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Issue 23458016: Added probe to determine if data reduction proxy can be used (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Addressed comments Created 7 years, 2 months ago
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1 // Copyright 2013 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/net/spdyproxy/data_reduction_proxy_settings_android.h"
6
7 #include "base/android/build_info.h"
8 #include "base/android/jni_android.h"
9 #include "base/android/jni_string.h"
10 #include "base/base64.h"
11 #include "base/bind.h"
12 #include "base/command_line.h"
13 #include "base/metrics/field_trial.h"
14 #include "base/metrics/histogram.h"
15 #include "base/prefs/pref_member.h"
16 #include "base/prefs/pref_service.h"
17 #include "base/strings/string_number_conversions.h"
18 #include "base/strings/string_util.h"
19 #include "base/strings/stringprintf.h"
20 #include "base/strings/utf_string_conversions.h"
21 #include "chrome/browser/browser_process.h"
22 #include "chrome/browser/prefs/proxy_prefs.h"
23 #include "chrome/browser/prefs/scoped_user_pref_update.h"
24 #include "chrome/browser/profiles/profile.h"
25 #include "chrome/browser/profiles/profile_manager.h"
26 #include "chrome/common/chrome_switches.h"
27 #include "chrome/common/pref_names.h"
28 #include "jni/DataReductionProxySettingsAndroid_jni.h"
29 #include "net/base/host_port_pair.h"
30 #include "net/base/load_flags.h"
31 #include "net/base/net_errors.h"
32 #include "net/url_request/url_fetcher.h"
33 #include "net/url_request/url_fetcher_delegate.h"
34 #include "net/url_request/url_request_status.h"
35 #include "url/gurl.h"
36
37 using base::android::CheckException;
38 using base::android::ConvertJavaStringToUTF8;
39 using base::android::ConvertUTF8ToJavaString;
40 using base::android::ScopedJavaLocalRef;
41 using base::FieldTrialList;
42 using base::StringPrintf;
43
44
45 namespace {
46
47 // The C++ definition of enum SpdyProxyAuthState defined in
48 // tools/histograms/histograms.xml.
49 // New values should be added at the end before |NUM_SPDY_PROXY_AUTH_STATE|.
50 enum {
51 CHROME_STARTUP,
52 SPDY_PROXY_AUTH_ON_AT_STARTUP,
53 SPDY_PROXY_AUTH_ON_BY_USER,
54 SPDY_PROXY_AUTH_OFF_BY_USER,
55 // Used by UMA histograms and should always be the last value.
56 NUM_SPDY_PROXY_AUTH_STATE
57 };
58
59 const char kEnabled[] = "Enabled";
60
61 bool IsProxyOriginSetOnCommandLine() {
62 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
63 if (command_line.HasSwitch(switches::kSpdyProxyAuthOrigin)) {
nyquist 2013/10/02 16:36:22 Nit: return command_line.HasSwitch(switches::kSpdy
bengr 2013/10/04 23:14:43 Done.
64 return true;
65 }
66 return false;
67 }
68
69 bool IsProxyAllowed() {
70 return IsProxyOriginSetOnCommandLine() ||
71 (FieldTrialList::FindFullName("DataCompressionProxyRollout") == kEnabled);
72 }
73
74 bool IsProxyPromoAllowed() {
75 return IsProxyOriginSetOnCommandLine() ||
76 (IsProxyAllowed() &&
77 FieldTrialList::FindFullName("DataCompressionProxyPromoVisibility") ==
78 kEnabled);
79 }
80
81 int64 GetInt64PrefValue(const ListValue& list_value, size_t index) {
82 int64 val = 0;
83 std::string pref_value;
84 bool rv = list_value.GetString(index, &pref_value);
85 DCHECK(rv);
86 if (rv) {
87 rv = base::StringToInt64(pref_value, &val);
88 DCHECK(rv);
89 }
90 return val;
91 }
92
93 std::string GetProxyCheckURL(){
94 if (!IsProxyAllowed())
95 return std::string();
96 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
97 if (command_line.HasSwitch(switches::kDataReductionProxyProbeURL)) {
98 return command_line.GetSwitchValueASCII(switches::kSpdyProxyAuthOrigin);
99 }
100 #if defined(DATA_REDUCTION_PROXY_PROBE_URL)
101 return DATA_REDUCTION_PROXY_PROBE_URL;
102 #else
103 return std::string();
104 #endif
105 }
106
107 std::string GetDataReductionProxyOriginInternal() {
108 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
109 if (command_line.HasSwitch(switches::kSpdyProxyAuthOrigin)) {
110 return command_line.GetSwitchValueASCII(switches::kSpdyProxyAuthOrigin);
111 }
112 #if defined(SPDY_PROXY_AUTH_ORIGIN)
113 return SPDY_PROXY_AUTH_ORIGIN;
114 #else
115 return std::string();
116 #endif
117 }
118
119 std::string GetDataReductionProxyOriginHostPort() {
120 std::string spdy_proxy = GetDataReductionProxyOriginInternal();
121 if (spdy_proxy.empty()) {
122 DLOG(ERROR) << "A SPDY proxy has not been set.";
123 return spdy_proxy;
124 }
125 // Remove a trailing slash from the proxy string if one exists as well as
126 // leading HTTPS scheme.
127 return net::HostPortPair::FromURL(GURL(spdy_proxy)).ToString();
128 }
129
130 } // namespace
131
132
133 DataReductionProxySettingsAndroid::DataReductionProxySettingsAndroid(
134 JNIEnv* env, jobject obj)
135 : has_turned_on_(false),
136 has_turned_off_(false),
137 disabled_by_carrier_(false),
138 enabled_by_user_(false) {
139 }
140
141 DataReductionProxySettingsAndroid::~DataReductionProxySettingsAndroid() {
142 if (IsProxyAllowed())
143 spdy_proxy_auth_enabled_.Destroy();
144 }
145
146 void DataReductionProxySettingsAndroid::InitPrefMembers() {
147 spdy_proxy_auth_enabled_.Init(
148 prefs::kSpdyProxyAuthEnabled,
149 GetOriginalProfilePrefs(),
150 base::Bind(&DataReductionProxySettingsAndroid::OnProxyEnabledPrefChange,
151 base::Unretained(this)));
152 }
153
154 void DataReductionProxySettingsAndroid::InitDataReductionProxySettings(
155 JNIEnv* env,
156 jobject obj) {
157 // Disable the proxy if it is not allowed to be used.
158 if (!IsProxyAllowed())
159 return;
160
161 InitPrefMembers();
162
163 AddDefaultProxyBypassRules();
164 net::NetworkChangeNotifier::AddIPAddressObserver(this);
165
166 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
167
168 // Setting the kEnableSpdyProxyAuth switch has the same effect as enabling
169 // the feature via settings, in that once set, the preference will be sticky
170 // across instances of Chrome. Disabling the feature can only be done through
171 // the settings menu.
172 UMA_HISTOGRAM_ENUMERATION("SpdyProxyAuth.State", CHROME_STARTUP,
173 NUM_SPDY_PROXY_AUTH_STATE);
174 if (spdy_proxy_auth_enabled_.GetValue() ||
175 command_line.HasSwitch(switches::kEnableSpdyProxyAuth)) {
176 MaybeActivateDataReductionProxy(true);
177 } else {
178 LOG(WARNING) << "SPDY proxy OFF at startup.";
179 }
180 }
181
182 void DataReductionProxySettingsAndroid::BypassHostPattern(
183 JNIEnv* env, jobject obj, jstring pattern) {
184 AddHostPatternToBypass(ConvertJavaStringToUTF8(env, pattern));
185 }
186 void DataReductionProxySettingsAndroid::BypassURLPattern(
187 JNIEnv* env, jobject obj, jstring pattern) {
188 AddURLPatternToBypass(ConvertJavaStringToUTF8(env, pattern));
189 }
190
191 jboolean DataReductionProxySettingsAndroid::IsDataReductionProxyAllowed(
192 JNIEnv* env, jobject obj) {
193 return IsProxyAllowed();
194 }
195
196 jboolean DataReductionProxySettingsAndroid::IsDataReductionProxyPromoAllowed(
197 JNIEnv* env, jobject obj) {
198 return IsProxyPromoAllowed();
199 }
200
201 ScopedJavaLocalRef<jstring>
202 DataReductionProxySettingsAndroid::GetDataReductionProxyOrigin(
203 JNIEnv* env, jobject obj) {
204 return ConvertUTF8ToJavaString(env, GetDataReductionProxyOriginInternal());
205 }
206
207 ScopedJavaLocalRef<jstring>
208 DataReductionProxySettingsAndroid::GetDataReductionProxyAuth(
209 JNIEnv* env, jobject obj) {
210 if (!IsProxyAllowed())
211 return ConvertUTF8ToJavaString(env, std::string());
212 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
213 if (command_line.HasSwitch(switches::kSpdyProxyAuthOrigin)) {
214 // If an origin is provided via a switch, then only consider the value
215 // that is provided by a switch. Do not use the preprocessor constant.
216 // Don't expose SPDY_PROXY_AUTH_VALUE to a proxy passed in via the command
217 // line.
218 if (command_line.HasSwitch(switches::kSpdyProxyAuthValue)) {
219 return ConvertUTF8ToJavaString(
220 env,
221 command_line.GetSwitchValueASCII(switches::kSpdyProxyAuthValue));
222 }
223 return ConvertUTF8ToJavaString(env, std::string());
224 }
225 #if defined(SPDY_PROXY_AUTH_VALUE)
226 return ConvertUTF8ToJavaString(env, SPDY_PROXY_AUTH_VALUE);
227 #else
228 return ConvertUTF8ToJavaString(env, std::string());
229 #endif
230 }
231
232 jboolean DataReductionProxySettingsAndroid::IsDataReductionProxyEnabled(
233 JNIEnv* env, jobject obj) {
234 return spdy_proxy_auth_enabled_.GetValue();
235 }
236
237 jboolean DataReductionProxySettingsAndroid::IsDataReductionProxyManaged(
238 JNIEnv* env, jobject obj) {
239 return spdy_proxy_auth_enabled_.IsManaged();
240 }
241
242 void DataReductionProxySettingsAndroid::SetDataReductionProxyEnabled(
243 JNIEnv* env,
244 jobject obj,
245 jboolean enabled) {
246 // Prevent configuring the proxy when it is not allowed to be used.
247 if (!IsProxyAllowed())
248 return;
249
250 spdy_proxy_auth_enabled_.SetValue(enabled);
251 OnProxyEnabledPrefChange();
252 }
253
254 jlong DataReductionProxySettingsAndroid::GetDataReductionLastUpdateTime(
255 JNIEnv* env, jobject obj) {
256 PrefService* local_state = GetLocalStatePrefs();
257 int64 last_update_internal =
258 local_state->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
259 base::Time last_update = base::Time::FromInternalValue(last_update_internal);
260 return static_cast<int64>(last_update.ToJsTime());
261 }
262
263 base::android::ScopedJavaLocalRef<jobject>
264 DataReductionProxySettingsAndroid::GetContentLengths(JNIEnv* env,
265 jobject obj) {
266 int64 original_content_length;
267 int64 received_content_length;
268 int64 last_update_internal;
269 GetContentLengthsInternal(spdyproxy::kNumDaysInHistorySummary,
270 &original_content_length,
271 &received_content_length,
272 &last_update_internal);
273
274 return Java_ContentLengths_create(env,
275 original_content_length,
276 received_content_length);
277 }
278
279 ScopedJavaLocalRef<jlongArray>
280 DataReductionProxySettingsAndroid::GetDailyOriginalContentLengths(
281 JNIEnv* env, jobject obj) {
282 return GetDailyContentLengths(env, prefs::kDailyHttpOriginalContentLength);
283 }
284
285 ScopedJavaLocalRef<jlongArray>
286 DataReductionProxySettingsAndroid::GetDailyReceivedContentLengths(
287 JNIEnv* env, jobject obj) {
288 return GetDailyContentLengths(env, prefs::kDailyHttpReceivedContentLength);
289 }
290
291 // static
292 bool DataReductionProxySettingsAndroid::Register(JNIEnv* env) {
293 bool register_natives_impl_result = RegisterNativesImpl(env);
294 return register_natives_impl_result;
295 }
296
297 void DataReductionProxySettingsAndroid::OnURLFetchComplete(
298 const net::URLFetcher* source) {
299 net::URLRequestStatus status = source->GetStatus();
300 if (status.status() == net::URLRequestStatus::FAILED &&
301 status.error() == net::ERR_INTERNET_DISCONNECTED) {
302 return;
303 }
304
305 std::string response;
306 source->GetResponseAsString(&response);
307
308 if ("OK" == response.substr(0, 2)) {
309 DVLOG(1) << "The data reduction proxy is not blocked.";
310
311 if (enabled_by_user_ && disabled_by_carrier_) {
312 // The user enabled the proxy, but sometime previously in the session,
313 // the network operator had blocked the proxy. Now that the network
314 // operator is unblocking it, configure it to the user's desires.
315 SetProxyPac(true, false);
316 }
317 disabled_by_carrier_ = false;
318 return;
319 }
320 DVLOG(1) << "The data reduction proxy is blocked.";
321
322 if (enabled_by_user_ && !disabled_by_carrier_) {
323 // Disable the proxy.
324 SetProxyPac(false, false);
325 }
326 disabled_by_carrier_ = true;
327 }
328
329 void DataReductionProxySettingsAndroid::OnIPAddressChanged() {
330 LOG(WARNING) << "In OnIPAddressChanged";
mmenke 2013/09/27 17:10:14 Do we need all these LOGs? Prefer to remove them
bengr 2013/10/04 23:14:43 Done. Leaving those in was a mistake.
331 if (enabled_by_user_) {
332 LOG(WARNING) << "Enabled by user";
333 DCHECK(IsProxyAllowed());
334 ProbeWhetherDataReductionProxyIsAvailable();
335 }
336 }
337
338 void DataReductionProxySettingsAndroid::OnProxyEnabledPrefChange() {
339 LOG(WARNING) << "In OnProxyEnabledPrefChange";
340 if (!IsProxyAllowed())
341 return;
342 LOG(WARNING) << "Got past IsProxyAllowed";
343 MaybeActivateDataReductionProxy(false);
344 }
345
346 void DataReductionProxySettingsAndroid::AddDefaultProxyBypassRules() {
347 // localhost
348 AddHostToBypass("localhost");
349 AddHostPatternToBypass("localhost.*");
350 AddHostToBypass("127.0.0.1");
351 AddHostToBypass("::1");
352 // TODO(bengr): revisit 192.168.*, 10.*, 172.16.0.0 - 172.31.255.255. The
353 // concern was that adding these and other rules would add to the processing
354 // time.
355
356 // TODO(bengr): See http://crbug.com/169959. For some reason the data
357 // reduction proxy is breaking the omnibox SearchProvider. Remove this rule
358 // when this is fixed.
359 AddURLPatternToBypass("http://www.google.com/complete/search*");
360
361 // Check for proxy availability
362 std::string proxy_check_url = GetProxyCheckURL();
363 if (!proxy_check_url.empty()) {
364 AddURLPatternToBypass(GetProxyCheckURL());
365 }
366 }
367
368 void DataReductionProxySettingsAndroid::AddURLPatternToBypass(
369 const std::string& pattern) {
370 AddPatternToBypass("url", pattern);
371 }
372
373 void DataReductionProxySettingsAndroid::AddHostPatternToBypass(
374 const std::string& pattern) {
375 AddPatternToBypass("host", pattern);
376 }
377
378 void DataReductionProxySettingsAndroid::AddPatternToBypass(
379 const std::string& url_or_host,
380 const std::string& pattern) {
381 bypass_rules_.push_back(
382 StringPrintf("shExpMatch(%s, '%s')",
383 url_or_host.c_str(), pattern.c_str()));
384 }
385
386 void DataReductionProxySettingsAndroid::AddHostToBypass(
387 const std::string& host) {
388 bypass_rules_.push_back(
389 StringPrintf("host == '%s'", host.c_str()));
390 }
391
392 PrefService* DataReductionProxySettingsAndroid::GetOriginalProfilePrefs() {
393 return g_browser_process->profile_manager()->GetDefaultProfile()->
394 GetOriginalProfile()->GetPrefs();
395 }
396
397 PrefService* DataReductionProxySettingsAndroid::GetLocalStatePrefs() {
398 return g_browser_process->local_state();
399 }
400
401 void DataReductionProxySettingsAndroid::ResetDataReductionStatistics() {
402 PrefService* prefs = GetLocalStatePrefs();
403 if (!prefs)
404 return;
405 ListPrefUpdate original_update(prefs, prefs::kDailyHttpOriginalContentLength);
406 ListPrefUpdate received_update(prefs, prefs::kDailyHttpReceivedContentLength);
407 original_update->Clear();
408 received_update->Clear();
409 for (size_t i = 0; i < spdyproxy::kNumDaysInHistory; ++i) {
410 original_update->AppendString(base::Int64ToString(0));
411 received_update->AppendString(base::Int64ToString(0));
412 }
413 }
414
415 void DataReductionProxySettingsAndroid::MaybeActivateDataReductionProxy(
416 bool at_startup) {
417 PrefService* prefs = GetOriginalProfilePrefs();
418
419 if (spdy_proxy_auth_enabled_.GetValue() &&
420 !prefs->GetBoolean(prefs::kSpdyProxyAuthWasEnabledBefore)) {
421 prefs->SetBoolean(prefs::kSpdyProxyAuthWasEnabledBefore, true);
422 ResetDataReductionStatistics();
423 }
424
425 std::string spdy_proxy_origin = GetDataReductionProxyOriginHostPort();
426
427 // Configure use of the data reduction proxy if it is enabled and the proxy
428 // origin is non-empty.
429 enabled_by_user_=
430 spdy_proxy_auth_enabled_.GetValue() && !spdy_proxy_origin.empty();
431 SetProxyPac(enabled_by_user_ && !disabled_by_carrier_, at_startup);
432
433 // Check if the proxy has been disabled explicitly by the carrier.
434 if (enabled_by_user_)
435 ProbeWhetherDataReductionProxyIsAvailable();
436 }
437
438 void DataReductionProxySettingsAndroid::SetProxyPac(bool enable_spdy_proxy,
439 bool at_startup) {
440 PrefService* prefs = GetOriginalProfilePrefs();
441 DCHECK(prefs);
442 // Keys duplicated from proxy_config_dictionary.cc
443 // TODO(bengr): Move these to proxy_config_dictionary.h and reuse them here.
444 const char kProxyMode[] = "mode";
445 const char kProxyPacURL[] = "pac_url";
446 const char kAtStartup[] = "at startup";
447 const char kByUser[] = "by user action";
448
449 DictionaryPrefUpdate update(prefs, prefs::kProxy);
450 DictionaryValue* dict = update.Get();
451 if (enable_spdy_proxy) {
452 LOG(WARNING) << "SPDY proxy ON " << (at_startup ? kAtStartup : kByUser);
453 // Convert to a data URI and update the PAC settings.
454 std::string base64_pac;
455 base::Base64Encode(GetProxyPacScript(), &base64_pac);
456
457 dict->SetString(kProxyPacURL,
458 "data:application/x-ns-proxy-autoconfig;base64," +
459 base64_pac);
460 dict->SetString(kProxyMode,
461 ProxyModeToString(ProxyPrefs::MODE_PAC_SCRIPT));
462
463 if (at_startup) {
464 UMA_HISTOGRAM_ENUMERATION("SpdyProxyAuth.State",
465 SPDY_PROXY_AUTH_ON_AT_STARTUP,
466 NUM_SPDY_PROXY_AUTH_STATE);
467 } else if (!has_turned_on_) {
468 // SPDY proxy auth is turned on by user action for the first time in
469 // this session.
470 UMA_HISTOGRAM_ENUMERATION("SpdyProxyAuth.State",
471 SPDY_PROXY_AUTH_ON_BY_USER,
472 NUM_SPDY_PROXY_AUTH_STATE);
473 has_turned_on_ = true;
474 }
475 } else {
476 LOG(WARNING) << "SPDY proxy OFF " << (at_startup ? kAtStartup : kByUser);
477 dict->SetString(kProxyMode, ProxyModeToString(ProxyPrefs::MODE_SYSTEM));
478 dict->SetString(kProxyPacURL, "");
479
480 if (!at_startup && !has_turned_off_) {
481 UMA_HISTOGRAM_ENUMERATION("SpdyProxyAuth.State",
482 SPDY_PROXY_AUTH_OFF_BY_USER,
483 NUM_SPDY_PROXY_AUTH_STATE);
484 has_turned_off_ = true;
485 }
486 }
487 }
488
489 ScopedJavaLocalRef<jlongArray>
490 DataReductionProxySettingsAndroid::GetDailyContentLengths(
491 JNIEnv* env, const char* pref_name) {
492 jlongArray result = env->NewLongArray(spdyproxy::kNumDaysInHistory);
493 PrefService* local_state = GetLocalStatePrefs();
494 if (!local_state)
495 return ScopedJavaLocalRef<jlongArray>(env, result);
496
497 const ListValue* list_value = local_state->GetList(pref_name);
498 if (list_value->GetSize() != spdyproxy::kNumDaysInHistory)
499 return ScopedJavaLocalRef<jlongArray>(env, result);
500
501 jlong jval[spdyproxy::kNumDaysInHistory];
502 for (size_t i = 0; i < spdyproxy::kNumDaysInHistory; ++i) {
503 jval[i] = GetInt64PrefValue(*list_value, i);
504 }
505 env->SetLongArrayRegion(result, 0, spdyproxy::kNumDaysInHistory, jval);
506 return ScopedJavaLocalRef<jlongArray>(env, result);
507 }
508
509 void DataReductionProxySettingsAndroid::GetContentLengthsInternal(
510 unsigned int days,
511 int64* original_content_length,
512 int64* received_content_length,
513 int64* last_update_time) {
514 DCHECK_LE(days, spdyproxy::kNumDaysInHistory);
515 PrefService* local_state = GetLocalStatePrefs();
516 if (!local_state) {
517 *original_content_length = 0L;
518 *received_content_length = 0L;
519 *last_update_time = 0L;
520 return;
521 }
522
523 const ListValue* original_list =
524 local_state->GetList(prefs::kDailyHttpOriginalContentLength);
525 const ListValue* received_list =
526 local_state->GetList(prefs::kDailyHttpReceivedContentLength);
527
528 if (original_list->GetSize() != spdyproxy::kNumDaysInHistory ||
529 received_list->GetSize() != spdyproxy::kNumDaysInHistory) {
530 *original_content_length = 0L;
531 *received_content_length = 0L;
532 *last_update_time = 0L;
533 return;
534 }
535
536 int64 orig = 0L;
537 int64 recv = 0L;
538 // Include days from the end of the list going backwards.
539 for (size_t i = spdyproxy::kNumDaysInHistory - days;
540 i < spdyproxy::kNumDaysInHistory; ++i) {
541 orig += GetInt64PrefValue(*original_list, i);
542 recv += GetInt64PrefValue(*received_list, i);
543 }
544 *original_content_length = orig;
545 *received_content_length = recv;
546 *last_update_time =
547 local_state->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
548 }
549
550 net::URLFetcher* DataReductionProxySettingsAndroid::GetURLFetcher() {
551 std::string url = GetProxyCheckURL();
552 if (url.empty())
553 return NULL;
554 net::URLFetcher* fetcher = net::URLFetcher::Create(GURL(url),
555 net::URLFetcher::GET,
556 this);
557 fetcher->SetLoadFlags(net::LOAD_DISABLE_CACHE);
558 Profile* profile = g_browser_process->profile_manager()->
559 GetDefaultProfile();
560 fetcher->SetRequestContext(profile->GetRequestContext());
561 // Configure max retries to be at most kMaxRetries times for 5xx errors.
562 static const int kMaxRetries = 5;
563 fetcher->SetMaxRetriesOn5xx(kMaxRetries);
564 return fetcher;
565 }
566
567 void
568 DataReductionProxySettingsAndroid::ProbeWhetherDataReductionProxyIsAvailable() {
569 LOG(WARNING) << "Getting fetcher...";
570 net::URLFetcher* fetcher = GetURLFetcher();
571 if (!fetcher)
572 return;
573 fetcher_.reset(fetcher);
574 fetcher_->Start();
575 }
576
577 // TODO(bengr): Replace with our own ProxyResolver.
578 std::string DataReductionProxySettingsAndroid::GetProxyPacScript() {
579 std::string bypass_clause = "(" + JoinString(bypass_rules_, ") || (") + ")";
580
581 // Generate a proxy PAC that falls back to direct loading when the proxy is
582 // unavailable and only process HTTP traffic. (With a statically configured
583 // proxy, proxy failures will simply result in a connection error presented to
584 // users.)
585
586 std::string pac = "function FindProxyForURL(url, host) {"
587 " if (" + bypass_clause + ") {"
588 " return 'DIRECT';"
589 " } "
590 " if (url.substring(0, 5) == 'http:') {"
591 " return 'HTTPS " + GetDataReductionProxyOriginHostPort() +
592 "; DIRECT';"
593 " }"
594 " return 'DIRECT';"
595 "}";
596 return pac;
597 }
598
599 // Used by generated jni code.
600 static jint Init(JNIEnv* env, jobject obj) {
601 DataReductionProxySettingsAndroid* settings =
602 new DataReductionProxySettingsAndroid(env, obj);
603 return reinterpret_cast<jint>(settings);
604 }
605
606
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