69 lines
2.2 KiB
Go
69 lines
2.2 KiB
Go
/*
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Copyright 2022 The Karmada 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 helper
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import (
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"encoding/json"
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"fmt"
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jsonpatch "github.com/evanphx/json-patch/v5"
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)
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// GenMergePatch will return a merge patch document capable of converting the
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// original object to the modified object.
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// The merge patch format is primarily intended for use with the HTTP PATCH method
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// as a means of describing a set of modifications to a target resource's content.
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func GenMergePatch(originalObj interface{}, modifiedObj interface{}) ([]byte, error) {
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originalBytes, err := json.Marshal(originalObj)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal original object: %w", err)
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}
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modifiedBytes, err := json.Marshal(modifiedObj)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal modified object: %w", err)
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}
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patchBytes, err := jsonpatch.CreateMergePatch(originalBytes, modifiedBytes)
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if err != nil {
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return nil, fmt.Errorf("failed to create a merge patch: %w", err)
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}
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// It's unnecessary to patch.
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if string(patchBytes) == "{}" {
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return nil, nil
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}
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return patchBytes, nil
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}
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// GenFieldMergePatch will return a merge patch document capable of converting the
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// original field to the modified field.
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// The merge patch format is primarily intended for use with the HTTP PATCH method
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// as a means of describing a set of modifications to a target resource's content.
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func GenFieldMergePatch(fieldName string, originField interface{}, modifiedField interface{}) ([]byte, error) {
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patchBytes, err := GenMergePatch(originField, modifiedField)
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if err != nil {
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return nil, err
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}
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if len(patchBytes) == 0 {
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return nil, nil
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}
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patchBytes = append(patchBytes, '}')
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patchBytes = append([]byte(`{"`+fieldName+`":`), patchBytes...)
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return patchBytes, nil
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}
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