package matchers import ( "bytes" "encoding/json" "fmt" "github.com/onsi/gomega/format" ) type MatchJSONMatcher struct { JSONToMatch interface{} firstFailurePath []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) var equal bool equal, matcher.firstFailurePath = deepEqual(aval, eval) return equal, nil } func (matcher *MatchJSONMatcher) FailureMessage(actual interface{}) (message string) { actualString, expectedString, _ := matcher.prettyPrint(actual) return formattedMessage(format.Message(actualString, "to match JSON of", expectedString), matcher.firstFailurePath) } func (matcher *MatchJSONMatcher) NegatedFailureMessage(actual interface{}) (message string) { actualString, expectedString, _ := matcher.prettyPrint(actual) return formattedMessage(format.Message(actualString, "not to match JSON of", expectedString), matcher.firstFailurePath) } 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 }