ImageValidatingPolicyList (policies.kyverno.io/v1beta1)

key specifies the audit annotation key. The audit annotation keys of
a ValidatingAdmissionPolicy must be unique. The key must be a qualified
name ([A-Za-z0-9][-A-Za-z0-9_.]*) no more than 63 bytes in length.

The key is combined with the resource name of the
ValidatingAdmissionPolicy to construct an audit annotation key:
"{ValidatingAdmissionPolicy name}/{key}".

If an admission webhook uses the same resource name as this ValidatingAdmissionPolicy
and the same audit annotation key, the annotation key will be identical.
In this case, the first annotation written with the key will be included
in the audit event and all subsequent annotations with the same key
will be discarded.

Required.

valueExpression represents the expression which is evaluated by CEL to
produce an audit annotation value. The expression must evaluate to either
a string or null value. If the expression evaluates to a string, the
audit annotation is included with the string value. If the expression
evaluates to null or empty string the audit annotation will be omitted.
The valueExpression may be no longer than 5kb in length.
If the result of the valueExpression is more than 10kb in length, it
will be truncated to 10kb.

If multiple ValidatingAdmissionPolicyBinding resources match an
API request, then the valueExpression will be evaluated for
each binding. All unique values produced by the valueExpressions
will be joined together in a comma-separated list.

Required.

Expression represents the expression which will be evaluated by CEL. Must evaluate to bool.
CEL expressions have access to the contents of the AdmissionRequest and Authorizer, organized into CEL variables:

'object' - The object from the incoming request. The value is null for DELETE requests.
'oldObject' - The existing object. The value is null for CREATE requests.
'request' - Attributes of the admission request(/pkg/apis/admission/types.go#AdmissionRequest).
'authorizer' - A CEL Authorizer. May be used to perform authorization checks for the principal (user or service account) of the request.
See https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#Authz
'authorizer.requestResource' - A CEL ResourceCheck constructed from the 'authorizer' and configured with the
request resource.
Documentation on CEL: https://kubernetes.io/docs/reference/using-api/cel/

Required.

Name is an identifier for this match condition, used for strategic merging of MatchConditions,
as well as providing an identifier for logging purposes. A good name should be descriptive of
the associated expression.
Name must be a qualified name consisting of alphanumeric characters, '-', '' or '.', and
must start and end with an alphanumeric character (e.g. 'MyName', or 'my.name', or
'123-abc', regex used for validation is '([A-Za-z0-9][-A-Za-z0-9.]*)?[A-Za-z0-9]') with an
optional DNS subdomain prefix and '/' (e.g. 'example.com/MyName')

Required.

Expression represents the expression which will be evaluated by CEL.
ref: https://github.com/google/cel-spec
CEL expressions have access to the contents of the API request/response, organized into CEL variables as well as some other useful variables:

• 'object' - The object from the incoming request. The value is null for DELETE requests.
• 'oldObject' - The existing object. The value is null for CREATE requests.
• 'request' - Attributes of the API request(ref).
• 'params' - Parameter resource referred to by the policy binding being evaluated. Only populated if the policy has a ParamKind.
• 'namespaceObject' - The namespace object that the incoming object belongs to. The value is null for cluster-scoped resources.
• 'variables' - Map of composited variables, from its name to its lazily evaluated value.
  For example, a variable named 'foo' can be accessed as 'variables.foo'.
• 'authorizer' - A CEL Authorizer. May be used to perform authorization checks for the principal (user or service account) of the request.
  See https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#Authz
• 'authorizer.requestResource' - A CEL ResourceCheck constructed from the 'authorizer' and configured with the
  request resource.

The apiVersion, kind, metadata.name and metadata.generateName are always accessible from the root of the
object. No other metadata properties are accessible.

Only 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:
"true", "false", "null", "in", "as", "break", "const", "continue", "else", "for", "function", "if",
"import", "let", "loop", "package", "namespace", "return".
Examples:
- Expression accessing a property named "namespace": {"Expression": "object.namespace > 0"}
- Expression accessing a property named "x-prop": {"Expression": "object.xdashprop > 0"}
- Expression accessing a property named "redactd": {"Expression": "object.redactunderscoresd > 0"}

Equality on arrays with 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:
- 'set': X + Y performs a union where the array positions of all elements in X are preserved and
non-intersecting elements in Y are appended, retaining their partial order.
- 'map': X + Y performs a merge where the array positions of all keys in X are preserved but the values
are overwritten by values in Y when the key sets of X and Y intersect. Elements in Y with
non-intersecting keys are appended, retaining their partial order.
Required.

Message represents the message displayed when validation fails. The message is required if the Expression 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"
If the Expression contains line breaks. Message is required.
The message must not contain line breaks.
If unset, the message is "failed Expression: {Expression}".

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 validation, 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 expression except for 'authorizer' and 'authorizer.requestResource'.
Example:
"object.x must be less than max ("+string(params.max)+")"

Reason represents a machine-readable description of why this validation failed.
If this is the first validation in the list to fail, this reason, as well as the
corresponding HTTP response code, are used in the
HTTP response to the client.
The currently supported reasons are: "Unauthorized", "Forbidden", "Invalid", "RequestEntityTooLarge".
If not set, StatusReasonInvalid is used in the response to the client.