ch9.3

cmd/web/helpers.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"runtime/debug"
+
+	"github.com/go-playground/form/v4"
 )
 
 func (app *application) serverError(w http.ResponseWriter, err error) {
@@ -20,3 +23,20 @@ func (app *application) clientError(w http.ResponseWriter, status int) {
 func (app *application) notFound(w http.ResponseWriter) {
 	app.clientError(w, http.StatusNotFound)
 }
+
+func (app *application) decodePostForm(r *http.Request, snippetForm *snippetCreateForm) error {
+	err := r.ParseForm()
+	if err != nil {
+		return err
+	}
+
+	err = app.formDecoder.Decode(&snippetForm, r.PostForm)
+	if err != nil {
+		var invalidDecoderError *form.InvalidDecoderError
+		if errors.As(err, &invalidDecoderError) {
+			panic("Invalid decoder error")
+		}
+		return err
+	}
+	return nil
+}