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base64url/2

Module​

This predicate is provided by base64.pl.

Load this module before using the predicate:

:- consult('/v1/lib/base64.pl').

Description​

base64url(-Plain, +Encoded) is det.

Relates a text value to its URL-safe Base64 representation.

The predicate is equivalent to base64_encoded/3 with options [as(atom), encoding(utf8), charset(url), padding(false)].

Signature​

base64url(+Plain, -Encoded) is det

Examples​

Encode and decode a string into a Base64 encoded atom in URL-Safe mode​

This scenario demonstrates how to encode an decode a plain string into a Base64-encoded atom using the base64url/2 predicate.

Here are the steps of the scenario:

  • Given the query:
consult('/v1/lib/base64.pl'),
base64url('<<???>>', Encoded),
base64url(Decoded, 'PDw_Pz8-Pg').
  • When the query is run
  • Then the answer we get is:
height: 42
gas_used: 18554
answer:
  has_more: false
  variables: ["Encoded", "Decoded"]
  results:
  - substitutions:
    - variable: Encoded
      expression: "'PDw_Pz8-Pg'"
    - variable: Decoded
      expression: "<<???>>"
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