urlsafe base64

base64_urlsafe.nim

import strutils
from base64 import nil

proc encodeUrlSafe(s: string): string =
  result = base64.encode(s, newLine="")
  while result.endsWith("="):
    result = result.substr(0, result.high-1)
  result = result.replace('+', '-').replace('/', '_')

proc decodeUrlSafe(s: string): string =
  var s = s
  while s.len mod 4 > 0:
    s &= "="
  base64.decode(s).replace('+', '-').replace('/', '_')