mojo/runner/about_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/runner/about_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_path.h"
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/message_loop/message_loop.h"
  12
  13 namespace mojo {
  14 namespace runner {
  15 namespace {
  16
  17 void RunFetcherCallback(const shell::Fetcher::FetchCallback& callback,
  18                         scoped_ptr<shell::Fetcher> fetcher,
  19                         bool success) {
  20   callback.Run(success ? fetcher.Pass() : nullptr);
  21 }
  22
  23 }  // namespace
  24
  25 const char AboutFetcher::kAboutScheme[] = "about";
  26 const char AboutFetcher::kAboutBlankURL[] = "about:blank";
  27
  28 // static
  29 void AboutFetcher::Start(const GURL& url,
  30                          const FetchCallback& loader_callback) {
  31   // The object manages its own lifespan.
  32   new AboutFetcher(url, loader_callback);
  33 }
  34
  35 AboutFetcher::AboutFetcher(const GURL& url,
  36                            const FetchCallback& loader_callback)
  37     : Fetcher(loader_callback), url_(url) {
  38   BuildResponse();
  39 }
  40
  41 AboutFetcher::~AboutFetcher() {}
  42
  43 void AboutFetcher::BuildResponse() {
  44   if (url_ != GURL(kAboutBlankURL)) {
  45     PostToRunCallback(false);
  46     return;
  47   }
  48
  49   response_ = URLResponse::New();
  50   response_->url = kAboutBlankURL;
  51   response_->status_code = 200;
  52   response_->mime_type = "text/html";
  53   PostToRunCallback(true);
  54 }
  55
  56 void AboutFetcher::PostToRunCallback(bool success) {
  57   // Also pass |this| on failure, so that we won't destroy the object while the
  58   // constructor is still on the call stack.
  59   base::MessageLoop::current()->PostTask(
  60       FROM_HERE,
  61       base::Bind(RunFetcherCallback, loader_callback_,
  62                  base::Passed(make_scoped_ptr<Fetcher>(this)), success));
  63 }
  64
  65 const GURL& AboutFetcher::GetURL() const {
  66   return url_;
  67 }
  68
  69 GURL AboutFetcher::GetRedirectURL() const {
  70   return GURL::EmptyGURL();
  71 }
  72
  73 GURL AboutFetcher::GetRedirectReferer() const {
  74   return GURL::EmptyGURL();
  75 }
  76
  77 URLResponsePtr AboutFetcher::AsURLResponse(base::TaskRunner* task_runner,
  78                                            uint32_t skip) {
  79   DCHECK(response_);
  80
  81   // Ignore |skip| because the only URL handled currently is "about:blank" which
  82   // doesn't have a body.
  83   DCHECK(!response_->body.is_valid());
  84
  85   return response_.Pass();
  86 }
  87
  88 void AboutFetcher::AsPath(
  89     base::TaskRunner* task_runner,
  90     base::Callback<void(const base::FilePath&, bool)> callback) {
  91   NOTIMPLEMENTED();
  92   base::MessageLoop::current()->PostTask(
  93       FROM_HERE, base::Bind(callback, base::FilePath(), false));
  94 }
  95
  96 std::string AboutFetcher::MimeType() {
  97   DCHECK(response_);
  98   return response_->mime_type;
  99 }
 100
 101 bool AboutFetcher::HasMojoMagic() {
 102   return false;
 103 }
 104
 105 bool AboutFetcher::PeekFirstLine(std::string* line) {
 106   // The only URL handled currently is "about:blank" which doesn't have a body.
 107   return false;
 108 }
 109
 110 }  // namespace runner
 111 }  // namespace mojo