Created
August 9, 2024 09:45
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Takes a number (like an id) and one-way encrypts to a slug (needs to be stored in database)
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| require 'digest' | |
| SLUG_DEFAULT = 4 | |
| SAFESTRING = "BDFGHJKLMNPQRTVWXYZbdfghjkmnpqrtvwxyz26789".freeze | |
| def encrypt_to_slug(number, size: SLUG_DEFAULT, alphabet: SAFESTRING) | |
| non_numeric_set = alphabet.gsub(/[0-9]/, '') # Characters without digits | |
| # Step 1: Hash the number (using SHA256) | |
| hash = Digest::SHA256.digest(number.to_s) | |
| # Step 2: Convert hash to an integer | |
| num = hash.unpack1("H*").to_i(16) | |
| # Step 3: Encode to a custom base string | |
| base = alphabet.length | |
| result = '' | |
| while num > 0 | |
| result = alphabet[num % base] + result | |
| num /= base | |
| end | |
| encoded = result.rjust(size, alphabet[0])[0,size] # Ensure it's the correct size | |
| # Step 4: Ensure the first character is non-numeric | |
| encoded[0] = non_numeric_set[num % non_numeric_set.length] unless non_numeric_set.include?(encoded[0]) | |
| encoded | |
| end | |
| # Example usage: Generate and format output into a Markdown table with 5 columns | |
| output = "| " # Start the first row of the Markdown table | |
| 1000.times do |i| | |
| encoded_string = encrypt_to_slug(i, size: 4, alphabet: SAFESTRING) | |
| output += "#{encoded_string} | " | |
| output += "\n| " if (i + 1) % 5 == 0 # Start a new row after every 5 items | |
| end | |
| # Output the result | |
| puts output.strip # Print the output, removing any trailing whitespace |
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