add auth service register

frontend/src/services/auth.ts

@@ -0,0 +1,54 @@
+/**
+ * This file contains business logic regarding authentication.
+ */
+
+import { getApiUrl, HttpStatusCode } from '@utils';
+import { RegisterError } from './errors';
+
+import type { User, UserRole } from '@t';
+
+export interface RegisterReponse {
+    accessToken: string;
+    refreshToken: string;
+    user: User;
+}
+
+/**
+ * Registers a user if the given email is not already registered.
+ */
+export async function register(
+    email: string,
+    password: string,
+    role: UserRole = 'startup_owner'
+): Promise<RegisterReponse> {
+    const url = getApiUrl('/auth/signup');
+    const body = {
+        email,
+        password,
+        role,
+    };
+
+    const res = await fetch(url, {
+        method: 'POST',
+        body: JSON.stringify(body),
+        headers: {
+            'Content-Type': 'application/json',
+        },
+    });
+    // the backend should always return json for the api calls
+    const json = await res.json();
+
+    if (res.status !== HttpStatusCode.CREATED) {
+        throw new RegisterError('Failed to register', res.status, json);
+    }
+
+    return json as RegisterReponse;
+}
+
+/**
+ * Saves the refresh token in localStorage.
+ */
+export function saveRefreshToken(refreshToken: string) {
+    // IMPORTANT:  The location on where the token is saved must be revisited.
+    localStorage.setItem('refresh_token', refreshToken);
+}

frontend/src/services/errors.ts

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+export const API_ERROR = 'ApiError';
+export const REGISTER_ERROR = 'RegisterError';
+
+export class ApiError extends Error {
+    // statusCode represents the status of the response
+    public statusCode: number;
+    public body: any;
+
+    constructor(message: string, statusCode: number, body: any) {
+        super(message);
+        this.name = API_ERROR;
+        this.statusCode = statusCode;
+        this.body = body;
+    }
+}
+
+export class RegisterError extends ApiError {
+    constructor(message: string, statusCode: number, body: any) {
+        super(message, statusCode, body);
+        this.name = REGISTER_ERROR;
+    }
+}

frontend/src/services/index.ts

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+export { register, saveRefreshToken } from './auth';
+export { RegisterError, ApiError, API_ERROR, REGISTER_ERROR } from './errors';