mojo/shell/local_fetcher.cc

   1 // Copyright 2015 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 "mojo/shell/local_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_util.h"
   9 #include "base/format_macros.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/trace_event/trace_event.h"
  13 #include "mojo/common/common_type_converters.h"
  14 #include "mojo/common/data_pipe_utils.h"
  15 #include "mojo/common/url_type_converters.h"
  16 #include "mojo/util/filename_util.h"
  17 #include "url/url_util.h"
  18
  19 namespace mojo {
  20 namespace shell {
  21
  22 namespace {
  23
  24 void IgnoreResult(bool result) {
  25 }
  26
  27 }  // namespace
  28
  29 // A loader for local files.
  30 LocalFetcher::LocalFetcher(const GURL& url,
  31                            const GURL& url_without_query,
  32                            const FetchCallback& loader_callback)
  33     : Fetcher(loader_callback),
  34       url_(url),
  35       path_(util::UrlToFilePath(url_without_query)) {
  36   TRACE_EVENT1("mojo_shell", "LocalFetcher::LocalFetcher", "url", url.spec());
  37   loader_callback_.Run(make_scoped_ptr(this));
  38 }
  39
  40 const GURL& LocalFetcher::GetURL() const {
  41   return url_;
  42 }
  43
  44 GURL LocalFetcher::GetRedirectURL() const {
  45   return GURL::EmptyGURL();
  46 }
  47
  48 GURL LocalFetcher::GetRedirectReferer() const {
  49   return GURL::EmptyGURL();
  50 }
  51
  52 URLResponsePtr LocalFetcher::AsURLResponse(base::TaskRunner* task_runner,
  53                                            uint32_t skip) {
  54   URLResponsePtr response(URLResponse::New());
  55   response->url = String::From(url_);
  56   DataPipe data_pipe;
  57   response->body = data_pipe.consumer_handle.Pass();
  58   int64 file_size;
  59   if (base::GetFileSize(path_, &file_size)) {
  60     response->headers = Array<HttpHeaderPtr>(1);
  61     HttpHeaderPtr header = HttpHeader::New();
  62     header->name = "Content-Length";
  63     header->value = base::StringPrintf("%" PRId64, file_size);
  64     response->headers[0] = header.Pass();
  65   }
  66   common::CopyFromFile(path_, data_pipe.producer_handle.Pass(), skip,
  67                        task_runner, base::Bind(&IgnoreResult));
  68   return response.Pass();
  69 }
  70
  71 void LocalFetcher::AsPath(
  72     base::TaskRunner* task_runner,
  73     base::Callback<void(const base::FilePath&, bool)> callback) {
  74   // Async for consistency with network case.
  75   base::MessageLoop::current()->PostTask(
  76       FROM_HERE, base::Bind(callback, path_, base::PathExists(path_)));
  77 }
  78
  79 std::string LocalFetcher::MimeType() {
  80   return "";
  81 }
  82
  83 bool LocalFetcher::HasMojoMagic() {
  84   std::string magic;
  85   ReadFileToString(path_, &magic, strlen(kMojoMagic));
  86   return magic == kMojoMagic;
  87 }
  88
  89 bool LocalFetcher::PeekFirstLine(std::string* line) {
  90   std::string start_of_file;
  91   ReadFileToString(path_, &start_of_file, kMaxShebangLength);
  92   size_t return_position = start_of_file.find('\n');
  93   if (return_position == std::string::npos)
  94     return false;
  95   *line = start_of_file.substr(0, return_position + 1);
  96   return true;
  97 }
  98
  99 }  // namespace shell
 100 }  // namespace mojo