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LibWeb/Clipboard: First draft of read_text
Not yet compilable, basic code structure present
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teaalltr
GitHub
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4 changed files with 145 additions and 2 deletions
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@ -17,6 +17,7 @@
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#include <LibWeb/Platform/EventLoopPlugin.h>
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#include <LibWeb/WebIDL/Promise.h>
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namespace Web::Clipboard {
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GC_DEFINE_ALLOCATOR(Clipboard);
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@ -140,6 +141,144 @@ static bool check_clipboard_write_permission(JS::Realm& realm)
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return false;
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}
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// https://w3c.github.io/clipboard-apis/#check-clipboard-write-permission
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static bool check_clipboard_read_permission(JS::Realm& realm)
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{
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// NOTE: The clipboard permission is undergoing a refactor because the clipboard-write permission was removed from
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// the Permissions spec. So this partially implements the proposed update:
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// https://pr-preview.s3.amazonaws.com/w3c/clipboard-apis/pull/164.html#write-permission
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// 1. Let hasGesture be true if the relevant global object of this has transient activation, false otherwise.
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auto has_gesture = as<HTML::Window>(realm.global_object()).has_transient_activation();
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// 2. If hasGesture then,
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if (has_gesture) {
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// FIXME: 1. Return true if the current script is running as a result of user interaction with a "Paste"
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// element created by the user agent or operating system.
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return true;
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}
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// 3. Otherwise, return false.
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return false;
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}
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// https://w3c.github.io/clipboard-apis/#dom-clipboard-readtext
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GC::Ref<WebIDL::Promise> Clipboard::read_text()
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{
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// 1. Let realm be this's relevant realm.
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auto& realm = HTML::relevant_realm(*this);
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// 2. Let p be a new promise in realm.
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auto promise = WebIDL::create_promise(realm);
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// 3. Run the following steps in parallel:
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Platform::EventLoopPlugin::the().deferred_invoke(GC::create_function(realm.heap(), [&realm, promise]() mutable {
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// 1. Let r be the result of running check clipboard write permission.
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auto result = check_clipboard_read_permission(realm);
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// 2. If r is false, then:
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if (!result) {
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// 1. Queue a global task on the permission task source, given realm’s global object, to reject p with
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// "NotAllowedError" DOMException in realm.
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queue_global_task(HTML::Task::Source::Permissions, realm.global_object(), GC::create_function(realm.heap(), [&realm, promise]() mutable {
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HTML::TemporaryExecutionContext execution_context { realm };
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WebIDL::reject_promise(realm, promise, WebIDL::NotAllowedError::create(realm, "Clipboard reading is only allowed through user activation"_string));
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}));
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// 2. Abort these steps.
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return;
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}
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// 3. TODO Let data be a copy of the system clipboard data.
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auto data = AK::Vector<SystemClipboardItem> {};
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// 4. Queue a global task on the clipboard task source, given realm’s global object, to perform the below steps:
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queue_global_task(HTML::Task::Source::Clipboard, realm.global_object(), GC::create_function(realm.heap(), [&realm, promise, data = move(data)]() mutable {
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// 1. For each systemClipboardItem in data:
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for (auto const& systemClipboardItem : data) {
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// 1. For each systemClipboardRepresentation in systemClipboardItem:
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for (auto const& systemClipboardRepresentation : systemClipboardItem.representations) {
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// 1. Let mimeType be the result of running the well-known mime type from os specific format algorithm given systemClipboardRepresentation’s name.
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auto mime_type = os_specific_well_known_format(systemClipboardRepresentation.name);
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// 2. If mimeType is null, continue this loop.
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if (mime_type.is_null())
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continue;
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// 3. Let representation be a new representation. NEW?? Or
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// Create the new representation object
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auto representation = ClipboardItem::Representation{};
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// 4. If representation’s MIME type essence is "text/plain", then:
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if (representation.mime_type == "text/plain"sv) {
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// 1. Set representation’s MIME type to mimeType.
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representation.mime_type = mime_type;
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// 2. Let representationDataPromise be the representation’s data.
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auto representationDataPromise = representation.data;// representation.data();
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// 3. React to representationDataPromise:
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WebIDL::react_to_promise(representationDataPromise,
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// 1. If representationDataPromise was fulfilled with value v, then:
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GC::create_function(realm.heap(), [&realm, promise](JS::Value v) -> WebIDL::ExceptionOr<JS::Value> {
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HTML::TemporaryExecutionContext execution_context { realm, HTML::TemporaryExecutionContext::CallbacksEnabled::Yes };
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// 1. If v is a DOMString, then follow the below steps:
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if (v.is_string()) {
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// 1. Resolve p with v.
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// 2. Return p.
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HTML::TemporaryExecutionContext execution_context { realm };
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WebIDL::resolve_promise(realm, promise, v);
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}
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// 2. If v is a Blob, then follow the below steps:
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if (v.is_object() && v.as_object().class_name() == "Blob") { // or "FileAPI::Blob" ?
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auto blob = dynamic_cast<FileAPI::Blob*>(&v.as_object());
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// 1. Let string be the result of UTF-8 decoding v’s underlying byte sequence.
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auto decoder = TextCodec::decoder_for("UTF-8"sv);
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auto string = MUST(TextCodec::convert_input_to_utf8_using_given_decoder_unless_there_is_a_byte_order_mark(*decoder, blob->raw_bytes()));
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// 2. Resolve p with string.
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// 3. Return p.
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HTML::TemporaryExecutionContext execution_context { realm };
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WebIDL::resolve_promise(realm, promise, JS::Value(string));
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}
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}),
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// 2. If representationDataPromise was rejected, then:
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GC::create_function(realm.heap(), [&realm, promise](JS::Value reason) -> WebIDL::ExceptionOr<JS::Value> {
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// 1. Reject p with "NotFoundError" DOMException in realm.
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// 2. Return p.
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HTML::TemporaryExecutionContext execution_context { realm };
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WebIDL::resolve_promise(realm, promise, WebIDL::NotFoundError::create(realm, "Clipboard data not found"_string));
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})
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);
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}
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}
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}
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// 2. Reject p with "NotFoundError" DOMException in realm.
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// 3. Return p.
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HTML::TemporaryExecutionContext execution_context { realm };
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WebIDL::resolve_promise(realm, promise, WebIDL::NotFoundError::create(realm, "Clipboard data not found"_string));
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}));
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}));
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}
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// https://w3c.github.io/clipboard-apis/#dom-clipboard-writetext
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GC::Ref<WebIDL::Promise> Clipboard::write_text(String data)
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{
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@ -23,6 +23,7 @@ public:
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static WebIDL::ExceptionOr<GC::Ref<Clipboard>> construct_impl(JS::Realm&);
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virtual ~Clipboard() override;
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GC::Ref<WebIDL::Promise> read_text();
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GC::Ref<WebIDL::Promise> write_text(String);
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private:
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@ -1,12 +1,13 @@
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#import <DOM/EventTarget.idl>
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// FIXME: typedef sequence<ClipboardItem> ClipboardItems;
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typedef sequence<ClipboardItem> ClipboardItems;
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// https://w3c.github.io/clipboard-apis/#clipboard
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[SecureContext, Exposed=Window]
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interface Clipboard : EventTarget {
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[FIXME] Promise<ClipboardItems> read();
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[FIXME] Promise<DOMString> readText();
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[FIXME] Promise<ClipboardItems> read(optional ClipboardUnsanitizedFormats formats = {});
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Promise<DOMString> readText();
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[FIXME] Promise<undefined> write(ClipboardItems data);
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Promise<undefined> writeText(DOMString data);
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};
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@ -50,6 +50,8 @@ public:
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static bool supports(JS::VM&, String const& type);
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Vector<Representation> representations() const& { return m_representations; }
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private:
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ClipboardItem(JS::Realm&);
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