Re: encode/decode support for base64url - Mailing list pgsql-hackers

On 7 Mar 2025, at 4:40 PM, Aleksander Alekseev <aleksander@timescale.com> wrote:

Hi,

Sometimes support for base64url from RFC 4648 would be useful.
Does anyone else need a patch like this?

While not a frequent ask, it has been mentioned in the past.  I think it would
make sense to add so please do submit a patch for it for consideration.

IMO it would be nice to have.

Would you like to submit such a patch or are you merely suggesting an
idea for others to implement?

--
Best regards,
Aleksander Alekseev

Just to confirm: 

In a plan SQL flavor, we’re talking about something like this, correct?

CREATE FUNCTION base64url_encode(input bytea) RETURNS text AS $$

SELECT regexp_replace(

    replace(replace(encode(input, 'base64'), '+', '-'), '/', '_'),

    '=+$', '', 'g'

);

$$ LANGUAGE sql IMMUTABLE;

CREATE FUNCTION base64url_decode(input text) RETURNS bytea AS $$

SELECT decode(

    rpad(replace(replace(input, '-', '+'), '_', '/'), (length(input) + 3) & ~3, '='),

    'base64'

);

$$ LANGUAGE sql IMMUTABLE;

With minimal testing, this yields the same results with https://base64.guru/standards/base64url/encode

select base64url_encode('post+gres')

 base64url_encode 

------------------

 cG9zdCtncmVz

(1 row)