src/chrome/browser/extensions/api/streams_private/streams_private_api.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 "chrome/browser/extensions/api/streams_private/streams_private_api.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/values.h"
   9 #include "chrome/browser/extensions/extension_tab_util.h"
  10 #include "chrome/common/extensions/api/streams_private.h"
  11 #include "content/public/browser/stream_handle.h"
  12 #include "extensions/browser/event_router.h"
  13 #include "extensions/browser/extension_function_registry.h"
  14 #include "extensions/browser/extension_registry.h"
  15 #include "net/http/http_response_headers.h"
  16
  17 namespace {
  18
  19 void CreateResponseHeadersDictionary(const net::HttpResponseHeaders* headers,
  20                                      base::DictionaryValue* result) {
  21   if (!headers)
  22     return;
  23
  24   void* iter = NULL;
  25   std::string header_name;
  26   std::string header_value;
  27   while (headers->EnumerateHeaderLines(&iter, &header_name, &header_value)) {
  28     base::Value* existing_value = NULL;
  29     if (result->Get(header_name, &existing_value)) {
  30       base::StringValue* existing_string_value =
  31           static_cast<base::StringValue*>(existing_value);
  32       existing_string_value->GetString()->append(", ").append(header_value);
  33     } else {
  34       result->SetString(header_name, header_value);
  35     }
  36   }
  37 }
  38
  39 }  // namespace
  40
  41 namespace extensions {
  42
  43 namespace streams_private = api::streams_private;
  44
  45 // static
  46 StreamsPrivateAPI* StreamsPrivateAPI::Get(content::BrowserContext* context) {
  47   return GetFactoryInstance()->Get(context);
  48 }
  49
  50 StreamsPrivateAPI::StreamsPrivateAPI(content::BrowserContext* context)
  51     : browser_context_(context),
  52       weak_ptr_factory_(this),
  53       extension_registry_observer_(this) {
  54   extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
  55 }
  56
  57 StreamsPrivateAPI::~StreamsPrivateAPI() {
  58 }
  59
  60 void StreamsPrivateAPI::ExecuteMimeTypeHandler(
  61     const std::string& extension_id,
  62     content::WebContents* web_contents,
  63     scoped_ptr<content::StreamHandle> stream,
  64     int64 expected_content_size) {
  65   // Create the event's arguments value.
  66   streams_private::StreamInfo info;
  67   info.mime_type = stream->GetMimeType();
  68   info.original_url = stream->GetOriginalURL().spec();
  69   info.stream_url = stream->GetURL().spec();
  70   info.tab_id = ExtensionTabUtil::GetTabId(web_contents);
  71
  72   int size = -1;
  73   if (expected_content_size <= INT_MAX)
  74     size = expected_content_size;
  75   info.expected_content_size = size;
  76
  77   CreateResponseHeadersDictionary(stream->GetResponseHeaders().get(),
  78                                   &info.response_headers.additional_properties);
  79
  80   scoped_ptr<Event> event(
  81       new Event(streams_private::OnExecuteMimeTypeHandler::kEventName,
  82                 streams_private::OnExecuteMimeTypeHandler::Create(info)));
  83
  84   EventRouter::Get(browser_context_)
  85       ->DispatchEventToExtension(extension_id, event.Pass());
  86
  87   GURL url = stream->GetURL();
  88   streams_[extension_id][url] = make_linked_ptr(stream.release());
  89 }
  90
  91 void StreamsPrivateAPI::OnExtensionUnloaded(
  92     content::BrowserContext* browser_context,
  93     const Extension* extension,
  94     UnloadedExtensionInfo::Reason reason) {
  95   streams_.erase(extension->id());
  96 }
  97
  98 static base::LazyInstance<BrowserContextKeyedAPIFactory<StreamsPrivateAPI> >
  99     g_factory = LAZY_INSTANCE_INITIALIZER;
 100
 101 // static
 102 BrowserContextKeyedAPIFactory<StreamsPrivateAPI>*
 103 StreamsPrivateAPI::GetFactoryInstance() {
 104   return g_factory.Pointer();
 105 }
 106
 107 }  // namespace extensions