base64/2

Description

base64/2 is a predicate that unifies a string to a base64/2 encoded string.

The output is returned as an atom with padding included.

The signature is as follows:

base64(+Plain, -Encoded) is det
base64(-Plain, +Encoded) is det

Where:

• Plain is an atom, a list of characters, or character codes representing the unencoded text.
• Encoded is an atom, a list of characters, or character codes representing the base64/2 encoded form.

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

Examples

Encode and decode a string into a Base64 encoded atom

This scenario demonstrates how to encode an decode a plain string into a Base64-encoded atom using the base64/2 predicate.

Here are the steps of the scenario:

• Given the query:

base64('Hello world', Encoded),
base64(Decoded, 'SGVsbG8gd29ybGQ=').

• When the query is run
• Then the answer we get is:

height: 42
gas_used: 3976
answer:
  has_more: false
  variables: ["Encoded", "Decoded"]
  results:
  - substitutions:
    - variable: Encoded
      expression: "'SGVsbG8gd29ybGQ='"
    - variable: Decoded
      expression: "'Hello world'"