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+# Kaptĉapelo
+Kaptĉapelo is a simple [Kocaptcha](https://github.com/koto-bank/kocaptcha)-compatible CAPTCHA server, to keep out robots and people with dubious intent. Rather than auto-generated challenges like Kocaptcha, though, Kaptĉapelo lets you create shiny, pretty, _custom_ challenges.
+
+Since Kaptĉapelo is a kinda-sorta drop-in replacement for Kocaptcha, you can [use it as CAPTCHA](https://docs-develop.pleroma.social/backend/configuration/cheatsheet/#captcha) for your [Pleroma](https://pleroma.social) server.
+
+
+
+## Installation
+### Setup
+Kaptĉapelo requires the following:
+
+* A Common Lisp implementation. I’d recommend [Steel Bank Common Lisp](http://www.sbcl.org/), which is robust and available on many operating systems under the package-name `sbcl`.
+* [Quicklisp](https://quicklisp.org/), a “package-manager” for Common Lisp libraries.
+
+To install these, you can run the following commands (replacing `guix` with your package-manager of choice)…
+
+```
+$ guix install sbcl
+$ mkdir --parents ~/.local/lib/quicklisp/
+$ wget https://beta.quicklisp.org/quicklisp.lisp
+$ sbcl --load quicklisp.lisp
+```
+
+And then, in SBCL, run…
+
+```
+* (quicklisp-quickstart:install :path "~/.local/lib/quicklisp/")
+* (ql:add-to-init-file)
+* (quit)
+```
+
+Back in the shell, we can clone Kaptĉapelo…
+
+```
+$ cd ~/.local/lib/quicklisp/local-projects/
+$ git clone https://notabug.org/jadedctrl/kaptchapelo
+```
+
+
+### Execution
+In the sources, you can find a script (`run-kaptchapelo.lisp`), which can be used like so:
+
+```
+$ # First, let’s make it executable…
+$ chmod +x ~/.local/lib/quicklisp/local-projects/kaptchapelo/run-kaptchapelo.lisp
+$ # … now we can run it…
+$ ~/.local/lib/quicklisp/local-projects/kaptchapelo/run-kaptchapelo.lisp
+```
+
+Now, Kaptchapelo should be running and good to go; visit http://localhost:5001 and have a look!
+
+
+
+## Configuration
+### Web-server
+You’ll probably be running Kaptchapelo through a reverse proxy; here’s how you can add it to an existing server definition with [nginx](https://nginx.org/):
+
+```
+server {
+	[…]
+
+	location /new {
+		set $target http://localhost:5001;
+		proxy_buffering off;
+		proxy_pass http://localhost:5001;
+	}
+
+	location /captcha/ {
+		set $target http://localhost:5001;
+		proxy_buffering off;
+		proxy_pass http://localhost:5001;
+	}
+
+	[…]
+}
+```
+
+That is to say, you don’t need a dedicated subdomain!
+
+
+### Custom captchas
+Making custom captchas is easy! A challenge is simply a PNG file (question) and a TXT file (answer).
+… that’s it! Literally.
+
+Note that the PNG and TXT files should have the same name (bird.png and bird.txt, not bird2.png and bird1.txt), and that the TXT answer should consist of one line with _no_ newline.
+
+A peek through this repository’s example captchas (in `./captcha/`) should give you the idea.
+
+
+### Captcha directory
+It’s likely you’ll want to provide a custom directory in which to store your captchas; no problem! Just edit the aforementioned `run-kaptchapelo.lisp` script, which contains a line…
+
+```
+:captcha-directory #p"~/.local/lib/quicklisp/local-projects/kaptchapelo/captcha/"
+```
+
+… all you have to do is replace the path there with your own.
+In addition, you can also change the port and address by editing this script.
+
+
+
+## Misc. information
+Author: Jaidyn Ann @jadedctrl@jam.xwx.moe  
+License: GNU AGPLv3
diff --git a/run-kaptchapelo.lisp b/run-kaptchapelo.lisp
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+#!/usr/bin/env -S sbcl --script
+
+(load #p"~/.local/lib/quicklisp/setup.lisp")
+(ql:quickload :kaptchapelo)
+
+(kaptchapelo:start-server
+  ;; Change captcha-directory’s path to your captchas
+  :captcha-directory #p"~/.local/lib/quicklisp/local-projects/kaptchapelo/captcha/"
+  :address "0.0.0.0"
+  :port 5001)