1package matchers
 2
 3import (
 4	"bytes"
 5	"encoding/json"
 6	"fmt"
 7
 8	"github.com/onsi/gomega/format"
 9)
10
11type MatchJSONMatcher struct {
12	JSONToMatch      interface{}
13	firstFailurePath []interface{}
14}
15
16func (matcher *MatchJSONMatcher) Match(actual interface{}) (success bool, err error) {
17	actualString, expectedString, err := matcher.prettyPrint(actual)
18	if err != nil {
19		return false, err
20	}
21
22	var aval interface{}
23	var eval interface{}
24
25	// this is guarded by prettyPrint
26	json.Unmarshal([]byte(actualString), &aval)
27	json.Unmarshal([]byte(expectedString), &eval)
28	var equal bool
29	equal, matcher.firstFailurePath = deepEqual(aval, eval)
30	return equal, nil
31}
32
33func (matcher *MatchJSONMatcher) FailureMessage(actual interface{}) (message string) {
34	actualString, expectedString, _ := matcher.prettyPrint(actual)
35	return formattedMessage(format.Message(actualString, "to match JSON of", expectedString), matcher.firstFailurePath)
36}
37
38func (matcher *MatchJSONMatcher) NegatedFailureMessage(actual interface{}) (message string) {
39	actualString, expectedString, _ := matcher.prettyPrint(actual)
40	return formattedMessage(format.Message(actualString, "not to match JSON of", expectedString), matcher.firstFailurePath)
41}
42
43func (matcher *MatchJSONMatcher) prettyPrint(actual interface{}) (actualFormatted, expectedFormatted string, err error) {
44	actualString, ok := toString(actual)
45	if !ok {
46		return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte.  Got actual:\n%s", format.Object(actual, 1))
47	}
48	expectedString, ok := toString(matcher.JSONToMatch)
49	if !ok {
50		return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte.  Got expected:\n%s", format.Object(matcher.JSONToMatch, 1))
51	}
52
53	abuf := new(bytes.Buffer)
54	ebuf := new(bytes.Buffer)
55
56	if err := json.Indent(abuf, []byte(actualString), "", "  "); err != nil {
57		return "", "", fmt.Errorf("Actual '%s' should be valid JSON, but it is not.\nUnderlying error:%s", actualString, err)
58	}
59
60	if err := json.Indent(ebuf, []byte(expectedString), "", "  "); err != nil {
61		return "", "", fmt.Errorf("Expected '%s' should be valid JSON, but it is not.\nUnderlying error:%s", expectedString, err)
62	}
63
64	return abuf.String(), ebuf.String(), nil
65}