jed

/*

This script runs a Deno server that serves an html page that
uses the the Origin Private File System API to determine which
mime type a browser infers based on file extension. It uses
the mime-db database to enumerate all candidate extensions.

For background, see https://mastodon.social/@jed/110533898437100502

1. Run deno run -A --watch mimedb.js

jed

Making your Mastodon account discoverable from your own domain, using Cloudflare page rules

Are you (1) moving to Mastodon, but (2) want to use your own Cloudflare-hosted domain for discoverability, and (3) don't want the hassle of managing your own instance?

Well, here's a quick way to make sure that folks can find you when they search Mastodon with your domain. The UX is like this:

(If you're not on Cloudflare or would rather just host a file, use Maarten Balliauw's post, How to discover Mastodon account via custom domain, from which this technique was inspired.)

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// this script replaces all t.co links in the data/tweets.js file of an unzipped twitter archive with their resolved urls.
// it replaces all text inline, so be sure to make a backup of the file before running.
// usage: deno run -A resolve_tco.js {path to data/tweets.js}

let file = Deno.args[0]
let text = await Deno.readTextFile(file)
let matches = text.match(/"https:\/\/t\.co\/\w+"/g)
let unique = [...new Set(matches)]
console.log('%s urls found.', unique.length)
if (unique.length) for (let match of matches) {

jed

// per https://twitter.com/yoshuawuyts/status/1494119486429007879
// "In JavaScript, is there a function which takes N Promises, and returns an asyncIterator which yields N resolved values?"

let promises = Array.from({length: 10}, (n, i) => {
  return new Promise(cb => setTimeout(cb, Math.random() * 1e3, i))
})

let iterator = iteratePromises(promises)
for await (let value of iterator) console.log(value)

jed

export default (build, namespace = 'view-source') => ({
  name: namespace,
  setup({initialOptions, onLoad, onResolve}) {
    let options = {...initialOptions, write: false}
    let filter = new RegExp(`^${namespace}:`)

    onResolve({filter}, ({path, importer}) => {
      path = path.replace(filter, '')
      try { importer = new URL(importer) }
      catch (e) { importer = new URL(`${namespace}://${importer}`) }

jed

function tee(asyncIterable) {
  let source = asyncIterable[Symbol.asyncIterator]()

  return [[], []].map((buffer, i, buffers) => ({
    async next() {
      if (0 in buffer) return buffer.shift()

      let item = await source.next()

      if (!item.done) buffers[1 - i].push(item)

jed

// Example usage:
//
// void async function() {
//   let [clicks, onclick] = iterator()
//   document.querySelector('button').addEventListener('click', onclick)
//   for await (let click of clicks) console.log(click)
// }()

export default function iterator() {
  let done = false

jed

const {createReadStream} = require('fs')
const {createHash} = require('crypto')

module.exports = (path, chunkSize = 5242880) => {
  return new Promise((resolve, reject) => {
    const hashes = []
    const options = {highWaterMark: chunkSize}
    const rs = createReadStream(path, options)

    rs.on('error', reject)

jed

#!/bin/sh

aws cloudformation deploy \
  --template-file stack.yaml \
  --stack-name edge-lambda-test \
  --capabilities CAPABILITY_IAM \
  --parameter-overrides Nonce=$RANDOM

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AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Resources:
  GetFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: nodejs6.10
      CodeUri: index.js
      Events: