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.
5 #ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
6 #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
11 #include "base/callback.h"
12 #include "base/compiler_specific.h"
13 #include "base/memory/ref_counted.h"
14 #include "base/memory/scoped_ptr.h"
15 #include "base/memory/weak_ptr.h"
16 #include "base/process/process.h"
17 #include "base/sequenced_task_runner_helpers.h"
18 #include "content/public/browser/browser_thread.h"
19 #include "content/public/common/console_message_level.h"
20 #include "extensions/browser/extension_function_histogram_value.h"
21 #include "extensions/browser/info_map.h"
22 #include "extensions/common/extension.h"
23 #include "extensions/common/features/feature.h"
24 #include "ipc/ipc_message.h"
26 class ExtensionFunction;
27 class UIThreadExtensionFunction;
28 class IOThreadExtensionFunction;
37 class RenderFrameHost;
42 namespace extensions {
43 class ExtensionFunctionDispatcher;
44 class ExtensionMessageFilter;
45 class QuotaLimitHeuristic;
53 #define EXTENSION_FUNCTION_VALIDATE(test) \
56 this->bad_message_ = true; \
57 return ValidationFailure(this); \
61 #define EXTENSION_FUNCTION_VALIDATE(test) CHECK(test)
64 #define EXTENSION_FUNCTION_ERROR(error) \
67 this->bad_message_ = true; \
68 return ValidationFailure(this); \
71 // Declares a callable extension function with the given |name|. You must also
72 // supply a unique |histogramvalue| used for histograms of extension function
73 // invocation (add new ones at the end of the enum in
74 // extension_function_histogram_value.h).
75 #define DECLARE_EXTENSION_FUNCTION(name, histogramvalue) \
76 public: static const char* function_name() { return name; } \
77 public: static extensions::functions::HistogramValue histogram_value() \
78 { return extensions::functions::histogramvalue; }
80 // Traits that describe how ExtensionFunction should be deleted. This just calls
81 // the virtual "Destruct" method on ExtensionFunction, allowing derived classes
82 // to override the behavior.
83 struct ExtensionFunctionDeleteTraits {
85 static void Destruct(const ExtensionFunction* x);
88 // Abstract base class for extension functions the ExtensionFunctionDispatcher
89 // knows how to dispatch to.
90 class ExtensionFunction
91 : public base::RefCountedThreadSafe<ExtensionFunction,
92 ExtensionFunctionDeleteTraits> {
95 // The function has succeeded.
97 // The function has failed.
99 // The input message is malformed.
103 typedef base::Callback<void(ResponseType type,
104 const base::ListValue& results,
105 const std::string& error)> ResponseCallback;
109 virtual UIThreadExtensionFunction* AsUIThreadExtensionFunction();
110 virtual IOThreadExtensionFunction* AsIOThreadExtensionFunction();
112 // Returns true if the function has permission to run.
114 // The default implementation is to check the Extension's permissions against
115 // what this function requires to run, but some APIs may require finer
116 // grained control, such as tabs.executeScript being allowed for active tabs.
118 // This will be run after the function has been set up but before Run().
119 virtual bool HasPermission();
121 // The result of a function call.
123 // Use NoArguments(), OneArgument(), ArgumentList(), or Error()
124 // rather than this class directly.
125 class ResponseValueObject {
127 virtual ~ResponseValueObject() {}
129 // Returns true for success, false for failure.
130 virtual bool Apply() = 0;
132 typedef scoped_ptr<ResponseValueObject> ResponseValue;
134 // The action to use when returning from RunAsync.
136 // Use RespondNow() or RespondLater() rather than this class directly.
137 class ResponseActionObject {
139 virtual ~ResponseActionObject() {}
141 virtual void Execute() = 0;
143 typedef scoped_ptr<ResponseActionObject> ResponseAction;
145 // Runs the function and returns the action to take when the caller is ready
148 // Typical return values might be:
149 // * RespondNow(NoArguments())
150 // * RespondNow(OneArgument(42))
151 // * RespondNow(ArgumentList(my_result.ToValue()))
152 // * RespondNow(Error("Warp core breach"))
153 // * RespondNow(Error("Warp core breach on *", GetURL()))
154 // * RespondLater(), then later,
155 // * Respond(NoArguments())
159 // Callers must call Execute() on the return ResponseAction at some point,
162 // SyncExtensionFunction and AsyncExtensionFunction implement this in terms
163 // of SyncExtensionFunction::RunSync and AsyncExtensionFunction::RunAsync,
164 // but this is deprecated. ExtensionFunction implementations are encouraged
165 // to just implement Run.
166 virtual ResponseAction Run() WARN_UNUSED_RESULT = 0;
168 // Gets whether quota should be applied to this individual function
169 // invocation. This is different to GetQuotaLimitHeuristics which is only
170 // invoked once and then cached.
172 // Returns false by default.
173 virtual bool ShouldSkipQuotaLimiting() const;
175 // Optionally adds one or multiple QuotaLimitHeuristic instances suitable for
176 // this function to |heuristics|. The ownership of the new QuotaLimitHeuristic
177 // instances is passed to the owner of |heuristics|.
178 // No quota limiting by default.
180 // Only called once per lifetime of the QuotaService.
181 virtual void GetQuotaLimitHeuristics(
182 extensions::QuotaLimitHeuristics* heuristics) const {}
184 // Called when the quota limit has been exceeded. The default implementation
186 virtual void OnQuotaExceeded(const std::string& violation_error);
188 // Specifies the raw arguments to the function, as a JSON value.
189 virtual void SetArgs(const base::ListValue* args);
191 // Sets a single Value as the results of the function.
192 void SetResult(base::Value* result);
194 // Sets multiple Values as the results of the function.
195 void SetResultList(scoped_ptr<base::ListValue> results);
197 // Retrieves the results of the function as a ListValue.
198 const base::ListValue* GetResultList() const;
200 // Retrieves any error string from the function.
201 virtual std::string GetError() const;
203 // Sets the function's error string.
204 virtual void SetError(const std::string& error);
206 // Sets the function's bad message state.
207 void set_bad_message(bool bad_message) { bad_message_ = bad_message; }
209 // Specifies the name of the function.
210 void set_name(const std::string& name) { name_ = name; }
211 const std::string& name() const { return name_; }
213 void set_profile_id(void* profile_id) { profile_id_ = profile_id; }
214 void* profile_id() const { return profile_id_; }
217 const scoped_refptr<const extensions::Extension>& extension) {
218 extension_ = extension;
220 const extensions::Extension* extension() const { return extension_.get(); }
221 const std::string& extension_id() const {
223 << "extension_id() called without an Extension. If " << name()
224 << " is allowed to be called without any Extension then you should "
225 << "check extension() first. If not, there is a bug in the Extension "
226 << "platform, so page somebody in extensions/OWNERS";
227 return extension_->id();
230 void set_request_id(int request_id) { request_id_ = request_id; }
231 int request_id() { return request_id_; }
233 void set_source_url(const GURL& source_url) { source_url_ = source_url; }
234 const GURL& source_url() { return source_url_; }
236 void set_has_callback(bool has_callback) { has_callback_ = has_callback; }
237 bool has_callback() { return has_callback_; }
239 void set_include_incognito(bool include) { include_incognito_ = include; }
240 bool include_incognito() const { return include_incognito_; }
242 void set_user_gesture(bool user_gesture) { user_gesture_ = user_gesture; }
243 bool user_gesture() const { return user_gesture_; }
245 void set_histogram_value(
246 extensions::functions::HistogramValue histogram_value) {
247 histogram_value_ = histogram_value; }
248 extensions::functions::HistogramValue histogram_value() const {
249 return histogram_value_; }
251 void set_response_callback(const ResponseCallback& callback) {
252 response_callback_ = callback;
255 void set_source_tab_id(int source_tab_id) { source_tab_id_ = source_tab_id; }
256 int source_tab_id() const { return source_tab_id_; }
258 void set_source_context_type(extensions::Feature::Context type) {
259 source_context_type_ = type;
261 extensions::Feature::Context source_context_type() const {
262 return source_context_type_;
266 friend struct ExtensionFunctionDeleteTraits;
270 // Success, no arguments to pass to caller.
271 ResponseValue NoArguments();
272 // Success, a single argument |arg| to pass to caller. TAKES OWNERSHIP - a
273 // raw pointer for convenience, since callers usually construct the argument
275 ResponseValue OneArgument(base::Value* arg);
276 // Success, two arguments |arg1| and |arg2| to pass to caller. TAKES
277 // OWNERSHIP - raw pointers for convenience, since callers usually construct
278 // the argument to this by hand. Note that use of this function may imply you
279 // should be using the generated Result struct and ArgumentList.
280 ResponseValue TwoArguments(base::Value* arg1, base::Value* arg2);
281 // Success, a list of arguments |results| to pass to caller. TAKES OWNERSHIP
282 // - a scoped_ptr<> for convenience, since callers usually get this from the
283 // result of a Create(...) call on the generated Results struct, for example,
284 // alarms::Get::Results::Create(alarm).
285 ResponseValue ArgumentList(scoped_ptr<base::ListValue> results);
286 // Error. chrome.runtime.lastError.message will be set to |error|.
287 ResponseValue Error(const std::string& error);
288 // Error with formatting. Args are processed using
289 // ErrorUtils::FormatErrorMessage, that is, each occurence of * is replaced
290 // by the corresponding |s*|:
291 // Error("Error in *: *", "foo", "bar") <--> Error("Error in foo: bar").
292 ResponseValue Error(const std::string& format, const std::string& s1);
293 ResponseValue Error(const std::string& format,
294 const std::string& s1,
295 const std::string& s2);
296 ResponseValue Error(const std::string& format,
297 const std::string& s1,
298 const std::string& s2,
299 const std::string& s3);
300 // Bad message. A ResponseValue equivalent to EXTENSION_FUNCTION_VALIDATE(),
301 // so this will actually kill the renderer and not respond at all.
302 ResponseValue BadMessage();
306 // Respond to the extension immediately with |result|.
307 ResponseAction RespondNow(ResponseValue result);
308 // Don't respond now, but promise to call Respond(...) later.
309 ResponseAction RespondLater();
311 // This is the return value of the EXTENSION_FUNCTION_VALIDATE macro, which
312 // needs to work from Run(), RunAsync(), and RunSync(). The former of those
313 // has a different return type (ResponseAction) than the latter two (bool).
314 static ResponseAction ValidationFailure(ExtensionFunction* function);
316 // If RespondLater() was used, functions must at some point call Respond()
317 // with |result| as their result.
318 void Respond(ResponseValue result);
320 virtual ~ExtensionFunction();
322 // Helper method for ExtensionFunctionDeleteTraits. Deletes this object.
323 virtual void Destruct() const = 0;
325 // Do not call this function directly, return the appropriate ResponseAction
326 // from Run() instead. If using RespondLater then call Respond().
328 // Call with true to indicate success, false to indicate failure, in which
329 // case please set |error_|.
330 virtual void SendResponse(bool success) = 0;
332 // Common implementation for SendResponse.
333 void SendResponseImpl(bool success);
335 // Return true if the argument to this function at |index| was provided and
337 bool HasOptionalArgument(size_t index);
339 // Id of this request, used to map the response back to the caller.
342 // The id of the profile of this function's extension.
345 // The extension that called this function.
346 scoped_refptr<const extensions::Extension> extension_;
348 // The name of this function.
351 // The URL of the frame which is making this request
354 // True if the js caller provides a callback function to receive the response
358 // True if this callback should include information from incognito contexts
359 // even if our profile_ is non-incognito. Note that in the case of a "split"
360 // mode extension, this will always be false, and we will limit access to
361 // data from within the same profile_ (either incognito or not).
362 bool include_incognito_;
364 // True if the call was made in response of user gesture.
367 // The arguments to the API. Only non-null if argument were specified.
368 scoped_ptr<base::ListValue> args_;
370 // The results of the API. This should be populated by the derived class
371 // before SendResponse() is called.
372 scoped_ptr<base::ListValue> results_;
374 // Any detailed error from the API. This should be populated by the derived
375 // class before Run() returns.
378 // Any class that gets a malformed message should set this to true before
379 // returning. Usually we want to kill the message sending process.
382 // The sample value to record with the histogram API when the function
384 extensions::functions::HistogramValue histogram_value_;
386 // The callback to run once the function has done execution.
387 ResponseCallback response_callback_;
389 // The ID of the tab triggered this function call, or -1 if there is no tab.
392 // The type of the JavaScript context where this call originated.
393 extensions::Feature::Context source_context_type_;
396 void OnRespondingLater(ResponseValue response);
398 DISALLOW_COPY_AND_ASSIGN(ExtensionFunction);
401 // Extension functions that run on the UI thread. Most functions fall into
403 class UIThreadExtensionFunction : public ExtensionFunction {
405 // TODO(yzshen): We should be able to remove this interface now that we
406 // support overriding the response callback.
407 // A delegate for use in testing, to intercept the call to SendResponse.
408 class DelegateForTests {
410 virtual void OnSendResponse(UIThreadExtensionFunction* function,
412 bool bad_message) = 0;
415 UIThreadExtensionFunction();
417 UIThreadExtensionFunction* AsUIThreadExtensionFunction() override;
419 void set_test_delegate(DelegateForTests* delegate) {
420 delegate_ = delegate;
423 // Called when a message was received.
424 // Should return true if it processed the message.
425 virtual bool OnMessageReceived(const IPC::Message& message);
427 // Set the browser context which contains the extension that has originated
428 // this function call.
429 void set_browser_context(content::BrowserContext* context) {
432 content::BrowserContext* browser_context() const { return context_; }
434 void SetRenderViewHost(content::RenderViewHost* render_view_host);
435 content::RenderViewHost* render_view_host() const {
436 return render_view_host_;
438 void SetRenderFrameHost(content::RenderFrameHost* render_frame_host);
439 content::RenderFrameHost* render_frame_host() const {
440 return render_frame_host_;
443 void set_dispatcher(const base::WeakPtr<
444 extensions::ExtensionFunctionDispatcher>& dispatcher) {
445 dispatcher_ = dispatcher;
447 extensions::ExtensionFunctionDispatcher* dispatcher() const {
448 return dispatcher_.get();
451 // Gets the "current" web contents if any. If there is no associated web
452 // contents then defaults to the foremost one.
453 virtual content::WebContents* GetAssociatedWebContents();
456 // Emits a message to the extension's devtools console.
457 void WriteToConsole(content::ConsoleMessageLevel level,
458 const std::string& message);
460 friend struct content::BrowserThread::DeleteOnThread<
461 content::BrowserThread::UI>;
462 friend class base::DeleteHelper<UIThreadExtensionFunction>;
464 ~UIThreadExtensionFunction() override;
466 void SendResponse(bool success) override;
468 // Sets the Blob UUIDs whose ownership is being transferred to the renderer.
469 void SetTransferredBlobUUIDs(const std::vector<std::string>& blob_uuids);
471 // The dispatcher that will service this extension function call.
472 base::WeakPtr<extensions::ExtensionFunctionDispatcher> dispatcher_;
474 // The RenderViewHost we will send responses to.
475 content::RenderViewHost* render_view_host_;
477 // The RenderFrameHost we will send responses to.
478 // NOTE: either render_view_host_ or render_frame_host_ will be set, as we
479 // port code to use RenderFrames for OOPIF. See http://crbug.com/304341.
480 content::RenderFrameHost* render_frame_host_;
482 // The content::BrowserContext of this function's extension.
483 content::BrowserContext* context_;
486 class RenderHostTracker;
488 void Destruct() const override;
490 // TODO(tommycli): Remove once RenderViewHost is gone.
491 IPC::Sender* GetIPCSender();
494 scoped_ptr<RenderHostTracker> tracker_;
496 DelegateForTests* delegate_;
498 // The blobs transferred to the renderer process.
499 std::vector<std::string> transferred_blob_uuids_;
502 // Extension functions that run on the IO thread. This type of function avoids
503 // a roundtrip to and from the UI thread (because communication with the
504 // extension process happens on the IO thread). It's intended to be used when
505 // performance is critical (e.g. the webRequest API which can block network
506 // requests). Generally, UIThreadExtensionFunction is more appropriate and will
507 // be easier to use and interface with the rest of the browser.
508 class IOThreadExtensionFunction : public ExtensionFunction {
510 IOThreadExtensionFunction();
512 IOThreadExtensionFunction* AsIOThreadExtensionFunction() override;
515 base::WeakPtr<extensions::ExtensionMessageFilter> ipc_sender,
517 ipc_sender_ = ipc_sender;
518 routing_id_ = routing_id;
521 base::WeakPtr<extensions::ExtensionMessageFilter> ipc_sender_weak() const {
525 int routing_id() const { return routing_id_; }
527 void set_extension_info_map(const extensions::InfoMap* extension_info_map) {
528 extension_info_map_ = extension_info_map;
530 const extensions::InfoMap* extension_info_map() const {
531 return extension_info_map_.get();
535 friend struct content::BrowserThread::DeleteOnThread<
536 content::BrowserThread::IO>;
537 friend class base::DeleteHelper<IOThreadExtensionFunction>;
539 ~IOThreadExtensionFunction() override;
541 void Destruct() const override;
543 void SendResponse(bool success) override;
546 base::WeakPtr<extensions::ExtensionMessageFilter> ipc_sender_;
549 scoped_refptr<const extensions::InfoMap> extension_info_map_;
552 // Base class for an extension function that runs asynchronously *relative to
553 // the browser's UI thread*.
554 class AsyncExtensionFunction : public UIThreadExtensionFunction {
556 AsyncExtensionFunction();
559 ~AsyncExtensionFunction() override;
561 // Deprecated: Override UIThreadExtensionFunction and implement Run() instead.
563 // AsyncExtensionFunctions implement this method. Return true to indicate that
564 // nothing has gone wrong yet; SendResponse must be called later. Return false
565 // to respond immediately with an error.
566 virtual bool RunAsync() = 0;
568 // ValidationFailure override to match RunAsync().
569 static bool ValidationFailure(AsyncExtensionFunction* function);
572 ResponseAction Run() override;
575 // A SyncExtensionFunction is an ExtensionFunction that runs synchronously
576 // *relative to the browser's UI thread*. Note that this has nothing to do with
577 // running synchronously relative to the extension process. From the extension
578 // process's point of view, the function is still asynchronous.
580 // This kind of function is convenient for implementing simple APIs that just
581 // need to interact with things on the browser UI thread.
582 class SyncExtensionFunction : public UIThreadExtensionFunction {
584 SyncExtensionFunction();
587 ~SyncExtensionFunction() override;
589 // Deprecated: Override UIThreadExtensionFunction and implement Run() instead.
591 // SyncExtensionFunctions implement this method. Return true to respond
592 // immediately with success, false to respond immediately with an error.
593 virtual bool RunSync() = 0;
595 // ValidationFailure override to match RunSync().
596 static bool ValidationFailure(SyncExtensionFunction* function);
599 ResponseAction Run() override;
602 class SyncIOThreadExtensionFunction : public IOThreadExtensionFunction {
604 SyncIOThreadExtensionFunction();
607 ~SyncIOThreadExtensionFunction() override;
609 // Deprecated: Override IOThreadExtensionFunction and implement Run() instead.
611 // SyncIOThreadExtensionFunctions implement this method. Return true to
612 // respond immediately with success, false to respond immediately with an
614 virtual bool RunSync() = 0;
616 // ValidationFailure override to match RunSync().
617 static bool ValidationFailure(SyncIOThreadExtensionFunction* function);
620 ResponseAction Run() override;
623 #endif // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_