Add hacky option to split id into path segments in proxy

giphyproxy/main.go

@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"os"
 	"regexp"
+	"slices"
 	"time"
 
 	"go.mau.fi/util/exerrors"
@@ -34,6 +35,7 @@ type Config struct {
 	mediaproxy.BasicConfig  `yaml:",inline"`
 	mediaproxy.ServerConfig `yaml:",inline"`
 	Destination             string `yaml:"destination"`
+	SplitIdx                []int  `yaml:"split_idx"`
 }
 
 var configPath = flag.String("config", "config.yaml", "config file path")
@@ -41,6 +43,7 @@ var generateServerKey = flag.Bool("generate-key", false, "generate a new server
 
 var giphyIDRegex = regexp.MustCompile(`^[a-zA-Z0-9-_]+$`)
 var destination = "https://i.giphy.com/%s.webp"
+var splitIdx []int
 
 func main() {
 	flag.Parse()
@@ -54,6 +57,9 @@ func main() {
 		mp.KeyServer.Version.Name = "mautrix-go + maunium-stickerpicker giphy proxy"
 		if cfg.Destination != "" {
 			destination = cfg.Destination
+			splitIdx = cfg.SplitIdx
+			slices.Sort(splitIdx)
+			slices.Reverse(splitIdx)
 		}
 		exerrors.PanicIfNotNil(mp.Listen(cfg.ServerConfig))
 	}
@@ -70,6 +76,12 @@ func getMedia(_ context.Context, id string, _ map[string]string) (response media
 	if !giphyIDRegex.MatchString(id) {
 		return nil, mediaproxy.ErrInvalidMediaIDSyntax
 	}
+	for _, idx := range splitIdx {
+		if idx >= len(id) {
+			return nil, mediaproxy.ErrInvalidMediaIDSyntax
+		}
+		id = id[:idx] + "/" + id[idx:]
+	}
 	return &mediaproxy.GetMediaResponseURL{
 		URL: fmt.Sprintf(destination, id),
 	}, nil