Write logic for createElection validation

cmd/web/helpers.go

@@ -1,12 +1,63 @@
 package main
 
-import "net/http"
+import (
+	api "code.dlmw.ch/dlmw/qv/internal"
+	"code.dlmw.ch/dlmw/qv/internal/validator"
+	"encoding/json"
+	"errors"
+	"github.com/go-playground/form/v4"
+	"net/http"
+)
 
 func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) {
-	var (
-		method = r.Method
-		uri    = r.URL.RequestURI()
-	)
-	app.logger.Error(err.Error(), "method", method, "uri", uri)
-	http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+	w.WriteHeader(http.StatusInternalServerError)
+	var response = api.ErrorResponse{
+		Code:    http.StatusInternalServerError,
+		Details: nil,
+		Message: "There was an error in the request",
+	}
+	json.NewEncoder(w).Encode(response)
+}
+
+func (app *application) clientError(w http.ResponseWriter, status int, message string) {
+	w.WriteHeader(status)
+	var response = api.ErrorResponse{
+		Code: http.StatusUnprocessableEntity,
+		Details: &map[string]interface{}{
+			"error": message,
+		},
+		Message: "There was an error in the request",
+	}
+	json.NewEncoder(w).Encode(response)
+}
+
+func (app *application) unprocessableEntityError(w http.ResponseWriter, v validator.Validator) {
+	w.WriteHeader(http.StatusUnprocessableEntity)
+	var response = api.ErrorResponse{
+		Code: http.StatusUnprocessableEntity,
+		Details: &map[string]interface{}{
+			"fields": v.FieldErrors,
+		},
+		Message: "Election data is invalid",
+	}
+	json.NewEncoder(w).Encode(response)
+}
+
+func (app *application) decodePostForm(r *http.Request, dst any) error {
+	err := r.ParseForm()
+	if err != nil {
+		return err
+	}
+
+	err = app.formDecoder.Decode(dst, r.PostForm)
+	if err != nil {
+		var invalidDecoderError *form.InvalidDecoderError
+		if errors.As(err, &invalidDecoderError) {
+			panic(err)
+		}
+
+		return err
+	}
+
+	return nil
 }