Fix swagger data struct error

Signed-off-by: Asai Neko <sugar@sne.moe>

service/service_auth/exchange.go

@@ -23,11 +23,13 @@ type ExchangePayload struct {
 	Data    *ExchangeData
 }
 
+type ExchangeResponse struct {
+	RedirectUri string `json:"redirect_uri"`
+}
+
 type ExchangeResult struct {
 	Common shared.CommonResult
-	Data   *struct {
-		RedirectUri string `json:"redirect_uri"`
-	}
+	Data   *ExchangeResponse
 }
 
 func (self *AuthServiceImpl) Exchange(payload *ExchangePayload) (result *ExchangeResult) {
@@ -113,16 +115,14 @@ func (self *AuthServiceImpl) Exchange(payload *ExchangePayload) (result *Exchang
 		SetError(nil).
 		Throw(payload.Context)
 
-	resultData := struct {
-		RedirectUri string `json:"redirect_uri"`
-	}{url.String()}
+	resultData := &ExchangeResponse{url.String()}
 
 	result = &ExchangeResult{
 		Common: shared.CommonResult{
 			HttpCode:  200,
 			Exception: exception,
 		},
-		Data: &resultData,
+		Data: resultData,
 	}
 
 	return