feat: preparing structures for validation features;

feat: config variables for password requirements;
feat: util function for validating passwords

backend/internal/models/auth.go

@@ -1,31 +1,33 @@
 package models
 
 type Tokens struct {
-	AccessToken string `json:"access_token"`
+	AccessToken string  `json:"access_token"`
 	RefreshToken string `json:"refresh_token"`
 }
 
 type RegistrationBeginRequest struct {
-	Username string `json:"username"`
-	Email		 *string `json:"email"`
-	Password string `json:"password"` // TODO: password checking
+	Username string  `json:"username" binding:"required,min=3,max=20"`
+	Email		 *string `json:"email" binding:"email"`
+	Password string  `json:"password" binding:"required,password"` // TODO: password checking
 }
 
+// TODO: length check
 type RegistrationCompleteRequest struct {
-	Username 					string `json:"username"`
-	VerificationCode	string `json:"verification_code"`
-	Name							string `json:"name"`
+	Username 					string  `json:"username" binding:"required"`
+	VerificationCode	string  `json:"verification_code" binding:"required"`
+	Name							string  `json:"name" binding:"required,max=75"`
 	Birthday					*string `json:"birthday"`
-	AvatarUrl					*string `json:"avatar_url"`
+	AvatarUrl					*string `json:"avatar_url" binding:"http_url,max=255"`
 }
 
 type RegistrationCompleteResponse struct {
 	Tokens
 }
 
+// TODO: length check
 type LoginRequest struct {
-	Username string `json:"username"`
-	Password string `json:"password"`
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
 	TOTP 		 *string `json:"totp"`
 }
 
@@ -33,8 +35,9 @@ type LoginResponse struct {
 	Tokens
 }
 
+// TODO: length check
 type RefreshRequest struct {
-	RefreshToken string `json:"refresh_token"`
+	RefreshToken string `json:"refresh_token" binding:"required"`
 }
 
 type RefreshResponse struct {