113 lines
3.4 KiB
Go
113 lines
3.4 KiB
Go
package util
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import (
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"context"
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"fmt"
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"log"
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"os"
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"time"
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"github.com/chromedp/cdproto/emulation"
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"github.com/chromedp/cdproto/network"
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"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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)
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// ScreenshotURL 截图函数：传入网址、输出路径、宽高、四个边距和等待的元素 ID
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func ScreenshotURL(url, output string, width, height int, marginTop, marginRight, marginBottom, marginLeft int, waitClass string) error {
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// 创建一个上下文，连接到 Docker 中运行的 headless-shell 实例
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remoteAllocatorCtx, cancel := chromedp.NewRemoteAllocator(
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context.Background(), "ws://127.0.0.1:9222/json/ws",
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)
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defer cancel()
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ctx, cancel := chromedp.NewContext(remoteAllocatorCtx)
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defer cancel()
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// 设置超时时间，避免长时间无响应
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ctx, cancel = context.WithTimeout(ctx, 60*time.Second)
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defer cancel()
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// 设置页面的宽高和缩放
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if err := chromedp.Run(ctx, setViewportAndUserAgent(width, height, "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0")); err != nil {
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return fmt.Errorf("设置页面大小失败: %w", err)
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}
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// 启用网络请求拦截
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if err := chromedp.Run(ctx, enableRequestInterception()); err != nil {
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return fmt.Errorf("启用请求拦截失败: %w", err)
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}
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// 用于存储截图的变量
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var screenshot []byte
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queryAction := chromedp.WaitVisible(fmt.Sprintf(".%s", waitClass), chromedp.ByQuery)
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if waitClass == "" {
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queryAction = chromedp.WaitVisible(`body`, chromedp.ByQuery)
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}
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// 执行任务：打开网页并截图
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err := chromedp.Run(ctx,
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chromedp.Navigate(url), // 打开网页
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ignoreErrors(queryAction), // 等待指定元素
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chromedp.ActionFunc(func(ctx context.Context) error { // 自定义截图逻辑
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// 计算调整后的截图区域
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clip := &page.Viewport{
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X: float64(marginLeft),
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Y: float64(marginTop),
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Width: float64(width - marginLeft - marginRight),
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Height: float64(height - marginTop - marginBottom),
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Scale: 1.0,
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}
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var err error
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screenshot, err = page.CaptureScreenshot().WithClip(clip).Do(ctx)
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return err
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}),
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)
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if err != nil {
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return fmt.Errorf("截图失败: %w", err)
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}
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// 保存截图到本地
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if err := os.WriteFile(output, screenshot, 0644); err != nil {
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return fmt.Errorf("保存图片失败: %w", err)
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}
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return nil
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}
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func setViewportAndUserAgent(width, height int, userAgent string) chromedp.Tasks {
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return chromedp.Tasks{
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emulation.SetDeviceMetricsOverride(int64(width), int64(height), 1.0, false).
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WithScreenOrientation(&emulation.ScreenOrientation{
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Type: emulation.OrientationTypePortraitPrimary,
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Angle: 0,
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}),
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emulation.SetUserAgentOverride(userAgent),
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}
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}
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// enableRequestInterception 启用网络请求拦截，忽略不必要的资源加载（如广告、图片等）
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func enableRequestInterception() chromedp.Tasks {
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return chromedp.Tasks{
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chromedp.ActionFunc(func(ctx context.Context) error {
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return network.Enable().Do(ctx)
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}),
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network.SetBlockedURLS([]string{
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"pagead2.googlesyndication.com",
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"optimizationguide-pa.googleapis.com",
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}),
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}
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}
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// ignoreErrors 包裹 chromedp 任务，忽略执行过程中出现的错误
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func ignoreErrors(task chromedp.Action) chromedp.ActionFunc {
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return chromedp.ActionFunc(func(ctx context.Context) error {
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err := task.Do(ctx)
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if err != nil {
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log.Printf("忽略错误: %v", err)
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}
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return nil
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})
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}
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