[feature] add paging support to rss feed endpoint, and support JSON / atom feed types (#4442)

originally based on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4396

hope this is okay https://codeberg.org/zordsdavini !

closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4411
closes https://codeberg.org/superseriousbusiness/gotosocial/issues/3407

Co-authored-by: Arnas Udovic <zordsdavini@gmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4442
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/internal/web/etag.go b/internal/web/etag.go
index fcd55603b..42a6083f0 100644
--- a/internal/web/etag.go
+++ b/internal/web/etag.go
@@ -27,6 +27,7 @@ import (
 	"code.superseriousbusiness.org/gotosocial/internal/log"
 
 	"codeberg.org/gruf/go-cache/v3"
+	"codeberg.org/gruf/go-fastcopy"
 )
 
 type withETagCache interface {
@@ -47,13 +48,19 @@ type eTagCacheEntry struct {
 	lastModified time.Time
 }
 
-// generateEtag generates a strong (byte-for-byte) etag using
-// the entirety of the provided reader.
-func generateEtag(r io.Reader) (string, error) {
-	// nolint:gosec
-	hash := sha1.New()
+// generateEtag generates a strong (byte-for-byte) etag
+// using the entirety of the provided reader.
+func generateETag(r io.Reader) (string, error) {
+	return generateETagFrom(func(w io.Writer) error {
+		_, err := fastcopy.Copy(w, r)
+		return err
+	})
+}
+
+func generateETagFrom(writeTo func(io.Writer) error) (string, error) {
+	hash := sha1.New() // nolint:gosec
 
-	if _, err := io.Copy(hash, r); err != nil {
+	if err := writeTo(hash); err != nil {
 		return "", err
 	}