mirror of https://github.com/helm/helm.git
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
/*
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Copyright The Helm 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 chartutil
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import (
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"bytes"
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"fmt"
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"strings"
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"github.com/pkg/errors"
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"github.com/xeipuuv/gojsonschema"
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"sigs.k8s.io/yaml"
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"helm.sh/helm/v3/pkg/chart"
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)
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// ValidateAgainstSchema checks that values does not violate the structure laid out in schema
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func ValidateAgainstSchema(chrt *chart.Chart, values map[string]interface{}) error {
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var sb strings.Builder
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if chrt.Schema != nil {
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err := ValidateAgainstSingleSchema(values, chrt.Schema)
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if err != nil {
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sb.WriteString(fmt.Sprintf("%s:\n", chrt.Name()))
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sb.WriteString(err.Error())
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}
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}
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// For each dependency, recursively call this function with the coalesced values
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for _, subchart := range chrt.Dependencies() {
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subchartValues := values[subchart.Name()].(map[string]interface{})
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if err := ValidateAgainstSchema(subchart, subchartValues); err != nil {
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sb.WriteString(err.Error())
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}
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}
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if sb.Len() > 0 {
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return errors.New(sb.String())
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}
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return nil
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}
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// ValidateAgainstSingleSchema checks that values does not violate the structure laid out in this schema
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func ValidateAgainstSingleSchema(values Values, schemaJSON []byte) (reterr error) {
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defer func() {
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if r := recover(); r != nil {
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reterr = fmt.Errorf("unable to validate schema: %s", r)
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}
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}()
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valuesData, err := yaml.Marshal(values)
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if err != nil {
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return err
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}
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valuesJSON, err := yaml.YAMLToJSON(valuesData)
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if err != nil {
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return err
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}
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if bytes.Equal(valuesJSON, []byte("null")) {
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valuesJSON = []byte("{}")
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}
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schemaLoader := gojsonschema.NewBytesLoader(schemaJSON)
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valuesLoader := gojsonschema.NewBytesLoader(valuesJSON)
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result, err := gojsonschema.Validate(schemaLoader, valuesLoader)
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if err != nil {
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return err
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}
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if !result.Valid() {
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var sb strings.Builder
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for _, desc := range result.Errors() {
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sb.WriteString(fmt.Sprintf("- %s\n", desc))
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}
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return errors.New(sb.String())
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}
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return nil
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}
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