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pgsql: Add support for base64url encoding and decoding

Daniel Gustafsson <dgustafsson@postgresql.org>

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From: Daniel Gustafsson <dgustafsson@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Date: 2025-09-20T21:24:31Z
Lists: pgsql-hackers 
Add support for base64url encoding and decoding

This adds support for base64url encoding and decoding, a base64
variant which is safe to use in filenames and URLs.  base64url
replaces '+' in the base64 alphabet with '-' and '/' with '_',
thus making it safe for URL addresses and file systems.

Support for base64url was originally suggested by Przemysław Sztoch.

Author: Florents Tselai <florents.tselai@gmail.com>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: David E. Wheeler <david@justatheory.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Chao Li (Evan) <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/70f2b6a8-486a-4fdb-a951-84cef35e22ab@sztoch.pl

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e1d917182c1953b16b32a39ed2fe38e3d0823047

Modified Files
--------------
doc/src/sgml/func/func-binarystring.sgml |  19 ++++
src/backend/utils/adt/encode.c           | 157 ++++++++++++++++++++++++++-----
src/test/regress/expected/strings.out    | 150 +++++++++++++++++++++++++++++
src/test/regress/sql/strings.sql         |  54 +++++++++++
4 files changed, 359 insertions(+), 21 deletions(-)

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add support for base64url encoding and decoding