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README.md

Welcome to the beta of GetPost!

What? (is this?)

It's a spindly-legged spirit-child mashup of Imgur.com, gist.Github.com, http://sprunge.us, and darkhttpd.

It's stupid-simple simple file / note sharing, that's easy to use.

Instead of requiring users to setup a server of their own, GetPost allows HTML/JS-savvy individuals to setup and administer an extremely hackable (single-file!) service, hosted on Cloudflare, for free, for their communities.

  • Cloudflare has a record of punching Nazis.
  • Cloudflare already spends the electricity to run the servers this code runs on.
  • Cloudflare has a business model.
  • Cloudflare cares about security.

TL;DR

  • I like the Cloudflare. They do their best. They're US based, but this is mostly fine; so am I.

On the other hand...

  • Github backs ICE.
  • Imgur requires phone verification to use. And is probably creepy.
  • Github is literally Microsoft
  • http://sprunge.us can't be used by "your dad" and has a single-point-of-failure. And only does text.
  • Github backs ICE.

GetPost

GetPost is built on Cloudflare Workers, as a very thin layer on top of Cloudflare's KV store to allow easy sharing of arbitrary resources, such as memes, poems, love-notes, DLLs, PDFs, etc...

From Cloudflare:

Workers KV is a global, low-latency, key-value data store. It supports exceptionally high read volumes with low-latency, making it possible to build highly dynamic APIs and websites which respond as quickly as a cached static file would.

Neat.

Workers KV is generally good for use-cases where you need to write relatively infrequently, but read quickly and frequently. It is optimized for these high-read applications, only reaching its full performance when data is being frequently read. Very infrequently read values are stored centrally, while more popular values are maintained in all of our data centers around the world.

Perfect.

KV achieves this performance by being eventually-consistent. Changes may take up to 60 seconds to propagate. Workers KV isn’t ideal for situations where you need support for atomic operations or where values must be read and written in a single transaction.

Fine.

All values are encrypted at rest with 256-bit AES-GCM, and only decrypted by the process executing your Worker scripts or responding to your API requests.

Okay, I don't trust this too much, but that's cool.

Why? (do I care)

Hearkening back to... eras before Github Gists became ubiquitous, it was common for enterprising computer-y people to setup a small webserver, for sharing odds and ends with individuals online. This was nice, because it was trivial for to use (easy one-line SCP terminal commands, and your file is online!) - and relatively flexible, but - if maintaining webservers was easy, SecDevOps wouldn't be a real word.

Running a server off your home computer is doable. I do it. But - if you're not careful, you expose your real-world location to third parties. Petty losers, escalating online drama, can use your IP address, to knock your whole house offline. A blown breaker, or downed tree limb, can take your site offline. If you forget to apply important security updates, random viruses/bots/worms can take your site offline. Sure, renting a cheap server in a computer warehouse can alleviate some of these issues, but the cheapest computers are $/mo, and still require proper care and maitenance.

Depending upon your threat model, self-hosting services can be great. But for most people who use the internet, this is not an especialy viable option.

So, this service trades the ability to host on your own machine, for the ability to be deployed "for free" with only few mouse clicks, and a copy and paste.

This project trades the ability to self-host, for the ability to move fast, and stand on the shoulders of a relatively benign corporate giant. Theoretically - without having to trust them! You kinda have to trust your GetPost admin, but I'm working on that by adding transparent support for strong encryption, and ultimately, if you are worried about your admin snooping on you, run your own instance!

It's really easy.

How?

Sign up for a free cloudflare account and make a worker via https://workers.dev.

Free tier covers 1GB of globally backed up / distributed storage, 1000 uploads/day, and 100k reads/day.

After that, it's $5/mo, for "lots of requests." After 100k clicks/day, hopefully you can find $5 and level up your game.

Okay, so how do I actually use this??

The basic version deployed on https://getpost.bitsandpieces.io offers relatively few pieces of functionality.

The primary point of use is:

https://getpost.bitsandpieces.io/post

This page loads an incredibly simple bit of html with a single file select. It uploads it, and saves it - returning the share URL, the delete URL (don't visit until you want to delete!) - and the expiry time (1 year).

GetPost saved 3916 bytes!
share link: http://getpost.bitsandpieces.io/post?key=01EYMS1DTBYAHCJNXBB8A4VP93_6a88a2dce9edc704a7d5fbf5369a1281ba24519216a55394e81419302664bb3a

save link to delete: http://getpost.bitsandpieces.io/delete?key=01EYMS1DTBYAHNICETRYLOLOL4

expires in: 1 year

You can also use it from the command line!

SPX:~/getpost$ curl -X POST --data-binary @../arts/dying\ is\ fine.png 'https://getpost.bitsandpieces.io/post'
GetPost saved 74532 bytes!
share link: https://getpost.bitsandpieces.io/post?key=01EYMS5VKW07DKHKZ6W5JMVCMG_0dc5cfbf9e95fbd313d05c208b5d4077d7fb9a81b1091680210ba319b9fd8594

save link to delete: https://getpost.bitsandpieces.io/delete?key=0NOYPLZDONTWHYWOULDUJMVCMH

expires in: 1 year

Raw Mode

By default the content is loaded in an HTML context, and dynamically decoded and inserted when the page is rendered. This is the magic that lets you upload markdown, but share HTML.

If you see content errors, or want to embed GetPosted resources in other pages - add &raw=true (or even &raw) to the share URL. This will return a best-guess mimetype (byte inspection code needs work, but handles the common cases) and the raw bytes from the original upload.

What's the security model?

So there are three-ish "things" you have to trust, until I land my asymmetric encryption work.

Right now:

  • Trust Cloudflare to not lie or cheat.
  • Trust your GetPost admin not to lie or cheat.
  • Trust the computer you use it on not to lie.
  • Trust that the javascript markdown renderer, the one external dep I dynamically link, won't be bought out, I guess.

I'm gonna fill this section out, just, later.

We already have TLS in motion, AES-256 at rest. It's pretty OK, but I have backend access and can hypothetically edit your posts. Fixing this "soon".

Where's the code? What next?

Code is uh, nuts. IDK. It's basically OK. I hate javascript. I'm sorry.

It's in a Gist here:

https://gist.github.com/infra-gf/afa898c66c63d98e95653c487d8cb2c4

I'm copypastaing it from the Cloudflare web editor periodically. SMH.

What's next?

  • asymmetric crypto with tweetnacl, kinda was the point
  • operational transform editing - editing / versioning with binary diffs
  • pay someone to rebuild this in typescript, and rebuild it in ultra-minimal async python3
  • find some way of coming up wtih $5/mo not-out-of-my-pocket, to run this indefinitely, at scale, for my friends
  • twitter bot lol? signal integration?
  • bug reports, feature requests, halp - plz someone help.
  • more docs IG
Raw
autoinsert.py
"""Usage: autoinsert.py
Embeds resources in a worker.js file from the local directory.
Spiritual descendent of https://github.com/kevinmehall/inlinr/blob/master/inlinr.py
"""
import sys, re, glob, os.path
# this was setup for use with docopt-ng... but not much value
# from docopt import docopt
# ARGS = docopt(__doc__)
# ARGS = {"INPUT_JS": "worker.js"}
if not os.path.exists("worker.js"):
raise FileNotFoundError("Can't find worker.js in local directory.")
else:
print("found worker.js...")
input_file_name = "worker.js"
# variables contain full contents of javascript file
INPUT_JS = open(input_file_name, "rb").read()
print(f"worker.js is {len(INPUT_JS)} bytes unpacked")
OUTPUT_JS = open(input_file_name, "rb").read()
substitutions = {}
# find all AUTOINSERT tagged fragments using a regular expression matching string-interpolated javascript
for fragment in re.findall(b"\`AUTOINSERT\w+\`", INPUT_JS):
file_name = (
fragment.strip(b"`").replace(b"__", b".").replace(b"AUTOINSERT_", b"").lower()
)
print("loading:", file_name)
substitutions[fragment] = b"`" + open(file_name, "rb").read() + b"`"
"""
js import syntax:
import "module-name";
where module-name:
> The module to import from. This is often a relative or absolute path name to the .js file containing the module. Certain bundlers may permit or require the use of the extension; check your environment. Only single quoted Strings are allowed. Any ".min.js" or ".js" file matching will be inlined.
"""
for import_ in re.findall(b"import\ '\w+'", INPUT_JS):
file_fragment = (
import_.replace(b"import '", b"").replace(b".js", b"")[0:-1]
).decode("utf-8")
print("loading import:", file_fragment)
matches = glob.glob(f"./{file_fragment}*.js")
for match in matches:
if match:
print(match)
substitutions[import_] = open(match, "rb").read()
break
# iterate through all substitutions, applying them in turn
for phrase, substitution in substitutions.items():
print(type(substitution))
OUTPUT_JS = OUTPUT_JS.replace(phrase, substitution)
# write modified file as "worker.packed.js"
output_file_name = input_file_name.replace(".js", ".packed.js")
open(output_file_name, "wb").write(OUTPUT_JS)
print(f"wrote: {output_file_name} ({len(OUTPUT_JS)} bytes)")
Raw
getpost.css
/* cyrillic-ext */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKcg72j00.woff2) format('woff2');
unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKew72j00.woff2) format('woff2');
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* greek-ext */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKcw72j00.woff2) format('woff2');
unicode-range: U+1F00-1FFF;
}
/* greek */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKfA72j00.woff2) format('woff2');
unicode-range: U+0370-03FF;
}
/* latin-ext */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKcQ72j00.woff2) format('woff2');
unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Ubuntu';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/ubuntu/v15/4iCs6KVjbNBYlgoKfw72.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
body {
margin: 0 auto;
color: #444444;
line-height: 1;
max-width: 960px;
padding: 12px;
}
h1,
h2,
h3,
h4 {
color: #111111;
font-weight: 400;
}
h1,
h2,
h3,
h4,
h5,
p {
padding: 0;
}
h1 {
font-size: 48px;
}
h2 {
margin-top: 36px;
font-size: 36px;
margin-bottom: 8px;
}
h3 {
font-size: 24px;
}
h4 {
line-height: 23px;
font-size: 21px;
}
h4 time {
font-size: 18px;
margin-left: 100px;
float: right;
}
h5 {
font-size: 18px;
}
a:link {
color: #000000;
margin: 0;
padding: 0;
vertical-align: baseline;
}
a:visited {
color: #000000;
}
a:hover {
text-decoration: none;
color: #ff6600;
}
ul,
ol {
padding: 0;
margin: 0;
}
li {
line-height: 24px;
}
li ul,
li ul {
margin-left: 24px;
}
p,
ul,
ol {
font-size: 16px;
line-height: 24px;
max-width: 540px;
}
pre {
padding: 0px 24px;
max-width: 800px;
white-space: pre-wrap;
}
code {
font-family: Consolas, Monaco, Andale Mono, monospace;
line-height: 1.5;
font-size: 13px;
}
aside {
display: block;
float: right;
width: 390px;
}
blockquote {
border-left: .5em solid #eee;
padding: 0 2em;
margin-left: 0;
max-width: 476px;
}
blockquote cite {
font-size: 14px;
line-height: 20px;
color: #bfbfbf;
}
blockquote cite:before {
content: '—'
}
blockquote p {
color: #666;
max-width: 460px;
}
hr {
width: 840px;
margin: 0 auto 0 auto;
color: #999;
}
h1 {
font-family: Ubuntu;
font-size: 32px;
font-style: normal;
font-variant: normal;
font-weight: 700;
line-height: 32px;
}
h2 {
font-family: Ubuntu;
font-size: 28px;
font-style: normal;
font-variant: normal;
font-weight: 700;
line-height: 32px;
}
h3 {
font-family: Ubuntu;
font-size: 25px;
font-style: normal;
font-variant: normal;
font-weight: 700;
line-height: 32px;
}
p {
font-family: Ubuntu;
font-size: 20px;
font-style: normal;
font-variant: normal;
font-weight: 400;
line-height: 32px;
}
blockquote {
font-family: Ubuntu;
font-size: 25px;
font-style: normal;
font-variant: normal;
font-weight: 400;
line-height: 32px;
}
pre {
font-family: Ubuntu;
font-size: 16px;
font-style: normal;
font-variant: normal;
font-weight: 400;
line-height: 32px;
}
Raw
getpost.html
<html>
<head>
<!-- Primary Meta Tags -->
<title>GetPost: Content</title>
<meta name="title" content="${TITLE}">
<meta name="description" content="${description}">
<!-- Open Graph / Facebook -->
<meta property="og:url" content="${url.toString()}">
<meta property="og:title" content="${TITLE}">
<meta property="og:description" content="${description}">
<meta property="og:image" content="${image_url}">
<!-- Twitter -->
<meta property="twitter:card" content="summary_large_image">
<meta property="twitter:url" content="${url.toString()}">
<meta property="twitter:title" content="${TITLE}">
<meta property="twitter:description" content="${description}">
<meta property="twitter:image" content="${image_url}">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
</head>
<body>
<link rel="stylesheet" href="getpost.css">
<div id="content">
<img id="imgContent" src="${image_url}"></img>
</div>
<div id="markdownContent">${marked_content}</div>
<script>
var payload_type = "${type}";
</script>
<script>
var payload = "${encoded_payload}";
</script>
<script>
const ENCODING = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
${injector};
</script>
</body>
</html>
Raw
marked.min.js
/**
* marked - a markdown parser
* Copyright (c) 2011-2021, Christopher Jeffrey. (MIT Licensed)
* https://github.com/markedjs/marked
*/
!function(e,u){"object"==typeof exports&&"undefined"!=typeof module?module.exports=u():"function"==typeof define&&define.amd?define(u):(e="undefined"!=typeof globalThis?globalThis:e||self).marked=u()}(this,function(){"use strict";function r(e,u){for(var t=0;t<u.length;t++){var n=u[t];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}function i(e,u){(null==u||u>e.length)&&(u=e.length);for(var t=0,n=new Array(u);t<u;t++)n[t]=e[t];return n}function c(e,u){var t;if("undefined"!=typeof Symbol&&null!=e[Symbol.iterator])return(t=e[Symbol.iterator]()).next.bind(t);if(Array.isArray(e)||(t=function(e,u){if(e){if("string"==typeof e)return i(e,u);var t=Object.prototype.toString.call(e).slice(8,-1);return"Map"===(t="Object"===t&&e.constructor?e.constructor.name:t)||"Set"===t?Array.from(e):"Arguments"===t||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t)?i(e,u):void 0}}(e))||u&&e&&"number"==typeof e.length){t&&(e=t);var n=0;return function(){return n>=e.length?{done:!0}:{done:!1,value:e[n++]}}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function t(e){return D[e]}var e,u=(function(u){function e(){return{baseUrl:null,breaks:!1,gfm:!0,headerIds:!0,headerPrefix:"",highlight:null,langPrefix:"language-",mangle:!0,pedantic:!1,renderer:null,sanitize:!1,sanitizer:null,silent:!1,smartLists:!1,smartypants:!1,tokenizer:null,walkTokens:null,xhtml:!1}}u.exports={defaults:e(),getDefaults:e,changeDefaults:function(e){u.exports.defaults=e}}}(e={exports:{}}),e.exports),n=/[&<>"']/,s=/[&<>"']/g,l=/[<>"']|&(?!#?\w+;)/,a=/[<>"']|&(?!#?\w+;)/g,D={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"};var o=/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/gi;function h(e){return e.replace(o,function(e,u){return"colon"===(u=u.toLowerCase())?":":"#"===u.charAt(0)?"x"===u.charAt(1)?String.fromCharCode(parseInt(u.substring(2),16)):String.fromCharCode(+u.substring(1)):""})}var p=/(^|[^\[])\^/g;var g=/[^\w:]/g,f=/^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;var F={},A=/^[^:]+:\/*[^/]*$/,C=/^([^:]+:)[\s\S]*$/,d=/^([^:]+:\/*[^/]*)[\s\S]*$/;function E(e,u){F[" "+e]||(A.test(e)?F[" "+e]=e+"/":F[" "+e]=k(e,"/",!0));var t=-1===(e=F[" "+e]).indexOf(":");return"//"===u.substring(0,2)?t?u:e.replace(C,"$1")+u:"/"===u.charAt(0)?t?u:e.replace(d,"$1")+u:e+u}function k(e,u,t){var n=e.length;if(0===n)return"";for(var r=0;r<n;){var i=e.charAt(n-r-1);if(i!==u||t){if(i===u||!t)break;r++}else r++}return e.substr(0,n-r)}var m=function(e,u){if(u){if(n.test(e))return e.replace(s,t)}else if(l.test(e))return e.replace(a,t);return e},b=h,x=function(t,e){t=t.source||t,e=e||"";var n={replace:function(e,u){return u=(u=u.source||u).replace(p,"$1"),t=t.replace(e,u),n},getRegex:function(){return new RegExp(t,e)}};return n},B=function(e,u,t){if(e){var n;try{n=decodeURIComponent(h(t)).replace(g,"").toLowerCase()}catch(e){return null}if(0===n.indexOf("javascript:")||0===n.indexOf("vbscript:")||0===n.indexOf("data:"))return null}u&&!f.test(t)&&(t=E(u,t));try{t=encodeURI(t).replace(/%25/g,"%")}catch(e){return null}return t},w={exec:function(){}},v=function(e){for(var u,t,n=1;n<arguments.length;n++)for(t in u=arguments[n])Object.prototype.hasOwnProperty.call(u,t)&&(e[t]=u[t]);return e},y=function(e,u){var t=e.replace(/\|/g,function(e,u,t){for(var n=!1,r=u;0<=--r&&"\\"===t[r];)n=!n;return n?"|":" |"}).split(/ \|/),n=0;if(t.length>u)t.splice(u);else for(;t.length<u;)t.push("");for(;n<t.length;n++)t[n]=t[n].trim().replace(/\\\|/g,"|");return t},_=function(e,u){if(-1===e.indexOf(u[1]))return-1;for(var t=e.length,n=0,r=0;r<t;r++)if("\\"===e[r])r++;else if(e[r]===u[0])n++;else if(e[r]===u[1]&&--n<0)return r;return-1},z=function(e){e&&e.sanitize&&!e.silent&&console.warn("marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. 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t=u.header?"th":"td";return(u.align?"<"+t+' align="'+u.align+'">':"<"+t+">")+e+"</"+t+">\n"},u.strong=function(e){return"<strong>"+e+"</strong>"},u.em=function(e){return"<em>"+e+"</em>"},u.codespan=function(e){return"<code>"+e+"</code>"},u.br=function(){return this.options.xhtml?"<br/>":"<br>"},u.del=function(e){return"<del>"+e+"</del>"},u.link=function(e,u,t){if(null===(e=V(this.options.sanitize,this.options.baseUrl,e)))return t;e='<a href="'+H(e)+'"';return u&&(e+=' title="'+u+'"'),e+=">"+t+"</a>"},u.image=function(e,u,t){if(null===(e=V(this.options.sanitize,this.options.baseUrl,e)))return t;t='<img src="'+e+'" alt="'+t+'"';return u&&(t+=' title="'+u+'"'),t+=this.options.xhtml?"/>":">"},u.text=function(e){return e},e}(),K=function(){function e(){}var u=e.prototype;return u.strong=function(e){return e},u.em=function(e){return e},u.codespan=function(e){return e},u.del=function(e){return e},u.html=function(e){return e},u.text=function(e){return e},u.link=function(e,u,t){return""+t},u.image=function(e,u,t){return""+t},u.br=function(){return""},e}(),Q=function(){function e(){this.seen={}}var u=e.prototype;return u.serialize=function(e){return e.toLowerCase().trim().replace(/<[!\/a-z].*?>/gi,"").replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g,"").replace(/\s/g,"-")},u.getNextSafeSlug=function(e,u){var t=e,n=0;if(this.seen.hasOwnProperty(t))for(n=this.seen[e];t=e+"-"+ ++n,this.seen.hasOwnProperty(t););return u||(this.seen[e]=n,this.seen[t]=0),t},u.slug=function(e,u){void 0===u&&(u={});var t=this.serialize(e);return this.getNextSafeSlug(t,u.dryrun)},e}(),W=u.defaults,Y=b,ee=function(){function t(e){this.options=e||W,this.options.renderer=this.options.renderer||new J,this.renderer=this.options.renderer,this.renderer.options=this.options,this.textRenderer=new K,this.slugger=new Q}t.parse=function(e,u){return new t(u).parse(e)},t.parseInline=function(e,u){return new t(u).parseInline(e)};var e=t.prototype;return e.parse=function(e,u){void 0===u&&(u=!0);for(var t,n,r,i,s,l,a,D,o,c,h,p,g,f,F,A="",C=e.length,d=0;d<C;d++)switch((D=e[d]).type){case"space":continue;case"hr":A+=this.renderer.hr();continue;case"heading":A+=this.renderer.heading(this.parseInline(D.tokens),D.depth,Y(this.parseInline(D.tokens,this.textRenderer)),this.slugger);continue;case"code":A+=this.renderer.code(D.text,D.lang,D.escaped);continue;case"table":for(l=o="",r=D.header.length,t=0;t<r;t++)l+=this.renderer.tablecell(this.parseInline(D.tokens.header[t]),{header:!0,align:D.align[t]});for(o+=this.renderer.tablerow(l),a="",r=D.cells.length,t=0;t<r;t++){for(l="",i=(s=D.tokens.cells[t]).length,n=0;n<i;n++)l+=this.renderer.tablecell(this.parseInline(s[n]),{header:!1,align:D.align[n]});a+=this.renderer.tablerow(l)}A+=this.renderer.table(o,a);continue;case"blockquote":a=this.parse(D.tokens),A+=this.renderer.blockquote(a);continue;case"list":for(o=D.ordered,E=D.start,c=D.loose,r=D.items.length,a="",t=0;t<r;t++)g=(p=D.items[t]).checked,f=p.task,h="",p.task&&(F=this.renderer.checkbox(g),c?0<p.tokens.length&&"text"===p.tokens[0].type?(p.tokens[0].text=F+" 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t,n="",r=e.length,i=0;i<r;i++)switch((t=e[i]).type){case"escape":n+=u.text(t.text);break;case"html":n+=u.html(t.text);break;case"link":n+=u.link(t.href,t.title,this.parseInline(t.tokens,u));break;case"image":n+=u.image(t.href,t.title,t.text);break;case"strong":n+=u.strong(this.parseInline(t.tokens,u));break;case"em":n+=u.em(this.parseInline(t.tokens,u));break;case"codespan":n+=u.codespan(t.text);break;case"br":n+=u.br();break;case"del":n+=u.del(this.parseInline(t.tokens,u));break;case"text":n+=u.text(t.text);break;default:var s='Token with "'+t.type+'" type was not found.';if(this.options.silent)return void console.error(s);throw new Error(s)}return n},t}(),ue=v,te=z,ne=m,m=u.getDefaults,re=u.changeDefaults,u=u.defaults;function ie(e,t,n){if(null==e)throw new Error("marked(): input parameter is undefined or null");if("string"!=typeof e)throw new Error("marked(): input parameter is of type "+Object.prototype.toString.call(e)+", string expected");if("function"==typeof t&&(n=t,t=null),t=ue({},ie.defaults,t||{}),te(t),n){var r,i=t.highlight;try{r=X.lex(e,t)}catch(e){return n(e)}var s=function(u){var e;if(!u)try{e=ee.parse(r,t)}catch(e){u=e}return t.highlight=i,u?n(u):n(null,e)};if(!i||i.length<3)return s();if(delete t.highlight,!r.length)return s();var l=0;return ie.walkTokens(r,function(t){"code"===t.type&&(l++,setTimeout(function(){i(t.text,t.lang,function(e,u){return e?s(e):(null!=u&&u!==t.text&&(t.text=u,t.escaped=!0),void(0===--l&&s()))})},0))}),void(0===l&&s())}try{var u=X.lex(e,t);return t.walkTokens&&ie.walkTokens(u,t.walkTokens),ee.parse(u,t)}catch(e){if(e.message+="\nPlease report this to https://github.com/markedjs/marked.",t.silent)return"<p>An error occurred:</p><pre>"+ne(e.message+"",!0)+"</pre>";throw e}}return ie.options=ie.setOptions=function(e){return ue(ie.defaults,e),re(ie.defaults),ie},ie.getDefaults=m,ie.defaults=u,ie.use=function(l){var u,t=ue({},l);l.renderer&&function(){var e,s=ie.defaults.renderer||new J;for(e in l.renderer)!function(r){var i=s[r];s[r]=function(){for(var e=arguments.length,u=new Array(e),t=0;t<e;t++)u[t]=arguments[t];var n=l.renderer[r].apply(s,u);return n=!1===n?i.apply(s,u):n}}(e);t.renderer=s}(),l.tokenizer&&function(){var e,s=ie.defaults.tokenizer||new O;for(e in l.tokenizer)!function(r){var i=s[r];s[r]=function(){for(var e=arguments.length,u=new Array(e),t=0;t<e;t++)u[t]=arguments[t];var n=l.tokenizer[r].apply(s,u);return n=!1===n?i.apply(s,u):n}}(e);t.tokenizer=s}(),l.walkTokens&&(u=ie.defaults.walkTokens,t.walkTokens=function(e){l.walkTokens(e),u&&u(e)}),ie.setOptions(t)},ie.walkTokens=function(e,u){for(var t,n=c(e);!(t=n()).done;){var r=t.value;switch(u(r),r.type){case"table":for(var i=c(r.tokens.header);!(s=i()).done;){var s=s.value;ie.walkTokens(s,u)}for(var l,a=c(r.tokens.cells);!(l=a()).done;)for(var D=c(l.value);!(o=D()).done;){var 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Display the source blob
Display the rendered blob
Raw
notpacman.svg
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Raw
test.sh
#! /bin/bash
set -exu
# this was the first-draft pipeline
# echo "# this is a test\n## of backend rendering" | curl -s --data-binary @/dev/stdin https://getpost.latest.workers.dev | tee /dev/stderr | grep share\ link | awk '{print $4}' | sed -e 's/\&raw//g' | xargs curl -s | grep -v https
NO_ULID='s/01\([A-Z0-9]*\).*//'
STAGING_URL="https://getpost.latest.workers.dev"
function bare_sha256sum(){
sha256sum - | awk '{print $1}'
}
# post a very simple markdown document to staging and store the response
raw_response="$(echo -ne "# this is a test\n## of backend rendering\n\n" | curl -s --data-binary @/dev/stdin $STAGING_URL)"
# parse the store-response for the share key
formatted_share_link="$(echo $raw_response | sed -e 's/ /\n/g' | grep key | head -n 1 | sed -e 's/\&raw//g')"
# load the rendered HTML with curl, remove the URL lines contatining the new ULID, and hash everything else to ensure proper rendering
rendered_sha256=$(curl $formatted_share_link | sed $NO_ULID | bare_sha256sum)
# load the rendered page for upload.html, and hash it
upload_sha256=$(curl $STAGING_URL/post | sed $NO_ULID | bare_sha256sum)
# upload notpacman.png, load the share link, and hash it
image_embed_sha256=$(curl --data-binary @notpacman.png $STAGING_URL | grep share\ link | awk '{print $4}' | sed -e's/\&raw//g' | xargs curl | sed $NO_ULID | bare_sha256sum)
if [ "$rendered_sha256 $upload_sha256 $image_embed_sha256" == "77c098d3dbca6e6f086da27b4668988221400c9ba57119adbd9ae1f480e74e13 57d931186d1cb536b046d0af67d71ddd8a39fccc4b94922c303b39f13b70c327 bf782288885907fcbb05fe45a1608377b3c2ffb7219d08ff2acb1b7c06432d0f" ]
then echo "SUCCESS"
else
echo "FAIL"
exit -1
fi
Raw
upload.html
<html><head>
<link rel="stylesheet" href="/getpost.css">
<title>GetPost: Upload</title>
<meta name="title" content="GetPost: File Upload">
<meta name="description" content="Share the love!">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta property="twitter:card" content="summary_large_image">
<meta property="twitter:url" content="https://getpost.bitsandpieces.io/"">
<meta property="twitter:title" content="GetPost: Upload">
<meta property="twitter:description" content="Libre linking for poems and memes. Share the love!">
<meta property="twitter:image" content="https://getpost.bitsandpieces.io/post?key=01EYWFTY440WJFRAC6MX8VZ5YK&raw">
</head>
<body>
<div id="wrap">
<div id="form">
<form method="post" enctype="multipart/form-data" action="/post" method="post" >
<input id="upfile" name="upfile" type="file">
<input value="Post" onclick="upload_file_directly()" type="button">
</form>
</div>
</div>
<table id="userinfo"><tr>
<tr id="upfilename"></tr>
<tr id="upfilesize"></tr>
<tr id="upfiletype"></tr>
<tr>
<div id="notpacman" style="width: 30%; height: auto" >
${notpacman_svg}
</div>
</tr>
<tr><td id="message">omnomnom files.<br/></td></tr>
</table>
</div>
<script>
var file;
var file_buffer;
const dropArea = document.getElementById('notpacman');
dropArea.addEventListener('dragover', (event) => {
event.stopPropagation();
event.preventDefault();
// Style the drag-and-drop as a "copy file" operation.
event.dataTransfer.dropEffect = 'copy';
});
dropArea.addEventListener('drop', (event) => {
event.stopPropagation();
event.preventDefault();
file = event.dataTransfer.files[0];
file.arrayBuffer().then((l,r)=>{file_buffer=l})
document.getElementById("upfilesize").innerHTML = "Size: " + file.size + " bytes";
document.getElementById("upfiletype").innerHTML = "Type: " + file.type;
document.getElementById("upfilename").innerHTML = "Filename: " + file.name;
});
function upload_file_directly() {
var oReq = new XMLHttpRequest();
oReq.open("POST", "/post", true);
oReq.onload = function (oEvent) {
console.log(oReq.response);
document.body.innerHTML = oReq.response
};
oReq.overrideMimeType(document.getElementById("upfiletype").innerHTML);
var blob = new Blob([file_buffer], {type: 'application/x-www-form-urlencoded'});
oReq.send(blob);
};
document.getElementById("upfile").addEventListener("change", function(event) {
file = event.target.files[0];
file.arrayBuffer().then((l,r)=>{file_buffer=l})
document.getElementById("upfilesize").innerHTML = "Size: " + file.size + " bytes";
document.getElementById("upfiletype").innerHTML = "Type: " + file.type;
document.getElementById("upfilename").innerHTML = "Filename: " + file.name;
}, false);
</script>
</body>
</html>
Raw
worker.js
// Copyleft 2021: AKA Infra
// Formally: PUBLIC DOMAIN / CC0
// Informally: "an ye harm none, do what ye will"
import 'marked'
const ENCODING = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
const DEFAULT_MIME_TEXT = 'text/raw; charset=UTF-8'
const DEFAULT_MIME_HTML = 'text/html; charset=UTF-8'
const favicon_gzip = 'H4sIAO9PM2AAA+2UMQrCQBBF36wbNZUBiUKa2MXOI9il9Rh6DMHKyjOls/UKVpYqFimEOBpE4yYXkLzls7Pzh+FXC6InCHix8mCk91T1bE1UQr80hQ9fdZIk+L6PMQZrLWmaIiJEUUQYhrS0tPwx3crLOIXj9vCaJ5o3//Y6VUNwqVvg5nl/cA2JbZ1bbs7ncFrCfgNbDbArVGdY5DBTxTfVFQYXKFTrA2RDOI7hHsMDH7d8sX4FAAA='
// this is non-standard, but very convenient and relatively simple
// interpolated strings - those wrapped in single-backticks (`) - and prefaced with AUTOINSERT
// are found by a regular-expression search autoinsert.py and converted into corresponding filenames
// ie, AUTOINSERT_NOTPACMAN__SVG is replaced with the contents of notpacman.svg, in the local directory
// this keeps the worker.js script long, without requiring much build tooling
//
const notpacman_svg = `AUTOINSERT_NOTPACMAN__SVG` // eslint-disable-line
const getpost_css = `AUTOINSERT_GETPOST__CSS` // eslint-disable-line
const upload = `AUTOINSERT_UPLOAD__HTML` // eslint-disable-line
const ENCODING_LEN = ENCODING.length
const TIME_LEN = 10
const RANDOM_LEN = 16
// returns a single byte from the Cloudflare worker's (cryptographically secure) RNG
function prng () {
const buffer = new Uint8Array(8)
crypto.getRandomValues(buffer)
return buffer[0] / 0xff
};
// get a random character from the set of encodings
function randomChar () {
let rand = Math.floor(prng() * ENCODING_LEN)
if (rand === ENCODING_LEN) {
rand = ENCODING_LEN - 1
}
return ENCODING.charAt(rand)
}
// shove time (or any integer) into "len" base32 characters
function encodeTime (now, len) {
let mod
let str = ''
for (; len > 0; len--) {
mod = now % ENCODING_LEN
str = ENCODING.charAt(mod) + str
now = (now - mod) / ENCODING_LEN
}
return str
}
// get "len" random base32 characters
function encodeRandom (len) {
let str = ''
for (; len > 0; len--) {
str = randomChar() + str
}
return str
}
// return a ULID from an optional time, comprised of TIME_LEN characters of timestamp and RANDOM_LEN characters of entropy
function ulid (seedTime) {
if (isNaN(seedTime)) {
seedTime = Date.now()
}
return encodeTime(seedTime, TIME_LEN) + encodeRandom(RANDOM_LEN)
};
// helper to turn a string into an array buffer
function str2ab (str) {
const buf = new ArrayBuffer(str.length)
const bufView = new Uint8Array(buf)
for (let i = 0, strLen = str.length; i < strLen; i++) {
bufView[i] = str.charCodeAt(i) & 0xFF
}
return buf
}
// Uint8Array -> hex string
function hex (uint8arr_or_arraybuffer) {
const uint8arr = new Uint8Array(uint8arr_or_arraybuffer)
if (!uint8arr) {
return ''
}
let hexStr = ''
for (let i = 0; i < uint8arr.length; i++) {
let hex = (uint8arr[i] & 0xff).toString(16)
hex = (hex.length === 1) ? '0' + hex : hex
hexStr += hex
}
return hexStr
}
// content (and optional url) to wrapper html and detected type
function wrap_content (content, url = '') {
if ((content === null) || (content === undefined)) {
return ['CONTENT NOT FOUND', DEFAULT_MIME_TEXT]
}
const uint8_array = new Uint8Array(content)
const content_string = new TextDecoder('utf-8').decode(uint8_array)
const is_printable = /^[\x20-\x7F]*$/.test(content_string)
const header = hex(uint8_array.slice(0, 4))
let injector, type
switch (header) {
case '25504446':
type = 'application/pdf'
break
case '89504e47':
type = 'image/png'
break
case '47494638':
type = 'image/gif'
break
case 'ffd8ffe0':
case 'ffd8ffe1':
case 'ffd8ffe2':
case 'ffd8ffe3':
case 'ffd8ffe8':
type = 'image/jpeg'
break
default:
type = DEFAULT_MIME_TEXT
break
}
switch (type) {
case 'image/png':
case 'image/gif':
case 'image/jpeg':
break
case 'application/pdf':
injector = 'window.location.assign(window.location.href+\'&raw\')'
break
case DEFAULT_MIME_TEXT:
default:
// no injector used by default, as "marked()" is invoked worker-side to generate HTML
injector = ''
break
}
const TITLE = `GetPost: ${type}`
let marked_content = ''
const encoded_payload = ''
let image_url = ''
let description = ''
// strip non-url characters from description
if (type === DEFAULT_MIME_TEXT) {
marked_content = marked((new TextDecoder('utf-8')).decode(content))
// first 140 characters that aren't special
description = (new TextDecoder('utf-8')).decode(new Uint8Array(content.slice(0, 140))).replace(/[^0-9a-z\\\ \.\:\?]/gi, '')
} else {
description = 'GetPost: ' + type
}
if (type.startsWith('image/')) {
image_url = url.toString() + '&raw'
injector = ''
};
const wrapped_html = `AUTOINSERT_GETPOST__HTML` // eslint-disable-line
return [wrapped_html, type]
}
function response_with_blob (blob, type = DEFAULT_MIME_HTML, headers = {}, statuscode = 200) {
const headers_with_type = Object.assign(headers, { 'content-type': type })
if (statuscode !== 200) {
return new Response(blob, { status: statuscode, statusText: blob })
}
return new Response(blob, { status: statuscode, headers: headers_with_type })
}
addEventListener('fetch', fetch_event => {
// configure primary entrypoint
fetch_event.respondWith(HANDLER(fetch_event))
})
// main entrypoint for all requests
async function HANDLER (fetch_event) {
const now = Date.now()
request = fetch_event.request
// massage headers and cloudflare metadata into "header_obj" - an object containing helpful metadata for a given request
let headers = [...request.headers]
for (const key in request.cf) {
headers = headers.concat([
['cf-' + key, request.cf[key]]
])
}
const header_obj = {}
for (const header_index in headers) {
header_obj[headers[header_index][0].toLowerCase()] = headers[header_index][1]
}
const url = new URL(request.url)
// wrap main handler in a try/catch exception logging & reporting block, for easy debug
try {
url.protocol = 'https:'
// if upload is directed at /post or root (new)
if ((url.pathname === '/post') || (url.pathname === '/')) {
if (request.method === 'POST') {
// generate store, edit, and delete keys - for future reference
const store_key = ulid(now)
const edit_key = ulid(now)
const delete_key = ulid(now)
let blob = await request.arrayBuffer()
blob = await (new Blob([blob])).arrayBuffer()
// use specified ttl if x-ttl header present, else use 1 year
let x_ttl_seconds = header_obj['x-ttl']
if (x_ttl_seconds === undefined) {
// 1 year: 24 hours/day, 60*60 seconds/hour, 30 days/month, 12months/year
x_ttl_seconds = 24 * 60 * 60 * 30 * 12
} else {
// parse base-10 number from header string
x_ttl_seconds = parseInt(x_ttl_seconds, 10)
}
await NAMESPACE.put(store_key, blob, { expirationTtl: x_ttl_seconds, metadata: { edit: edit_key, del: delete_key } })
// date string for expiry in IS08601; have to multiply TTL (in seconds) by 1000 for JS-friendly time
const expires_at = new Date(x_ttl_seconds * 1000 + now).toISOString()
const resp = `## GetPost stored ${blob.byteLength} bytes!
## share link: ${url.href}?key=${store_key}&raw
## save link to delete: ${url.href}?key=${store_key}&del=${delete_key}
## expires at: ${expires_at}`
// file body is just bytes from the file, type and name are optionally passed as parameters
if (header_obj['content-type'] === 'application/x-www-form-urlencoded') {
if (header_obj['user-agent'].startsWith('curl/')) {
return response_with_blob(resp, DEFAULT_MIME_TEXT)
} else {
return response_with_blob(marked(resp), DEFAULT_MIME_TEXT)
}
}
// normal multipart form uploads are actually surprisingly messy to parse, with their own syntax and semantics
// instead of using normal form submit (multipart) - upload.html actually intercepts the buttonpush and calls a special handler to upload
// NB: should never get here
return response_with_blob('Sorry, MultiPart uploads are not supported.', DEFAULT_MIME_HTML, {}, 503)
} else if (request.method === 'GET') {
const del = url.searchParams.get('del')
const key = url.searchParams.get('key')
const raw = url.searchParams.has('raw')
// if no key parameter provided, return the upload prompt so user can upload
if (!url.searchParams.has('key')) {
return response_with_blob(upload)
}
// ULID is len26
if (key.length === 26 || key.length === 91) {
let { key_as_arrayBuffer, metadata } = await NAMESPACE.getWithMetadata(key, 'arrayBuffer')
// if either key dne, or old format
if (metadata === null) {
// check to see if old (pre-metadata)
key_as_arrayBuffer = await NAMESPACE.get(key, 'arrayBuffer')
if (key_as_arrayBuffer !== null) {
key_as_arrayBuffer = key_as_arrayBuffer.slice(0, -26)
} else {
return response_with_blob('Sorry, invalid key!', DEFAULT_MIME_TEXT, {}, 404)
}
} else {
// this second get should not be required... it appears getWithMetadata doesn't support returning arrayBuffers!?
key_as_arrayBuffer = await NAMESPACE.get(key, 'arrayBuffer')
}
// if both key and delete key...
if (url.searchParams.has('del') && (del.length == 26)) {
if (del === metadata.del) {
const deleted_target_key = await NAMESPACE.delete(key)
return response_with_blob(`OK, sent command to delete ${key} using ${del} - please wait 3min for full delete.`)
} else {
return response_with_blob('Sorry, invalid del key!', DEFAULT_MIME_TEXT, {}, 404)
}
}
const [gen_body_html, type] = wrap_content(key_as_arrayBuffer, url)
if (raw) {
// if requested as raw, return the original resp object wtih detected MIME type
return response_with_blob(key_as_arrayBuffer, type)
}
// otherwise, return the wrapped body with the text/html mimetype
else {
return response_with_blob(gen_body_html, DEFAULT_MIME_HTML)
}
} else {
return response_with_blob('Sorry, invalid key!', DEFAULT_MIME_TEXT, {}, 404)
}
}
} else if (url.pathname === '/headers') {
header_obj.url = url.toString()
header_obj.method = request.method
return new Response(JSON.stringify(header_obj) + '\n')
} else if (url.pathname === '/echo') {
return new response_with_blob(await request.arrayBuffer())
} else if (url.pathname === '/raise_exception') {
this_method_does_not_exist()
} else if (url.pathname === '/getpost.css') {
return response_with_blob(getpost_css, 'text/css')
} else if (url.pathname === '/favicon.ico') {
// returning binary requires UTF-16 JS strings to be converted to ie) UTF-8 bytes
return response_with_blob(str2ab(atob(favicon_gzip)), 'image/x-icon', { 'Content-Encoding': 'gzip' })
} else {
return response_with_blob(`You probably want ${url.host}/post, not ${url.pathname}!`, DEFAULT_MIME_HTML, {}, 404)
}
} catch (err) {
header_obj.url = url.toString()
header_obj.method = request.method
header_obj.traceback = err.stack.split('\n')
// include the first 20 bytes, as 40 hex characters
header_obj.startBodyHex = hex((await request.arrayBuffer()).slice(0, 20))
return new Response(JSON.stringify(header_obj, null, 2), {
status: 500,
statusText: 'caught exception in worker'
})
}
}
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