355 lines
11 KiB
TypeScript
355 lines
11 KiB
TypeScript
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import {assert, debugError} from '../helper';
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import * as path from 'path';
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import {ExecutionContext} from './ExecutionContext';
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import {Frame} from './FrameManager';
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export class JSHandle {
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_context: ExecutionContext;
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_session: any;
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_executionContextId: any;
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_objectId: any;
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_type: any;
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_subtype: any;
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_disposed: boolean;
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_protocolValue: { unserializableValue: any; value: any; objectId: any; };
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constructor(context: ExecutionContext, payload: any) {
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this._context = context;
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this._session = this._context._session;
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this._executionContextId = this._context._executionContextId;
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this._objectId = payload.objectId;
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this._type = payload.type;
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this._subtype = payload.subtype;
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this._disposed = false;
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this._protocolValue = {
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unserializableValue: payload.unserializableValue,
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value: payload.value,
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objectId: payload.objectId,
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};
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}
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executionContext(): ExecutionContext {
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return this._context;
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}
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toString(): string {
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if (this._objectId)
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return 'JSHandle@' + (this._subtype || this._type);
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return 'JSHandle:' + this._deserializeValue(this._protocolValue);
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}
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async getProperty(propertyName: string): Promise<JSHandle | null> {
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const objectHandle = await this._context.evaluateHandle((object, propertyName) => {
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const result = {__proto__: null};
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result[propertyName] = object[propertyName];
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return result;
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}, this, propertyName);
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const properties = await objectHandle.getProperties();
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const result = properties.get(propertyName) || null;
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await objectHandle.dispose();
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return result;
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}
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async getProperties(): Promise<Map<string, JSHandle>> {
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const response = await this._session.send('Runtime.getObjectProperties', {
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executionContextId: this._executionContextId,
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objectId: this._objectId,
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});
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const result = new Map();
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for (const property of response.properties)
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result.set(property.name, createHandle(this._context, property.value, null));
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return result;
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}
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_deserializeValue({unserializableValue, value}) {
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if (unserializableValue === 'Infinity')
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return Infinity;
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if (unserializableValue === '-Infinity')
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return -Infinity;
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if (unserializableValue === '-0')
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return -0;
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if (unserializableValue === 'NaN')
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return NaN;
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return value;
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}
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async jsonValue() {
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if (!this._objectId)
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return this._deserializeValue(this._protocolValue);
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const simpleValue = await this._session.send('Runtime.callFunction', {
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executionContextId: this._executionContextId,
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returnByValue: true,
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functionDeclaration: (e => e).toString(),
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args: [this._protocolValue],
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});
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return this._deserializeValue(simpleValue.result);
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}
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asElement(): ElementHandle | null {
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return null;
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}
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async dispose() {
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if (!this._objectId)
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return;
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this._disposed = true;
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await this._session.send('Runtime.disposeObject', {
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executionContextId: this._executionContextId,
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objectId: this._objectId,
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}).catch(error => {
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// Exceptions might happen in case of a page been navigated or closed.
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// Swallow these since they are harmless and we don't leak anything in this case.
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debugError(error);
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});
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}
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}
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export class ElementHandle extends JSHandle {
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_frame: Frame;
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_frameId: any;
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constructor(frame: Frame, context: ExecutionContext, payload: any) {
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super(context, payload);
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this._frame = frame;
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this._frameId = frame._frameId;
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}
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async contentFrame(): Promise<Frame | null> {
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const {frameId} = await this._session.send('Page.contentFrame', {
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frameId: this._frameId,
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objectId: this._objectId,
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});
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if (!frameId)
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return null;
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const frame = this._frame._frameManager.frame(frameId);
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return frame;
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}
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asElement(): ElementHandle {
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return this;
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}
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async boundingBox(): Promise<{ width: number; height: number; x: number; y: number; }> {
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return await this._session.send('Page.getBoundingBox', {
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frameId: this._frameId,
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objectId: this._objectId,
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});
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}
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async screenshot(options: { encoding?: string; path?: string; } = {}) {
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const clip = await this._session.send('Page.getBoundingBox', {
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frameId: this._frameId,
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objectId: this._objectId,
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});
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if (!clip)
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throw new Error('Node is either not visible or not an HTMLElement');
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assert(clip.width, 'Node has 0 width.');
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assert(clip.height, 'Node has 0 height.');
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await this._scrollIntoViewIfNeeded();
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return await this._frame._page.screenshot(Object.assign({}, options, {
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clip: {
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x: clip.x,
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y: clip.y,
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width: clip.width,
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height: clip.height,
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},
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}));
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}
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isIntersectingViewport(): Promise<boolean> {
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return this._frame.evaluate(async element => {
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const visibleRatio = await new Promise(resolve => {
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const observer = new IntersectionObserver(entries => {
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resolve(entries[0].intersectionRatio);
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observer.disconnect();
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});
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observer.observe(element);
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// Firefox doesn't call IntersectionObserver callback unless
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// there are rafs.
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requestAnimationFrame(() => {});
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});
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return visibleRatio > 0;
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}, this);
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}
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async $(selector: string): Promise<ElementHandle | null> {
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const handle = await this._frame.evaluateHandle(
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(element, selector) => element.querySelector(selector),
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this, selector
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);
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const element = handle.asElement();
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if (element)
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return element;
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await handle.dispose();
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return null;
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}
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async $$(selector: string): Promise<Array<ElementHandle>> {
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const arrayHandle = await this._frame.evaluateHandle(
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(element, selector) => element.querySelectorAll(selector),
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this, selector
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);
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const properties = await arrayHandle.getProperties();
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await arrayHandle.dispose();
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const result = [];
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for (const property of properties.values()) {
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const elementHandle = property.asElement();
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if (elementHandle)
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result.push(elementHandle);
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}
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return result;
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}
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async $eval(selector: string, pageFunction: Function | string, ...args: Array<any>): Promise<(object | undefined)> {
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const elementHandle = await this.$(selector);
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if (!elementHandle)
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throw new Error(`Error: failed to find element matching selector "${selector}"`);
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const result = await this._frame.evaluate(pageFunction, elementHandle, ...args);
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await elementHandle.dispose();
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return result;
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}
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async $$eval(selector: string, pageFunction: Function | string, ...args: Array<any>): Promise<(object | undefined)> {
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const arrayHandle = await this._frame.evaluateHandle(
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(element, selector) => Array.from(element.querySelectorAll(selector)),
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this, selector
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);
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const result = await this._frame.evaluate(pageFunction, arrayHandle, ...args);
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await arrayHandle.dispose();
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return result;
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}
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async $x(expression: string): Promise<Array<ElementHandle>> {
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const arrayHandle = await this._frame.evaluateHandle(
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(element, expression) => {
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const document = element.ownerDocument || element;
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const iterator = document.evaluate(expression, element, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE);
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const array = [];
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let item;
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while ((item = iterator.iterateNext()))
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array.push(item);
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return array;
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},
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this, expression
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);
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const properties = await arrayHandle.getProperties();
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await arrayHandle.dispose();
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const result = [];
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for (const property of properties.values()) {
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const elementHandle = property.asElement();
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if (elementHandle)
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result.push(elementHandle);
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}
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return result;
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}
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async _scrollIntoViewIfNeeded() {
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const error = await this._frame.evaluate(async element => {
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if (!element.isConnected)
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return 'Node is detached from document';
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if (element.nodeType !== Node.ELEMENT_NODE)
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return 'Node is not of type HTMLElement';
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const visibleRatio = await new Promise(resolve => {
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const observer = new IntersectionObserver(entries => {
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resolve(entries[0].intersectionRatio);
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observer.disconnect();
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});
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observer.observe(element);
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// Firefox doesn't call IntersectionObserver callback unless
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// there are rafs.
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requestAnimationFrame(() => {});
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});
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if (visibleRatio !== 1.0)
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element.scrollIntoView({block: 'center', inline: 'center', behavior: 'instant'});
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return false;
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}, this);
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if (error)
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throw new Error(error);
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}
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async click(options: { delay?: number; button?: string; clickCount?: number; } | undefined) {
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await this._scrollIntoViewIfNeeded();
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const {x, y} = await this._clickablePoint();
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await this._frame._page.mouse.click(x, y, options);
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}
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async uploadFile(...filePaths: Array<string>) {
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const files = filePaths.map(filePath => path.resolve(filePath));
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await this._session.send('Page.setFileInputFiles', {
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frameId: this._frameId,
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objectId: this._objectId,
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files,
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});
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}
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async hover() {
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await this._scrollIntoViewIfNeeded();
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const {x, y} = await this._clickablePoint();
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await this._frame._page.mouse.move(x, y);
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}
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async focus() {
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await this._frame.evaluate(element => element.focus(), this);
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}
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async type(text: string, options: { delay: (number | undefined); } | undefined) {
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await this.focus();
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await this._frame._page.keyboard.type(text, options);
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}
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async press(key: string, options: { delay?: number; } | undefined) {
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await this.focus();
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await this._frame._page.keyboard.press(key, options);
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}
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async _clickablePoint(): Promise<{ x: number; y: number; }> {
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const result = await this._session.send('Page.getContentQuads', {
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frameId: this._frameId,
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objectId: this._objectId,
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}).catch(debugError);
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if (!result || !result.quads.length)
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throw new Error('Node is either not visible or not an HTMLElement');
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// Filter out quads that have too small area to click into.
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const quads = result.quads.filter(quad => computeQuadArea(quad) > 1);
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if (!quads.length)
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throw new Error('Node is either not visible or not an HTMLElement');
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// Return the middle point of the first quad.
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return computeQuadCenter(quads[0]);
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}
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}
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export function createHandle(context: ExecutionContext, result: any, exceptionDetails?: any) {
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const frame = context.frame();
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if (exceptionDetails) {
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if (exceptionDetails.value)
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throw new Error('Evaluation failed: ' + JSON.stringify(exceptionDetails.value));
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else
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throw new Error('Evaluation failed: ' + exceptionDetails.text + '\n' + exceptionDetails.stack);
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}
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return result.subtype === 'node' ? new ElementHandle(frame, context, result) : new JSHandle(context, result);
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}
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function computeQuadArea(quad) {
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// Compute sum of all directed areas of adjacent triangles
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// https://en.wikipedia.org/wiki/Polygon#Simple_polygons
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let area = 0;
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const points = [quad.p1, quad.p2, quad.p3, quad.p4];
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for (let i = 0; i < points.length; ++i) {
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const p1 = points[i];
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const p2 = points[(i + 1) % points.length];
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area += (p1.x * p2.y - p2.x * p1.y) / 2;
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}
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return Math.abs(area);
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}
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function computeQuadCenter(quad) {
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let x = 0, y = 0;
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for (const point of [quad.p1, quad.p2, quad.p3, quad.p4]) {
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x += point.x;
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y += point.y;
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}
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return {x: x / 4, y: y / 4};
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}
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