53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
/*
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Copyright 2025 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package validate
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import (
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"context"
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"k8s.io/apimachinery/pkg/api/operation"
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"k8s.io/apimachinery/pkg/util/validation/field"
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)
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// GetFieldFunc is a function that extracts a field from a type and returns a
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// nilable value.
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type GetFieldFunc[Tstruct any, Tfield any] func(*Tstruct) Tfield
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// Subfield validates a subfield of a struct against a validator function. If
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// the value of the subfield is the same as the previous value, as per the
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// equiv function, then no validation is performed.
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//
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// The fldPath passed to the validator includes the subfield name.
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func Subfield[Tstruct any, Tfield any](
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ctx context.Context, op operation.Operation, fldPath *field.Path,
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newStruct, oldStruct *Tstruct,
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fldName string, getField GetFieldFunc[Tstruct, Tfield],
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equiv MatchFunc[Tfield],
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validator ValidateFunc[Tfield],
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) field.ErrorList {
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var errs field.ErrorList
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newVal := getField(newStruct)
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var oldVal Tfield
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if oldStruct != nil {
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oldVal = getField(oldStruct)
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}
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if op.Type == operation.Update && oldStruct != nil && equiv(newVal, oldVal) {
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return nil
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}
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errs = append(errs, validator(ctx, op, fldPath.Child(fldName), newVal, oldVal)...)
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return errs
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}
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