feat(libhttp): move into the Portainer repository EE-5475 (#10231)

pkg/libhttp/request/payload.go

@@ -0,0 +1,37 @@
+package request
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/pkg/errors"
+)
+
+// PayloadValidation is an interface used to validate the payload of a request.
+type PayloadValidation interface {
+	Validate(request *http.Request) error
+}
+
+// DecodeAndValidateJSONPayload decodes the body of the request into an object
+// implementing the PayloadValidation interface.
+// It also triggers a validation of object content.
+func DecodeAndValidateJSONPayload(request *http.Request, v PayloadValidation) error {
+	if err := json.NewDecoder(request.Body).Decode(v); err != nil {
+		return err
+	}
+	return v.Validate(request)
+}
+
+// GetPayload decodes the body of the request into an object implementing the PayloadValidation interface.
+func GetPayload[T any, PT interface {
+	*T
+	Validate(request *http.Request) error
+}](r *http.Request) (PT, error) {
+	p := PT(new(T))
+
+	err := DecodeAndValidateJSONPayload(r, p)
+	if err != nil {
+		return nil, errors.WithMessage(err, "Invalid request payload")
+	}
+	return p, nil
+}