136 lines
3.9 KiB
Go
136 lines
3.9 KiB
Go
package matchers
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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"github.com/onsi/gomega/format"
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)
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type MatchJSONMatcher struct {
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JSONToMatch interface{}
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firstFailurePath []interface{}
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}
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func (matcher *MatchJSONMatcher) Match(actual interface{}) (success bool, err error) {
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actualString, expectedString, err := matcher.prettyPrint(actual)
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if err != nil {
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return false, err
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}
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var aval interface{}
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var eval interface{}
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// this is guarded by prettyPrint
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json.Unmarshal([]byte(actualString), &aval)
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json.Unmarshal([]byte(expectedString), &eval)
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var equal bool
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equal, matcher.firstFailurePath = deepEqual(aval, eval)
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return equal, nil
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}
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func (matcher *MatchJSONMatcher) FailureMessage(actual interface{}) (message string) {
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actualString, expectedString, _ := matcher.prettyPrint(actual)
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return formattedMessage(format.Message(actualString, "to match JSON of", expectedString), matcher.firstFailurePath)
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}
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func (matcher *MatchJSONMatcher) NegatedFailureMessage(actual interface{}) (message string) {
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actualString, expectedString, _ := matcher.prettyPrint(actual)
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return formattedMessage(format.Message(actualString, "not to match JSON of", expectedString), matcher.firstFailurePath)
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}
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func formattedMessage(comparisonMessage string, failurePath []interface{}) string {
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var diffMessage string
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if len(failurePath) == 0 {
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diffMessage = ""
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} else {
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diffMessage = fmt.Sprintf("\n\nfirst mismatched key: %s", formattedFailurePath(failurePath))
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}
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return fmt.Sprintf("%s%s", comparisonMessage, diffMessage)
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}
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func formattedFailurePath(failurePath []interface{}) string {
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formattedPaths := []string{}
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for i := len(failurePath) - 1; i >= 0; i-- {
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switch p := failurePath[i].(type) {
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case int:
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formattedPaths = append(formattedPaths, fmt.Sprintf(`[%d]`, p))
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default:
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if i != len(failurePath)-1 {
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formattedPaths = append(formattedPaths, ".")
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}
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formattedPaths = append(formattedPaths, fmt.Sprintf(`"%s"`, p))
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}
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}
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return strings.Join(formattedPaths, "")
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}
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func (matcher *MatchJSONMatcher) prettyPrint(actual interface{}) (actualFormatted, expectedFormatted string, err error) {
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actualString, ok := toString(actual)
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if !ok {
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return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte. Got actual:\n%s", format.Object(actual, 1))
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}
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expectedString, ok := toString(matcher.JSONToMatch)
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if !ok {
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return "", "", fmt.Errorf("MatchJSONMatcher matcher requires a string, stringer, or []byte. Got expected:\n%s", format.Object(matcher.JSONToMatch, 1))
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}
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abuf := new(bytes.Buffer)
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ebuf := new(bytes.Buffer)
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if err := json.Indent(abuf, []byte(actualString), "", " "); err != nil {
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return "", "", fmt.Errorf("Actual '%s' should be valid JSON, but it is not.\nUnderlying error:%s", actualString, err)
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}
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if err := json.Indent(ebuf, []byte(expectedString), "", " "); err != nil {
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return "", "", fmt.Errorf("Expected '%s' should be valid JSON, but it is not.\nUnderlying error:%s", expectedString, err)
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}
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return abuf.String(), ebuf.String(), nil
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}
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func deepEqual(a interface{}, b interface{}) (bool, []interface{}) {
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var errorPath []interface{}
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if reflect.TypeOf(a) != reflect.TypeOf(b) {
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return false, errorPath
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}
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switch a.(type) {
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case []interface{}:
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if len(a.([]interface{})) != len(b.([]interface{})) {
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return false, errorPath
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}
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for i, v := range a.([]interface{}) {
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elementEqual, keyPath := deepEqual(v, b.([]interface{})[i])
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if !elementEqual {
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return false, append(keyPath, i)
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}
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}
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return true, errorPath
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case map[string]interface{}:
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if len(a.(map[string]interface{})) != len(b.(map[string]interface{})) {
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return false, errorPath
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}
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for k, v1 := range a.(map[string]interface{}) {
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v2, ok := b.(map[string]interface{})[k]
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if !ok {
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return false, errorPath
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}
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elementEqual, keyPath := deepEqual(v1, v2)
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if !elementEqual {
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return false, append(keyPath, k)
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}
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}
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return true, errorPath
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default:
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return a == b, errorPath
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}
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}
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