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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 "third_party/blink/renderer/controller/javascript_call_stack_collector.h"
#include "third_party/blink/public/common/permissions_policy/document_policy_features.h"
#include "third_party/blink/public/common/scheme_registry.h"
#include "third_party/blink/public/common/tokens/tokens.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/platform/bindings/dom_wrapper_world.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/scheduler/public/main_thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/main_thread_scheduler.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_copier.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/wtf.h"
namespace WTF {
template <>
struct CrossThreadCopier<std::optional<blink::LocalFrameToken>>
: public CrossThreadCopierPassThrough<
std::optional<blink::LocalFrameToken>> {};
} // namespace WTF
namespace blink {
namespace {
// Determines whether a script frame should be included in the call stack.
// frames whose URL protocol matches an extension scheme are excluded.
// Returns true to include the frame (i.e. not redacted) and false to exclude
// it.
bool IsScriptFrameAllowed(v8::Isolate* isolate,
v8::Local<v8::String> script_name) {
String script_url =
ToCoreStringWithUndefinedOrNullCheck(isolate, script_name);
if (script_url.empty()) {
return true;
}
KURL url(script_url);
if (!url.IsValid()) {
return true;
}
return !CommonSchemeRegistry::IsExtensionScheme(url.Protocol().Ascii());
}
// Gathers and formats the call stack in a format that's
// consistent with Error.stack If extension frames are detected,
// we replace them with <redacted> to protect privacy.
// The function respects the stack trace limit set in the isolate.
void CollectFilteredCallStack(v8::Isolate* isolate, StringBuilder& builder) {
std::ostringstream oss;
v8::Message::PrintCurrentStackTrace(isolate, oss, &IsScriptFrameAllowed);
const std::string stack_trace = oss.str();
std::istringstream iss(stack_trace);
std::string line;
int processed_frames = 0;
const int stack_trace_limit = isolate->GetStackTraceLimit();
while (std::getline(iss, line) && processed_frames < stack_trace_limit) {
builder.Append(kStackFramePrefix);
builder.Append(base::as_byte_span(line));
processed_frames++;
}
}
void PostHandleCollectedCallStackTask(
JavaScriptCallStackCollector* collector,
WTF::StringBuilder& builder,
std::optional<LocalFrameToken> frame_token = std::nullopt) {
DCHECK(Platform::Current());
PostCrossThreadTask(
*Platform::Current()->GetIOTaskRunner(), FROM_HERE,
WTF::CrossThreadBindOnce(
&JavaScriptCallStackCollector::HandleCallStackCollected,
WTF::CrossThreadUnretained(collector), builder.ReleaseString(),
frame_token));
}
void GenerateJavaScriptCallStack(v8::Isolate* isolate, void* data) {
CHECK(IsMainThread());
auto* collector = static_cast<JavaScriptCallStackCollector*>(data);
v8::HandleScope handle_scope(isolate);
WTF::StringBuilder builder;
if (!isolate->InContext()) {
PostHandleCollectedCallStackTask(collector, builder);
return;
}
v8::Local<v8::Context> context = isolate->GetCurrentContext();
ScriptState* script_state = ScriptState::MaybeFrom(isolate, context);
if (!script_state) {
PostHandleCollectedCallStackTask(collector, builder);
return;
}
ExecutionContext* execution_context = ToExecutionContext(script_state);
if (!RuntimeEnabledFeatures::
DocumentPolicyIncludeJSCallStacksInCrashReportsEnabled(
execution_context)) {
PostHandleCollectedCallStackTask(collector, builder);
return;
}
DOMWrapperWorld& world = script_state->World();
auto* execution_dom_window = DynamicTo<LocalDOMWindow>(execution_context);
LocalFrame* frame =
execution_dom_window ? execution_dom_window->GetFrame() : nullptr;
std::optional<LocalFrameToken> frame_token;
if (frame && world.IsMainWorld()) {
frame_token = frame->GetLocalFrameToken();
if (!execution_context->IsFeatureEnabled(
mojom::blink::DocumentPolicyFeature::
kIncludeJSCallStacksInCrashReports)) {
builder.Append(kWebsiteOwnerNotOptedInMessage);
} else {
UseCounter::Count(
execution_context,
WebFeature::kDocumentPolicyIncludeJSCallStacksInCrashReports);
CollectFilteredCallStack(isolate, builder);
}
}
PostHandleCollectedCallStackTask(collector, builder, frame_token);
}
} // namespace
void JavaScriptCallStackCollector::InterruptIsolateAndCollectCallStack(
v8::Isolate* isolate) {
if (has_interrupted_isolate_) {
return;
}
has_interrupted_isolate_ = true;
isolate->RequestInterrupt(&GenerateJavaScriptCallStack,
static_cast<void*>(this));
}
void JavaScriptCallStackCollector::HandleCallStackCollected(
const String& call_stack,
const std::optional<LocalFrameToken> frame_token) {
DCHECK(result_callback_);
std::move(result_callback_).Run(call_stack, frame_token);
DCHECK(finished_callback_);
std::move(finished_callback_).Run(this);
}
void JavaScriptCallStackCollector::CollectJavaScriptCallStack() {
Thread::MainThread()
->Scheduler()
->ToMainThreadScheduler()
->ForEachMainThreadIsolate(WTF::BindRepeating(
&JavaScriptCallStackCollector::InterruptIsolateAndCollectCallStack,
WTF::Unretained(this)));
}
} // namespace blink
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