chore: import upstream snapshot with attribution

src/webserver/database/sqlpage_functions/functions/request_body_base64.rs

@@ -0,0 +1,15 @@
+use crate::webserver::http_request_info::RequestInfo;
+
+/// Returns the raw request body encoded in base64.
+/// Returns NULL if there is no request body or if the request content type is
+/// application/x-www-form-urlencoded or multipart/form-data (in this case, the body is accessible via the `post_variables` field).
+pub(super) async fn request_body_base64(request: &RequestInfo) -> Option<String> {
+    let raw_body = request.raw_body.as_ref()?;
+    let mut base64_string = String::with_capacity((raw_body.len() * 4).div_ceil(3));
+    base64::Engine::encode_string(
+        &base64::engine::general_purpose::STANDARD,
+        raw_body,
+        &mut base64_string,
+    );
+    Some(base64_string)
+}