support inference endpoints

pkg/mutators/single/huggingface.go

@@ -61,7 +61,7 @@ type HuggingFaceRequest struct {
 
 func init() {
 	singleRegister("huggingface", huggingface,
-		withDescription("ask HuggingFace for simple tasks, optional arg is the model (needs a valid key in $HUGGING_FACE_HUB_TOKEN)"),
+		withDescription("ask HuggingFace for simple tasks, optional arg is the model (needs a valid key in $HUGGING_FACE_HUB_TOKEN, set HUGGING_FACE_ENDPOINT to use an Inference API endpoint)"),
 		withConfigBuilder(stdConfigStrings(0, 1)),
 		withAliases("hf"),
 		withCategory("external APIs"),
@@ -70,6 +70,7 @@ func init() {
 
 func huggingface(w io.WriteCloser, r io.ReadCloser, conf any) (int64, error) {
 	arg := conf.([]string)
+
 	baseURL := "https://api-inference.huggingface.co/models/"
 
 	token, source, err := getHuggingFaceToken()
@@ -86,8 +87,17 @@ func huggingface(w io.WriteCloser, r io.ReadCloser, conf any) (int64, error) {
 		model = m
 	}
 
+	url := baseURL + model
+	if os.Getenv("HUGGING_FACE_ENDPOINT") != "" {
+		url = os.Getenv("HUGGING_FACE_ENDPOINT")
+		if len(arg) >= 1 && arg[0] != "" {
+			log.Println("warning: HUGGING_FACE_ENDPOINT is set, ignoring model argument")
+		}
+	}
+
 	log.Debugln("token: from ", source)
 	log.Debugln("model: ", model)
+	log.Debugln("url: ", url)
 
 	input, err := io.ReadAll(r)
 	if err != nil {
@@ -100,7 +110,7 @@ func huggingface(w io.WriteCloser, r io.ReadCloser, conf any) (int64, error) {
 
 	log.Debugf("request: %s\n", request)
 
-	req, err := http.NewRequest(http.MethodPost, baseURL+model, bytes.NewReader(request))
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(request))
 	if err != nil {
 		return 0, err
 	}