more refactoring into seperate handlers

backend/middleware/body.go

@@ -0,0 +1,29 @@
+package middleware
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+func WithValidatedPost[K any](
+	fn func(request K, w http.ResponseWriter, r *http.Request),
+) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		request := new(K)
+
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		err = json.Unmarshal(body, request)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		fn(*request, w, r)
+	}
+}

backend/middleware/util.go

@@ -0,0 +1,48 @@
+package middleware
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/charmbracelet/log"
+)
+
+func WriteJsonOrError[K any](logger *log.Logger, object K, w http.ResponseWriter) {
+	jsonObject, err := json.Marshal(object)
+	if err != nil {
+		logger.Warn("could not marshal json object", "err", err)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	w.Write(jsonObject)
+	w.WriteHeader(http.StatusOK)
+}
+
+type ErrorObject struct {
+	Error string `json:"error"`
+}
+
+func writeError(logger *log.Logger, error string, w http.ResponseWriter, code int) {
+	e := ErrorObject{
+		error,
+	}
+
+	jsonObject, err := json.Marshal(e)
+	if err != nil {
+		logger.Warn("could not marshal json object", "err", err)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	w.Write(jsonObject)
+	w.WriteHeader(code)
+}
+
+func WriteErrorBadRequest(logger *log.Logger, error string, w http.ResponseWriter) {
+	writeError(logger, error, w, http.StatusBadRequest)
+}
+
+func WriteErrorInternal(logger *log.Logger, error string, w http.ResponseWriter) {
+	writeError(logger, error, w, http.StatusInternalServerError)
+}