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package matchers
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"github.com/onsi/gomega/format"
)
type MatchJSONMatcher struct {
JSONToMatch interface{}
}
func (matcher *MatchJSONMatcher) Match(actual interface{}) (success bool, err error) {
actualString, expectedString, err := matcher.prettyPrint(actual)
if err != nil {
return false, err
}
var aval interface{}
var eval interface{}
// this is guarded by prettyPrint
json.Unmarshal([]byte(actualString), &aval)
json.Unmarshal([]byte(expectedString), &eval)
return reflect.DeepEqual(aval, eval), nil
}
func (matcher *MatchJSONMatcher) FailureMessage(actual interface{}) (message string) {
actualString, expectedString, _ := matcher.prettyPrint(actual)
return format.Message(actualString, "to match JSON of", expectedString)
}
func (matcher *MatchJSONMatcher) NegatedFailureMessage(actual interface{}) (message string) {
actualString, expectedString, _ := matcher.prettyPrint(actual)
return format.Message(actualString, "not to match JSON of", expectedString)
}
func (matcher *MatchJSONMatcher) prettyPrint(actual interface{}) (actualFormatted, expectedFormatted string, err error) {
actualString, ok := toString(actual)
if !ok {
return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte. Got actual:\n%s", format.Object(actual, 1))
}
expectedString, ok := toString(matcher.JSONToMatch)
if !ok {
return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte. Got expected:\n%s", format.Object(matcher.JSONToMatch, 1))
}
abuf := new(bytes.Buffer)
ebuf := new(bytes.Buffer)
if err := json.Indent(abuf, []byte(actualString), "", " "); err != nil {
return "", "", fmt.Errorf("Actual '%s' should be valid JSON, but it is not.\nUnderlying error:%s", actualString, err)
}
if err := json.Indent(ebuf, []byte(expectedString), "", " "); err != nil {
return "", "", fmt.Errorf("Expected '%s' should be valid JSON, but it is not.\nUnderlying error:%s", expectedString, err)
}
return abuf.String(), ebuf.String(), nil
}
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