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documentation: Clarify base64url encoding and padding #2368

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Oct 15, 2024
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documentation: Clarify base64url encoding and padding #2368

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7 changes: 4 additions & 3 deletions README.markdown
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Expand Up @@ -6255,7 +6255,7 @@ ngx.encode_base64

**context:** *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*, balancer_by_lua*, ssl_certificate_by_lua*, ssl_session_fetch_by_lua*, ssl_session_store_by_lua*, ssl_client_hello_by_lua**

Encodes `str` to a base64 digest.
Encodes `str` to a base64 digest. For base64url encoding use [`base64.encode_base64url`](https://github.com/openresty/lua-resty-core/blob/master/lib/ngx/base64.md#encode_base64url).

Since the `0.9.16` release, an optional boolean-typed `no_padding` argument can be specified to control whether the base64 padding should be appended to the resulting digest (default to `false`, i.e., with padding enabled).

Expand All @@ -6268,8 +6268,9 @@ ngx.decode_base64

**context:** *set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*, balancer_by_lua*, ssl_certificate_by_lua*, ssl_session_fetch_by_lua*, ssl_session_store_by_lua*, ssl_client_hello_by_lua**

Decodes the `str` argument as a base64 digest to the raw form.
The `str` should be standard 'base64' encoding for RFC 3548 or RFC 4648, and will returns `nil` if is not well formed or any characters not in the base encoding alphabet.
Decodes the `str` argument as a base64 digest to the raw form. For base64url decoding use [`base64.decode_base64url`](https://github.com/openresty/lua-resty-core/blob/master/lib/ngx/base64.md#decode_base64url).

The `str` should be standard 'base64' encoding for RFC 3548 or RFC 4648, and will returns `nil` if is not well formed or any characters not in the base encoding alphabet. Padding may be omitted from the input.

[Back to TOC](#nginx-api-for-lua)

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