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jsonpath.go
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jsonpath.go
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// Copyright 2021 VMware
//
// 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 eval
//go:generate go run -modfile ../../hack/tools/go.mod github.com/maxbrunsfeld/counterfeiter/v6 -generate
import (
"fmt"
"strings"
"github.com/vmware-tanzu/cartographer/pkg/utils"
)
//counterfeiter:generate . Evaluate
type Evaluate func(jsonpathExpression string, obj interface{}) ([]interface{}, error)
type Evaluator struct {
Evaluate Evaluate
}
func EvaluatorBuilder() Evaluator {
return Evaluator{
Evaluate: utils.SinglePathEvaluate,
}
}
func (e Evaluator) EvaluateJsonPath(path string, obj interface{}) (interface{}, error) {
if path == "" {
return nil, fmt.Errorf("empty jsonpath not allowed")
}
jsonpathExpression := ensureValidWrapping(path)
interfaceList, err := e.Evaluate(jsonpathExpression, obj)
if err != nil {
return nil, fmt.Errorf("evaluate: %w", err)
}
if len(interfaceList) > 1 {
return nil, fmt.Errorf("too many results for the query: %s", path)
}
if len(interfaceList) == 0 {
return nil, JsonPathDoesNotExistError{Path: path}
}
return interfaceList[0], nil
}
func ensureValidWrapping(jsonpathExpression string) string {
if !strings.HasPrefix(jsonpathExpression, "{.") {
if !strings.HasPrefix(jsonpathExpression, ".") {
jsonpathExpression = fmt.Sprintf("{.%s", jsonpathExpression)
} else {
jsonpathExpression = fmt.Sprintf("{%s", jsonpathExpression)
}
}
if !strings.HasSuffix(jsonpathExpression, "}") {
jsonpathExpression = fmt.Sprintf("%s}", jsonpathExpression)
}
return jsonpathExpression
}
type JsonPathDoesNotExistError struct {
Path string
}
func (e JsonPathDoesNotExistError) Error() string {
return fmt.Sprintf("jsonpath returned empty list: %s", e.Path)
}