|
- #!/usr/bin/env python3
-
- # The SHA1 UUID stuff in Ruby is actually more complicated. Everything's right until the `head -c32`, but then Ruby transforms it into an integer in a quite peculiar way: https://github.com/sporkmonger/uuidtools/blob/a10724236cefd922ee5cd3de7695fb6e5fd703f5/lib/uuidtools.rb#L480-L494
- # Ruby code: ArchiveBot lib/job.rb + https://github.com/sporkmonger/uuidtools/blob/a10724236cefd922ee5cd3de7695fb6e5fd703f5/lib/uuidtools.rb#L688-L691
- # Takes the SHA-1 hash of the namespace (as raw bytes) and the name, truncates it to 32 hex chars, creates a new UUID from it, transforms two fields, converts it to a bigint, and formats it in base-36
-
- # sed/sha1sum/head/bash-based version missing the time_hi_and_version and clock_seq_hi_and_reserved modification
- #{ echo -n '82244de1-c354-4c89-bf2b-f153ce23af43' | sed 's,-,,g' | xxd -r -p; echo -n 'https://transfer.notkiska.pw/sDu6C/marwilliamson-twitter.txt'; } | sha1sum | head -c32 | { read -r hash; BASE36=($(echo {0..9} {a..z})); for i in $(bc <<< "obase=32; ibase=16; ${hash^^}" | tr -d '\\\n'); do echo -n ${BASE36[$((10#$i))]}; done; }; echo
-
-
- import hashlib
- import sys
- import uuid
-
- url = sys.argv[1] # Assume that it's normalised already
-
- # Calculate hash
- h = hashlib.sha1()
- h.update(bytes.fromhex('82244de1-c354-4c89-bf2b-f153ce23af43'.replace('-', '')))
- h.update(url.encode('ascii'))
- h = h.hexdigest()
-
- # Create and transform UUID object
- u = uuid.UUID(h[:32])
- f = list(u.fields)
- f[2] &= 0x0FFF
- f[2] |= (5 << 12)
- f[3] &= 0x3F;
- f[3] |= 0x80;
-
- # Turn it into an int
- #i = (f[0] << 96) + (f[1] << 80) + (f[2] << 64) + (f[3] << 56) + (f[4] << 48) + f[5]
- i = uuid.UUID(fields = f).int
-
- # Convert to base-36
- def int_to_base36(num):
- # https://stackoverflow.com/a/31746873
- assert num >= 0
- digits = '0123456789abcdefghijklmnopqrstuvwxyz'
- res = ''
- while not res or num > 0:
- num, i = divmod(num, 36)
- res = digits[i] + res
- return res
- print(int_to_base36(i))
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