Validation for label keys and values according to Kubernetes specific…

…ation

Signed-off-by: Norwin Schnyder <norwin.schnyder+github@gmail.com>

apis/v1/gateway_types.go

@@ -683,7 +683,8 @@ type GatewayInfrastructure struct {
 	//
 	// +optional
 	// +kubebuilder:validation:MaxProperties=8
-	Labels map[AnnotationKey]AnnotationValue `json:"labels,omitempty"`
+	// +kubebuilder:validation:XValidation:message="Label keys must be in the form of an optional DNS subdomain prefix followed by a required name segment of up to 63 characters.",rule="self.all(key, key.matches(r\"\"\"^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?([A-Za-z0-9][-A-Za-z0-9_.]{0,61})?[A-Za-z0-9]$\"\"\"))"
+	Labels map[LabelKey]LabelValue `json:"labels,omitempty"`
 
 	// Annotations that SHOULD be applied to any resources created in response to this Gateway.
 	//
@@ -696,6 +697,7 @@ type GatewayInfrastructure struct {
 	//
 	// +optional
 	// +kubebuilder:validation:MaxProperties=8
+	// +kubebuilder:validation:XValidation:message="Annotation keys must be in the form of an optional DNS subdomain prefix followed by a required name segment of up to 63 characters.",rule="self.all(key, key.matches(r\"\"\"^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?([A-Za-z0-9][-A-Za-z0-9_.]{0,61})?[A-Za-z0-9]$\"\"\"))"
 	Annotations map[AnnotationKey]AnnotationValue `json:"annotations,omitempty"`
 
 	// ParametersRef is a reference to a resource that contains the configuration

apis/v1/shared_types.go

@@ -666,7 +666,7 @@ type GatewayController string
 //
 // +kubebuilder:validation:MinLength=1
 // +kubebuilder:validation:MaxLength=253
-// +kubebuilder:validation:Pattern=`^(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]/?)*$`
+// +kubebuilder:validation:Pattern=`^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?([A-Za-z0-9][-A-Za-z0-9_.]{0,61})?[A-Za-z0-9]$`
 type AnnotationKey string
 
 // AnnotationValue is the value of an annotation in Gateway API. This is used
@@ -678,6 +678,45 @@ type AnnotationKey string
 // +kubebuilder:validation:MaxLength=4096
 type AnnotationValue string
 
+// LabelKey is the key of a label in the Gateway API. This is used for validation
+// of maps such as Gateway infrastructure labels. This matches the Kubernetes
+// "qualified name" validation that is used for labels.
+//
+// Valid values include:
+//
+// * example
+// * example.com
+// * example.com/path
+// * example.com/path.html
+//
+// Invalid values include:
+//
+// * example~ - "~" is an invalid character
+// * example.com. - can not start or end with "."
+//
+// +kubebuilder:validation:MinLength=1
+// +kubebuilder:validation:MaxLength=253
+// +kubebuilder:validation:Pattern=`^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?([A-Za-z0-9][-A-Za-z0-9_.]{0,61})?[A-Za-z0-9]$`
+type LabelKey string
+
+// LabelValue is the value of a label in the Gateway API. This is used for validation
+// of maps such as Gateway infrastructure labels. This matches the Kubernetes
+// label validation rules:
+// * must be 63 characters or less (can be empty),
+// * unless empty, must begin and end with an alphanumeric character ([a-z0-9A-Z]),
+// * could contain dashes (-), underscores (_), dots (.), and alphanumerics between.
+//
+// Valid values include:
+//
+// * MyValue
+// * my.name
+// * 123-my-value
+//
+// +kubebuilder:validation:MinLength=0
+// +kubebuilder:validation:MaxLength=63
+// +kubebuilder:validation:Pattern=`^(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?$`
+type LabelValue string
+
 // AddressType defines how a network address is represented as a text string.
 // This may take two possible forms:
 //