tildefriends/apps/blog/blog.js

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import * as commonmark from './commonmark.min.js';
function escape(text) {
return (text ?? '')
.replaceAll('&', '&')
.replaceAll('<', '&lt;')
.replaceAll('>', '&gt;');
}
function escapeAttribute(text) {
return (text ?? '')
.replaceAll('&', '&amp;')
.replaceAll('<', '&lt;')
.replaceAll('>', '&gt;')
.replaceAll('"', '&quot;')
.replaceAll("'", '&#39;');
}
export async function get_blog_message(id) {
let message;
await ssb.sqlAsync(
'SELECT author, timestamp, content FROM messages WHERE id = ?',
[id],
function (row) {
let content = JSON.parse(row.content);
message = {
author: row.author,
timestamp: row.timestamp,
blog: content?.blog,
title: content?.title,
};
}
);
if (message) {
await ssb.sqlAsync(
`
SELECT json_extract(content, '$.name') AS name
FROM messages
WHERE author = ?
AND json_extract(content, '$.type') = 'about'
AND json_extract(content, '$.about') = author
AND name IS NOT NULL
ORDER BY sequence DESC LIMIT 1
`,
[message.author],
function (row) {
message.name = row.name;
}
);
}
return message;
}
export 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.destination?.startsWith('&')) {
node.destination =
'/' + node.destination + '/view?filename=' + node.firstChild?.literal;
} else if (
node.destination?.startsWith('@') ||
node.destination?.startsWith('%')
) {
node.destination = '/~core/ssb/#' + escape(node.destination);
}
}
}
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>
<head>
<title>🪵Tilde Friends Blog - ${markdown(blog_post.title)}</title>
<base target="_top">
</head>
<body>
<h1><a href="./">🪵Tilde Friends Blog</a></h1>
<div>
<div><a href="../ssb/#${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="/~${core.app.owner}/${core.app.name}/${escapeAttribute(blog_post.id)}">${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 Friends Blog</title>
<link href="./atom" type="application/atom+xml" rel="alternate" title="🪵Tilde Blog"/>
<style>
html {
background-color: #ccc;
}
</style>
<base target="_top">
</head>
<body>
<div style="display: flex; flex-direction: row; align-items: center; gap: 1em">
<h1>🪵Tilde Friends 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="/~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="${core.url}/atom" rel="self"/>
<link href="${core.url}"/>
<id>${core.url}</id>
<updated>${new Date().toString()}</updated>
${blogs.map((blog_post) => render_blog_post_atom(blog_post)).join('\n')}
</feed>`;
}
export async function get_posts() {
let blogs = [];
let ids = await ssb.getIdentities();
await ssb.sqlAsync(
`
WITH
blogs AS (
SELECT
messages.author,
messages.id,
json_extract(messages.content, '$.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 json_each(?) AS self ON self.value = blogs.author
JOIN public ON public.author = blogs.author
LEFT OUTER JOIN names ON names.author = blogs.author
ORDER BY blogs.timestamp DESC LIMIT 20
`,
[JSON.stringify(ids)],
function (row) {
blogs.push(row);
}
);
return blogs;
}