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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.
#include "third_party/blink/renderer/modules/printing/web_printing_manager.h"
#include "printing/buildflags/buildflags.h"
#include "services/network/public/mojom/permissions_policy/permissions_policy_feature.mojom-shared.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/core/execution_context/navigator_base.h"
#include "third_party/blink/renderer/modules/printing/web_printer.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
namespace {
bool CheckContextAndPermissions(ScriptState* script_state,
ExceptionState& exception_state) {
if (!script_state->ContextIsValid()) {
exception_state.ThrowDOMException(DOMExceptionCode::kNotSupportedError,
"Current context is detached.");
return false;
}
ExecutionContext* execution_context = ExecutionContext::From(script_state);
if (!execution_context->IsIsolatedContext() ||
!execution_context->IsFeatureEnabled(
network::mojom::PermissionsPolicyFeature::kCrossOriginIsolated)) {
exception_state.ThrowDOMException(
DOMExceptionCode::kNotAllowedError,
"Frame is not sufficiently isolated to use Web Printing.");
return false;
}
if (!execution_context->IsFeatureEnabled(
network::mojom::PermissionsPolicyFeature::kWebPrinting)) {
exception_state.ThrowDOMException(
DOMExceptionCode::kNotAllowedError,
"Permissions-Policy: web-printing is disabled.");
return false;
}
return true;
}
} // namespace
const char WebPrintingManager::kSupplementName[] = "PrintingManager";
WebPrintingManager* WebPrintingManager::GetWebPrintingManager(
NavigatorBase& navigator) {
WebPrintingManager* printing_manager =
Supplement<NavigatorBase>::From<WebPrintingManager>(navigator);
if (!printing_manager) {
printing_manager = MakeGarbageCollected<WebPrintingManager>(navigator);
ProvideTo(navigator, printing_manager);
}
return printing_manager;
}
WebPrintingManager::WebPrintingManager(NavigatorBase& navigator)
: Supplement<NavigatorBase>(navigator),
printing_service_(navigator.GetExecutionContext()) {}
ScriptPromise<IDLSequence<WebPrinter>> WebPrintingManager::getPrinters(
ScriptState* script_state,
ExceptionState& exception_state) {
if (!CheckContextAndPermissions(script_state, exception_state)) {
return ScriptPromise<IDLSequence<WebPrinter>>();
}
auto* service = GetPrintingService();
if (!service) {
exception_state.ThrowSecurityError(
"WebPrinting API is not accessible in this configuration.");
return ScriptPromise<IDLSequence<WebPrinter>>();
}
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<IDLSequence<WebPrinter>>>(
script_state, exception_state.GetContext());
service->GetPrinters(resolver->WrapCallbackInScriptScope(WTF::BindOnce(
&WebPrintingManager::OnPrintersRetrieved, WrapPersistent(this))));
return resolver->Promise();
}
void WebPrintingManager::Trace(Visitor* visitor) const {
visitor->Trace(printing_service_);
ScriptWrappable::Trace(visitor);
Supplement<NavigatorBase>::Trace(visitor);
}
mojom::blink::WebPrintingService* WebPrintingManager::GetPrintingService() {
#if BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(USE_CUPS)
if (!printing_service_.is_bound()) {
auto* execution_context = GetSupplementable()->GetExecutionContext();
execution_context->GetBrowserInterfaceBroker().GetInterface(
printing_service_.BindNewPipeAndPassReceiver(
execution_context->GetTaskRunner(TaskType::kMiscPlatformAPI)));
}
return printing_service_.get();
#else
return nullptr;
#endif
}
void WebPrintingManager::OnPrintersRetrieved(
ScriptPromiseResolver<IDLSequence<WebPrinter>>* resolver,
mojom::blink::GetPrintersResultPtr result) {
if (result->is_error()) {
switch (result->get_error()) {
case mojom::blink::GetPrintersError::kUserPermissionDenied:
resolver->RejectWithDOMException(
DOMExceptionCode::kNotAllowedError,
"User denied access to Web Printing API.");
break;
}
return;
}
HeapVector<Member<WebPrinter>> printers;
for (auto& printer_info : result->get_printers()) {
printers.push_back(MakeGarbageCollected<WebPrinter>(
GetSupplementable()->GetExecutionContext(), std::move(printer_info)));
}
resolver->Resolve(printers);
}
} // namespace blink
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