync,
  75                  weak_factory_.GetWeakPtr()));
  76 }
  77
  78 void FileSystemURLRequestJob::Kill() {
  79   reader_.reset();
  80   URLRequestJob::Kill();
  81   weak_factory_.InvalidateWeakPtrs();
  82 }
  83
  84 bool FileSystemURLRequestJob::ReadRawData(net::IOBuffer* dest,
  85                                           int dest_size,
  86                                           int* bytes_read) {
  87   DCHECK_NE(dest_size, 0);
  88   DCHECK(bytes_read);
  89   DCHECK_GE(remaining_bytes_, 0);
  90
  91   if (reader_.get() == NULL)
  92     return false;
  93
  94   if (remaining_bytes_ < dest_size)
  95     dest_size = static_cast<int>(remaining_bytes_);
  96
  97   if (!dest_size) {
  98     *bytes_read = 0;
  99     return true;
 100   }
 101
 102   const int rv = reader_->Read(dest, dest_size,
 103                                base::Bind(&FileSystemURLRequestJob::DidRead,
 104                                           weak_factory_.GetWeakPtr()));
 105   if (rv >= 0) {
 106     // Data is immediately available.
 107     *bytes_read = rv;
 108     remaining_bytes_ -= rv;
 109     DCHECK_GE(remaining_bytes_, 0);
 110     return true;
 111   }
 112   if (rv == net::ERR_IO_PENDING)
 113     SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
 114   else
 115     NotifyFailed(rv);
 116   return false;
 117 }
 118
 119 bool FileSystemURLRequestJob::GetMimeType(std::string* mime_type) const {
 120   DCHECK(request_);
 121   DCHECK(url_.is_valid());
 122   base::FilePath::StringType extension = url_.path().Extension();
 123   if (!extension.empty())
 124     extension = extension.substr(1);
 125   return net::GetWellKnownMimeTypeFromExtension(extension, mime_type);
 126 }
 127
 128 void FileSystemURLRequestJob::SetExtraRequestHeaders(
 129     const net::HttpRequestHeaders& headers) {
 130   std::string range_header;
 131   if (headers.GetHeader(net::HttpRequestHeaders::kRange, &range_header)) {
 132     std::vector<net::HttpByteRange> ranges;
 133     if (net::HttpUtil::ParseRangeHeader(range_header, &ranges)) {
 134       if (ranges.size() == 1) {
 135         byte_range_ = ranges[0];
 136       } else {
 137         // We don't support multiple range requests in one single URL request.
 138         // TODO(adamk): decide whether we want to support multiple range
 139         // requests.
 140         NotifyFailed(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
 141       }
 142     }
 143   }
 144 }
 145
 146 void FileSystemURLRequestJob::GetResponseInfo(net::HttpResponseInfo* info) {
 147   if (response_info_)
 148     *info = *response_info_;
 149 }
 150
 151 int FileSystemURLRequestJob::GetResponseCode() const {
 152   if (response_info_)
 153     return 200;
 154   return URLRequestJob::GetResponseCode();
 155 }
 156
 157 void FileSystemURLRequestJob::StartAsync() {
 158   if (!request_)
 159     return;
 160   DCHECK(!reader_.get());
 161   url_ = file_system_context_->CrackURL(request_->url());
 162   if (!url_.is_valid()) {
 163     file_system_context_->AttemptAutoMountForURLRequest(
 164         request_,
 165         storage_domain_,
 166         base::Bind(&FileSystemURLRequestJob::DidAttemptAutoMount,
 167                    weak_factory_.GetWeakPtr()));
 168     return;
 169   }
 170   if (!file_system_context_->CanServeURLRequest(url_)) {
 171     // In incognito mode the API is not usable and there should be no data.
 172     NotifyFailed(net::ERR_FILE_NOT_FOUND);
 173     return;
 174   }
 175   file_system_context_->operation_runner()->GetMetadata(
 176       url_,
 177       base::Bind(&FileSystemURLRequestJob::DidGetMetadata,
 178                  weak_factory_.GetWeakPtr()));
 179 }
 180
 181 void FileSystemURLRequestJob::DidAttemptAutoMount(base::File::Error result) {
 182   if (result >= 0 &&
 183       file_system_context_->CrackURL(request_->url()).is_valid()) {
 184     StartAsync();
 185   } else {
 186     NotifyFailed(net::ERR_FILE_NOT_FOUND);
 187   }
 188 }
 189
 190 void FileSystemURLRequestJob::DidGetMetadata(
 191     base::File::Error error_code,
 192     const base::File::Info& file_info) {
 193   if (error_code != base::File::FILE_OK) {
 194     NotifyFailed(error_code == base::File::FILE_ERROR_INVALID_URL ?
 195                  net::ERR_INVALID_URL : net::ERR_FILE_NOT_FOUND);
 196     return;
 197   }
 198
 199   // We may have been orphaned...
 200   if (!request_)
 201     return;
 202
 203   is_directory_ = file_info.is_directory;
 204
 205   if (!byte_range_.ComputeBounds(file_info.size)) {
 206     NotifyFailed(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
 207     return;
 208   }
 209
 210   if (is_directory_) {
 211     NotifyHeadersComplete();
 212     return;
 213   }
 214
 215   remaining_bytes_ = byte_range_.last_byte_position() -
 216                      byte_range_.first_byte_position() + 1;
 217   DCHECK_GE(remaining_bytes_, 0);
 218
 219   DCHECK(!reader_.get());
 220   reader_ = file_system_context_->CreateFileStreamReader(
 221       url_, byte_range_.first_byte_position(), remaining_bytes_, base::Time());
 222
 223   set_expected_content_size(remaining_bytes_);
 224   response_info_.reset(new net::HttpResponseInfo());
 225   response_info_->headers = CreateHttpResponseHeaders();
 226   NotifyHeadersComplete();
 227 }
 228
 229 void FileSystemURLRequestJob::DidRead(int result) {
 230   if (result > 0)
 231     SetStatus(URLRequestStatus());  // Clear the IO_PENDING status
 232   else if (result == 0)
 233     NotifyDone(URLRequestStatus());
 234   else
 235     NotifyFailed(result);
 236
 237   remaining_bytes_ -= result;
 238   DCHECK_GE(remaining_bytes_, 0);
 239
 240   NotifyReadComplete(result);
 241 }
 242
 243 bool FileSystemURLRequestJob::IsRedirectResponse(GURL* location,
 244                                                  int* http_status_code) {
 245   if (is_directory_) {
 246     // This happens when we discovered the file is a directory, so needs a
 247     // slash at the end of the path.
 248     std::string new_path = request_->url().path();
 249     new_path.push_back('/');
 250     GURL::Replacements replacements;
 251     replacements.SetPathStr(new_path);
 252     *location = request_->url().ReplaceComponents(replacements);
 253     *http_status_code = 301;  // simulate a permanent redirect
 254     return true;
 255   }
 256
 257   return false;
 258 }
 259
 260 void FileSystemURLRequestJob::NotifyFailed(int rv) {
 261   NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, rv));
 262 }
 263
 264 }  // namespace storage