Simple Registration/Invite Codes

This was a quick project that has not been heavily tested by myself. Originally only shared as a gist, but moved here for better updates and feedback.

1. Assumes "Anyone can register" is checked on wp-admin/options-general.php
2. Create a code by creating a post at wp-admin/edit.php?post_type=invite_codes with the code in the title
3. When a user registers at wp-login.php?action=register, they must provide a valid code. Code validation is fully dependent on get_page_by_title, so there is some loose matching
4. When a code is succuessfully used, the code "post" will be marked as 'draft', and post meta will be added indicating who used it.
5. Disabling the wp_update_post section will allow codes to be reused until manually marked as 'draft'

CLI

wp sic generate [--count=<count>] [--chars=<chars>] [--length=<length>]

example:

$ wp sic generate --chars="abcdef12345" --length=4 --count=10
Created code 1a3c (ID: 27271)
Created code 2513 (ID: 27272)
Created code 2d13 (ID: 27273)
Created code d5bf (ID: 27274)
Created code f3a2 (ID: 27275)
Created code 1ad5 (ID: 27276)
Created code fcd5 (ID: 27277)
Created code 32bf (ID: 27278)
Created code e51f (ID: 27279)
Created code 21ed (ID: 27280)

See wp help sic generate for information on each option.

Creating codes from a premade list

Suppose you have a predetermined list of codes you'd like to import. I recommend using core WP-CLI commands to import them.

For example, here's my codes.txt file, which contains 3 codes (they must each be on their own line):

specialcode1
specialcode2
specialcode3

I can then use this loop with WP-CLI to read that file and create new create the invite code posts:

$ while IFS=, read -r code; do wp post create --post_type=invite_codes --post_title=$code --post_status=publish; done < codes.txt
Success: Created post 27217.
Success: Created post 27218.
Success: Created post 27219.

Note that this method does not take into consideration duplicate codes.