feat: Increase logging verbosity for error responses

http/logging.go

@@ -0,0 +1,38 @@
+package http
+
+import (
+	"bytes"
+	"encoding/json"
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+	"strings"
+)
+
+type errorLogWriter struct {
+	gin.ResponseWriter
+	body *bytes.Buffer
+}
+
+func (w errorLogWriter) Write(b []byte) (int, error) {
+	if w.Status() > 299 && strings.Contains(w.Header().Get("Content-Type"), "application/json") {
+		w.body.Write(b)
+	}
+	return w.ResponseWriter.Write(b)
+}
+
+func responseErrorLoggerMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		blw := &errorLogWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
+		c.Writer = blw
+		c.Next()
+		if len(blw.body.String()) > 0 {
+			response := GenericResponseType{}
+			unmarshalErr := json.Unmarshal(blw.body.Bytes(), &response)
+			if unmarshalErr != nil {
+				logrus.Warningln("Cannot parse error response. Probably not in valid format")
+				return
+			}
+			logrus.Errorf("Returned '%s' error, message: '%s'", response.Error, response.Message)
+		}
+	}
+}

http/main.go

@@ -11,6 +11,7 @@ func SpawnHttpApplication(app *core.ApplicationContainer, listenAddr string) err
 	r := gin.Default()
 
 	authMiddleware := createAuthenticationMiddleware(r, app)
+	errorLoggerMiddleware := responseErrorLoggerMiddleware()
 
 	// set a rate limit of 10 requests per minute for IP address to protect against DoS attacks on login and refresh_token endpoints
 	// for two reasons:
@@ -26,9 +27,9 @@ func SpawnHttpApplication(app *core.ApplicationContainer, listenAddr string) err
 	}).Middleware()
 
 	router := r.Group("/")
-	router.POST("/api/stable/auth/login", authRateLimitMiddleware.Middleware(), authMiddleware.LoginHandler)
-	router.GET("/api/stable/auth/refresh_token", authRateLimitMiddleware.Middleware(), authMiddleware.RefreshHandler)
-	router.Use(authMiddleware.MiddlewareFunc())
+	router.POST("/api/stable/auth/login", errorLoggerMiddleware, authRateLimitMiddleware.Middleware(), authMiddleware.LoginHandler)
+	router.GET("/api/stable/auth/refresh_token", errorLoggerMiddleware, authRateLimitMiddleware.Middleware(), authMiddleware.RefreshHandler)
+	router.Use(authMiddleware.MiddlewareFunc(), errorLoggerMiddleware)
 	{
 		addLookupUserRoute(router, app, defaultRateLimitMiddleware)
 		addWhoamiRoute(router, app, defaultRateLimitMiddleware)