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yamlprocessor.go
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yamlprocessor.go
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// Copyright 2020 The PipeCD Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package yamlprocessor
import (
"bytes"
"fmt"
"io"
goyaml "github.com/goccy/go-yaml"
"github.com/goccy/go-yaml/ast"
"github.com/goccy/go-yaml/parser"
)
// GetValue gives back the value placed at a given path. The type of
// returned value can be string, int64, uint64, float64, bool, and []interface{}.
//
// The path requires to start with "$" which represents the root element.
// Available operators are:
// $ : the root object/element
// . : child operator
// .. : recursive descent
// [num] : object/element of array by number
// [*] : all objects/elements for array.
//
// e.g. "$.foo.bar[0].baz"
func GetValue(yml []byte, path string) (interface{}, error) {
if len(yml) == 0 {
return nil, fmt.Errorf("empty yaml given")
}
if path == "" {
return nil, fmt.Errorf("no path given")
}
p, err := goyaml.PathString(path)
if err != nil {
return nil, err
}
var value interface{}
if err := p.Read(bytes.NewReader(yml), &value); err != nil {
return nil, err
}
return value, nil
}
// ReplaceValue replaces the value placed at a given path with
// a given value, and then gives back the new yaml bytes.
//
// For available operators for the path, see GetValue().
func ReplaceValue(yml []byte, path string, value string) ([]byte, error) {
if len(yml) == 0 {
return nil, fmt.Errorf("empty yaml given")
}
if path == "" {
return nil, fmt.Errorf("no path given")
}
p, err := goyaml.PathString(path)
if err != nil {
return nil, err
}
file, err := parser.ParseBytes(yml, 0)
if err != nil {
return nil, err
}
// Retrieve the current node placed at the specified path.
oldNode, err := p.FilterFile(file)
if err != nil {
return nil, err
}
newNode := &ast.StringNode{
BaseNode: &ast.BaseNode{},
Token: oldNode.GetToken(),
Value: value,
}
err = p.ReplaceWithNode(file, newNode)
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
_, err = io.Copy(buf, file)
return buf.Bytes(), err
}