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Fetching webmentions
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// Based on https://sebastiandedeyne.com/webmentions-on-a-static-site-with-github-actions/ | |
const https = require('https'); | |
const fs = require('fs'); | |
// This token is provided to you after signing up to webmention.io | |
const { WEBMENTIONS_IO_TOKEN } = process.env; | |
function fetchMentions() { | |
const url = `https://webmention.io/api/mentions.jf2?domain=janmonschke.com&token=${WEBMENTIONS_IO_TOKEN}&per-page=999`; | |
return new Promise((resolve, reject) => { | |
https | |
.get(url, (res) => { | |
let body = ''; | |
res.on('data', (chunk) => { | |
body += chunk; | |
}); | |
res.on('end', () => { | |
try { | |
resolve(JSON.parse(body)); | |
} catch (error) { | |
reject(error); | |
} | |
}); | |
}) | |
.on('error', (error) => { | |
reject(error); | |
}); | |
}).then((response) => { | |
if (!('children' in response)) { | |
throw new Error('Invalid webmention.io response.'); | |
} | |
return response.children; | |
}); | |
} | |
console.log('Syncing webmentions'); | |
fetchMentions().then((webmentions) => { | |
console.log(`Fetched ${webmentions.length} webmentions`); | |
webmentions.forEach((webmention) => { | |
const slug = new URL(webmention['wm-target']).pathname | |
.replace(/\/$/, '') | |
.replace(/^\//, '') | |
.replaceAll('/', '__'); | |
const filename = `${__dirname}/data/${slug}.json`; | |
// this is the first mention, create the source file | |
if (!fs.existsSync(filename)) { | |
console.log('Creating a new webmentions cache file for', filename); | |
fs.writeFileSync(filename, JSON.stringify([webmention], null, 2)); | |
return; | |
} | |
// there is already a source file for this target | |
// therefore we are parsing that file, adding the mention to the source | |
// and then we're writing that file to disk again | |
const entries = JSON.parse(fs.readFileSync(filename)); | |
const newEntries = entries | |
.filter((wm) => wm['wm-id'] !== webmention['wm-id']) | |
.concat([webmention]); | |
newEntries.sort((a, b) => a['wm-id'] - b['wm-id']); | |
fs.writeFileSync(filename, JSON.stringify(newEntries, null, 2)); | |
if (entries.length !== newEntries.length) { | |
console.log('Wrote new mention to disk for', filename); | |
} | |
}); | |
console.log('Done syncing webmentions'); | |
}); |
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