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* Scraping Templates for Browser Hand
*
* Contains data scraping and extraction templates.
*/
import type { TaskTemplate, ExecutionContext } from './types';
// ============================================================================
// Template: Scrape Text
// ============================================================================
const scrapeTextTemplate: TaskTemplate = {
id: 'scrape_text',
name: '抓取页面文本',
description: '从多个选择器提取文本内容',
category: 'scraping',
icon: 'FileText',
params: [
{
key: 'url',
label: '网页地址',
type: 'url',
required: true,
placeholder: 'https://example.com',
},
{
key: 'selectors',
label: '选择器列表',
type: 'textarea',
required: true,
placeholder: '.title\n.description\n.price',
description: 'CSS 选择器（每行一个）',
},
{
key: 'waitFor',
label: '等待元素',
type: 'text',
required: false,
placeholder: '.content',
description: '等待此元素出现后再抓取',
},
],
execute: async (params, context: ExecutionContext) => {
const { browser, onProgress, onLog } = context;
const url = params.url as string;
const selectorsText = params.selectors as string;
const waitFor = params.waitFor as string | undefined;
const selectors = selectorsText.split('\n').map((s) => s.trim()).filter(Boolean);
onProgress('正在导航到页面...', 0);
onLog('info', `访问: ${url}`);
await browser.goto(url);
if (waitFor) {
onProgress('等待页面加载...', 20);
onLog('action', `等待元素: ${waitFor}`);
await browser.wait(waitFor, 10000);
}
onProgress('正在抓取文本...', 50);
const result: Record<string, string | string[]> = {};
for (let i = 0; i < selectors.length; i++) {
const selector = selectors[i];
const progress = 50 + Math.floor((i / selectors.length) * 40);
onProgress(`正在抓取 ${i + 1}/${selectors.length}...`, progress);
try {
// Try to get multiple elements first
const multipleResult = await browser.eval(`
(selector) => {
const elements = document.querySelectorAll(selector);
if (elements.length > 1) {
return Array.from(elements).map(el => el.textContent?.trim() || '');
} else if (elements.length === 1) {
return elements[0].textContent?.trim() || '';
}
return null;
}
`, [selector]);
if (multipleResult !== null) {
result[selector] = multipleResult as string | string[];
onLog('info', `抓取成功: ${selector}`);
} else {
result[selector] = '';
onLog('warn', `未找到元素: ${selector}`);
}
} catch (error) {
result[selector] = '';
onLog('error', `抓取失败: ${selector}`, { error: String(error) });
}
}
onProgress('完成', 100);
return { url: await browser.url(), data: result };
},
};
// ============================================================================
// Template: Scrape List
// ============================================================================
const scrapeListTemplate: TaskTemplate = {
id: 'scrape_list',
name: '提取列表数据',
description: '从重复元素中批量提取结构化数据',
category: 'scraping',
icon: 'List',
params: [
{
key: 'url',
label: '网页地址',
type: 'url',
required: true,
placeholder: 'https://example.com/products',
},
{
key: 'itemSelector',
label: '列表项选择器',
type: 'text',
required: true,
placeholder: '.product-item',
description: '每个列表项的 CSS 选择器',
},
{
key: 'fieldMappings',
label: '字段映射',
type: 'json',
required: true,
default: {},
description: 'JSON 对象，映射字段名到选择器',
placeholder: '{"title": ".title", "price": ".price", "link": "a@href"}',
},
{
key: 'limit',
label: '最大数量',
type: 'number',
required: false,
default: 50,
min: 1,
max: 500,
description: '最多提取多少条数据',
},
],
execute: async (params, context: ExecutionContext) => {
const { browser, onProgress, onLog } = context;
const url = params.url as string;
const itemSelector = params.itemSelector as string;
const fieldMappings = params.fieldMappings as Record<string, string>;
const limit = (params.limit as number) ?? 50;
onProgress('正在导航到页面...', 0);
onLog('info', `访问: ${url}`);
await browser.goto(url);
onProgress('等待列表加载...', 30);
await browser.wait(itemSelector, 10000);
onProgress('正在提取列表数据...', 50);
const scrapingScript = `
({ itemSelector, fieldMappings, limit }) => {
const items = document.querySelectorAll(itemSelector);
const results = [];
for (let i = 0; i < Math.min(items.length, limit); i++) {
const item = items[i];
const row = {};
for (const [field, selector] of Object.entries(fieldMappings)) {
// Handle attribute selectors like "a@href"
const parts = selector.split('@');
const cssSelector = parts[0];
const attr = parts[1];
const el = item.querySelector(cssSelector);
if (el) {
if (attr) {
row[field] = el.getAttribute(attr) || '';
} else {
row[field] = el.textContent?.trim() || '';
}
} else {
row[field] = '';
}
}
results.push(row);
}
return results;
}
`;
const result = await browser.eval(scrapingScript, [{
itemSelector,
fieldMappings,
limit,
}]);
const items = result as Array<Record<string, string>>;
onLog('info', `提取了 ${items.length} 条数据`);
onProgress('完成', 100);
return {
url: await browser.url(),
count: items.length,
data: items,
};
},
};
// ============================================================================
// Template: Scrape Images
// ============================================================================
const scrapeImagesTemplate: TaskTemplate = {
id: 'scrape_images',
name: '抓取图片列表',
description: '提取页面中的图片 URL',
category: 'scraping',
icon: 'Image',
params: [
{
key: 'url',
label: '网页地址',
type: 'url',
required: true,
placeholder: 'https://example.com/gallery',
},
{
key: 'imageSelector',
label: '图片选择器',
type: 'text',
required: false,
default: 'img',
placeholder: 'img.gallery-image',
description: '图片元素的 CSS 选择器',
},
{
key: 'minWidth',
label: '最小宽度',
type: 'number',
required: false,
default: 100,
description: '忽略小于此宽度的图片',
},
{
key: 'minHeight',
label: '最小高度',
type: 'number',
required: false,
default: 100,
description: '忽略小于此高度的图片',
},
],
execute: async (params, context: ExecutionContext) => {
const { browser, onProgress, onLog } = context;
const url = params.url as string;
const imageSelector = (params.imageSelector as string) ?? 'img';
const minWidth = (params.minWidth as number) ?? 100;
const minHeight = (params.minHeight as number) ?? 100;
onProgress('正在导航到页面...', 0);
onLog('info', `访问: ${url}`);
await browser.goto(url);
onProgress('正在提取图片...', 50);
const extractScript = `
({ imageSelector, minWidth, minHeight }) => {
const images = document.querySelectorAll(imageSelector);
const results = [];
images.forEach(img => {
const width = img.naturalWidth || img.width;
const height = img.naturalHeight || img.height;
if (width >= minWidth && height >= minHeight) {
results.push({
src: img.src,
alt: img.alt || '',
width,
height,
});
}
});
return results;
}
`;
const result = await browser.eval(extractScript, [{
imageSelector,
minWidth,
minHeight,
}]);
const images = result as Array<{
src: string;
alt: string;
width: number;
height: number;
}>;
onLog('info', `找到 ${images.length} 张图片`);
onProgress('完成', 100);
return {
url: await browser.url(),
count: images.length,
images,
};
},
};
// ============================================================================
// Template: Scrape Links
// ============================================================================
const scrapeLinksTemplate: TaskTemplate = {
id: 'scrape_links',
name: '抓取链接列表',
description: '提取页面中的所有链接',
category: 'scraping',
icon: 'Link',
params: [
{
key: 'url',
label: '网页地址',
type: 'url',
required: true,
placeholder: 'https://example.com',
},
{
key: 'linkSelector',
label: '链接选择器',
type: 'text',
required: false,
default: 'a[href]',
placeholder: 'a[href]',
description: '链接元素的 CSS 选择器',
},
{
key: 'filterPattern',
label: 'URL 过滤',
type: 'text',
required: false,
placeholder: 'example.com',
description: '只保留包含此文本的链接',
},
{
key: 'excludePattern',
label: '排除模式',
type: 'text',
required: false,
placeholder: '#, javascript:',
description: '排除包含此文本的链接',
},
],
execute: async (params, context: ExecutionContext) => {
const { browser, onProgress, onLog } = context;
const url = params.url as string;
const linkSelector = (params.linkSelector as string) ?? 'a[href]';
const filterPattern = params.filterPattern as string | undefined;
const excludePattern = params.excludePattern as string | undefined;
onProgress('正在导航到页面...', 0);
onLog('info', `访问: ${url}`);
await browser.goto(url);
onProgress('正在提取链接...', 50);
const extractScript = `
({ linkSelector, filterPattern, excludePattern }) => {
const links = document.querySelectorAll(linkSelector);
const results = [];
const seen = new Set();
links.forEach(a => {
const href = a.href;
const text = a.textContent?.trim() || '';
if (!href || seen.has(href)) return;
// Apply filter
if (filterPattern && !href.includes(filterPattern) && !text.includes(filterPattern)) {
return;
}
// Apply exclude
if (excludePattern) {
const patterns = excludePattern.split(',').map(p => p.trim());
for (const p of patterns) {
if (href.includes(p)) return;
}
}
seen.add(href);
results.push({ href, text });
});
return results;
}
`;
const result = await browser.eval(extractScript, [{
linkSelector,
filterPattern,
excludePattern,
}]);
const links = result as Array<{ href: string; text: string }>;
onLog('info', `找到 ${links.length} 个链接`);
onProgress('完成', 100);
return {
url: await browser.url(),
count: links.length,
links,
};
},
};
// ============================================================================
// Template: Scrape Table
// ============================================================================
const scrapeTableTemplate: TaskTemplate = {
id: 'scrape_table',
name: '抓取表格数据',
description: '从 HTML 表格中提取数据',
category: 'scraping',
icon: 'Table',
params: [
{
key: 'url',
label: '网页地址',
type: 'url',
required: true,
placeholder: 'https://example.com/data',
},
{
key: 'tableSelector',
label: '表格选择器',
type: 'text',
required: false,
default: 'table',
placeholder: 'table.data-table',
description: '表格元素的 CSS 选择器',
},
{
key: 'headerRow',
label: '表头行',
type: 'number',
required: false,
default: 1,
min: 0,
max: 10,
description: '表头所在行（0 表示无表头）',
},
],
execute: async (params, context: ExecutionContext) => {
const { browser, onProgress, onLog } = context;
const url = params.url as string;
const tableSelector = (params.tableSelector as string) ?? 'table';
const headerRow = (params.headerRow as number) ?? 1;
onProgress('正在导航到页面...', 0);
onLog('info', `访问: ${url}`);
await browser.goto(url);
onProgress('正在提取表格数据...', 50);
const extractScript = `
({ tableSelector, headerRow }) => {
const table = document.querySelector(tableSelector);
if (!table) return { headers: [], rows: [] };
const allRows = table.querySelectorAll('tr');
// Extract headers
let headers = [];
if (headerRow > 0 && allRows[headerRow - 1]) {
const headerCells = allRows[headerRow - 1].querySelectorAll('th, td');
headers = Array.from(headerCells).map(cell => cell.textContent?.trim() || '');
}
// Extract data rows
const startRow = headerRow > 0 ? headerRow : 0;
const rows = [];
for (let i = startRow; i < allRows.length; i++) {
const cells = allRows[i].querySelectorAll('td, th');
const rowData = Array.from(cells).map(cell => cell.textContent?.trim() || '');
if (rowData.some(d => d)) { // Skip empty rows
rows.push(rowData);
}
}
return { headers, rows };
}
`;
const result = await browser.eval(extractScript, [{ tableSelector, headerRow }]) as {
headers: string[];
rows: string[][];
};
onLog('info', `提取了 ${result.rows.length} 行数据，${result.headers.length} 列`);
onProgress('完成', 100);
return {
url: await browser.url(),
headers: result.headers,
rowCount: result.rows.length,
data: result.rows,
};
},
};
// ============================================================================
// Export All Scraping Templates
// ============================================================================
export const scrapingTemplates: TaskTemplate[] = [
scrapeTextTemplate,
scrapeListTemplate,
scrapeImagesTemplate,
scrapeLinksTemplate,
scrapeTableTemplate,
];
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