feat(forms,errors): error helper for form and query parsing

handlers/pages/dashboard.templ

@@ -4,13 +4,19 @@ import (
 	"net/http"
 	"errors"
 	"log"
+	"strconv"
 
 	"forge.capytal.company/capytalcode/project-comicverse/lib/router/rerrors"
 	"forge.capytal.company/capytalcode/project-comicverse/lib/cookies"
+	"forge.capytal.company/capytalcode/project-comicverse/lib/forms"
 	"forge.capytal.company/capytalcode/project-comicverse/templates/layouts"
 )
 
-type Dashboard struct{}
+type Dashboard struct {
+	Message  string  `form:"message"`
+	Limit    int     `form:"limit"`
+	Optional *string `form:"optional"`
+}
 
 type DashboardCookie struct {
 	Hello string `cookie:"dashboard-cookie"`
@@ -19,6 +25,11 @@ type DashboardCookie struct {
 }
 
 func (p *Dashboard) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if err := forms.Unmarshal(r, p); err != nil {
+		forms.RerrUnsmarshal(err).ServeHTTP(w, r)
+		return
+	}
+
 	hasCookie := true
 
 	var c DashboardCookie
@@ -49,9 +60,13 @@ func (p *Dashboard) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 templ (p *Dashboard) Component() {
 	@layouts.Page() {
 		<div class="text-danger-100 font-sans">
-			<p>Hello world</p>
-			<p>test</p>
-			<p>test</p>
+			<p>{ p.Message }</p>
+			<p>{ strconv.Itoa(p.Limit) }</p>
+			if p.Optional != nil {
+				<p>{ *p.Optional }</p>
+			} else {
+				<p>nil</p>
+			}
 		</div>
 	}
 }

lib/forms/forms.go

@@ -9,6 +9,9 @@ import (
 	"strconv"
 	"strings"
 
+	"forge.capytal.company/capytalcode/project-comicverse/lib/router/rerrors"
+)
+
 func Unmarshal(r *http.Request, v any) (err error) {
 	if u, ok := v.(Unmarshaler); ok {
 		return u.UnmarshalForm(r)
@@ -91,6 +94,16 @@ func Unmarshal(r *http.Request, v any) (err error) {
 	return nil
 }
 
+func RerrUnsmarshal(err error) rerrors.RouteError {
+	if e, ok := err.(*ErrMissingRequiredValue); ok {
+		return rerrors.MissingParameters([]string{e.value})
+	} else if e, ok := err.(*ErrInvalidValueType); ok {
+		return rerrors.BadRequest(e.Error())
+	} else {
+		return rerrors.InternalError(err)
+	}
+}
+
 func setFieldValue(rv reflect.Value, v string) error {
 	switch rv.Kind() {