Andras Schmelczer
e9b6035c58
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81 lines
2.6 KiB
TypeScript
81 lines
2.6 KiB
TypeScript
import rss from '@astrojs/rss';
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import type { APIRoute } from 'astro';
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import ogDefault from '../assets/og-default.jpg';
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import {
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absoluteUrl,
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articlePath,
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entrySlug,
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getPublishedPosts,
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optimizeOgImage,
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site,
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} from '../lib/site';
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// Escape characters that would otherwise break XML parsing inside text nodes
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// (the `customData` strings are inserted as-is by @astrojs/rss).
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function escapeXml(value: string) {
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return value
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, ''');
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}
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// Format a Date as `YYYY-MM-DD` in UTC for use inside tag: URIs.
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function isoDate(date: Date) {
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return date.toISOString().slice(0, 10);
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}
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export const GET: APIRoute = async (context) => {
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const posts = await getPublishedPosts();
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const feedUrl = absoluteUrl('/rss.xml');
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const channelImage = await optimizeOgImage(ogDefault);
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const channelImageUrl = absoluteUrl(channelImage.src);
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const creator = escapeXml(site.name);
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return rss({
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title: site.name,
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description: site.description,
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site: context.site ?? site.url,
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xmlns: {
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atom: 'http://www.w3.org/2005/Atom',
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content: 'http://purl.org/rss/1.0/modules/content/',
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dc: 'http://purl.org/dc/elements/1.1/',
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},
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customData: [
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'<language>en-us</language>',
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`<lastBuildDate>${new Date().toUTCString()}</lastBuildDate>`,
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`<atom:link href="${feedUrl}" rel="self" type="application/rss+xml" />`,
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'<image>',
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` <url>${channelImageUrl}</url>`,
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` <title>${escapeXml(site.name)}</title>`,
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` <link>${site.url}</link>`,
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'</image>',
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].join('\n'),
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items: posts.map((post) => {
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const url = absoluteUrl(articlePath(post));
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// Stable tag: URI keeps the GUID constant across path renames
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// (e.g. the `/writing/` → `/articles/` migration). The date is the
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// original publish date so re-publishing won't change the GUID.
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const guid = `tag:schmelczer.dev,${isoDate(post.data.date)}:posts/${entrySlug(post)}`;
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const updated = post.data.updated
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? `<atom:updated>${post.data.updated.toISOString()}</atom:updated>`
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: '';
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return {
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title: post.data.title,
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description: post.data.description,
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pubDate: post.data.date,
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link: url,
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author: `${site.email} (${site.name})`,
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categories: [...post.data.tags],
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customData: [
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`<guid isPermaLink="false">${escapeXml(guid)}</guid>`,
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`<dc:creator>${creator}</dc:creator>`,
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updated,
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]
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.filter(Boolean)
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.join('\n'),
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};
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}),
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});
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};
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