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package coll
import (
"fmt"
"reflect"
"k8s.io/client-go/util/jsonpath"
)
// JSONPath -
func JSONPath(p string, in interface{}) (interface{}, error) {
jp, err := parsePath(p)
if err != nil {
return nil, fmt.Errorf("couldn't parse JSONPath %s: %w", p, err)
}
results, err := jp.FindResults(in)
if err != nil {
return nil, fmt.Errorf("executing JSONPath failed: %w", err)
}
var out interface{}
if len(results) == 1 && len(results[0]) == 1 {
v := results[0][0]
out, err = extractResult(v)
if err != nil {
return nil, err
}
} else {
a := []interface{}{}
for _, r := range results {
for _, v := range r {
o, err := extractResult(v)
if err != nil {
return nil, err
}
if o != nil {
a = append(a, o)
}
}
}
out = a
}
return out, nil
}
func parsePath(p string) (*jsonpath.JSONPath, error) {
jp := jsonpath.New("<jsonpath>")
err := jp.Parse("{" + p + "}")
if err != nil {
return nil, err
}
jp.AllowMissingKeys(false)
return jp, nil
}
func extractResult(v reflect.Value) (interface{}, error) {
if v.CanInterface() {
return v.Interface(), nil
}
return nil, fmt.Errorf("JSONPath couldn't access field")
}
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