feat(template): add multi page upload capability

internal/routes/upload.go

@@ -10,39 +10,53 @@ import (
 	"tomatentum.net/svg-templater/pkg/svg/actions"
 )
 
-func CreateSVG(writer http.ResponseWriter, r *http.Request) {
+func CreateSVG(w http.ResponseWriter, r *http.Request) {
 
-	contentType := r.Header.Get("Content-Type")
-	if contentType != "image/svg+xml" {
-		http.Error(writer, "Incorrect Content-Type. Needs image/svg+xml.", http.StatusUnsupportedMediaType)
+	if err := r.ParseMultipartForm(128000000); err != nil {
+		http.Error(w, "Couldn't parse form data.", http.StatusBadRequest)
 		return
 	}
 
-	readsvg, err := io.ReadAll(r.Body)
-	if err != nil {
-		http.Error(writer, err.Error(), http.StatusInternalServerError)
-		log.Println("Error while reading Body\n", err)
-		return
-	}
+	fileheaders := r.MultipartForm.File["files"]
 
-	if ok, err := validateSVG(readsvg); err != nil || !ok {
-		http.Error(writer, err.Error(), http.StatusUnsupportedMediaType)
-		log.Println("Wrong Media Type was uploaded\n", err)
-		return
+	files := make([][]byte, len(fileheaders))
+
+	for i, fileh := range fileheaders {
+		file, err := fileh.Open()
+
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		buf, err := io.ReadAll(file)
+
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		if ok, err := validateSVG(buf); err != nil || !ok {
+			http.Error(w, err.Error(), http.StatusUnsupportedMediaType)
+			log.Println("Wrong Media Type was uploaded\n", err)
+			return
+		}
+
+		files[i] = buf
 	}
 
 	name := r.URL.Query().Get("name")
 
-	data, err := actions.Create(readsvg, name)
+	data, err := actions.Create(files, name)
 
 	if err != nil {
-		http.Error(writer, err.Error(), http.StatusInternalServerError)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
 		log.Println("Failed creating SVG template\n", err)
 		return
 	}
 
-	writer.Header().Add("Content-Type", "application/json")
-	json.NewEncoder(writer).Encode(data)
+	w.Header().Add("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(data)
 }
 
 func validateSVG(svgbuf []byte) (bool, error) {