add temp ban change username

Dockerfile

-FROM node
+FROM node:buster-slim
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
-COPY package.json /usr/src/app/
-COPY package-lock.json /usr/src/app/
-RUN npm install && npm cache clean --force
+COPY package*.json /usr/src/app/
+RUN npm ci && npm cache clean --force
 COPY . /usr/src/app
 
 CMD [ "npm", "start" ]

src/controllers/user.ts

@@ -56,6 +56,10 @@ export const UpdateProfiles = async (ctx: Context) => {
         ctx.throw(400);
     }
 
+    if (user.username && process.env.NO_CHANGE_USERNAME) {
+        ctx.throw("Changing username is currently not allowed.", 400);
+    }
+
     const userRep = getEntityManager().getRepository(User);
 
     let _user: User | undefined = await userRep
@@ -209,4 +213,4 @@ export const getUserAvatar = async (ctx: Context) => {
         return ctx.throw(404);
     }
     ctx.body = user.avatarURL()
-};
+};
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