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fix(extension): verify fill results before reporting success
This commit is contained in:
drakezhang
@@ -609,6 +609,36 @@ type SelectMutationResult =
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// tool.fill
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// ---------------------------------------------------------------------------
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interface FillPreparation {
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before?: string;
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expected?: string;
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valueLength?: number;
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error?: string;
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}
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interface FillScriptReply<T> {
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result?: { value?: T };
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exceptionDetails?: unknown;
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}
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const FILL_EDITABLE_FUNCTION = `function() {
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const tag = this.tagName.toLowerCase();
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const supported = tag === 'input'
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? ['text', 'search', 'tel', 'url', 'email', 'password', 'number'].includes(this.type)
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: tag === 'textarea' || this.isContentEditable;
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return this.isConnected && supported && !this.readOnly && !this.matches(':disabled');
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}`;
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// Chrome renders a trailing editable newline with an empty <div><br></div>.
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// innerText includes the padding break; it is not an extra typed character.
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const FILL_VALUE_FUNCTION = `function() {
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if (!this.isContentEditable) return this.value;
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const value = this.innerText;
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const tail = this.lastChild;
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const padding = tail && tail.nodeName === 'DIV' && tail.childNodes.length === 1 && tail.firstChild.nodeName === 'BR';
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return padding && value.endsWith('\\n\\n') ? value.slice(0, -1) : value;
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}`;
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export async function handleFill(
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manager: SessionManager,
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params: FillParams,
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@@ -678,57 +708,172 @@ export async function handleFill(
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const clearBefore = params.clear_before ?? true;
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try {
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if (clearBefore) {
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// Clear input/textarea value or wipe contenteditable innerText,
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// then fire `input` so frameworks observe the empty state.
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await nodeCdp.send(target.tabId, "Runtime.callFunctionOn", {
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objectId,
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functionDeclaration: `function() {
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if (this.isContentEditable) { this.textContent = ''; }
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else {
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const proto = this instanceof HTMLTextAreaElement
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? HTMLTextAreaElement.prototype
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: HTMLInputElement.prototype;
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const descriptor = Object.getOwnPropertyDescriptor(proto, 'value');
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if (descriptor && descriptor.set) descriptor.set.call(this, '');
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else this.value = '';
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}
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this.dispatchEvent(new Event('input', { bubbles: true }));
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}`,
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returnByValue: true,
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});
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}
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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// Check editability before clearing. Keep the expected result tied to
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// this object, including the existing value on the append path.
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const prepared = await nodeCdp.send<FillScriptReply<FillPreparation>>(
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target.tabId,
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"Runtime.callFunctionOn",
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{
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objectId,
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functionDeclaration: `function(value, clearBefore) {
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const tag = this.tagName.toLowerCase();
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const native = tag === 'input' || tag === 'textarea';
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if (!(${FILL_EDITABLE_FUNCTION}).call(this)) return { error: 'fill target is not editable or its input type is unsupported' };
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const focused = () => this.getRootNode().activeElement === this && this.ownerDocument.hasFocus();
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if (!focused()) return { error: 'fill target does not have focus' };
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const before = clearBefore ? '' : (${FILL_VALUE_FUNCTION}).call(this);
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if (!clearBefore && value !== '' && native && typeof this.selectionStart === 'number' &&
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(this.selectionStart !== before.length || this.selectionEnd !== before.length)) {
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return { error: 'fill append requires the caret at the end of the field' };
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}
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let expected = before + value;
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if (native) {
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// Use the browser's own value sanitization (e.g. textarea
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// line endings) without changing the live control.
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const normalizer = this.ownerDocument.createElement(tag);
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if (tag === 'input') {
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normalizer.type = this.type;
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normalizer.multiple = this.multiple;
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}
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// insertText treats line breaks in a single-line input as spaces.
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if (tag === 'input') expected = expected.replace(/\\r\\n|\\r|\\n/g, ' ');
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normalizer.value = expected;
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if (expected !== '' && normalizer.value === '' && this.type === 'number') {
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return { error: 'fill value is not valid for a number input' };
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}
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expected = normalizer.value;
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if (this.type !== 'number' && this.maxLength >= 0 && expected.length > this.maxLength) {
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return { error: 'fill value exceeds the target maxlength' };
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}
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} else {
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expected = expected.replace(/\\r\\n?/g, '\\n');
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}
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if (clearBefore) {
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if (native) {
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const proto = tag === 'textarea' ? HTMLTextAreaElement.prototype : HTMLInputElement.prototype;
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Object.getOwnPropertyDescriptor(proto, 'value').set.call(this, '');
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} else {
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this.textContent = '';
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}
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this.dispatchEvent(new Event('input', { bubbles: true }));
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}
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return { before, expected, valueLength: Math.max(0, expected.length - before.length) };
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}`,
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arguments: [{ value: params.value }, { value: clearBefore }],
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returnByValue: true,
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},
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);
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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if (prepared.exceptionDetails) {
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return { code: "cdp_failed", message: "fill preparation script failed" };
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}
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const preparation = prepared.result?.value;
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if (
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preparation?.error ||
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typeof preparation?.before !== "string" ||
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typeof preparation?.expected !== "string" ||
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typeof preparation.valueLength !== "number"
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) {
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return {
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code: "cdp_failed",
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message: preparation?.error ?? "fill preparation returned an unexpected result",
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};
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}
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// A separate call runs after the clearing event's microtasks drain.
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// Confirm the target before sending input to the focused element.
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const ready = await nodeCdp.send<FillScriptReply<boolean>>(
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target.tabId,
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"Runtime.callFunctionOn",
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{
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objectId,
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functionDeclaration: `function(before) {
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return (${FILL_EDITABLE_FUNCTION}).call(this) &&
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this.getRootNode().activeElement === this && this.ownerDocument.hasFocus() &&
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(${FILL_VALUE_FUNCTION}).call(this) === before;
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}`,
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arguments: [{ value: preparation.before }],
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returnByValue: true,
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},
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);
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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if (ready.exceptionDetails || ready.result?.value !== true) {
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return {
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code: "cdp_failed",
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message: "fill target changed, lost focus, or could not be checked before typing",
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};
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}
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// CDP `Input.insertText` handles IME / multi-byte input out of the
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// box, much more reliably than per-key `dispatchKeyEvent`.
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await deps.cdp.send(target.tabId, "Input.insertText", { text: params.value });
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if (params.value !== "") {
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await deps.cdp.send(target.tabId, "Input.insertText", { text: params.value });
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}
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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// Fire `input` + `change` so React / Vue controlled inputs commit.
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await nodeCdp.send(target.tabId, "Runtime.callFunctionOn", {
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objectId,
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functionDeclaration: `function() {
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this.dispatchEvent(new Event('input', { bubbles: true }));
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this.dispatchEvent(new Event('change', { bubbles: true }));
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}`,
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returnByValue: true,
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// Keep the existing notifications, then read in a separate call so
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// nested microtasks queued by the page cannot race the verification.
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const notified = await nodeCdp.send<FillScriptReply<unknown>>(
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target.tabId,
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"Runtime.callFunctionOn",
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{
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objectId,
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functionDeclaration: `function() {
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this.dispatchEvent(new Event('input', { bubbles: true }));
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this.dispatchEvent(new Event('change', { bubbles: true }));
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}`,
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returnByValue: true,
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},
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);
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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if (notified.exceptionDetails) {
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return { code: "cdp_failed", message: "fill notification script failed" };
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}
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const verified = await nodeCdp.send<FillScriptReply<boolean>>(
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target.tabId,
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"Runtime.callFunctionOn",
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{
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objectId,
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functionDeclaration: `function(expected) {
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return this.isConnected && (${FILL_VALUE_FUNCTION}).call(this) === expected;
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}`,
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arguments: [{ value: preparation.expected }],
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returnByValue: true,
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},
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);
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if (throwIfAborted(deps.signal)) {
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return { code: "cancelled", message: "fill aborted" };
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}
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if (verified.exceptionDetails || verified.result?.value !== true) {
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return {
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code: "cdp_failed",
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message: verified.exceptionDetails
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? "fill verification script failed"
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: "fill could not verify the expected value; observe the page before retrying",
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};
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}
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return attachDialogs(deps.cdp, target.tabId, dialogCursor, {
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tab_id: target.tabId,
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used_ref: node.usedRef,
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used_selector: node.usedSelector,
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value_length: preparation.valueLength,
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});
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} catch (err) {
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return {
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code: "cdp_failed",
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message: err instanceof Error ? err.message : String(err),
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};
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} finally {
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await nodeCdp.send(target.tabId, "Runtime.releaseObject", { objectId }).catch(() => undefined);
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}
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return attachDialogs(deps.cdp, target.tabId, dialogCursor, {
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tab_id: target.tabId,
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used_ref: node.usedRef,
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used_selector: node.usedSelector,
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value_length: params.value.length,
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});
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}
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// ---------------------------------------------------------------------------
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