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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
#define EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
#include <stdint.h>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "extensions/common/user_script.h"
#include "extensions/renderer/injection_host.h"
#include "extensions/renderer/script_injector.h"
struct HostID;
namespace blink {
template<typename T> class WebVector;
}
namespace content {
class RenderFrame;
}
namespace v8 {
class Value;
template <class T> class Local;
}
namespace extensions {
struct ScriptsRunInfo;
// A script wrapper which is aware of whether or not it is allowed to execute,
// and contains the implementation to do so.
class ScriptInjection {
public:
enum InjectionResult {
INJECTION_FINISHED,
INJECTION_BLOCKED,
INJECTION_WAITING
};
using CompletionCallback = base::Callback<void(ScriptInjection*)>;
// Return the id of the injection host associated with the given world.
static std::string GetHostIdForIsolatedWorld(int world_id);
// Remove the isolated world associated with the given injection host.
static void RemoveIsolatedWorld(const std::string& host_id);
ScriptInjection(scoped_ptr<ScriptInjector> injector,
content::RenderFrame* render_frame,
scoped_ptr<const InjectionHost> injection_host,
UserScript::RunLocation run_location);
~ScriptInjection();
// Try to inject the script at the |current_location|. This returns
// INJECTION_FINISHED if injection has injected or will never inject, returns
// INJECTION_BLOCKED if injection is running asynchronously and has not
// finished yet, returns INJECTION_WAITING if injections is delayed (either
// for permission purposes or because |current_location| is not the designated
// |run_location_|).
// If INJECTION_BLOCKED is returned, |async_completion_callback| will be
// called upon completion.
InjectionResult TryToInject(
UserScript::RunLocation current_location,
ScriptsRunInfo* scripts_run_info,
const CompletionCallback& async_completion_callback);
// Called when permission for the given injection has been granted.
// Returns INJECTION_FINISHED if injection has injected or will never inject,
// returns INJECTION_BLOCKED if injection is ran asynchronously.
InjectionResult OnPermissionGranted(ScriptsRunInfo* scripts_run_info);
// Resets the pointer of the injection host when the host is gone.
void OnHostRemoved();
void invalidate_render_frame() { render_frame_ = nullptr; }
// Accessors.
content::RenderFrame* render_frame() const { return render_frame_; }
const HostID& host_id() const { return injection_host_->id(); }
int64_t request_id() const { return request_id_; }
private:
class FrameWatcher;
// Sends a message to the browser to request permission to inject.
void RequestPermissionFromBrowser();
// Injects the script. Returns INJECTION_FINISHED if injection has finished,
// otherwise INJECTION_BLOCKED.
InjectionResult Inject(ScriptsRunInfo* scripts_run_info);
// Inject any JS scripts into the frame for the injection.
void InjectJs();
// Called when JS injection for the given frame has been completed.
void OnJsInjectionCompleted(
const blink::WebVector<v8::Local<v8::Value> >& results);
// Inject any CSS source into the frame for the injection.
void InjectCss();
// Notify that we will not inject, and mark it as acknowledged.
void NotifyWillNotInject(ScriptInjector::InjectFailureReason reason);
// The injector for this injection.
scoped_ptr<ScriptInjector> injector_;
// The RenderFrame into which this should inject the script.
content::RenderFrame* render_frame_;
// The associated injection host.
scoped_ptr<const InjectionHost> injection_host_;
// The location in the document load at which we inject the script.
UserScript::RunLocation run_location_;
// This injection's request id. This will be -1 unless the injection is
// currently waiting on permission.
int64_t request_id_;
// Whether or not the injection is complete, either via injecting the script
// or because it will never complete.
bool complete_;
// Whether or not the injection successfully injected JS.
bool did_inject_js_;
// Results storage.
scoped_ptr<base::Value> execution_result_;
// The callback to run upon completing asynchronously.
CompletionCallback async_completion_callback_;
// A helper class to hold the render frame and watch for its deletion.
scoped_ptr<FrameWatcher> frame_watcher_;
base::WeakPtrFactory<ScriptInjection> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ScriptInjection);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
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