mojo/fetcher/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/fetcher/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 fetcher {
  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   response_ = URLResponse::New();
  45   response_->url = url_.spec();
  46
  47   // about: URLs other than about:blank are not supported yet.
  48   //
  49   // TODO(yzshen): crbug.com/516494 Eventually we need a general solution to
  50   // generate error page for network errors/unrecognized app format/etc.
  51   response_->status_code = (url_ == GURL(kAboutBlankURL)) ? 200 : 404;
  52
  53   response_->mime_type = "text/html";
  54   PostToRunCallback(true);
  55 }
  56
  57 void AboutFetcher::PostToRunCallback(bool success) {
  58   // Also pass |this| on failure, so that we won't destroy the object while the
  59   // constructor is still on the call stack.
  60   base::MessageLoop::current()->PostTask(
  61       FROM_HERE,
  62       base::Bind(RunFetcherCallback, loader_callback_,
  63                  base::Passed(make_scoped_ptr<Fetcher>(this)), success));
  64 }
  65
  66 const GURL& AboutFetcher::GetURL() const {
  67   return url_;
  68 }
  69
  70 GURL AboutFetcher::GetRedirectURL() const {
  71   return GURL::EmptyGURL();
  72 }
  73
  74 GURL AboutFetcher::GetRedirectReferer() const {
  75   return GURL::EmptyGURL();
  76 }
  77
  78 URLResponsePtr AboutFetcher::AsURLResponse(base::TaskRunner* task_runner,
  79                                            uint32_t skip) {
  80   DCHECK(response_);
  81
  82   // Ignore |skip| because the only URL handled currently is "about:blank" which
  83   // doesn't have a body.
  84   DCHECK(!response_->body.is_valid());
  85
  86   return response_.Pass();
  87 }
  88
  89 void AboutFetcher::AsPath(
  90     base::TaskRunner* task_runner,
  91     base::Callback<void(const base::FilePath&, bool)> callback) {
  92   NOTIMPLEMENTED();
  93   base::MessageLoop::current()->PostTask(
  94       FROM_HERE, base::Bind(callback, base::FilePath(), false));
  95 }
  96
  97 std::string AboutFetcher::MimeType() {
  98   DCHECK(response_);
  99   return response_->mime_type;
 100 }
 101
 102 bool AboutFetcher::HasMojoMagic() {
 103   return false;
 104 }
 105
 106 bool AboutFetcher::PeekFirstLine(std::string* line) {
 107   // The only URL handled currently is "about:blank" which doesn't have a body.
 108   return false;
 109 }
 110
 111 }  // namespace fetcher
 112 }  // namespace mojo