New route and button to anonymize old users

users.go

@@ -81,6 +81,38 @@ func declareAPIAdminUsersRoutes(router *gin.RouterGroup) {
 		c.JSON(http.StatusOK, ret)
 	})
 
+	// Anonymize old accounts
+	router.PATCH("/users", func(c *gin.Context) {
+		users, err := getUsers()
+		if err != nil {
+			log.Println("Unable to getUsers:", err)
+			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": "Unable to retrieve users. Please try again later."})
+			return
+		}
+
+		var filterPromo *uint64
+		if c.Query("promo") != "" {
+			fPromo, err := strconv.ParseUint(c.Query("promo"), 10, 64)
+			if err != nil {
+				c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"errmsg": fmt.Sprintf("Unable to parse promo: %s", err.Error())})
+				return
+			}
+			filterPromo = &fPromo
+		}
+
+		for _, u := range users {
+			if (filterPromo == nil && u.Promo < currentPromo-1) || (filterPromo != nil && uint(*filterPromo) == u.Promo) {
+				u.Anonymize()
+				_, err = u.Update()
+				if err != nil {
+					log.Printf("Unable to anonymize %s: %s", u.Login, err.Error())
+				}
+			}
+		}
+
+		c.JSON(http.StatusOK, true)
+	})
+
 	usersRoutes := router.Group("/users/:uid")
 	usersRoutes.Use(userHandler)
 
@@ -247,6 +279,13 @@ func NewUser(login string, email string, firstname string, lastname string, prom
 	}
 }
 
+func (u *User) Anonymize() {
+	u.Login = fmt.Sprintf("Anonyme #%d", u.Id)
+	u.Email = fmt.Sprintf("anonyme-%d@non-existant.email", u.Id)
+	u.Firstname = "Arnaud"
+	u.Lastname = "Nimes"
+}
+
 func (u User) Update() (int64, error) {
 	if res, err := DBExec("UPDATE users SET login = ?, email = ?, firstname = ?, lastname = ?, time = ?, promo = ?, groups = ? WHERE id_user = ?", u.Login, u.Email, u.Firstname, u.Lastname, u.Time, u.Promo, u.Groups, u.Id); err != nil {
 		return 0, err