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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/policy/content/proceed_until_response_navigation_throttle.h"
#include "base/notimplemented.h"
#include "base/strings/strcat.h"
ProceedUntilResponseNavigationThrottle::Client::Client(
content::NavigationThrottleRegistry& registry)
: NavigationThrottle(registry) {}
ProceedUntilResponseNavigationThrottle::ProceedUntilResponseNavigationThrottle(
content::NavigationThrottleRegistry& registry,
std::unique_ptr<Client> client,
std::optional<DeferredResultCallback> deferred_result_callback)
: NavigationThrottle(registry),
name_(base::StrCat({"ProceedUntilResponseNavigationThrottle::",
client ? client->GetNameForLogging() : ""})),
client_(std::move(client)),
deferred_result_callback_(std::move(deferred_result_callback)) {
CHECK(client_);
client_->SetDeferredResultCallback(base::BindRepeating(
&ProceedUntilResponseNavigationThrottle::ResolveDeferredResult,
base::Unretained(this)));
}
ProceedUntilResponseNavigationThrottle::
~ProceedUntilResponseNavigationThrottle() = default;
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::WillStartRequest() {
CHECK_EQ(deferred_state_, DeferredState::kNotDeferred);
CHECK(!result_.has_value());
return ProcessEvent(Event::kWillStartRequest);
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::WillRedirectRequest() {
return ProcessEvent(Event::kWillRedirectRequest);
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::WillFailRequest() {
NOTIMPLEMENTED() << "not verified in any test";
return ProcessEvent(Event::kWillFailRequest);
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::WillProcessResponse() {
return ProcessEvent(Event::kWillProcessResponse);
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::WillCommitWithoutUrlLoader() {
NOTIMPLEMENTED() << "not verified in any test";
return ProcessEvent(Event::kWillCommitWithoutUrlLoader);
}
const char* ProceedUntilResponseNavigationThrottle::GetNameForLogging() {
return name_.c_str();
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::ProcessEvent(Event event) {
switch (deferred_state_) {
case DeferredState::kNotDeferred: {
// The internal throttle isn't currently running an asynchronous task.
// If the previous asynchronous task returned non-PROCEED action, return
// it.
if (result_.has_value() && result_->action() != PROCEED) {
return std::move(result_).value();
}
// Otherwise, forward the event to the internal throttle.
content::NavigationThrottle::ThrottleCheckResult result =
CallInternalThrottle(event);
if (result.action() == DEFER) {
if (!CanProceedSpeculatively(event)) {
// Need to be kDeferredExposed state, but ResolveDeferredResult()
// need a dedicated implementation for this case.
NOTIMPLEMENTED();
}
// Hides the DEFER action and proceeds.
deferred_state_ = DeferredState::kDeferredNotExposed;
pending_event_ = Event::kNoEvent;
return PROCEED;
}
return result;
}
case DeferredState::kDeferredNotExposed:
// The internal throttle is still running an asynchronous task. Change the
// deferred_state_ to kDeferredExposed to revisit the event when the
// asynchronous task completes.
deferred_state_ = DeferredState::kDeferredExposed;
pending_event_ = event;
// Returns DEFER to avoid more events happening.
return DEFER;
case DeferredState::kDeferredExposed:
// While we expose DEFER, any event should not be delivered.
NOTREACHED();
}
}
bool ProceedUntilResponseNavigationThrottle::CanProceedSpeculatively(
Event event) {
switch (event) {
case Event::kNoEvent:
NOTREACHED();
case Event::kWillStartRequest:
case Event::kWillRedirectRequest:
return true;
case Event::kWillFailRequest:
case Event::kWillProcessResponse:
case Event::kWillCommitWithoutUrlLoader:
return false;
}
NOTREACHED();
}
content::NavigationThrottle::ThrottleCheckResult
ProceedUntilResponseNavigationThrottle::CallInternalThrottle(Event event) {
switch (event) {
case Event::kNoEvent:
NOTREACHED();
case Event::kWillStartRequest:
return client_->WillStartRequest();
case Event::kWillRedirectRequest:
return client_->WillRedirectRequest();
case Event::kWillFailRequest:
return client_->WillFailRequest();
case Event::kWillProcessResponse:
return client_->WillProcessResponse();
case Event::kWillCommitWithoutUrlLoader:
return client_->WillCommitWithoutUrlLoader();
}
NOTREACHED();
}
void ProceedUntilResponseNavigationThrottle::ResolveDeferredResult(
bool proceed,
std::optional<ThrottleCheckResult> result) {
// Ensure that `proceed` and `result` are consistent with each other.
CHECK(proceed || (result.has_value() && result->action() != PROCEED));
switch (deferred_state_) {
case DeferredState::kNotDeferred:
NOTREACHED();
case DeferredState::kDeferredNotExposed:
// An asynchronous task finished before the next navigation event arrives.
// Remember the result only if the `proceed` is false, to return it when
// the next event arrives. If the `proceed` is true, `result` may contain
// a junk.
if (!proceed) {
result_ = std::move(result);
}
deferred_state_ = DeferredState::kNotDeferred;
break;
case DeferredState::kDeferredExposed:
// An asynchronous task triggered finished after the next navigation event
// arrives. The throttle runner is suspended.
deferred_state_ = DeferredState::kNotDeferred;
if (proceed) {
// If the asynchronous task allows to proceed, re-process the next
// navigation event now after previously immediately deferring it,
// and resume the runner with the throttle's result.
// As `ProcessEvent()` can hide the internal DEFER always, there is no
// case we need to expose DEFER below.
result = ProcessEvent(pending_event_);
CHECK_NE(DEFER, result->action());
proceed = result->action() == PROCEED;
}
if (proceed) {
if (deferred_result_callback_) {
deferred_result_callback_->Run(proceed, std::nullopt);
} else {
Resume();
}
} else {
if (deferred_result_callback_) {
deferred_result_callback_->Run(proceed, result);
} else {
CancelDeferredNavigation(*result);
}
}
break;
}
}
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