mirror of https://github.com/mikefarah/yq.git
98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
package yqlib
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import (
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"bufio"
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"container/list"
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"fmt"
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"io/ioutil"
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"os"
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"gopkg.in/yaml.v3"
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)
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type loadPrefs struct {
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loadAsString bool
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}
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func loadString(filename string) (*CandidateNode, error) {
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// ignore CWE-22 gosec issue - that's more targetted for http based apps that run in a public directory,
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// and ensuring that it's not possible to give a path to a file outside that directory.
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filebytes, err := ioutil.ReadFile(filename) // #nosec
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if err != nil {
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return nil, err
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}
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return &CandidateNode{Node: &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: string(filebytes)}}, nil
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}
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func loadYaml(filename string) (*CandidateNode, error) {
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file, err := os.Open(filename) // #nosec
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if err != nil {
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return nil, err
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}
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reader := bufio.NewReader(file)
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documents, err := readDocuments(reader, filename, 0)
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if err != nil {
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return nil, err
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}
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if documents.Len() == 0 {
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// return null candidate
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return &CandidateNode{Node: &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!null"}}, nil
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} else if documents.Len() == 1 {
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return documents.Front().Value.(*CandidateNode), nil
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} else {
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sequenceNode := &CandidateNode{Node: &yaml.Node{Kind: yaml.SequenceNode}}
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for doc := documents.Front(); doc != nil; doc = doc.Next() {
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sequenceNode.Node.Content = append(sequenceNode.Node.Content, doc.Value.(*CandidateNode).Node)
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}
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return sequenceNode, nil
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}
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}
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func loadYamlOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debugf("loadYamlOperator")
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loadPrefs := expressionNode.Operation.Preferences.(loadPrefs)
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// need to evaluate the 1st parameter against the context
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// and return the data accordingly.
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var results = list.New()
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for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
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candidate := el.Value.(*CandidateNode)
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rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.Rhs)
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if err != nil {
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return Context{}, err
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}
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if rhs.MatchingNodes.Front() == nil {
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return Context{}, fmt.Errorf("Filename expression returned nil")
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}
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nameCandidateNode := rhs.MatchingNodes.Front().Value.(*CandidateNode)
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filename := nameCandidateNode.Node.Value
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var contentsCandidate *CandidateNode
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if loadPrefs.loadAsString {
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contentsCandidate, err = loadString(filename)
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} else {
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contentsCandidate, err = loadYaml(filename)
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}
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if err != nil {
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return Context{}, fmt.Errorf("Failed to load %v: %w", filename, err)
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}
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results.PushBack(contentsCandidate)
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}
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return context.ChildContext(results), nil
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}
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