Add mutations setUsername and setHandle

Closes #70

src/lib/errors/HandleInUseError.ts

@@ -0,0 +1,10 @@
+import {BaseError} from "./BaseError";
+
+/**
+ * An error that is thrown when the user changes the handle to a value that is already used by a different user
+ */
+export class HandleInUseError extends BaseError {
+    constructor(handle: string) {
+        super(`A different user is already using the handle '${handle}'!`);
+    }
+}

src/routes/graphql/MutationResolver.ts

@@ -4,6 +4,7 @@ import isEmail from "validator/lib/isEmail";
 import dataAccess from "../../lib/dataAccess";
 import {BlacklistedError} from "../../lib/errors/BlacklistedError";
 import {GroupNotFoundError} from "../../lib/errors/GroupNotFoundError";
+import {HandleInUseError} from "../../lib/errors/HandleInUseError";
 import {InvalidEmailError} from "../../lib/errors/InvalidEmailError";
 import {NotAGroupAdminError} from "../../lib/errors/NotAGroupAdminError";
 import {NotAnAdminError} from "../../lib/errors/NotAnAdminError";
@@ -98,6 +99,36 @@ export class MutationResolver extends BaseResolver {
         return user;
     }
 
+    /**
+     * Sets a new username for a user
+     * @param username
+     * @param request
+     */
+    public async setUsername({username}: {username: string}, request: any): Promise<User> {
+        this.ensureLoggedIn(request);
+        const user = await User.findByPk(request.session.userId);
+        user.username = username;
+        await user.save();
+        return user;
+    }
+
+    /**
+     * Sets a new handle for the user. If the handle is alredy used by a different user, an error is returned
+     * @param handle
+     * @param request
+     */
+    public async setHandle({handle}: {handle: string}, request: any): Promise<User> {
+        this.ensureLoggedIn(request);
+        const user = await User.findByPk(request.session.userId);
+        const handleAvailable = !(await User.findOne({where: {handle}}));
+        if (!handleAvailable) {
+            throw new HandleInUseError(handle);
+        }
+        user.handle = handle;
+        await user.save();
+        return user;
+    }
+
     /**
      * Sets the frontend settings for the logged in user
      * @param settings

src/routes/graphql/schema.graphql

@@ -60,6 +60,12 @@ type Mutation {
     "Sets the user settings to the specified settings string. The settings parameter should be a valid yaml."
     setUserSettings(settings: String!): String!
 
+    "Sets a new username"
+    setUsername(username: String!): Profile!
+
+    "Sets a new handle"
+    setHandle(handle: String!): Profile!
+
     "Logout of the user."
     logout: Boolean