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rss-reader.js
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341 lines (291 loc) · 9.33 KB
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/**
* RSS/Atom 订阅阅读器
* 支持解析和展示 RSS/Atom feed 内容
*/
class RSSReader {
constructor() {
this.cacheKey = 'rss-feed-cache';
this.cacheExpiry = 30 * 60 * 1000; // 30分钟缓存
this.feedUrls = [
{
name: '技术博客',
url: './blog/feed.xml',
enabled: true
},
{
name: '精选文章',
url: './blog/featured-feed.xml',
enabled: false
}
];
}
/**
* 获取缓存的 RSS 数据
*/
getCachedData(url) {
try {
const cached = localStorage.getItem(`${this.cacheKey}-${url}`);
if (!cached) return null;
const data = JSON.parse(cached);
const now = Date.now();
if (now - data.timestamp > this.cacheExpiry) {
localStorage.removeItem(`${this.cacheKey}-${url}`);
return null;
}
return data.content;
} catch (error) {
console.warn('读取 RSS 缓存失败:', error);
return null;
}
}
/**
* 缓存 RSS 数据
*/
cacheData(url, data) {
try {
const cacheEntry = {
timestamp: Date.now(),
content: data
};
localStorage.setItem(`${this.cacheKey}-${url}`, JSON.stringify(cacheEntry));
} catch (error) {
console.warn('缓存 RSS 数据失败:', error);
}
}
/**
* 解析 XML 字符串为 DOM 对象
*/
parseXML(xmlString) {
const parser = new DOMParser();
return parser.parseFromString(xmlString, 'text/xml');
}
/**
* 解析 RSS feed
*/
parseRSS(xmlDoc) {
const items = xmlDoc.querySelectorAll('item');
const articles = [];
items.forEach(item => {
const title = item.querySelector('title')?.textContent || '';
const link = item.querySelector('link')?.textContent || '';
const description = item.querySelector('description')?.textContent || '';
const pubDate = item.querySelector('pubDate')?.textContent || '';
const author = item.querySelector('author')?.textContent || '';
const category = item.querySelector('category')?.textContent || '';
// 从描述中提取纯文本
const plainDescription = this.stripHTML(description);
articles.push({
title: title.trim(),
link: link.trim(),
description: plainDescription.trim(),
pubDate: pubDate ? new Date(pubDate) : new Date(),
author: author.trim(),
category: category.trim(),
type: 'rss'
});
});
return articles;
}
/**
* 解析 Atom feed
*/
parseAtom(xmlDoc) {
const entries = xmlDoc.querySelectorAll('entry');
const articles = [];
entries.forEach(entry => {
const title = entry.querySelector('title')?.textContent || '';
const link = entry.querySelector('link')?.getAttribute('href') || '';
const content = entry.querySelector('content')?.textContent || entry.querySelector('summary')?.textContent || '';
const published = entry.querySelector('published')?.textContent || entry.querySelector('updated')?.textContent || '';
const author = entry.querySelector('author name')?.textContent || '';
const category = entry.querySelector('category')?.getAttribute('term') || '';
const plainDescription = this.stripHTML(content);
articles.push({
title: title.trim(),
link: link.trim(),
description: plainDescription.trim(),
pubDate: published ? new Date(published) : new Date(),
author: author.trim(),
category: category.trim(),
type: 'atom'
});
});
return articles;
}
/**
* 去除 HTML 标签，提取纯文本
*/
stripHTML(html) {
const temp = document.createElement('div');
temp.innerHTML = html;
return temp.textContent || temp.innerText || '';
}
/**
* 截取文本
*/
truncate(text, maxLength = 150) {
if (text.length <= maxLength) return text;
return text.substring(0, maxLength).trim() + '...';
}
/**
* 格式化日期
*/
formatDate(date) {
const now = new Date();
const diffTime = Math.abs(now - date);
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
if (diffDays === 0) {
const diffHours = Math.floor(diffTime / (1000 * 60 * 60));
if (diffHours === 0) {
const diffMinutes = Math.floor(diffTime / (1000 * 60));
return diffMinutes <= 1 ? '刚刚' : `${diffMinutes}分钟前`;
}
return `${diffHours}小时前`;
}
if (diffDays === 1) return '昨天';
if (diffDays < 7) return `${diffDays}天前`;
if (diffDays < 30) return `${Math.floor(diffDays / 7)}周前`;
if (diffDays < 365) return `${Math.floor(diffDays / 30)}月前`;
return `${Math.floor(diffDays / 365)}年前`;
}
/**
* 获取单个 feed
*/
async fetchFeed(feedConfig) {
try {
// 检查缓存
const cached = this.getCachedData(feedConfig.url);
if (cached) {
console.log(`使用缓存的 RSS 数据: ${feedConfig.name}`);
return cached;
}
// 获取新数据
console.log(`从 URL 获取 RSS 数据: ${feedConfig.url}`);
const response = await fetch(feedConfig.url);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const xmlText = await response.text();
const xmlDoc = this.parseXML(xmlText);
// 检测 feed 类型
const isRSS = xmlDoc.querySelector('rss');
const isAtom = xmlDoc.querySelector('feed');
let articles = [];
if (isRSS) {
articles = this.parseRSS(xmlDoc);
} else if (isAtom) {
articles = this.parseAtom(xmlDoc);
} else {
console.warn('无法识别的 feed 格式');
return [];
}
// 缓存数据
this.cacheData(feedConfig.url, articles);
return articles;
} catch (error) {
console.error(`获取 RSS feed 失败 (${feedConfig.name}):`, error);
return [];
}
}
/**
* 获取所有 feeds
*/
async fetchAllFeeds() {
const promises = this.feedUrls
.filter(feed => feed.enabled)
.map(feed => this.fetchFeed(feed));
const results = await Promise.all(promises);
// 合并所有文章并按日期排序
const allArticles = results.flat().sort((a, b) => b.pubDate - a.pubDate);
return allArticles;
}
/**
* 生成 feed XML (用于创建 RSS feed)
*/
generateFeedXML(articles, config = {}) {
const { title = 'CodeClub Blog', description = '技术博客', link = 'https://jacksoncode.github.io/blog/' } = config;
let xml = `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>${title}</title>
<description>${description}</description>
<link>${link}</link>
<atom:link href="${link}feed.xml" rel="self" type="application/rss+xml"/>
<language>zh-CN</language>
<lastBuildDate>${new Date().toUTCString()}</lastBuildDate>
`;
articles.forEach(article => {
xml += ` <item>
<title><![CDATA[${article.title}]]></title>
<link>${article.link}</link>
<description><![CDATA[${article.description}]]></description>
<pubDate>${article.pubDate.toUTCString()}</pubDate>
<author>${article.author}</author>
<category><![CDATA[${article.category}]]></category>
</item>
`;
});
xml += ` </channel>
</rss>`;
return xml;
}
/**
* 从 HTML 页面提取文章信息
*/
extractArticlesFromHTML(htmlContent) {
const parser = new DOMParser();
const doc = parser.parseFromString(htmlContent, 'text/html');
const articles = [];
// 提取文章卡片
const articleCards = doc.querySelectorAll('.post-card, .blog-post, article');
articleCards.forEach(card => {
const titleEl = card.querySelector('h1, h2, h3, .post-title, .blog-title');
const linkEl = card.querySelector('a[href]');
const excerptEl = card.querySelector('.post-excerpt, .blog-excerpt, p');
const dateEl = card.querySelector('.post-date, .blog-date, time');
const categoryEl = card.querySelector('.post-category, .blog-category');
if (titleEl && linkEl) {
articles.push({
title: titleEl.textContent.trim(),
link: linkEl.getAttribute('href'),
description: excerptEl ? excerptEl.textContent.trim() : '',
pubDate: dateEl ? new Date(dateEl.textContent.trim()) : new Date(),
author: 'Jackson',
category: categoryEl ? categoryEl.textContent.trim() : '技术博客',
type: 'html'
});
}
});
return articles;
}
/**
* 自动生成 RSS feed
*/
async generateRSSFromBlogPages() {
try {
const response = await fetch('./blog.html');
const htmlContent = await response.text();
const articles = this.extractArticlesFromHTML(htmlContent);
if (articles.length === 0) {
console.warn('未找到文章信息');
return;
}
// 生成 RSS XML
const rssXML = this.generateFeedXML(articles, {
title: 'CodeClub 技术博客',
description: '分享编程心得、技术文章和学习笔记',
link: 'https://jacksoncode.github.io/blog/'
});
return rssXML;
} catch (error) {
console.error('生成 RSS feed 失败:', error);
return null;
}
}
}
// 创建全局实例
const rssReader = new RSSReader();
// 导出供其他模块使用
if (typeof module !== 'undefined' && module.exports) {
module.exports = RSSReader;
}