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127 lines
3.6 KiB
127 lines
3.6 KiB
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 expansion
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import (
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"bytes"
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"fmt"
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"github.com/ghodss/yaml"
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"github.com/juju/gojsonschema"
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"github.com/kubernetes/helm/pkg/chart"
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)
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// ValidateRequest does basic sanity checks on the request.
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func ValidateRequest(request *ServiceRequest) error {
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if request.ChartInvocation == nil {
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return fmt.Errorf("Request does not have invocation field")
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}
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if request.Chart == nil {
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return fmt.Errorf("Request does not have chart field")
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}
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chartInv := request.ChartInvocation
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chartFile := request.Chart.Chartfile
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l, err := chart.Parse(chartInv.Type)
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if err != nil {
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return fmt.Errorf("cannot parse chart reference %s: %s", chartInv.Type, err)
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}
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if l.Name != chartFile.Name {
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return fmt.Errorf("Chart invocation type (%s) does not match provided chart (%s)", chartInv.Type, chartFile.Name)
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}
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if chartFile.Expander == nil {
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message := fmt.Sprintf("Chart JSON does not have expander field")
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return fmt.Errorf("%s: %s", chartInv.Name, message)
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}
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return nil
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}
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// ValidateProperties validates the properties in the chart invocation against the schema file in
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// the chart itself, which is assumed to be JSONschema. It also modifies a copy of the request to
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// add defaults values if properties are not provided (according to the default field in
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// JSONschema), and returns this copy.
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func ValidateProperties(request *ServiceRequest) (*ServiceRequest, error) {
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schemaFilename := request.Chart.Chartfile.Schema
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if schemaFilename == "" {
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// No schema, so perform no validation.
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return request, nil
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}
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chartInv := request.ChartInvocation
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var schemaBytes *[]byte
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for _, f := range request.Chart.Members {
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if f.Path == schemaFilename {
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schemaBytes = &f.Content
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}
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}
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if schemaBytes == nil {
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return nil, fmt.Errorf("%s: The schema referenced from the Chart.yaml cannot be found: %s",
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chartInv.Name, schemaFilename)
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}
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var schemaDoc interface{}
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if err := yaml.Unmarshal(*schemaBytes, &schemaDoc); err != nil {
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return nil, fmt.Errorf("%s: %s was not valid YAML: %v",
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chartInv.Name, schemaFilename, err)
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}
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// Build a schema object
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schema, err := gojsonschema.NewSchema(gojsonschema.NewGoLoader(schemaDoc))
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if err != nil {
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return nil, err
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}
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// Do validation
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result, err := schema.Validate(gojsonschema.NewGoLoader(request.ChartInvocation.Properties))
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if err != nil {
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return nil, err
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}
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// Need to concat errors here
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if !result.Valid() {
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var message bytes.Buffer
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message.WriteString("Properties failed validation:\n")
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for _, err := range result.Errors() {
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message.WriteString(fmt.Sprintf("- %s", err))
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}
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return nil, fmt.Errorf("%s: %s", chartInv.Name, message.String())
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}
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// Fill in defaults (after validation).
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modifiedProperties, err := schema.InsertDefaults(request.ChartInvocation.Properties)
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if err != nil {
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return nil, err
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}
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modifiedResource := *request.ChartInvocation
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modifiedResource.Properties = modifiedProperties
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modifiedRequest := &ServiceRequest{
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ChartInvocation: &modifiedResource,
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Chart: request.Chart,
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}
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return modifiedRequest, nil
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}
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