removed intermediate /internal directory

server/param/spec.go

@@ -0,0 +1,76 @@
+package param
+
+import (
+	"encoding"
+
+	"github.com/gin-gonic/gin"
+
+	"ruben/inventory2/server/response"
+)
+
+// Spec is the entry point of the package.
+// It's typically constructed via Path() or Form().
+// But it's zero value is valid.
+//
+// It's methods support a builder pattern to minimize API bloat.
+//
+// To complete gin parameter parsing, call Unmarshal().
+type Spec struct {
+	path map[string]encoding.TextUnmarshaler
+	form map[string]encoding.TextUnmarshaler
+}
+
+func Path(k string, dst encoding.TextUnmarshaler) Spec {
+	return Spec{
+		path: map[string]encoding.TextUnmarshaler{
+			k: dst,
+		},
+	}
+}
+
+func Form(k string, dst encoding.TextUnmarshaler) Spec {
+	return Spec{
+		form: map[string]encoding.TextUnmarshaler{
+			k: dst,
+		},
+	}
+}
+
+func (s Spec) Path(k string, dst encoding.TextUnmarshaler) Spec {
+	if s.path == nil {
+		s.path = make(map[string]encoding.TextUnmarshaler, 1)
+	}
+	s.path[k] = dst
+	return s
+}
+
+func (s Spec) Form(k string, dst encoding.TextUnmarshaler) Spec {
+	if s.form == nil {
+		s.form = make(map[string]encoding.TextUnmarshaler, 1)
+	}
+	s.form[k] = dst
+	return s
+}
+
+func (s Spec) Unmarshal(c *gin.Context) error {
+	for k, dst := range s.path {
+		v := c.Param(k)
+		if v == "" {
+			return response.NotFound().Msgf("no %s provided", k)
+		}
+		if err := dst.UnmarshalText([]byte(v)); err != nil {
+			return response.NotFound().Wrap(err).Msgf("invalid %s", k)
+		}
+	}
+	for k, dst := range s.form {
+		v, ok := c.GetPostForm(k)
+		if !ok || v == "" {
+			return response.BadRequest().Msgf("no %s provided", k)
+		}
+		if err := dst.UnmarshalText([]byte(v)); err != nil {
+			return response.BadRequest().Wrap(err).Msgf("invalid %s provided", k)
+		}
+	}
+
+	return nil
+}