chore: custom error handler with automatic logging

internal/api/api.go

@@ -12,7 +12,6 @@ import (
 
 	"github.com/hazemKrimi/crimson-vault/internal/lib"
 	"github.com/hazemKrimi/crimson-vault/internal/models"
-	"github.com/hazemKrimi/crimson-vault/internal/types"
 )
 
 type API struct {
@@ -28,20 +27,6 @@ func (api *API) Initialize() {
 
 	db := &models.DB{}
 	ech := echo.New()
-	ech.Validator = &CustomValidator{validator: validator}
-	ech.HTTPErrorHandler = func(err error, context echo.Context) {
-		if context.Response().Committed {
-			return
-		}
-
-		custom, ok := err.(types.Error)
-
-		if ok {
-			context.JSONPretty(custom.Code, map[string][]string{"errors": custom.Messages}, " ")
-		}
-
-		ech.DefaultHTTPErrorHandler(err, context)
-	}
 
 	db.Connect(api.ConfigDirectory)
 	db.MigrateClients()
@@ -50,6 +35,9 @@ func (api *API) Initialize() {
 	api.instance = ech
 	api.db = db
 
+	api.instance.Validator = &CustomValidator{validator: validator}
+	api.instance.HTTPErrorHandler = api.CustomErrorHandler
+
 	api.instance.Use(api.LoggerMiddleware())
 	// TODO: Update with appropriate origins when finishing v1
 	api.instance.Use(middleware.CORSWithConfig(middleware.CORSConfig{

internal/api/auth.go

@@ -1,8 +1,7 @@
 package api
 
 import (
-	"fmt"
-	"log"
+	"errors"
 	"net/http"
 
 	"github.com/labstack/echo-contrib/session"
@@ -16,8 +15,7 @@ func (api *API) LoginHandler(context echo.Context) error {
 	var body types.LoginRequestBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error logging User in: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -27,31 +25,27 @@ func (api *API) LoginHandler(context echo.Context) error {
 	var user types.User
 
 	if err := api.db.GetUserByUsername(body.Username, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
 	if match := lib.CheckPasswordHash(body.Password, user.Password); !match {
-		return context.String(http.StatusBadRequest, "Invalid credentials!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid credentials!"}}
 	}
 
 	sess, err := session.Get("session", context)
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error creating User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User session!"}}
 	}
 
 	if err := api.db.UpdateUserSessionID(&user); err != nil {
-		log.Println(fmt.Sprintf("Error creating User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User session!"}}
 	}
 
 	if err := lib.CreateSession(sess, context, &user); err != nil {
-		log.Println(fmt.Sprintf("Error creating User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User session!"}}
 	}
 
-	log.Println(fmt.Sprintf("User with ID %s logged in.", user.ID))
 	return context.JSON(http.StatusOK, user)
 }
 
@@ -59,28 +53,22 @@ func (api *API) LogoutHandler(context echo.Context) error {
 	sessionId, ok := context.Get("sessionId").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error deleting User session!"}}
 	}
 
 	if err := api.db.DeleteUserSessionID(sessionId); err != nil {
-		log.Println(fmt.Sprintf("Error deleting User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User session!"}}
 	}
 
 	sess, err := session.Get("session", context)
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error deleting User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User session!"}}
 	}
 
 	if err := lib.DeleteSession(sess, context); err != nil {
-		log.Println(fmt.Sprintf("Error deleting User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User session!"}}
 	}
 
-	id := context.Get("id")
-
-	log.Println(fmt.Sprintf("User with ID %s logged out.", id))
-	return context.String(http.StatusOK, "Logged out successfully!")
+	return context.JSON(http.StatusOK, map[string]string{"message":"Logged out successfully!"})
 }

internal/api/client.go

@@ -1,8 +1,7 @@
 package api
 
 import (
-	"fmt"
-	"log"
+	"errors"
 	"net/http"
 
 	"github.com/google/uuid"
@@ -15,20 +14,19 @@ func (api *API) CreateClientHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	var body types.CreateClientRequestBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error creating Client: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -37,7 +35,6 @@ func (api *API) CreateClientHandler(context echo.Context) error {
 
 	client := api.db.CreateClient(id, body)
 
-	log.Println(fmt.Sprintf("Client created with ID %s.", client.ID))
 	return context.JSON(http.StatusOK, client)
 }
 
@@ -45,22 +42,21 @@ func (api *API) GetAllClientsHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	clients, err := api.db.GetClients(id)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting Clients!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting Clients!"}}
 	}
 
-	log.Println("Got all Clients.")
 	return context.JSON(http.StatusOK, clients)
 }
 
@@ -68,28 +64,27 @@ func (api *API) GetClientHandler(context echo.Context) error {
 	userIdString, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	userId, err := uuid.Parse(userIdString)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
 
 	if err != nil {
-		return context.String(http.StatusBadRequest, "ID is required to get a Client!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"ID is required to get a Client!"}}
 	}
 
 	var client types.Client
 
 	if err := api.db.GetClientById(userId, id, &client); err != nil {
-		return context.String(http.StatusNotFound, "Client not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"Client not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Got User with ID %s.", client.ID))
 	return context.JSON(http.StatusOK, client)
 }
 
@@ -97,26 +92,31 @@ func (api *API) UpdateClientHandler(context echo.Context) error {
 	userIdString, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	userId, err := uuid.Parse(userIdString)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
 
 	if err != nil {
-		return context.String(http.StatusBadRequest, "ID is required to update a Client!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"ID is required to update a Client!"}}
 	}
 
 	var body types.UpdateClientRequestBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error updating Client: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
+	}
+
+	empty := body == types.UpdateClientRequestBody{}
+
+	if empty {
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"You must update at least one field!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -126,10 +126,9 @@ func (api *API) UpdateClientHandler(context echo.Context) error {
 	var client types.Client
 
 	if err := api.db.UpdateClient(userId, id, body, &client); err != nil {
-		return context.String(http.StatusNotFound, "Client not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"Client not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Updated Client with ID %s.", client.ID))
 	return context.JSON(http.StatusOK, client)
 }
 
@@ -137,25 +136,24 @@ func (api *API) DeleteClientHandler(context echo.Context) error {
 	userIdString, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	userId, err := uuid.Parse(userIdString)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
 
 	if err != nil {
-		return context.String(http.StatusBadRequest, "ID is required to delete a Client!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"ID is required to delete a Client!"}}
 	}
 
 	if err := api.db.DeleteClient(userId, id); err != nil {
-		return context.String(http.StatusNotFound, "Client not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"Client not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Deleted Client with ID %s.", id))
-	return context.String(http.StatusOK, "Client deleted successfully!")
+	return context.JSON(http.StatusOK, map[string]string{"message": "Client deleted successfully!"})
 }

internal/api/error.go

@@ -0,0 +1,37 @@
+package api
+
+import (
+	"github.com/labstack/echo/v4"
+
+	"github.com/hazemKrimi/crimson-vault/internal/types"
+)
+
+func (api *API) CustomErrorHandler(err error, context echo.Context) {
+	if context.Response().Committed {
+		return
+	}
+
+	custom, ok := err.(types.Error)
+
+	if ok {
+		cause, ok := custom.Cause.(error)
+
+		if ok {
+			api.Logger.Error(cause.Error())
+		}
+
+		context.JSON(custom.Code, map[string][]string{"errors": custom.Messages})
+	}
+
+	herr, ok := err.(*echo.HTTPError)
+
+	if ok {
+		message, ok := herr.Message.(string)
+
+		if ok {
+			context.JSON(herr.Code, map[string][]string{"errors": {message}})
+		}
+	}
+
+	api.instance.DefaultHTTPErrorHandler(err, context)
+}

internal/api/middleware.go

@@ -18,25 +18,25 @@ func (api *API) AuthSessionMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
 		sess, err := session.Get("session", context)
 
 		if err != nil || sess.IsNew {
-			return context.String(http.StatusUnauthorized, "User not authenticated!")
+			return types.Error{Code: http.StatusUnauthorized, Messages: []string{"User not authenticated!"}}
 		}
 
 		id, ok := sess.Values["sessionId"].(string)
 
 		if !ok || id == "" {
-			return context.String(http.StatusUnauthorized, "User not authenticated!")
+			return types.Error{Code: http.StatusUnauthorized, Messages: []string{"User not authenticated!"}}
 		}
 
 		sessionId, err := uuid.Parse(id)
 
 		if err != nil {
-			return context.String(http.StatusUnauthorized, "User not authenticated!")
+			return types.Error{Code: http.StatusUnauthorized, Messages: []string{"User not authenticated!"}}
 		}
 
 		var user types.User
 
 		if err := api.db.GetUserBySessionId(sessionId, &user); err != nil {
-			return context.String(http.StatusUnauthorized, "User not authenticated!")
+			return types.Error{Code: http.StatusUnauthorized, Messages: []string{"User not authenticated!"}}
 		}
 
 		context.Set("id", sess.Values["id"])

internal/api/user.go

@@ -1,9 +1,9 @@
 package api
 
 import (
+	"errors"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -21,8 +21,7 @@ func (api *API) CreateUserHandler(context echo.Context) error {
 	var body types.CreateUserRequestBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error creating User: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -32,23 +31,19 @@ func (api *API) CreateUserHandler(context echo.Context) error {
 	user, err := api.db.CreateUser(body)
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error creating User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User!"}}
 	}
 
 	sess, err := session.Get("session", context)
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error creating User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User session!"}}
 	}
 
 	if err := lib.CreateSession(sess, context, &user); err != nil {
-		log.Println(fmt.Sprintf("Error creating User session: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error creating User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User session!"}}
 	}
 
-	log.Println(fmt.Sprintf("User created with ID %s.", user.ID))
 	return context.JSON(http.StatusOK, user)
 }
 
@@ -56,10 +51,9 @@ func (api *API) GetAllUsersHandler(context echo.Context) error {
 	users, err := api.db.GetUsers()
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
-	log.Println("Got all Users.")
 	return context.JSON(http.StatusOK, users)
 }
 
@@ -67,22 +61,21 @@ func (api *API) GetUserHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error getting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	var user types.User
 
 	if err := api.db.GetUserById(id, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Got User with ID %s.", user.ID))
 	return context.JSON(http.StatusOK, user)
 }
 
@@ -90,20 +83,25 @@ func (api *API) UpdateUserHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User!"}}
 	}
 
 	var body types.UpdateUserRequestBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error updating User: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
+	}
+
+	empty := body == types.UpdateUserRequestBody{}
+
+	if empty {
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"You must update at least one field!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -113,10 +111,9 @@ func (api *API) UpdateUserHandler(context echo.Context) error {
 	var user types.User
 
 	if err := api.db.UpdateUser(id, body, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Updated user with ID %s.", user.ID))
 	return context.JSON(http.StatusOK, user)
 }
 
@@ -124,20 +121,19 @@ func (api *API) UpdateUserSecurityCredentialsHandler(context echo.Context) error
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User security credentials!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User security credentials!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User security credentials!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User security credentials!"}}
 	}
 
 	var body types.UpdateUserSecurityCredentialsBody
 
 	if err := context.Bind(&body); err != nil {
-		log.Println(fmt.Sprintf("Error creating security details for User: %v.", err))
-		return context.String(http.StatusBadRequest, "Invalid JSON!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
 	}
 
 	if err := context.Validate(body); err != nil {
@@ -147,10 +143,9 @@ func (api *API) UpdateUserSecurityCredentialsHandler(context echo.Context) error
 	var user types.User
 
 	if err := api.db.UpdateUserSecurityCredentials(id, body, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invalid JSON!"}}
 	}
 
-	log.Println(fmt.Sprintf("Updated security details of user with ID %s.", user.ID))
 	return context.JSON(http.StatusOK, user)
 }
 
@@ -158,29 +153,29 @@ func (api *API) UpdateUserLogoHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User logo!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error updating User logo!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	var user types.User
 
 	if err := api.db.GetUserById(id, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
 	if user.Username == "" {
-		return context.String(http.StatusBadRequest, "You have to add a username first for this User!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"You have to add a username first for this User!"}}
 	}
 
 	file, err := context.FormFile("logo")
 
 	if err != nil {
-		return types.Error{Code: http.StatusBadRequest, Messages: []string{"No image has been uploaded!"}}
+		return types.Error{Code: http.StatusUnsupportedMediaType, Messages: []string{"Image must be uploaded in form data!"}}
 	}
 
 	ext := strings.ToLower(filepath.Ext(file.Filename))
@@ -194,14 +189,13 @@ func (api *API) UpdateUserLogoHandler(context echo.Context) error {
 	}
 
 	if !allowedExtensions[ext] {
-		return context.String(http.StatusBadRequest, "Invalid file type, only image files are allowed!")
+		return types.Error{Code: http.StatusUnsupportedMediaType, Messages: []string{"Invalid file type, only image files are allowed!"}}
 	}
 
 	src, err := file.Open()
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error updating logo for User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating logo User logo!"}}
 	}
 
 	defer src.Close()
@@ -209,35 +203,31 @@ func (api *API) UpdateUserLogoHandler(context echo.Context) error {
 	data, err := io.ReadAll(src)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating logo User logo!"}}
 	}
 
 	filetype := http.DetectContentType(data)
 
 	if !strings.HasPrefix(filetype, "image/") {
-		return context.String(http.StatusBadRequest, "Uploaded file is not a valid image!")
+		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Uploaded file is not a valid image!"}}
 	}
 
 	if err := os.MkdirAll(filepath.Join(api.ConfigDirectory, user.Username), os.ModePerm); err != nil {
-		log.Println(fmt.Sprintf("Error updating logo for User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	path, err := filepath.Abs(filepath.Join(api.ConfigDirectory, user.Username, fmt.Sprintf("logo%s", ext)))
 
 	if err != nil {
-		log.Println(fmt.Sprintf("Error updating logo for User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	if err := os.WriteFile(path, data, 0644); err != nil {
-		log.Println(fmt.Sprintf("Error updating logo for User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	if err := api.db.UpdateUserLogo(path, &user); err != nil {
-		log.Println(fmt.Sprintf("Error updating logo for User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error while updating logo for User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	return context.JSON(http.StatusOK, user)
@@ -247,49 +237,46 @@ func (api *API) DeleteUserHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User!"}}
 	}
 
 	if err := api.db.DeleteUser(id); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
-	log.Println(fmt.Sprintf("Deleted User with ID %d.", id))
-	return context.String(http.StatusOK, "User deleted successfully!")
+	return context.JSON(http.StatusOK, map[string]string{"message":"User deleted successfully!"})
 }
 
 func (api *API) DeleteUserLogoHandler(context echo.Context) error {
 	userId, ok := context.Get("id").(string)
 
 	if !ok {
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User logo!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error deleting User logo!"}}
 	}
 
 	id, err := uuid.Parse(userId)
 
 	if err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting User logo!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User logo!"}}
 	}
 
 	var user types.User
 
 	if err := api.db.GetUserById(id, &user); err != nil {
-		return context.String(http.StatusNotFound, "User not found!")
+		return types.Error{Code: http.StatusNotFound, Messages: []string{"User not found!"}}
 	}
 
 	os.Remove(user.Logo)
 
 	if err := api.db.DeleteUserLogo(&user); err != nil {
-		log.Println(fmt.Sprintf("Error deleting logo of User: %v.", err))
-		return context.String(http.StatusInternalServerError, "Unexpected error deleting logo of User!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User logo!"}}
 	}
 
-	log.Println(fmt.Sprintf("Deleted logo of User with ID %s.", user.ID))
-	return context.String(http.StatusOK, "User logo deleted successfully!")
+	return context.JSON(http.StatusOK, map[string]string{"message":"User logo deleted successfully!"})
 }

internal/api/validator.go

@@ -17,7 +17,7 @@ type CustomValidator struct {
 func (v *CustomValidator) Validate(i any) error {
 	if err := v.validator.Struct(i); err != nil {
 		if validationErrors, ok := err.(validator.ValidationErrors); ok {
-			errors := make([]string, 0, 10)
+			errs := make([]string, 0, 10)
 
 			for _, ve := range validationErrors {
 				field := ve.Field()
@@ -42,9 +42,9 @@ func (v *CustomValidator) Validate(i any) error {
 					msg = fmt.Sprintf("%s is not valid!", field)
 				}
 
-				errors = append(errors, msg)
+				errs = append(errs, msg)
 			}
-			return types.Error{Code: http.StatusBadRequest, Messages: errors}
+			return types.Error{Code: http.StatusBadRequest, Messages: errs}
 		}
 	}
 

internal/lib/utils.go

@@ -27,7 +27,7 @@ func GetConfigDirectory() (string, error) {
 
 func SaveSession(session *sessions.Session, context echo.Context) error {
 	if err := session.Save(context.Request(), context.Response()); err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error saving User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error saving User session!"}}
 	}
 
 	return nil
@@ -35,7 +35,7 @@ func SaveSession(session *sessions.Session, context echo.Context) error {
 
 func CreateSession(session *sessions.Session, context echo.Context, user *types.User) error {
 	if err := uuid.Validate(user.SessionID); err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error saving User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error saving User session!"}}
 	}
 
 	session.Options = &sessions.Options{
@@ -48,7 +48,7 @@ func CreateSession(session *sessions.Session, context echo.Context, user *types.
 	session.Values["username"] = user.Username
 
 	if err := SaveSession(session, context); err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error saving User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error saving User session!"}}
 	}
 
 	return nil
@@ -58,7 +58,7 @@ func DeleteSession(session *sessions.Session, context echo.Context) error {
 	session.Options.MaxAge = -1
 
 	if err := SaveSession(session, context); err != nil {
-		return context.String(http.StatusInternalServerError, "Unexpected error saving User session!")
+		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error saving User session!"}}
 	}
 
 	return nil

internal/types/error.go

@@ -1,13 +1,17 @@
 package types
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 type Error struct {
 	Messages []string
+	Cause    error
 	Code     int
 }
 
 func (err Error) Error() string {
-	return fmt.Sprintf("%v",
-		err.Messages)
+	return fmt.Sprintf("%s",
+		strings.Join(err.Messages, ", "))
 }