init

internal/server/helpers.go

@@ -0,0 +1,83 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/a-h/templ"
+	"github.com/go-playground/validator/v10"
+
+	"gopics.develent.net/internal/components"
+)
+
+// Extract form and validate fields
+func (srv *server) bindAndValidate(r *http.Request, form any) (map[string]string, error) {
+
+	err := r.ParseForm()
+	if err != nil {
+		return nil, err
+	}
+
+	err = srv.formDecoder.Decode(form, r.PostForm)
+	if err != nil {
+		return nil, err
+	}
+
+	err = srv.validate.Struct(form)
+	if err != nil {
+		ve, ok := err.(validator.ValidationErrors)
+		srv.logger.Info("BnV Validation", "ok", ok, "ve", ve)
+		if ok {
+			return mapValidationErrors(ve), nil // validation failed
+		}
+		return nil, err // something else went wrong
+
+	}
+
+	return nil, nil // valid
+}
+
+// Render TEMPL pages
+func (srv *server) RenderPage(w http.ResponseWriter, r *http.Request, status int, page templ.Component, title string) {
+	w.WriteHeader(status)
+	flash := srv.sessionManager.PopString(r.Context(), "flash")
+	components.Base(page, title, flash).Render(r.Context(), w)
+}
+
+// Inject flash messages into context
+func (srv *server) PutFlash(ctx context.Context, msg string) {
+	srv.sessionManager.Put(ctx, "flash", msg)
+}
+
+// Pop flash messages from context
+func (srv *server) PopFlash(ctx context.Context) string {
+	srv.logger.Info("Pre-Pop", "flash", srv.sessionManager.GetString(ctx, "flash"))
+	flash := srv.sessionManager.PopString(ctx, "flash")
+	srv.logger.Info("Post-Pop", "flash", srv.sessionManager.GetString(ctx, "flash"))
+	return flash
+}
+
+// Map validator errors to user presentable errors
+func mapValidationErrors(errs validator.ValidationErrors) map[string]string {
+	errors := make(map[string]string)
+	for _, fe := range errs {
+		field := fe.Field()
+		tag := fe.Tag()
+		var msg string
+
+		switch tag {
+		case "required":
+			msg = fmt.Sprintf("%s is required", field)
+		case "email":
+			msg = "Invalid email format"
+		case "gte":
+			msg = fmt.Sprintf("%s must be %s or greater", field, fe.Param())
+		default:
+			msg = fmt.Sprintf("%s is not valid", field)
+		}
+		errors[field] = msg
+	}
+
+	return errors
+}