1// Copyright (c) 2011 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 "chrome/browser/chromeos/gview_request_interceptor.h"
6
7#include "base/file_path.h"
8#include "base/memory/singleton.h"
9#include "base/path_service.h"
10#include "chrome/common/chrome_paths.h"
11#include "googleurl/src/gurl.h"
12#include "net/base/escape.h"
13#include "net/base/load_flags.h"
14#include "net/url_request/url_request.h"
15#include "net/url_request/url_request_job.h"
16#include "net/url_request/url_request_redirect_job.h"
17#include "webkit/glue/plugins/plugin_list.h"
18
19namespace chromeos {
20
21// The PDF mime type is treated special if the browser has a built-in
22// PDF viewer plug-in installed - we want to intercept only if we're
23// told to.
24static const char* const kPdfMimeType = "application/pdf";
25
26// This is the list of mime types currently supported by the Google
27// Document Viewer.
28static const char* const supported_mime_type_list[] = {
29  kPdfMimeType,
30  "application/vnd.ms-powerpoint"
31};
32
33static const char* const kGViewUrlPrefix = "http://docs.google.com/gview?url=";
34
35GViewRequestInterceptor::GViewRequestInterceptor() {
36  net::URLRequest::RegisterRequestInterceptor(this);
37  for (size_t i = 0; i < arraysize(supported_mime_type_list); ++i) {
38    supported_mime_types_.insert(supported_mime_type_list[i]);
39  }
40}
41
42GViewRequestInterceptor::~GViewRequestInterceptor() {
43  net::URLRequest::UnregisterRequestInterceptor(this);
44}
45
46net::URLRequestJob* GViewRequestInterceptor::MaybeIntercept(
47    net::URLRequest* request) {
48  // Don't attempt to intercept here as we want to wait until the mime
49  // type is fully determined.
50  return NULL;
51}
52
53net::URLRequestJob* GViewRequestInterceptor::MaybeInterceptResponse(
54    net::URLRequest* request) {
55  // Do not intercept this request if it is a download.
56  if (request->load_flags() & net::LOAD_IS_DOWNLOAD) {
57    return NULL;
58  }
59
60  std::string mime_type;
61  request->GetMimeType(&mime_type);
62  // If the local PDF viewing plug-in is installed and enabled, don't
63  // redirect PDF files to Google Document Viewer.
64  if (mime_type == kPdfMimeType) {
65    FilePath pdf_path;
66    webkit::npapi::WebPluginInfo info;
67    PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_path);
68    if (webkit::npapi::PluginList::Singleton()->GetPluginInfoByPath(
69            pdf_path, &info) &&
70            webkit::npapi::IsPluginEnabled(info))
71      return NULL;
72  }
73  // If supported, build the URL to the Google Document Viewer
74  // including the origial document's URL, then create a new job that
75  // will redirect the browser to this new URL.
76  if (supported_mime_types_.count(mime_type) > 0) {
77    std::string url(kGViewUrlPrefix);
78    url += EscapePath(request->url().spec());
79    return new net::URLRequestRedirectJob(request, GURL(url));
80  }
81  return NULL;
82}
83
84GViewRequestInterceptor* GViewRequestInterceptor::GetInstance() {
85  return Singleton<GViewRequestInterceptor>::get();
86}
87
88}  // namespace chromeos
89