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Add the blog app.

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git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4669 ed5197a5-7fde-0310-b194-c3ffbd925b24
This commit is contained in:
Cory McWilliams 2023-12-09 20:25:49 +00:00
parent 023731fc3f
commit ae2015a604
7 changed files with 312 additions and 0 deletions
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5
apps/blog.json Normal file
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{
"type": "tildefriends-app",
"emoji": "🪵",
"previous": "&CMKodqxRSDNxt/MMpYRysfN+6ArnEWaHUiE27J6BOIA=.sha256"
}

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apps/blog/app.js Normal file
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import * as blog from './blog.js';
async function main() {
let blogs = await blog.get_posts();
await app.setDocument(blog.render_html(blogs));
}
main();

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apps/blog/blog.js Normal file
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import * as commonmark from './commonmark.min.js';
function escape(text) {
return (text ?? '').replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;');
}
function escapeAttribute(text) {
return (text ?? '').replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;').replaceAll('"', '&quot;').replaceAll("'", '&#39;');
}
function markdown(md) {
let reader = new commonmark.Parser({safe: true});
let writer = new commonmark.HtmlRenderer();
let parsed = reader.parse(md || '');
let walker = parsed.walker();
let event, node;
while ((event = walker.next())) {
node = event.node;
if (event.entering) {
if (node.type == 'image') {
if (node.destination.startsWith('&')) {
node.destination = '/' + node.destination + '/view';
}
}
}
}
return writer.render(parsed);
}
export async function render_blog_post_html(blog_post) {
let blob = utf8Decode(await ssb.blobGet(blog_post.blog));
return `<!DOCTYPE html>
<html>
<body>
<div>
<div><a href="../ssb/#${escapeAttribute(blog_post.author)}">${escape(blog_post.name)}</a> ${escape(new Date(blog_post.timestamp).toString())}</div>
<div>${markdown(blob)}</div>
</div>
</body>
</html>
`;
}
function render_blog_post(blog_post) {
return `
<div>
<h2><a href="../ssb/#${escapeAttribute(blog_post.id)}">${escape(blog_post.title)}</a></h2>
<div><a href="../ssb/#${escapeAttribute(blog_post.author)}">${escape(blog_post.name)}</a> ${escape(new Date(blog_post.timestamp).toString())}</div>
<div>${markdown(blog_post.summary)}</div>
</div>
`;
}
export function render_html(blogs) {
return `<!DOCTYPE html>
<html>
<head>
<title>🪵Tilde Blog</title>
<link href="./atom" type="application/atom+xml" rel="alternate" title="🪵Tilde Blog"/>
<style>
html {
background-color: #ccc;
}
</style>
<base target="_blank">
</head>
<body>
<div style="display: flex; flex-direction: row; align-items: center; gap: 1em">
<h1>🪵Tilde Blog</h1>
<div style="font-size: xx-small; vertical-align: middle"><a href="/~cory/blog/atom">atom feed</a></div>
</div>
${blogs.map(blog_post => render_blog_post(blog_post)).join('\n')}
</body>
</html>`;
}
function render_blog_post_atom(blog_post) {
return `<entry>
<title>${escape(blog_post.title)}</title>
<link href="https://tildefriends.net/~cory/ssb/#${blog_post.id}" />
<id>${blog_post.id}</id>
<published>${escape(new Date(blog_post.timestamp).toString())}</published>
<summary>${escape(blog_post.summary)}</summary>
<author>
<name>${escape(blog_post.name)}</name>
<feed>${escape(blog_post.author)}</feed>
</author>
</entry>`;
}
export function render_atom(blogs) {
return `<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>🪵Tilde Blog</title>
<subtitle>A subtitle.</subtitle>
<link href="https://tildefriends.net/~cory/blog/atom" rel="self"/>
<link href="https://tildefriends.net/~cory/blog/"/>
<id>https://www.tildefriends.net/~cory/blog/</id>
<updated>${new Date().toString()}</updated>
${blogs.map(blog_post => render_blog_post_atom(blog_post)).join('\n')}
</feed>`;
}
export async function get_posts() {
let blogs = [];
await ssb.sqlAsync(`
WITH
blogs AS (
SELECT
messages.author,
messages.id,
json_extract(messages.content, '$.title') AS title,
json_extract(messages.content, '$.summary') AS summary,
json_extract(messages.content, '$.blog') AS blog,
messages.timestamp
FROM messages_fts('blog')
JOIN messages ON messages.rowid = messages_fts.rowid
WHERE json_extract(messages.content, '$.type') = 'blog'),
public AS (
SELECT author FROM (
SELECT
messages.author,
RANK() OVER (PARTITION BY messages.author ORDER BY messages.sequence DESC) AS author_rank,
json_extract(messages.content, '$.publicWebHosting') AS is_public
FROM messages_fts('about')
JOIN messages ON messages.rowid = messages_fts.rowid
WHERE json_extract(messages.content, '$.type') = 'about' AND is_public IS NOT NULL)
WHERE author_rank = 1 AND is_public),
names AS (
SELECT author, name FROM (
SELECT
messages.author,
RANK() OVER (PARTITION BY messages.author ORDER BY messages.sequence DESC) AS author_rank,
json_extract(messages.content, '$.name') AS name
FROM messages_fts('about')
JOIN messages ON messages.rowid = messages_fts.rowid
WHERE json_extract(messages.content, '$.type') = 'about' AND
json_extract(messages.content, '$.about') = messages.author AND
name IS NOT NULL)
WHERE author_rank = 1)
SELECT blogs.*, names.name FROM blogs
JOIN public ON public.author = blogs.author
LEFT OUTER JOIN names ON names.author = blogs.author
ORDER BY blogs.timestamp DESC LIMIT 20
`, [], function(row) {
blogs.push(row);
});
return blogs;
}

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apps/blog/handler.js Normal file
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import * as blog from './blog.js';
async function main() {
let blogs = await blog.get_posts();
for (let blog_post of blogs) {
let title = (blog_post.title || '').replaceAll(/\W/g, '_').toLowerCase();
if (request.path === title) {
respond({data: await blog.render_blog_post_html(blog_post), content_type: 'text/html; charset=utf-8'});
return;
}
}
if (request.path == 'atom') {
respond({data: blog.render_atom(blogs), content_type: 'application/atom+xml'});
} else {
respond({data: blog.render_html(blogs), content_type: 'text/html; charset=utf-8'});
}
}
main().catch(function(error) {
respond({data: `<!DOCTYPE html>
<pre style="color: #f00">${error.message}\n${error.stack}</pre>`, content_type: 'text/html'});
});

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