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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/renderer/wallet/boarding_pass_extractor.h"
#include "base/metrics/histogram_macros.h"
#include "chrome/common/chrome_isolated_world_ids.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_thread.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/public/platform/scheduler/web_agent_group_scheduler.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/web/web_script_source.h"
#include "v8/include/v8-isolate.h"
namespace wallet {
namespace {
const std::string GetDefaultExtractionScript() {
std::string script = R"###(
// Check if the str contains 'boarding pass'.
function containBoardingPass(str) {
return str.toLowerCase().replace(/\s+/g, '').includes('boardingpass');
}
// Scale up the base64 encoded image to be detectable by BarcodeDetector.
function scaleUpIfNeeded(img) {
if (img.src.startsWith('data:image/')
&& (img.width < 500 || image.height < 500)) {
let canvas = new OffscreenCanvas(500, 500);
let ctx = canvas.getContext('2d');
ctx.ImageSmoothingEnabled = false;
ctx.drawImage(img, 0, 0, 500, 500);
return canvas;
}
return img;
}
// Check if the rawValue is a valid BCBP string.
function isValidBoardingPass(rawValue) {
return rawValue.length > 60 && /^M[1-9]/.test(rawValue);
}
// Detect and decode boarding passes on current web page.
async function detectBoardingPass() {
var results = [];
// Check if BarcodeDetector is supported by current browser.
if (!'BarcodeDetector' in window) {
return [];
}
// Check if current URL or page title contains 'boarding pass'.
if (!containBoardingPass(window.location.href)
&& !containBoardingPass(document.title)) {
return [];
}
var detector;
try {
detector = new BarcodeDetector();
} catch (error) {
return [];
}
for (let i = 0; i < document.images.length; ++i) {
try {
const barcodes = await detector.detect(
scaleUpIfNeeded(document.images[i]));
for (const barcode of barcodes) {
// Check if it's a valid boarding pass
if (barcode.rawValue
&& isValidBoardingPass(barcode.rawValue)) {
results.push(barcode.rawValue);
}
}
} catch (error) {
}
}
return results;
}
detected_results_promise = detectBoardingPass();
)###";
return script;
}
std::vector<std::string> ConvertResultsToStrings(base::Value& value) {
std::vector<std::string> results;
if (!value.is_list()) {
return results;
}
for (const auto& item : value.GetList()) {
if (!item.is_string()) {
continue;
}
results.push_back(item.GetString());
}
return results;
}
} // namespace
BoardingPassExtractor::BoardingPassExtractor(
content::RenderFrame* render_frame,
service_manager::BinderRegistry* registry)
: content::RenderFrameObserver(render_frame) {
// Being a RenderFrameObserver, this object is scoped to the RenderFrame.
// Unretained is safe here because `registry` is also scoped to the
// RenderFrame.
registry->AddInterface(base::BindRepeating(
&BoardingPassExtractor::BindReceiver, base::Unretained(this)));
mojo::Remote<ukm::mojom::UkmRecorderFactory> factory;
content::RenderThread::Get()->BindHostReceiver(
factory.BindNewPipeAndPassReceiver());
ukm_recorder_ = ukm::MojoUkmRecorder::Create(*factory);
}
BoardingPassExtractor::~BoardingPassExtractor() = default;
void BoardingPassExtractor::BindReceiver(
mojo::PendingReceiver<mojom::BoardingPassExtractor> receiver) {
receiver_.reset();
receiver_.Bind(std::move(receiver));
}
void BoardingPassExtractor::OnDestruct() {
delete this;
}
void BoardingPassExtractor::ExtractBoardingPass(
ExtractBoardingPassCallback callback) {
ExtractBoardingPassWithScript(GetDefaultExtractionScript(),
std::move(callback));
}
void BoardingPassExtractor::ExtractBoardingPassWithScript(
const std::string& script,
ExtractBoardingPassCallback callback) {
blink::WebLocalFrame* main_frame = render_frame()->GetWebFrame();
v8::HandleScope handle_scope(main_frame->GetAgentGroupScheduler()->Isolate());
blink::WebScriptSource source =
blink::WebScriptSource(blink::WebString::FromUTF8(script));
main_frame->RequestExecuteScript(
ISOLATED_WORLD_ID_CHROME_INTERNAL, base::span_from_ref(source),
blink::mojom::UserActivationOption::kDoNotActivate,
blink::mojom::EvaluationTiming::kAsynchronous,
blink::mojom::LoadEventBlockingOption::kDoNotBlock,
base::BindOnce(&BoardingPassExtractor::OnBoardingPassExtracted,
base::Unretained(this), std::move(callback)),
blink::BackForwardCacheAware::kAllow,
blink::mojom::WantResultOption::kWantResult,
blink::mojom::PromiseResultOption::kAwait);
}
void BoardingPassExtractor::OnBoardingPassExtracted(
ExtractBoardingPassCallback callback,
std::optional<base::Value> results,
base::TimeTicks start_time) {
std::vector<std::string> boarding_passes;
if (results.has_value()) {
boarding_passes = ConvertResultsToStrings(*results);
}
ukm::builders::Wallet_BoardingPassDetect(
render_frame()->GetWebFrame()->GetDocument().GetUkmSourceId())
.SetDetected(!boarding_passes.empty())
.Record(ukm_recorder_.get());
UMA_HISTOGRAM_BOOLEAN("Android.Wallet.BoardingPass.Detected",
!boarding_passes.empty());
std::move(callback).Run(std::move(boarding_passes));
}
} // namespace wallet
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