1 /*
2 * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
3 * Copyright (C) 2010 Apple Inc. All rights reserved.
4 * Copyright (C) 2011, Code Aurora Forum. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in the documentation and/or other materials provided with the
15 * distribution.
16 * 3. Neither the name of Ericsson nor the names of its contributors
17 * may be used to endorse or promote products derived from this
18 * software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include "third_party/blink/renderer/modules/eventsource/event_source.h"
34
35 #include <memory>
36
37 #include "third_party/blink/public/platform/task_type.h"
38 #include "third_party/blink/public/platform/web_url_request.h"
39 #include "third_party/blink/renderer/bindings/core/v8/script_controller.h"
40 #include "third_party/blink/renderer/bindings/core/v8/serialization/serialized_script_value.h"
41 #include "third_party/blink/renderer/bindings/core/v8/serialization/serialized_script_value_factory.h"
42 #include "third_party/blink/renderer/bindings/modules/v8/v8_event_source_init.h"
43 #include "third_party/blink/renderer/core/dom/events/event.h"
44 #include "third_party/blink/renderer/core/events/message_event.h"
45 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
46 #include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
47 #include "third_party/blink/renderer/core/frame/local_dom_window.h"
48 #include "third_party/blink/renderer/core/frame/local_frame.h"
49 #include "third_party/blink/renderer/core/inspector/console_message.h"
50 #include "third_party/blink/renderer/core/loader/threadable_loader.h"
51 #include "third_party/blink/renderer/core/probe/core_probes.h"
52 #include "third_party/blink/renderer/platform/bindings/exception_state.h"
53 #include "third_party/blink/renderer/platform/heap/heap.h"
54 #include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
55 #include "third_party/blink/renderer/platform/loader/fetch/resource_error.h"
56 #include "third_party/blink/renderer/platform/loader/fetch/resource_loader_options.h"
57 #include "third_party/blink/renderer/platform/loader/fetch/resource_request.h"
58 #include "third_party/blink/renderer/platform/loader/fetch/resource_response.h"
59 #include "third_party/blink/renderer/platform/network/http_names.h"
60 #include "third_party/blink/renderer/platform/weborigin/security_origin.h"
61 #include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
62
63 namespace blink {
64
65 const uint64_t EventSource::kDefaultReconnectDelay = 3000;
66
EventSource(ExecutionContext * context,const KURL & url,const EventSourceInit * event_source_init)67 inline EventSource::EventSource(ExecutionContext* context,
68 const KURL& url,
69 const EventSourceInit* event_source_init)
70 : ExecutionContextLifecycleObserver(context),
71 url_(url),
72 current_url_(url),
73 with_credentials_(event_source_init->withCredentials()),
74 state_(kConnecting),
75 connect_timer_(context->GetTaskRunner(TaskType::kRemoteEvent),
76 this,
77 &EventSource::ConnectTimerFired),
78 reconnect_delay_(kDefaultReconnectDelay) {}
79
Create(ExecutionContext * context,const String & url,const EventSourceInit * event_source_init,ExceptionState & exception_state)80 EventSource* EventSource::Create(ExecutionContext* context,
81 const String& url,
82 const EventSourceInit* event_source_init,
83 ExceptionState& exception_state) {
84 UseCounter::Count(context, context->IsDocument()
85 ? WebFeature::kEventSourceDocument
86 : WebFeature::kEventSourceWorker);
87
88 if (url.IsEmpty()) {
89 exception_state.ThrowDOMException(
90 DOMExceptionCode::kSyntaxError,
91 "Cannot open an EventSource to an empty URL.");
92 return nullptr;
93 }
94
95 KURL full_url = context->CompleteURL(url);
96 if (!full_url.IsValid()) {
97 exception_state.ThrowDOMException(
98 DOMExceptionCode::kSyntaxError,
99 "Cannot open an EventSource to '" + url + "'. The URL is invalid.");
100 return nullptr;
101 }
102
103 EventSource* source =
104 MakeGarbageCollected<EventSource>(context, full_url, event_source_init);
105
106 source->ScheduleInitialConnect();
107 return source;
108 }
109
~EventSource()110 EventSource::~EventSource() {
111 DCHECK_EQ(kClosed, state_);
112 DCHECK(!loader_);
113 }
114
ScheduleInitialConnect()115 void EventSource::ScheduleInitialConnect() {
116 DCHECK_EQ(kConnecting, state_);
117 DCHECK(!loader_);
118
119 connect_timer_.StartOneShot(base::TimeDelta(), FROM_HERE);
120 }
121
Connect()122 void EventSource::Connect() {
123 DCHECK_EQ(kConnecting, state_);
124 DCHECK(!loader_);
125 DCHECK(GetExecutionContext());
126
127 ExecutionContext& execution_context = *this->GetExecutionContext();
128 ResourceRequest request(current_url_);
129 request.SetHttpMethod(http_names::kGET);
130 request.SetHttpHeaderField(http_names::kAccept, "text/event-stream");
131 request.SetHttpHeaderField(http_names::kCacheControl, "no-cache");
132 request.SetRequestContext(mojom::RequestContextType::EVENT_SOURCE);
133 request.SetMode(network::mojom::RequestMode::kCors);
134 request.SetCredentialsMode(
135 with_credentials_ ? network::mojom::CredentialsMode::kInclude
136 : network::mojom::CredentialsMode::kSameOrigin);
137 request.SetCacheMode(blink::mojom::FetchCacheMode::kNoStore);
138 request.SetExternalRequestStateFromRequestorAddressSpace(
139 execution_context.GetSecurityContext().AddressSpace());
140 request.SetCorsPreflightPolicy(
141 network::mojom::CorsPreflightPolicy::kPreventPreflight);
142 if (parser_ && !parser_->LastEventId().IsEmpty()) {
143 // HTTP headers are Latin-1 byte strings, but the Last-Event-ID header is
144 // encoded as UTF-8.
145 // TODO(davidben): This should be captured in the type of
146 // setHTTPHeaderField's arguments.
147 std::string last_event_id_utf8 = parser_->LastEventId().Utf8();
148 request.SetHttpHeaderField(
149 http_names::kLastEventID,
150 AtomicString(reinterpret_cast<const LChar*>(last_event_id_utf8.c_str()),
151 last_event_id_utf8.length()));
152 }
153
154 ResourceLoaderOptions resource_loader_options;
155 resource_loader_options.data_buffering_policy = kDoNotBufferData;
156
157 probe::WillSendEventSourceRequest(&execution_context);
158 loader_ = MakeGarbageCollected<ThreadableLoader>(execution_context, this,
159 resource_loader_options);
160 loader_->Start(request);
161 }
162
NetworkRequestEnded()163 void EventSource::NetworkRequestEnded() {
164 loader_ = nullptr;
165
166 if (state_ != kClosed)
167 ScheduleReconnect();
168 }
169
ScheduleReconnect()170 void EventSource::ScheduleReconnect() {
171 state_ = kConnecting;
172 connect_timer_.StartOneShot(
173 base::TimeDelta::FromMilliseconds(reconnect_delay_), FROM_HERE);
174 DispatchEvent(*Event::Create(event_type_names::kError));
175 }
176
ConnectTimerFired(TimerBase *)177 void EventSource::ConnectTimerFired(TimerBase*) {
178 Connect();
179 }
180
url() const181 String EventSource::url() const {
182 return url_.GetString();
183 }
184
withCredentials() const185 bool EventSource::withCredentials() const {
186 return with_credentials_;
187 }
188
readyState() const189 EventSource::State EventSource::readyState() const {
190 return state_;
191 }
192
close()193 void EventSource::close() {
194 if (state_ == kClosed) {
195 DCHECK(!loader_);
196 return;
197 }
198 if (parser_)
199 parser_->Stop();
200
201 // Stop trying to reconnect if EventSource was explicitly closed or if
202 // contextDestroyed() was called.
203 if (connect_timer_.IsActive()) {
204 connect_timer_.Stop();
205 }
206
207 state_ = kClosed;
208
209 if (loader_) {
210 loader_->Cancel();
211 loader_ = nullptr;
212 }
213
214 }
215
InterfaceName() const216 const AtomicString& EventSource::InterfaceName() const {
217 return event_target_names::kEventSource;
218 }
219
GetExecutionContext() const220 ExecutionContext* EventSource::GetExecutionContext() const {
221 return ExecutionContextLifecycleObserver::GetExecutionContext();
222 }
223
DidReceiveResponse(uint64_t identifier,const ResourceResponse & response)224 void EventSource::DidReceiveResponse(uint64_t identifier,
225 const ResourceResponse& response) {
226 DCHECK_EQ(kConnecting, state_);
227 DCHECK(loader_);
228
229 resource_identifier_ = identifier;
230 current_url_ = response.CurrentRequestUrl();
231 event_stream_origin_ =
232 SecurityOrigin::Create(response.CurrentRequestUrl())->ToString();
233 int status_code = response.HttpStatusCode();
234 bool mime_type_is_valid = response.MimeType() == "text/event-stream";
235 bool response_is_valid = status_code == 200 && mime_type_is_valid;
236 if (response_is_valid) {
237 const String& charset = response.TextEncodingName();
238 // If we have a charset, the only allowed value is UTF-8 (case-insensitive).
239 response_is_valid =
240 charset.IsEmpty() || EqualIgnoringASCIICase(charset, "UTF-8");
241 if (!response_is_valid) {
242 StringBuilder message;
243 message.Append("EventSource's response has a charset (\"");
244 message.Append(charset);
245 message.Append("\") that is not UTF-8. Aborting the connection.");
246 // FIXME: We are missing the source line.
247 GetExecutionContext()->AddConsoleMessage(
248 MakeGarbageCollected<ConsoleMessage>(
249 mojom::ConsoleMessageSource::kJavaScript,
250 mojom::ConsoleMessageLevel::kError, message.ToString()));
251 }
252 } else {
253 // To keep the signal-to-noise ratio low, we only log 200-response with an
254 // invalid MIME type.
255 if (status_code == 200 && !mime_type_is_valid) {
256 StringBuilder message;
257 message.Append("EventSource's response has a MIME type (\"");
258 message.Append(response.MimeType());
259 message.Append(
260 "\") that is not \"text/event-stream\". Aborting the connection.");
261 // FIXME: We are missing the source line.
262 GetExecutionContext()->AddConsoleMessage(
263 MakeGarbageCollected<ConsoleMessage>(
264 mojom::ConsoleMessageSource::kJavaScript,
265 mojom::ConsoleMessageLevel::kError, message.ToString()));
266 }
267 }
268
269 if (response_is_valid) {
270 state_ = kOpen;
271 AtomicString last_event_id;
272 if (parser_) {
273 // The new parser takes over the event ID.
274 last_event_id = parser_->LastEventId();
275 }
276 parser_ = MakeGarbageCollected<EventSourceParser>(last_event_id, this);
277 DispatchEvent(*Event::Create(event_type_names::kOpen));
278 } else {
279 loader_->Cancel();
280 }
281 }
282
DidReceiveData(const char * data,unsigned length)283 void EventSource::DidReceiveData(const char* data, unsigned length) {
284 DCHECK_EQ(kOpen, state_);
285 DCHECK(loader_);
286 DCHECK(parser_);
287
288 parser_->AddBytes(data, length);
289 }
290
DidFinishLoading(uint64_t)291 void EventSource::DidFinishLoading(uint64_t) {
292 DCHECK_EQ(kOpen, state_);
293 DCHECK(loader_);
294
295 NetworkRequestEnded();
296 }
297
DidFail(const ResourceError & error)298 void EventSource::DidFail(const ResourceError& error) {
299 DCHECK(loader_);
300 if (error.IsCancellation() && state_ == kClosed) {
301 NetworkRequestEnded();
302 return;
303 }
304
305 DCHECK_NE(kClosed, state_);
306
307 if (error.IsAccessCheck()) {
308 AbortConnectionAttempt();
309 return;
310 }
311
312 if (error.IsCancellation()) {
313 // When the loading is cancelled for an external reason (e.g.,
314 // window.stop()), dispatch an error event and do not reconnect.
315 AbortConnectionAttempt();
316 return;
317 }
318 NetworkRequestEnded();
319 }
320
DidFailRedirectCheck()321 void EventSource::DidFailRedirectCheck() {
322 DCHECK(loader_);
323
324 AbortConnectionAttempt();
325 }
326
OnMessageEvent(const AtomicString & event_type,const String & data,const AtomicString & last_event_id)327 void EventSource::OnMessageEvent(const AtomicString& event_type,
328 const String& data,
329 const AtomicString& last_event_id) {
330 MessageEvent* e = MessageEvent::Create();
331 e->initMessageEvent(event_type, false, false, data, event_stream_origin_,
332 last_event_id, nullptr, nullptr);
333
334 probe::WillDispatchEventSourceEvent(GetExecutionContext(),
335 resource_identifier_, event_type,
336 last_event_id, data);
337 DispatchEvent(*e);
338 }
339
OnReconnectionTimeSet(uint64_t reconnection_time)340 void EventSource::OnReconnectionTimeSet(uint64_t reconnection_time) {
341 reconnect_delay_ = reconnection_time;
342 }
343
AbortConnectionAttempt()344 void EventSource::AbortConnectionAttempt() {
345 DCHECK_NE(kClosed, state_);
346
347 loader_ = nullptr;
348 state_ = kClosed;
349 NetworkRequestEnded();
350
351 DispatchEvent(*Event::Create(event_type_names::kError));
352 }
353
ContextDestroyed()354 void EventSource::ContextDestroyed() {
355 close();
356 }
357
HasPendingActivity() const358 bool EventSource::HasPendingActivity() const {
359 return state_ != kClosed;
360 }
361
Trace(Visitor * visitor)362 void EventSource::Trace(Visitor* visitor) {
363 visitor->Trace(parser_);
364 visitor->Trace(loader_);
365 EventTargetWithInlineData::Trace(visitor);
366 ThreadableLoaderClient::Trace(visitor);
367 ExecutionContextLifecycleObserver::Trace(visitor);
368 EventSourceParser::Client::Trace(visitor);
369 }
370
371 } // namespace blink
372