Merge pull request #115969 from DangerOnTheRanger/messageExpression-for-crd

Add messageExpression field for CRD validation

api/openapi-spec/swagger.json

@@ -14811,6 +14811,10 @@
           "description": "Message represents the message displayed when validation fails. The message is required if the Rule contains line breaks. The message must not contain line breaks. If unset, the message is \"failed rule: {Rule}\". e.g. \"must be a URL with the host matching spec.host\"",
           "type": "string"
         },
+        "messageExpression": {
+          "description": "MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails. Since messageExpression is used as a failure message, it must evaluate to a string. If both message and messageExpression are present on a rule, then messageExpression will be used if validation fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged. messageExpression has access to all the same variables as the rule; the only difference is the return type. Example: \"x must be less than max (\"+string(self.max)+\")\"",
+          "type": "string"
+        },
         "rule": {
           "description": "Rule represents the expression which will be evaluated by CEL. ref: https://github.com/google/cel-spec The Rule is scoped to the location of the x-kubernetes-validations extension in the schema. The `self` variable in the CEL expression is bound to the scoped value. Example: - Rule scoped to the root of a resource with a status subresource: {\"rule\": \"self.status.actual <= self.spec.maxDesired\"}\n\nIf the Rule is scoped to an object with properties, the accessible properties of the object are field selectable via `self.field` and field presence can be checked via `has(self.field)`. Null valued fields are treated as absent fields in CEL expressions. If the Rule is scoped to an object with additionalProperties (i.e. a map) the value of the map are accessible via `self[mapKey]`, map containment can be checked via `mapKey in self` and all entries of the map are accessible via CEL macros and functions such as `self.all(...)`. If the Rule is scoped to an array, the elements of the array are accessible via `self[i]` and also by macros and functions. If the Rule is scoped to a scalar, `self` is bound to the scalar value. Examples: - Rule scoped to a map of objects: {\"rule\": \"self.components['Widget'].priority < 10\"} - Rule scoped to a list of integers: {\"rule\": \"self.values.all(value, value >= 0 && value < 100)\"} - Rule scoped to a string value: {\"rule\": \"self.startsWith('kube')\"}\n\nThe `apiVersion`, `kind`, `metadata.name` and `metadata.generateName` are always accessible from the root of the object and from any x-kubernetes-embedded-resource annotated objects. No other metadata properties are accessible.\n\nUnknown data preserved in custom resources via x-kubernetes-preserve-unknown-fields is not accessible in CEL expressions. This includes: - Unknown field values that are preserved by object schemas with x-kubernetes-preserve-unknown-fields. - Object properties where the property schema is of an \"unknown type\". An \"unknown type\" is recursively defined as:\n  - A schema with no type and x-kubernetes-preserve-unknown-fields set to true\n  - An array where the items schema is of an \"unknown type\"\n  - An object where the additionalProperties schema is of an \"unknown type\"\n\nOnly property names of the form `[a-zA-Z_.-/][a-zA-Z0-9_.-/]*` are accessible. Accessible property names are escaped according to the following rules when accessed in the expression: - '__' escapes to '__underscores__' - '.' escapes to '__dot__' - '-' escapes to '__dash__' - '/' escapes to '__slash__' - Property names that exactly match a CEL RESERVED keyword escape to '__{keyword}__'. The keywords are:\n\t  \"true\", \"false\", \"null\", \"in\", \"as\", \"break\", \"const\", \"continue\", \"else\", \"for\", \"function\", \"if\",\n\t  \"import\", \"let\", \"loop\", \"package\", \"namespace\", \"return\".\nExamples:\n  - Rule accessing a property named \"namespace\": {\"rule\": \"self.__namespace__ > 0\"}\n  - Rule accessing a property named \"x-prop\": {\"rule\": \"self.x__dash__prop > 0\"}\n  - Rule accessing a property named \"redact__d\": {\"rule\": \"self.redact__underscores__d > 0\"}\n\nEquality on arrays with x-kubernetes-list-type of 'set' or 'map' ignores element order, i.e. [1, 2] == [2, 1]. Concatenation on arrays with x-kubernetes-list-type use the semantics of the list type:\n  - 'set': `X + Y` performs a union where the array positions of all elements in `X` are preserved and\n    non-intersecting elements in `Y` are appended, retaining their partial order.\n  - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values\n    are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with\n    non-intersecting keys are appended, retaining their partial order.",
           "type": "string"

api/openapi-spec/v3/apis__apiextensions.k8s.io__v1_openapi.json

@@ -765,6 +765,10 @@
             "description": "Message represents the message displayed when validation fails. The message is required if the Rule contains line breaks. The message must not contain line breaks. If unset, the message is \"failed rule: {Rule}\". e.g. \"must be a URL with the host matching spec.host\"",
             "type": "string"
           },
+          "messageExpression": {
+            "description": "MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails. Since messageExpression is used as a failure message, it must evaluate to a string. If both message and messageExpression are present on a rule, then messageExpression will be used if validation fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged. messageExpression has access to all the same variables as the rule; the only difference is the return type. Example: \"x must be less than max (\"+string(self.max)+\")\"",
+            "type": "string"
+          },
           "rule": {
             "default": "",
             "description": "Rule represents the expression which will be evaluated by CEL. ref: https://github.com/google/cel-spec The Rule is scoped to the location of the x-kubernetes-validations extension in the schema. The `self` variable in the CEL expression is bound to the scoped value. Example: - Rule scoped to the root of a resource with a status subresource: {\"rule\": \"self.status.actual <= self.spec.maxDesired\"}\n\nIf the Rule is scoped to an object with properties, the accessible properties of the object are field selectable via `self.field` and field presence can be checked via `has(self.field)`. Null valued fields are treated as absent fields in CEL expressions. If the Rule is scoped to an object with additionalProperties (i.e. a map) the value of the map are accessible via `self[mapKey]`, map containment can be checked via `mapKey in self` and all entries of the map are accessible via CEL macros and functions such as `self.all(...)`. If the Rule is scoped to an array, the elements of the array are accessible via `self[i]` and also by macros and functions. If the Rule is scoped to a scalar, `self` is bound to the scalar value. Examples: - Rule scoped to a map of objects: {\"rule\": \"self.components['Widget'].priority < 10\"} - Rule scoped to a list of integers: {\"rule\": \"self.values.all(value, value >= 0 && value < 100)\"} - Rule scoped to a string value: {\"rule\": \"self.startsWith('kube')\"}\n\nThe `apiVersion`, `kind`, `metadata.name` and `metadata.generateName` are always accessible from the root of the object and from any x-kubernetes-embedded-resource annotated objects. No other metadata properties are accessible.\n\nUnknown data preserved in custom resources via x-kubernetes-preserve-unknown-fields is not accessible in CEL expressions. This includes: - Unknown field values that are preserved by object schemas with x-kubernetes-preserve-unknown-fields. - Object properties where the property schema is of an \"unknown type\". An \"unknown type\" is recursively defined as:\n  - A schema with no type and x-kubernetes-preserve-unknown-fields set to true\n  - An array where the items schema is of an \"unknown type\"\n  - An object where the additionalProperties schema is of an \"unknown type\"\n\nOnly property names of the form `[a-zA-Z_.-/][a-zA-Z0-9_.-/]*` are accessible. Accessible property names are escaped according to the following rules when accessed in the expression: - '__' escapes to '__underscores__' - '.' escapes to '__dot__' - '-' escapes to '__dash__' - '/' escapes to '__slash__' - Property names that exactly match a CEL RESERVED keyword escape to '__{keyword}__'. The keywords are:\n\t  \"true\", \"false\", \"null\", \"in\", \"as\", \"break\", \"const\", \"continue\", \"else\", \"for\", \"function\", \"if\",\n\t  \"import\", \"let\", \"loop\", \"package\", \"namespace\", \"return\".\nExamples:\n  - Rule accessing a property named \"namespace\": {\"rule\": \"self.__namespace__ > 0\"}\n  - Rule accessing a property named \"x-prop\": {\"rule\": \"self.x__dash__prop > 0\"}\n  - Rule accessing a property named \"redact__d\": {\"rule\": \"self.redact__underscores__d > 0\"}\n\nEquality on arrays with x-kubernetes-list-type of 'set' or 'map' ignores element order, i.e. [1, 2] == [2, 1]. Concatenation on arrays with x-kubernetes-list-type use the semantics of the list type:\n  - 'set': `X + Y` performs a union where the array positions of all elements in `X` are preserved and\n    non-intersecting elements in `Y` are appended, retaining their partial order.\n  - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values\n    are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with\n    non-intersecting keys are appended, retaining their partial order.",

pkg/generated/openapi/zz_generated.openapi.go

@@ -45713,6 +45713,13 @@ func schema_pkg_apis_apiextensions_v1_ValidationRule(ref common.ReferenceCallbac
 							Format:      "",
 						},
 					},
+					"messageExpression": {
+						SchemaProps: spec.SchemaProps{
+							Description: "MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails. Since messageExpression is used as a failure message, it must evaluate to a string. If both message and messageExpression are present on a rule, then messageExpression will be used if validation fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged. messageExpression has access to all the same variables as the rule; the only difference is the return type. Example: \"x must be less than max (\"+string(self.max)+\")\"",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
 				},
 				Required: []string{"rule"},
 			},
@@ -47104,6 +47111,13 @@ func schema_pkg_apis_apiextensions_v1beta1_ValidationRule(ref common.ReferenceCa
 							Format:      "",
 						},
 					},
+					"messageExpression": {
+						SchemaProps: spec.SchemaProps{
+							Description: "MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails. Since messageExpression is used as a failure message, it must evaluate to a string. If both message and messageExpression are present on a rule, then messageExpression will be used if validation fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged. messageExpression has access to all the same variables as the rule; the only difference is the return type. Example: \"x must be less than max (\"+string(self.max)+\")\"",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
 				},
 				Required: []string{"rule"},
 			},

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/types_jsonschema.go

@@ -196,6 +196,18 @@ type ValidationRule struct {
 	// If unset, the message is "failed rule: {Rule}".
 	// e.g. "must be a URL with the host matching spec.host"
 	Message string
+	// MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
+	// Since messageExpression is used as a failure message, it must evaluate to a string.
+	// If both message and messageExpression are present on a rule, then messageExpression will be used if validation
+	// fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced
+	// as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
+	// that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
+	// the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.
+	// messageExpression has access to all the same variables as the rule; the only difference is the return type.
+	// Example:
+	// "x must be less than max ("+string(self.max)+")"
+	// +optional
+	MessageExpression string
 }
 
 // JSON represents any valid JSON value.

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1/generated.pb.go

@@ -814,198 +814,199 @@ func init() {
 }
 
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-	0x36, 0x7b, 0xee, 0x8d, 0x1b, 0x27, 0xfd, 0x19, 0xee, 0xff, 0x02, 0x00, 0x00, 0xff, 0xff, 0xc0,
+	0x67, 0xb3, 0xe7, 0xde, 0x6d, 0xce, 0x1a, 0x1f, 0x37, 0x67, 0x8d, 0x4f, 0x9a, 0xb3, 0xc6, 0xa7,
-	0x20, 0xb3, 0x2b, 0xda, 0x2b, 0x00, 0x00,
+	0xcd, 0x59, 0xe3, 0xaf, 0xcd, 0x59, 0xe3, 0x27, 0x7f, 0x9b, 0x3d, 0xf7, 0xc6, 0x8d, 0x93, 0x7e,
+	0xd0, 0xfb, 0xbf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x41, 0x66, 0xfd, 0x82, 0x24, 0x2c, 0x00, 0x00,
 }
 
 func (m *ConversionRequest) Marshal() (dAtA []byte, err error) {
@@ -2629,6 +2630,11 @@ func (m *ValidationRule) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	i -= len(m.MessageExpression)
+	copy(dAtA[i:], m.MessageExpression)
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MessageExpression)))
+	i--
+	dAtA[i] = 0x1a
 	i -= len(m.Message)
 	copy(dAtA[i:], m.Message)
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Message)))
@@ -3338,6 +3344,8 @@ func (m *ValidationRule) Size() (n int) {
 	n += 1 + l + sovGenerated(uint64(l))
 	l = len(m.Message)
 	n += 1 + l + sovGenerated(uint64(l))
+	l = len(m.MessageExpression)
+	n += 1 + l + sovGenerated(uint64(l))
 	return n
 }
 
@@ -3813,6 +3821,7 @@ func (this *ValidationRule) String() string {
 	s := strings.Join([]string{`&ValidationRule{`,
 		`Rule:` + fmt.Sprintf("%v", this.Rule) + `,`,
 		`Message:` + fmt.Sprintf("%v", this.Message) + `,`,
+		`MessageExpression:` + fmt.Sprintf("%v", this.MessageExpression) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -8879,6 +8888,38 @@ func (m *ValidationRule) Unmarshal(dAtA []byte) error {
 			}
 			m.Message = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MessageExpression", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MessageExpression = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1/generated.proto

@@ -665,6 +665,19 @@ message ValidationRule {
   // If unset, the message is "failed rule: {Rule}".
   // e.g. "must be a URL with the host matching spec.host"
   optional string message = 2;
+
+  // MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
+  // Since messageExpression is used as a failure message, it must evaluate to a string.
+  // If both message and messageExpression are present on a rule, then messageExpression will be used if validation
+  // fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced
+  // as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
+  // that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
+  // the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.
+  // messageExpression has access to all the same variables as the rule; the only difference is the return type.
+  // Example:
+  // "x must be less than max ("+string(self.max)+")"
+  // +optional
+  optional string messageExpression = 3;
 }
 
 // WebhookClientConfig contains the information to make a TLS connection with the webhook.

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1/types_jsonschema.go

@@ -235,6 +235,18 @@ type ValidationRule struct {
 	// If unset, the message is "failed rule: {Rule}".
 	// e.g. "must be a URL with the host matching spec.host"
 	Message string `json:"message,omitempty" protobuf:"bytes,2,opt,name=message"`
+	// MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
+	// Since messageExpression is used as a failure message, it must evaluate to a string.
+	// If both message and messageExpression are present on a rule, then messageExpression will be used if validation
+	// fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced
+	// as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
+	// that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
+	// the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.
+	// messageExpression has access to all the same variables as the rule; the only difference is the return type.
+	// Example:
+	// "x must be less than max ("+string(self.max)+")"
+	// +optional
+	MessageExpression string `json:"messageExpression,omitempty" protobuf:"bytes,3,opt,name=messageExpression"`
 }
 
 // JSON represents any valid JSON value.

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1/zz_generated.conversion.go

@@ -1258,6 +1258,7 @@ func Convert_apiextensions_ServiceReference_To_v1_ServiceReference(in *apiextens
 func autoConvert_v1_ValidationRule_To_apiextensions_ValidationRule(in *ValidationRule, out *apiextensions.ValidationRule, s conversion.Scope) error {
 	out.Rule = in.Rule
 	out.Message = in.Message
+	out.MessageExpression = in.MessageExpression
 	return nil
 }
 
@@ -1269,6 +1270,7 @@ func Convert_v1_ValidationRule_To_apiextensions_ValidationRule(in *ValidationRul
 func autoConvert_apiextensions_ValidationRule_To_v1_ValidationRule(in *apiextensions.ValidationRule, out *ValidationRule, s conversion.Scope) error {
 	out.Rule = in.Rule
 	out.Message = in.Message
+	out.MessageExpression = in.MessageExpression
 	return nil
 }
 

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/generated.pb.go

@@ -785,200 +785,202 @@ func init() {
 }
 
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-	0x21, 0x43, 0x8f, 0xbb, 0x03, 0x24, 0x8c, 0x3f, 0x9b, 0x79, 0xc6, 0x98, 0x7d, 0xdf, 0x00, 0x33,
+	0x96, 0x1b, 0xc5, 0x43, 0x86, 0x3e, 0x77, 0x07, 0x48, 0x18, 0x7f, 0x36, 0xf3, 0x8c, 0x31, 0xf3,
-	0x9d, 0x0f, 0x9e, 0x7b, 0xea, 0xd6, 0x2f, 0x0c, 0x30, 0xd5, 0x76, 0xc6, 0x74, 0xf0, 0xe8, 0x56,
+	0xbe, 0x01, 0xa6, 0xbb, 0x1f, 0x3c, 0xf7, 0xd4, 0xad, 0x9f, 0x19, 0x60, 0xb2, 0xe3, 0x8c, 0xe9,
-	0xab, 0x47, 0xaf, 0xf4, 0xfa, 0xb0, 0x10, 0x9b, 0x83, 0x77, 0xc8, 0xba, 0x7b, 0x3f, 0x36, 0xc0,
+	0xe2, 0xd1, 0xad, 0x76, 0x8f, 0x5e, 0xe9, 0xf7, 0x61, 0x21, 0x36, 0x07, 0xef, 0x90, 0x75, 0xf7,
-	0x64, 0xba, 0x6c, 0xdf, 0xcb, 0x78, 0x15, 0xde, 0xcf, 0x80, 0x99, 0xce, 0x8d, 0x3d, 0x0c, 0xd4,
+	0x7e, 0x68, 0x80, 0x89, 0x74, 0xd9, 0xbe, 0x97, 0xf1, 0x2a, 0xbe, 0x9f, 0x01, 0xd3, 0xdd, 0x1b,
-	0x04, 0xa3, 0x3f, 0x93, 0xa0, 0x4e, 0x53, 0xe3, 0x77, 0x0c, 0x30, 0xfa, 0x96, 0x92, 0x8b, 0xbf,
+	0x7b, 0x48, 0xd4, 0x04, 0x63, 0x30, 0x93, 0xa0, 0x6e, 0x53, 0xe3, 0x77, 0x0c, 0x30, 0xf6, 0x96,
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+	0x92, 0x8b, 0xdf, 0xba, 0xf7, 0x7d, 0x06, 0x15, 0x9f, 0x93, 0x09, 0x83, 0x22, 0x1d, 0xb7, 0xf8,
-	0x77, 0x6c, 0x00, 0xe0, 0x15, 0x30, 0x84, 0x1d, 0xc7, 0x3b, 0x12, 0xa3, 0x44, 0xed, 0x1b, 0xc1,
+	0x7b, 0x03, 0x4c, 0x75, 0x6d, 0x00, 0xe0, 0x15, 0x30, 0x6c, 0xb9, 0xae, 0x7f, 0x28, 0x46, 0x89,
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+	0xda, 0x3b, 0x82, 0x65, 0x4e, 0x45, 0x92, 0xab, 0x45, 0x2f, 0xf3, 0x59, 0x45, 0xaf, 0xf8, 0x27,
-	0x2e, 0x13, 0xef, 0xc9, 0x92, 0x2e, 0x82, 0x9c, 0x6c, 0xde, 0x4f, 0xf8, 0x72, 0xca, 0x52, 0x2c,
+	0x03, 0x5c, 0xbe, 0x5d, 0x26, 0xde, 0x93, 0x25, 0x5d, 0x00, 0x79, 0xd9, 0xbc, 0x1f, 0xf3, 0xe5,
-	0x8b, 0x06, 0xff, 0xa3, 0x99, 0xf8, 0x55, 0xf8, 0xc0, 0x00, 0x93, 0x65, 0x12, 0xd4, 0xed, 0x0a,
+	0x94, 0xa5, 0x58, 0x16, 0x0d, 0xfe, 0xa1, 0x99, 0xf8, 0x55, 0xfc, 0xc0, 0x00, 0x13, 0x15, 0x4c,
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-	0x4f, 0x37, 0x53, 0x32, 0xe4, 0x23, 0x5b, 0x31, 0x03, 0x25, 0x32, 0xea, 0x33, 0x4f, 0xa6, 0xeb,
+	0xb0, 0xaa, 0xf1, 0xab, 0x9b, 0x49, 0x19, 0xf2, 0xd1, 0xcd, 0x98, 0x81, 0x12, 0x19, 0xf5, 0x9a,
-	0x67, 0x9e, 0xcb, 0x60, 0xd0, 0x4f, 0x06, 0xd1, 0x39, 0xc6, 0xe5, 0xb3, 0x67, 0x4e, 0xe5, 0x5c,
+	0x27, 0xd3, 0xf3, 0x35, 0xcf, 0x65, 0x30, 0x14, 0x24, 0x83, 0xe8, 0x3c, 0xe3, 0xf2, 0xd9, 0x33,
-	0x2f, 0x08, 0xf9, 0x74, 0x2d, 0x2b, 0xb9, 0x5e, 0x10, 0x22, 0x4e, 0x2d, 0xbc, 0x06, 0xce, 0xb7,
+	0xa7, 0x72, 0xae, 0x4f, 0x42, 0x3e, 0x5d, 0xcb, 0x49, 0xae, 0x4f, 0x42, 0xc4, 0xa9, 0xc5, 0x5f,
-	0x96, 0x71, 0x86, 0x17, 0x44, 0x4e, 0xdb, 0x67, 0x25, 0xc6, 0x43, 0x9c, 0xa3, 0xff, 0xdb, 0x25,
+	0x1b, 0xe0, 0x5c, 0x7b, 0x1d, 0x67, 0x80, 0x24, 0x72, 0x3b, 0xde, 0x2b, 0x31, 0x1e, 0xe2, 0x1c,
-	0x73, 0x87, 0x7f, 0xbb, 0xfc, 0xc5, 0x00, 0x9d, 0xfe, 0x71, 0x06, 0x2f, 0x89, 0xf9, 0xa5, 0x36,
+	0xfd, 0x73, 0x97, 0xcc, 0xed, 0x3f, 0x77, 0x81, 0xcf, 0x83, 0x49, 0xf9, 0x73, 0xed, 0x28, 0x20,
-	0x14, 0x8c, 0x67, 0x97, 0xb0, 0x0e, 0x86, 0xa9, 0x08, 0x9a, 0x5c, 0xd4, 0xed, 0x33, 0x2e, 0x6a,
+	0x98, 0xf2, 0x77, 0xa7, 0xd9, 0xf6, 0x8f, 0x66, 0x37, 0xd2, 0x02, 0xa8, 0x53, 0xa7, 0xf8, 0x67,
-	0x7a, 0x09, 0x44, 0xe3, 0x14, 0x53, 0x63, 0x30, 0xb6, 0xae, 0x15, 0x5c, 0x8a, 0x5c, 0x4b, 0x8e,
+	0x03, 0x74, 0xfb, 0x76, 0x0d, 0x5e, 0x12, 0x93, 0x50, 0x6d, 0xbc, 0x18, 0x4f, 0x41, 0x61, 0x03,
-	0xb4, 0xc7, 0xc4, 0xba, 0xae, 0xae, 0x08, 0x1a, 0x52, 0xdc, 0x52, 0xe5, 0xc3, 0x4f, 0xe6, 0xce,
+	0x8c, 0x50, 0x11, 0x7e, 0x99, 0x1e, 0x5b, 0xa7, 0x4c, 0x8f, 0xf4, 0x62, 0x8a, 0x16, 0x2c, 0xa6,
-	0x7d, 0xf4, 0xc9, 0xdc, 0xb9, 0x8f, 0x3f, 0x99, 0x3b, 0xf7, 0xad, 0xe6, 0x9c, 0xf1, 0x61, 0x73,
+	0xc6, 0x60, 0x2c, 0x43, 0xaa, 0x56, 0x39, 0xf2, 0x6c, 0x39, 0x1c, 0x1f, 0x17, 0x19, 0xb2, 0xb2,
-	0xce, 0xf8, 0xa8, 0x39, 0x67, 0x7c, 0xdc, 0x9c, 0x33, 0xfe, 0xd1, 0x9c, 0x33, 0x7e, 0xf2, 0xcf,
+	0x2c, 0x68, 0x48, 0x71, 0xcb, 0xd5, 0x0f, 0x3f, 0x99, 0x3d, 0xf3, 0xd1, 0x27, 0xb3, 0x67, 0x3e,
-	0xb9, 0x73, 0x5f, 0x7b, 0xee, 0x4c, 0x7f, 0xf2, 0xfe, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xcb,
+	0xfe, 0x64, 0xf6, 0xcc, 0x37, 0x5a, 0xb3, 0xc6, 0x87, 0xad, 0x59, 0xe3, 0xa3, 0xd6, 0xac, 0xf1,
-	0x02, 0xc9, 0x93, 0x3d, 0x2e, 0x00, 0x00,
+	0x71, 0x6b, 0xd6, 0xf8, 0x7b, 0x6b, 0xd6, 0xf8, 0xd1, 0x3f, 0x66, 0xcf, 0x7c, 0xe5, 0xb9, 0x53,
+	0x7d, 0x2e, 0xfe, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x11, 0x77, 0x12, 0x7e, 0x87, 0x2e, 0x00,
+	0x00,
 }
 
 func (m *ConversionRequest) Marshal() (dAtA []byte, err error) {
@@ -2656,6 +2658,11 @@ func (m *ValidationRule) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	i -= len(m.MessageExpression)
+	copy(dAtA[i:], m.MessageExpression)
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MessageExpression)))
+	i--
+	dAtA[i] = 0x1a
 	i -= len(m.Message)
 	copy(dAtA[i:], m.Message)
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Message)))
@@ -3345,6 +3352,8 @@ func (m *ValidationRule) Size() (n int) {
 	n += 1 + l + sovGenerated(uint64(l))
 	l = len(m.Message)
 	n += 1 + l + sovGenerated(uint64(l))
+	l = len(m.MessageExpression)
+	n += 1 + l + sovGenerated(uint64(l))
 	return n
 }
 
@@ -3811,6 +3820,7 @@ func (this *ValidationRule) String() string {
 	s := strings.Join([]string{`&ValidationRule{`,
 		`Rule:` + fmt.Sprintf("%v", this.Rule) + `,`,
 		`Message:` + fmt.Sprintf("%v", this.Message) + `,`,
+		`MessageExpression:` + fmt.Sprintf("%v", this.MessageExpression) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -9037,6 +9047,38 @@ func (m *ValidationRule) Unmarshal(dAtA []byte) error {
 			}
 			m.Message = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MessageExpression", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MessageExpression = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/generated.proto

@@ -717,6 +717,19 @@ message ValidationRule {
   // If unset, the message is "failed rule: {Rule}".
   // e.g. "must be a URL with the host matching spec.host"
   optional string message = 2;
+
+  // MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
+  // Since messageExpression is used as a failure message, it must evaluate to a string.
+  // If both message and messageExpression are present on a rule, then messageExpression will be used if validation
+  // fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced
+  // as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
+  // that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
+  // the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.
+  // messageExpression has access to all the same variables as the rule; the only difference is the return type.
+  // Example:
+  // "x must be less than max ("+string(self.max)+")"
+  // +optional
+  optional string messageExpression = 3;
 }
 
 // WebhookClientConfig contains the information to make a TLS connection with the webhook.

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/types_jsonschema.go

@@ -235,6 +235,18 @@ type ValidationRule struct {
 	// If unset, the message is "failed rule: {Rule}".
 	// e.g. "must be a URL with the host matching spec.host"
 	Message string `json:"message,omitempty" protobuf:"bytes,2,opt,name=message"`
+	// MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
+	// Since messageExpression is used as a failure message, it must evaluate to a string.
+	// If both message and messageExpression are present on a rule, then messageExpression will be used if validation
+	// fails. If messageExpression results in a runtime error, the runtime error is logged, and the validation failure message is produced
+	// as if the messageExpression field were unset. If messageExpression evaluates to an empty string, a string with only spaces, or a string
+	// that contains line breaks, then the validation failure message will also be produced as if the messageExpression field were unset, and
+	// the fact that messageExpression produced an empty string/string with only spaces/string with line breaks will be logged.
+	// messageExpression has access to all the same variables as the rule; the only difference is the return type.
+	// Example:
+	// "x must be less than max ("+string(self.max)+")"
+	// +optional
+	MessageExpression string `json:"messageExpression,omitempty" protobuf:"bytes,3,opt,name=messageExpression"`
 }
 
 // JSON represents any valid JSON value.

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/zz_generated.conversion.go

@@ -1306,6 +1306,7 @@ func Convert_apiextensions_ServiceReference_To_v1beta1_ServiceReference(in *apie
 func autoConvert_v1beta1_ValidationRule_To_apiextensions_ValidationRule(in *ValidationRule, out *apiextensions.ValidationRule, s conversion.Scope) error {
 	out.Rule = in.Rule
 	out.Message = in.Message
+	out.MessageExpression = in.MessageExpression
 	return nil
 }
 
@@ -1317,6 +1318,7 @@ func Convert_v1beta1_ValidationRule_To_apiextensions_ValidationRule(in *Validati
 func autoConvert_apiextensions_ValidationRule_To_v1beta1_ValidationRule(in *apiextensions.ValidationRule, out *ValidationRule, s conversion.Scope) error {
 	out.Rule = in.Rule
 	out.Message = in.Message
+	out.MessageExpression = in.MessageExpression
 	return nil
 }
 

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go

@@ -1005,6 +1005,7 @@ func ValidateCustomResourceDefinitionOpenAPISchema(schema *apiextensions.JSONSch
 		for i, rule := range schema.XValidations {
 			trimmedRule := strings.TrimSpace(rule.Rule)
 			trimmedMsg := strings.TrimSpace(rule.Message)
+			trimmedMsgExpr := strings.TrimSpace(rule.MessageExpression)
 			if len(trimmedRule) == 0 {
 				allErrs.SchemaErrors = append(allErrs.SchemaErrors, field.Required(fldPath.Child("x-kubernetes-validations").Index(i).Child("rule"), "rule is not specified"))
 			} else if len(rule.Message) > 0 && len(trimmedMsg) == 0 {
@@ -1014,6 +1015,9 @@ func ValidateCustomResourceDefinitionOpenAPISchema(schema *apiextensions.JSONSch
 			} else if hasNewlines(trimmedRule) && len(trimmedMsg) == 0 {
 				allErrs.SchemaErrors = append(allErrs.SchemaErrors, field.Required(fldPath.Child("x-kubernetes-validations").Index(i).Child("message"), "message must be specified if rule contains line breaks"))
 			}
+			if len(rule.MessageExpression) > 0 && len(trimmedMsgExpr) == 0 {
+				allErrs.SchemaErrors = append(allErrs.SchemaErrors, field.Required(fldPath.Child("x-kubernetes-validations").Index(i).Child("messageExpression"), "messageExpression must be non-empty if specified"))
+			}
 		}
 
 		// If any schema related validation errors have been found at this level or deeper, skip CEL expression validation.
@@ -1047,6 +1051,19 @@ func ValidateCustomResourceDefinitionOpenAPISchema(schema *apiextensions.JSONSch
 								allErrs.CELErrors = append(allErrs.CELErrors, field.Invalid(fldPath.Child("x-kubernetes-validations").Index(i).Child("rule"), schema.XValidations[i], cr.Error.Detail))
 							}
 						}
+						if cr.MessageExpressionError != nil {
+							allErrs.CELErrors = append(allErrs.CELErrors, field.Invalid(fldPath.Child("x-kubernetes-validations").Index(i).Child("messageExpression"), schema.XValidations[i], cr.MessageExpressionError.Detail))
+						} else {
+							if cr.MessageExpression != nil {
+								if cr.MessageExpressionMaxCost > StaticEstimatedCostLimit {
+									costErrorMsg := getCostErrorMessage("estimated messageExpression cost", cr.MessageExpressionMaxCost, StaticEstimatedCostLimit)
+									allErrs.CELErrors = append(allErrs.CELErrors, field.Forbidden(fldPath.Child("x-kubernetes-validations").Index(i).Child("messageExpression"), costErrorMsg))
+								}
+								if celContext.TotalCost != nil {
+									celContext.TotalCost.ObserveExpressionCost(fldPath.Child("x-kubernetes-validations").Index(i).Child("messageExpression"), cr.MessageExpressionMaxCost)
+								}
+							}
+						}
 						if cr.TransitionRule {
 							if uncorrelatablePath := ssv.forbidOldSelfValidations(); uncorrelatablePath != nil {
 								allErrs.CELErrors = append(allErrs.CELErrors, field.Invalid(fldPath.Child("x-kubernetes-validations").Index(i).Child("rule"), schema.XValidations[i].Rule, fmt.Sprintf("oldSelf cannot be used on the uncorrelatable portion of the schema within %v", uncorrelatablePath)))

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation_test.go

@@ -8558,6 +8558,180 @@ func TestValidateCustomResourceDefinitionValidation(t *testing.T) {
 				invalid("spec.validation.openAPIV3Schema.properties[f@2].x-kubernetes-validations[0].rule"),
 			},
 		},
+		{
+			name: "x-kubernetes-validations rule with messageExpression",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "string",
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "self == \"string value\"",
+									MessageExpression: `self + " should be \"string value\""`,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{},
+		},
+		{
+			name: "x-kubernetes-validations rule allows both message and messageExpression",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "string",
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "self == \"string value\"",
+									Message:           `string should be set to "string value"`,
+									MessageExpression: `self + " should be \"string value\""`,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{},
+		},
+		{
+			name: "x-kubernetes-validations rule invalidated by messageExpression syntax error",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "string",
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "self == \"string value\"",
+									MessageExpression: `self + " `,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{
+				invalid("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+			},
+		},
+		{
+			name: "x-kubernetes-validations rule invalidated by messageExpression not returning a string",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "string",
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "self == \"string value\"",
+									MessageExpression: `256`,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{
+				invalid("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+			},
+		},
+		{
+			name: "x-kubernetes-validations rule invalidated by messageExpression exceeding per-expression estimated cost limit",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "array",
+							Items: &apiextensions.JSONSchemaPropsOrArray{
+								Schema: &apiextensions.JSONSchemaProps{
+									Type: "string",
+								},
+							},
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "true",
+									MessageExpression: `self[0] + self[1] + self[2] + self[3] + self[4] + self[5] + self[6] + self[7]`,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{
+				// forbidden due to messageExpression exceeding per-expression cost limit
+				forbidden("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+			},
+		},
+		{
+			name: "x-kubernetes-validations rule invalidated by messageExpression exceeding per-CRD estimated cost limit",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "array",
+							Items: &apiextensions.JSONSchemaPropsOrArray{
+								Schema: &apiextensions.JSONSchemaProps{
+									Type: "string",
+								},
+							},
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "true",
+									MessageExpression: `string(self[0]) + string(self[1]) + string(self[2])`,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{
+				// forbidden due to per-CRD cost limit being exceeded
+				forbidden("spec.validation.openAPIV3Schema"),
+				// forbidden due to messageExpression exceeding per-expression cost limit
+				forbidden("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+				// additional message indicated messageExpression's contribution to exceeding the per-CRD cost limit
+				forbidden("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+			},
+		},
+		{
+			name: "x-kubernetes-validations rule invalidated by messageExpression being only empty spaces",
+			opts: validationOptions{requireStructuralSchema: true},
+			input: apiextensions.CustomResourceValidation{
+				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
+					Type: "object",
+					Properties: map[string]apiextensions.JSONSchemaProps{
+						"f": {
+							Type: "string",
+							XValidations: apiextensions.ValidationRules{
+								{
+									Rule:              "self == \"string value\"",
+									MessageExpression: `     `,
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedErrors: []validationMatch{
+				required("spec.validation.openAPIV3Schema.properties[f].x-kubernetes-validations[0].messageExpression"),
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/testdata/HEAD/apiextensions.k8s.io.v1.CustomResourceDefinition.json

@@ -139,7 +139,8 @@
             "x-kubernetes-validations": [
               {
                 "rule": "ruleValue",
-                "message": "messageValue"
+                "message": "messageValue",
+                "messageExpression": "messageExpressionValue"
               }
             ]
           }

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/testdata/HEAD/apiextensions.k8s.io.v1.CustomResourceDefinition.yaml

@@ -129,6 +129,7 @@ spec:
         x-kubernetes-preserve-unknown-fields: true
         x-kubernetes-validations:
         - message: messageValue
+          messageExpression: messageExpressionValue
           rule: ruleValue
     served: true
     storage: true

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/testdata/HEAD/apiextensions.k8s.io.v1beta1.CustomResourceDefinition.json

@@ -133,7 +133,8 @@
         "x-kubernetes-validations": [
           {
             "rule": "ruleValue",
-            "message": "messageValue"
+            "message": "messageValue",
+            "messageExpression": "messageExpressionValue"
           }
         ]
       }
@@ -227,7 +228,8 @@
             "x-kubernetes-validations": [
               {
                 "rule": "ruleValue",
-                "message": "messageValue"
+                "message": "messageValue",
+                "messageExpression": "messageExpressionValue"
               }
             ]
           }

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/testdata/HEAD/apiextensions.k8s.io.v1beta1.CustomResourceDefinition.yaml

@@ -130,6 +130,7 @@ spec:
       x-kubernetes-preserve-unknown-fields: true
       x-kubernetes-validations:
       - message: messageValue
+        messageExpression: messageExpressionValue
         rule: ruleValue
   version: versionValue
   versions:
@@ -203,6 +204,7 @@ spec:
         x-kubernetes-preserve-unknown-fields: true
         x-kubernetes-validations:
         - message: messageValue
+          messageExpression: messageExpressionValue
           rule: ruleValue
     served: true
     storage: true

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/schema/cel/compilation.go

@@ -55,6 +55,15 @@ type CompilationResult struct {
 	// MaxCardinality represents the worse case number of times this validation rule could be invoked if contained under an
 	// unbounded map or list in an OpenAPIv3 schema.
 	MaxCardinality uint64
+	// MessageExpression represents the cel Program that should be evaluated to generate an error message if the rule
+	// fails to validate. If no MessageExpression was given, or if this expression failed to compile, this will be nil.
+	MessageExpression cel.Program
+	// MessageExpressionError represents an error encountered during compilation of MessageExpression. If no error was
+	// encountered, this will be nil.
+	MessageExpressionError *apiservercel.Error
+	// MessageExpressionMaxCost represents the worst-case cost of the compiled MessageExpression in terms of CEL's cost units,
+	// as used by cel.EstimateCost.
+	MessageExpressionMaxCost uint64
 }
 
 var (
@@ -194,6 +203,42 @@ func compileRule(rule apiextensions.ValidationRule, env *cel.Env, perCallLimit u
 	compilationResult.MaxCost = costEst.Max
 	compilationResult.MaxCardinality = maxCardinality
 	compilationResult.Program = prog
+	if rule.MessageExpression != "" {
+		ast, issues := env.Compile(rule.MessageExpression)
+		if issues != nil {
+			compilationResult.MessageExpressionError = &apiservercel.Error{Type: apiservercel.ErrorTypeInvalid, Detail: "messageExpression compilation failed: " + issues.String()}
+			return
+		}
+		if ast.OutputType() != cel.StringType {
+			compilationResult.MessageExpressionError = &apiservercel.Error{Type: apiservercel.ErrorTypeInvalid, Detail: "messageExpression must evaluate to a string"}
+			return
+		}
+
+		_, err := cel.AstToCheckedExpr(ast)
+		if err != nil {
+			compilationResult.MessageExpressionError = &apiservercel.Error{Type: apiservercel.ErrorTypeInternal, Detail: "unexpected messageExpression compilation error: " + err.Error()}
+			return
+		}
+
+		msgProg, err := env.Program(ast,
+			cel.EvalOptions(cel.OptOptimize, cel.OptTrackCost),
+			cel.CostLimit(perCallLimit),
+			cel.CostTracking(estimator),
+			cel.OptimizeRegex(library.ExtensionLibRegexOptimizations...),
+			cel.InterruptCheckFrequency(celconfig.CheckFrequency),
+		)
+		if err != nil {
+			compilationResult.MessageExpressionError = &apiservercel.Error{Type: apiservercel.ErrorTypeInvalid, Detail: "messageExpression instantiation failed: " + err.Error()}
+			return
+		}
+		costEst, err := env.EstimateCost(ast, estimator)
+		if err != nil {
+			compilationResult.MessageExpressionError = &apiservercel.Error{Type: apiservercel.ErrorTypeInternal, Detail: "cost estimation failed for messageExpression: " + err.Error()}
+			return
+		}
+		compilationResult.MessageExpression = msgProg
+		compilationResult.MessageExpressionMaxCost = costEst.Max
+	}
 	return
 }
 

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/schema/cel/compilation_test.go

@@ -98,6 +98,22 @@ func (v errorMatcher) String() string {
 	return fmt.Sprintf("has error of type %q containing string %q", v.errorType, v.contains)
 }
 
+type messageExpressionErrorMatcher struct {
+	contains string
+}
+
+func messageExpressionError(contains string) validationMatcher {
+	return messageExpressionErrorMatcher{contains: contains}
+}
+
+func (m messageExpressionErrorMatcher) matches(cr CompilationResult) bool {
+	return cr.MessageExpressionError != nil && cr.MessageExpressionError.Type == cel.ErrorTypeInvalid && strings.Contains(cr.MessageExpressionError.Error(), m.contains)
+}
+
+func (m messageExpressionErrorMatcher) String() string {
+	return fmt.Sprintf("has messageExpression error containing string %q", m.contains)
+}
+
 type noErrorMatcher struct{}
 
 func noError() validationMatcher {
@@ -642,6 +658,63 @@ func TestCelCompilation(t *testing.T) {
 				invalidError("must evaluate to a bool"),
 			},
 		},
+		{
+			name: "messageExpression inclusion",
+			input: schema.Structural{
+				Generic: schema.Generic{
+					Type: "string",
+				},
+				Extensions: schema.Extensions{
+					XValidations: apiextensions.ValidationRules{
+						{
+							Rule:              "self.startsWith('s')",
+							MessageExpression: `"scoped field should start with 's'"`,
+						},
+					},
+				},
+			},
+			expectedResults: []validationMatcher{
+				noError(),
+			},
+		},
+		{
+			name: "messageExpression must evaluate to a string",
+			input: schema.Structural{
+				Generic: schema.Generic{
+					Type: "integer",
+				},
+				Extensions: schema.Extensions{
+					XValidations: apiextensions.ValidationRules{
+						{
+							Rule:              "self == 5",
+							MessageExpression: `42`,
+						},
+					},
+				},
+			},
+			expectedResults: []validationMatcher{
+				messageExpressionError("must evaluate to a string"),
+			},
+		},
+		{
+			name: "messageExpression syntax error",
+			input: schema.Structural{
+				Generic: schema.Generic{
+					Type: "number",
+				},
+				Extensions: schema.Extensions{
+					XValidations: apiextensions.ValidationRules{
+						{
+							Rule:              "self < 32.0",
+							MessageExpression: `"abc`,
+						},
+					},
+				},
+			},
+			expectedResults: []validationMatcher{
+				messageExpressionError("messageExpression compilation failed"),
+			},
+		},
 	}
 
 	for _, tt := range cases {

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/schema/cel/validation.go

@@ -21,9 +21,11 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+	"regexp"
 	"strings"
 	"time"
 
+	celgo "github.com/google/cel-go/cel"
 	"github.com/google/cel-go/common/types"
 	"github.com/google/cel-go/common/types/ref"
 	"github.com/google/cel-go/interpreter"
@@ -34,6 +36,9 @@ import (
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/apiserver/pkg/cel"
 	"k8s.io/apiserver/pkg/cel/metrics"
+	"k8s.io/klog/v2"
+
+	celconfig "k8s.io/apiserver/pkg/apis/cel"
 )
 
 // Validator parallels the structure of schema.Structural and includes the compiled CEL programs
@@ -252,16 +257,102 @@ func (s *Validator) validateExpressions(ctx context.Context, fldPath *field.Path
 			continue
 		}
 		if evalResult != types.True {
-			if len(rule.Message) != 0 {
+			if compiled.MessageExpression != nil {
-				errs = append(errs, field.Invalid(fldPath, sts.Type, rule.Message))
+				messageExpression, newRemainingBudget, msgErr := evalMessageExpression(ctx, compiled.MessageExpression, rule.MessageExpression, activation, remainingBudget)
+				if msgErr != nil {
+					if msgErr.Type == cel.ErrorTypeInternal {
+						errs = append(errs, field.InternalError(fldPath, msgErr))
+						return errs, -1
+					} else if msgErr.Type == cel.ErrorTypeInvalid {
+						errs = append(errs, field.Invalid(fldPath, sts.Type, msgErr.Error()))
+						return errs, -1
+					} else {
+						klog.V(2).ErrorS(msgErr, "messageExpression evaluation failed")
+						errs = append(errs, field.Invalid(fldPath, sts.Type, ruleMessageOrDefault(rule)))
+						remainingBudget = newRemainingBudget
+					}
+				} else {
+					errs = append(errs, field.Invalid(fldPath, sts.Type, messageExpression))
+					remainingBudget = newRemainingBudget
+				}
 			} else {
-				errs = append(errs, field.Invalid(fldPath, sts.Type, fmt.Sprintf("failed rule: %s", ruleErrorString(rule))))
+				errs = append(errs, field.Invalid(fldPath, sts.Type, ruleMessageOrDefault(rule)))
 			}
 		}
 	}
 	return errs, remainingBudget
 }
 
+// evalMessageExpression evaluates the given message expression and returns the evaluated string form and the remaining budget, or an error if one
+// occurred during evaluation.
+func evalMessageExpression(ctx context.Context, expr celgo.Program, exprSrc string, activation interpreter.Activation, remainingBudget int64) (string, int64, *cel.Error) {
+	evalResult, evalDetails, err := expr.ContextEval(ctx, activation)
+	if evalDetails == nil {
+		return "", -1, &cel.Error{
+			Type:   cel.ErrorTypeInternal,
+			Detail: fmt.Sprintf("runtime cost could not be calculated for messageExpression: %q", exprSrc),
+		}
+	}
+	rtCost := evalDetails.ActualCost()
+	if rtCost == nil {
+		return "", -1, &cel.Error{
+			Type:   cel.ErrorTypeInternal,
+			Detail: fmt.Sprintf("runtime cost could not be calculated for messageExpression: %q", exprSrc),
+		}
+	} else if *rtCost > math.MaxInt64 || int64(*rtCost) > remainingBudget {
+		return "", -1, &cel.Error{
+			Type:   cel.ErrorTypeInvalid,
+			Detail: "messageExpression evaluation failed due to running out of cost budget, no further validation rules will be run",
+		}
+	}
+	if err != nil {
+		if strings.HasPrefix(err.Error(), "operation cancelled: actual cost limit exceeded") {
+			return "", -1, &cel.Error{
+				Type:   cel.ErrorTypeInvalid,
+				Detail: fmt.Sprintf("no further validation rules will be run due to call cost exceeds limit for messageExpression: %q", exprSrc),
+			}
+		}
+		return "", remainingBudget - int64(*rtCost), &cel.Error{
+			Detail: fmt.Sprintf("messageExpression evaluation failed due to: %v", err.Error()),
+		}
+	}
+	messageStr, ok := evalResult.Value().(string)
+	if !ok {
+		return "", remainingBudget - int64(*rtCost), &cel.Error{
+			Detail: "messageExpression failed to convert to string",
+		}
+	}
+	trimmedMsgStr := strings.TrimSpace(messageStr)
+	if len(trimmedMsgStr) > celconfig.MaxEvaluatedMessageExpressionSizeBytes {
+		return "", remainingBudget - int64(*rtCost), &cel.Error{
+			Detail: fmt.Sprintf("messageExpression beyond allowable length of %d", celconfig.MaxEvaluatedMessageExpressionSizeBytes),
+		}
+	} else if hasNewlines(trimmedMsgStr) {
+		return "", remainingBudget - int64(*rtCost), &cel.Error{
+			Detail: "messageExpression should not contain line breaks",
+		}
+	} else if len(trimmedMsgStr) == 0 {
+		return "", remainingBudget - int64(*rtCost), &cel.Error{
+			Detail: "messageExpression should evaluate to a non-empty string",
+		}
+	}
+	return trimmedMsgStr, remainingBudget - int64(*rtCost), nil
+}
+
+var newlineMatcher = regexp.MustCompile(`[\n]+`)
+
+func hasNewlines(s string) bool {
+	return newlineMatcher.MatchString(s)
+}
+
+func ruleMessageOrDefault(rule apiextensions.ValidationRule) string {
+	if len(rule.Message) == 0 {
+		return fmt.Sprintf("failed rule: %s", ruleErrorString(rule))
+	} else {
+		return strings.TrimSpace(rule.Message)
+	}
+}
+
 func ruleErrorString(rule apiextensions.ValidationRule) string {
 	if len(rule.Message) > 0 {
 		return strings.TrimSpace(rule.Message)

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/schema/cel/validation_test.go

@@ -18,12 +18,14 @@ package cel
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"math"
 	"strings"
 	"testing"
 	"time"
 
+	"k8s.io/klog/v2"
 	"k8s.io/kube-openapi/pkg/validation/strfmt"
 
 	apiextensions "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
@@ -2260,6 +2262,186 @@ func TestCELMaxRecursionDepth(t *testing.T) {
 	}
 }
 
+func TestMessageExpression(t *testing.T) {
+	klog.LogToStderr(false)
+	klog.InitFlags(nil)
+	setDefaultVerbosity(2)
+	defer klog.LogToStderr(true)
+	tests := []struct {
+		name                    string
+		costBudget              int64
+		perCallLimit            uint64
+		message                 string
+		messageExpression       string
+		expectedLogErr          string
+		expectedValidationErr   string
+		expectedRemainingBudget int64
+	}{
+		{
+			name:                    "no cost error expected",
+			messageExpression:       `"static string"`,
+			expectedValidationErr:   "static string",
+			costBudget:              300,
+			expectedRemainingBudget: 300,
+		},
+		{
+			name:                  "messageExpression takes precedence over message",
+			message:               "invisible",
+			messageExpression:     `"this is messageExpression"`,
+			costBudget:            celconfig.RuntimeCELCostBudget,
+			expectedValidationErr: "this is messageExpression",
+		},
+		{
+			name:                    "default rule message used if messageExpression does not eval to string",
+			messageExpression:       `true`,
+			costBudget:              celconfig.RuntimeCELCostBudget,
+			expectedValidationErr:   "failed rule",
+			expectedRemainingBudget: celconfig.RuntimeCELCostBudget,
+		},
+		{
+			name:                    "limit exceeded",
+			messageExpression:       `"string 1" + "string 2" + "string 3"`,
+			costBudget:              1,
+			expectedValidationErr:   "messageExpression evaluation failed due to running out of cost budget",
+			expectedRemainingBudget: -1,
+		},
+		{
+			name:                    "messageExpression budget (str concat)",
+			messageExpression:       `"str1 " + self.str`,
+			costBudget:              50,
+			expectedValidationErr:   "str1 a string",
+			expectedRemainingBudget: 46,
+		},
+		{
+			name:                    "runtime cost preserved if messageExpression fails during evaluation",
+			message:                 "message not messageExpression",
+			messageExpression:       `"str1 " + ["a", "b", "c", "d"][4]`,
+			costBudget:              50,
+			expectedLogErr:          "messageExpression evaluation failed due to: index '4' out of range in list size '4'",
+			expectedValidationErr:   "message not messageExpression",
+			expectedRemainingBudget: 47,
+		},
+		{
+			name:                    "runtime cost preserved if messageExpression fails during evaluation (no message set)",
+			messageExpression:       `"str1 " + ["a", "b", "c", "d"][4]`,
+			costBudget:              50,
+			expectedLogErr:          "messageExpression evaluation failed due to: index '4' out of range in list size '4'",
+			expectedValidationErr:   "failed rule",
+			expectedRemainingBudget: 47,
+		},
+		{
+			name:                    "per-call limit exceeded during messageExpression execution",
+			messageExpression:       `"string 1" + "string 2" + "string 3"`,
+			costBudget:              celconfig.RuntimeCELCostBudget,
+			perCallLimit:            1,
+			expectedValidationErr:   "call cost exceeds limit for messageExpression",
+			expectedRemainingBudget: -1,
+		},
+		{
+			name:                  "messageExpression is not allowed to generate a string with newlines",
+			message:               "message not messageExpression",
+			messageExpression:     `"str with \na newline"`,
+			costBudget:            celconfig.RuntimeCELCostBudget,
+			expectedLogErr:        "messageExpression should not contain line breaks",
+			expectedValidationErr: "message not messageExpression",
+		},
+		{
+			name:                  "messageExpression is not allowed to generate messages >5000 characters",
+			message:               "message not messageExpression",
+			messageExpression:     fmt.Sprintf(`"%s"`, genString(5121, 'a')),
+			costBudget:            celconfig.RuntimeCELCostBudget,
+			expectedLogErr:        "messageExpression beyond allowable length of 5120",
+			expectedValidationErr: "message not messageExpression",
+		},
+		{
+			name:                  "messageExpression is not allowed to generate an empty string",
+			message:               "message not messageExpression",
+			messageExpression:     `string("")`,
+			costBudget:            celconfig.RuntimeCELCostBudget,
+			expectedLogErr:        "messageExpression should evaluate to a non-empty string",
+			expectedValidationErr: "message not messageExpression",
+		},
+		{
+			name:                  "messageExpression is not allowed to generate a string with only spaces",
+			message:               "message not messageExpression",
+			messageExpression:     `string("     ")`,
+			costBudget:            celconfig.RuntimeCELCostBudget,
+			expectedLogErr:        "messageExpression should evaluate to a non-empty string",
+			expectedValidationErr: "message not messageExpression",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			outputBuffer := strings.Builder{}
+			klog.SetOutput(&outputBuffer)
+
+			ctx := context.TODO()
+			var s schema.Structural
+			if tt.message != "" {
+				s = withRuleMessageAndMessageExpression(objectType(map[string]schema.Structural{
+					"str": stringType}), "false", tt.message, tt.messageExpression)
+			} else {
+				s = withRuleAndMessageExpression(objectType(map[string]schema.Structural{
+					"str": stringType}), "false", tt.messageExpression)
+			}
+			obj := map[string]interface{}{
+				"str": "a string",
+			}
+
+			callLimit := uint64(celconfig.PerCallLimit)
+			if tt.perCallLimit != 0 {
+				callLimit = tt.perCallLimit
+			}
+			celValidator := NewValidator(&s, false, callLimit)
+			if celValidator == nil {
+				t.Fatal("expected non nil validator")
+			}
+			errs, remainingBudget := celValidator.Validate(ctx, field.NewPath("root"), &s, obj, nil, tt.costBudget)
+			klog.Flush()
+
+			if len(errs) != 1 {
+				t.Fatalf("expected 1 error, got %d", len(errs))
+			}
+
+			if tt.expectedLogErr != "" {
+				if !strings.Contains(outputBuffer.String(), tt.expectedLogErr) {
+					t.Fatalf("did not find expected log error message: %q\n%q", tt.expectedLogErr, outputBuffer.String())
+				}
+			} else if tt.expectedLogErr == "" && outputBuffer.String() != "" {
+				t.Fatalf("expected no log output, got: %q", outputBuffer.String())
+			}
+
+			if tt.expectedValidationErr != "" {
+				if !strings.Contains(errs[0].Error(), tt.expectedValidationErr) {
+					t.Fatalf("did not find expected validation error message: %q", tt.expectedValidationErr)
+				}
+			}
+
+			if tt.expectedRemainingBudget != 0 {
+				if tt.expectedRemainingBudget != remainingBudget {
+					t.Fatalf("expected %d cost left, got %d", tt.expectedRemainingBudget, remainingBudget)
+				}
+			}
+		})
+	}
+}
+
+func genString(n int, c rune) string {
+	b := strings.Builder{}
+	for i := 0; i < n; i++ {
+		_, err := b.WriteRune(c)
+		if err != nil {
+			panic(err)
+		}
+	}
+	return b.String()
+}
+
+func setDefaultVerbosity(v int) {
+	f := flag.CommandLine.Lookup("v")
+	_ = f.Value.Set(fmt.Sprintf("%d", v))
+}
+
 func BenchmarkCELValidationWithContext(b *testing.B) {
 	items := make([]interface{}, 1000)
 	for i := int64(0); i < 1000; i++ {
@@ -2534,6 +2716,27 @@ func withRule(s schema.Structural, rule string) schema.Structural {
 	return s
 }
 
+func withRuleMessageAndMessageExpression(s schema.Structural, rule, message, messageExpression string) schema.Structural {
+	s.Extensions.XValidations = apiextensions.ValidationRules{
+		{
+			Rule:              rule,
+			Message:           message,
+			MessageExpression: messageExpression,
+		},
+	}
+	return s
+}
+
+func withRuleAndMessageExpression(s schema.Structural, rule, messageExpression string) schema.Structural {
+	s.Extensions.XValidations = apiextensions.ValidationRules{
+		{
+			Rule:              rule,
+			MessageExpression: messageExpression,
+		},
+	}
+	return s
+}
+
 func withRulePtr(s *schema.Structural, rule string) *schema.Structural {
 	s.Extensions.XValidations = apiextensions.ValidationRules{
 		{

staging/src/k8s.io/apiserver/pkg/apis/cel/config.go

@@ -33,4 +33,8 @@ const (
 	// TODO(DangerOnTheRanger): wire in MaxRequestBodyBytes from apiserver/pkg/server/options/server_run_options.go to make this configurable
 	// Note that even if server_run_options.go becomes configurable in the future, this cost constant should be fixed and it should be the max allowed request size for the server
 	MaxRequestSizeBytes = int64(3 * 1024 * 1024)
+
+	// MaxEvaluatedMessageExpressionSizeBytes represents the largest-allowable string generated
+	// by a messageExpression field
+	MaxEvaluatedMessageExpressionSizeBytes = 5 * 1024
 )

test/integration/apiserver/crd_validation_expressions_test.go

@@ -523,8 +523,8 @@ func TestCustomResourceValidatorsWithBlockingErrors(t *testing.T) {
 			if err == nil {
 				t.Fatal("Expected create of invalid custom resource to fail")
 			} else {
-				if !strings.Contains(err.Error(), "failed rule: self.spec.x + self.spec.y") {
+				if !strings.Contains(err.Error(), "self.spec.x + self.spec.y must be greater than or equal to 0") {
-					t.Fatalf("Expected error to contain %s but got %v", "failed rule: self.spec.x + self.spec.y", err.Error())
+					t.Fatalf("Expected error to contain %s but got %v", "self.spec.x + self.spec.y must be greater than or equal to 0", err.Error())
 				}
 			}
 		})
@@ -837,7 +837,8 @@ var structuralSchemaWithBlockingErr = []byte(`
     "type": "object",
 	"x-kubernetes-validations": [
 	  {
-		"rule": "self.spec.x + self.spec.y >= (has(self.status) ? self.status.z : 0)"
+		"rule": "self.spec.x + self.spec.y >= (has(self.status) ? self.status.z : 0)",
+		"messageExpression": "\"self.spec.x + self.spec.y must be greater than or equal to 0\""
 	  }
 	],
     "properties": {