feat: add SEO validation utility

2026-03-06 12:09:18 +08:00
parent 69dc3f2da6
commit b6084ec01a
1 changed files with 134 additions and 0 deletions
@@ -0,0 +1,134 @@
+import { Page } from '@playwright/test';
+import { SEOResult, MetaTagResult, HeadingResult, LinkResult, ImageResult } from '../../types';
+
+export class SEOValidator {
+  constructor(private page: Page) {}
+
+  async validateSEO(): Promise<SEOResult> {
+    const metaTags = await this.validateMetaTags();
+    const headings = await this.validateHeadings();
+    const links = await this.validateLinks();
+    const images = await this.validateImages();
+
+    const score = this.calculateScore(metaTags, headings, links, images);
+
+    return {
+      score,
+      metaTags,
+      headings,
+      links,
+      images
+    };
+  }
+
+  async validateMetaTags(): Promise<MetaTagResult> {
+    const title = await this.page.title();
+    const description = await this.page.getAttribute('meta[name="description"]', 'content');
+    const keywords = await this.page.getAttribute('meta[name="keywords"]', 'content');
+    const ogTitle = await this.page.getAttribute('meta[property="og:title"]', 'content');
+    const ogDescription = await this.page.getAttribute('meta[property="og:description"]', 'content');
+    const canonical = await this.page.getAttribute('link[rel="canonical"]', 'href');
+
+    return {
+      title: !!title && title.length >= 10 && title.length <= 60,
+      description: !!description && description.length >= 50 && description.length <= 160,
+      keywords: !!keywords,
+      ogTitle: !!ogTitle,
+      ogDescription: !!ogDescription,
+      canonical: !!canonical
+    };
+  }
+
+  async validateHeadings(): Promise<HeadingResult> {
+    const h1Count = await this.page.locator('h1').count();
+    const hasH1 = h1Count > 0;
+    const multipleH1 = h1Count > 1;
+
+    const headings = await this.page.evaluate(() => {
+      const elements = document.querySelectorAll('h1, h2, h3, h4, h5, h6');
+      return Array.from(elements).map(el => el.tagName);
+    });
+
+    let headingStructure = true;
+    let previousLevel = 0;
+    for (const heading of headings) {
+      const level = parseInt(heading.charAt(1));
+      if (level > previousLevel + 1) {
+        headingStructure = false;
+        break;
+      }
+      previousLevel = level;
+    }
+
+    return {
+      hasH1,
+      headingStructure,
+      multipleH1
+    };
+  }
+
+  async validateLinks(): Promise<LinkResult> {
+    const links = await this.page.locator('a').all();
+    let internal = 0;
+    let external = 0;
+    let broken = 0;
+
+    for (const link of links) {
+      const href = await link.getAttribute('href');
+      if (!href) continue;
+
+      if (href.startsWith('http')) {
+        external++;
+      } else {
+        internal++;
+      }
+    }
+
+    return {
+      total: links.length,
+      broken,
+      internal,
+      external
+    };
+  }
+
+  async validateImages(): Promise<ImageResult> {
+    const images = await this.page.locator('img').all();
+    let withAlt = 0;
+    let withoutAlt = 0;
+
+    for (const image of images) {
+      const alt = await image.getAttribute('alt');
+      if (alt && alt.trim() !== '') {
+        withAlt++;
+      } else {
+        withoutAlt++;
+      }
+    }
+
+    return {
+      total: images.length,
+      withAlt,
+      withoutAlt
+    };
+  }
+
+  private calculateScore(metaTags: MetaTagResult, headings: HeadingResult, links: LinkResult, images: ImageResult): number {
+    let score = 0;
+    let total = 0;
+
+    const metaTagValues = Object.values(metaTags);
+    score += metaTagValues.filter(v => v).length;
+    total += metaTagValues.length;
+
+    if (headings.hasH1) score++;
+    if (headings.headingStructure) score++;
+    if (!headings.multipleH1) score++;
+    total += 3;
+
+    if (images.withoutAlt === 0) score++;
+    total++;
+
+    return Math.round((score / total) * 100);
+  }
+}