url shortener service

xyz.md

idea

• hash url's by sha512-256
• digest that sha512-256 hash into base62 (a-zA-Z0-9)
• truncate the base62 hash into first 3 characters and use it as key
• if record already exists for those first 3 characters, use 4 characters
• its generally a hash table backed by sha512-256 with base62 characters
• we use base62 because its more readable than hex

references

• https://blog.codinghorror.com/url-shortening-hashes-in-practice/
• https://github.com/dreamcreated/buffer-base62