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      1 // Copyright 2014 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/geolocation/simple_geolocation_provider.h"
      6 
      7 #include <algorithm>
      8 #include <iterator>
      9 
     10 #include "base/bind.h"
     11 #include "base/time/time.h"
     12 #include "chrome/browser/chromeos/geolocation/geoposition.h"
     13 #include "net/url_request/url_request_context_getter.h"
     14 #include "url/gurl.h"
     15 
     16 namespace chromeos {
     17 
     18 namespace {
     19 const char kDefaultGeolocationProviderUrl[] =
     20     "https://www.googleapis.com/geolocation/v1/geolocate?";
     21 }  // namespace
     22 
     23 SimpleGeolocationProvider::SimpleGeolocationProvider(
     24     net::URLRequestContextGetter* url_context_getter,
     25     const GURL& url)
     26     : url_context_getter_(url_context_getter), url_(url) {
     27 }
     28 
     29 SimpleGeolocationProvider::~SimpleGeolocationProvider() {
     30   DCHECK(thread_checker_.CalledOnValidThread());
     31 }
     32 
     33 void SimpleGeolocationProvider::RequestGeolocation(
     34     base::TimeDelta timeout,
     35     SimpleGeolocationRequest::ResponseCallback callback) {
     36   DCHECK(thread_checker_.CalledOnValidThread());
     37   SimpleGeolocationRequest* request(
     38       new SimpleGeolocationRequest(url_context_getter_.get(), url_, timeout));
     39   requests_.push_back(request);
     40 
     41   // SimpleGeolocationProvider owns all requests. It is safe to pass unretained
     42   // "this" because destruction of SimpleGeolocationProvider cancels all
     43   // requests.
     44   SimpleGeolocationRequest::ResponseCallback callback_tmp(
     45       base::Bind(&SimpleGeolocationProvider::OnGeolocationResponse,
     46                  base::Unretained(this),
     47                  request,
     48                  callback));
     49   request->MakeRequest(callback_tmp);
     50 }
     51 
     52 // static
     53 GURL SimpleGeolocationProvider::DefaultGeolocationProviderURL() {
     54   return GURL(kDefaultGeolocationProviderUrl);
     55 }
     56 
     57 void SimpleGeolocationProvider::OnGeolocationResponse(
     58     SimpleGeolocationRequest* request,
     59     SimpleGeolocationRequest::ResponseCallback callback,
     60     const Geoposition& geoposition,
     61     bool server_error,
     62     const base::TimeDelta elapsed) {
     63   DCHECK(thread_checker_.CalledOnValidThread());
     64 
     65   callback.Run(geoposition, server_error, elapsed);
     66 
     67   ScopedVector<SimpleGeolocationRequest>::iterator new_end =
     68       std::remove(requests_.begin(), requests_.end(), request);
     69   DCHECK_EQ(std::distance(new_end, requests_.end()), 1);
     70   requests_.erase(new_end, requests_.end());
     71 }
     72 
     73 }  // namespace chromeos
     74