1 files changed, 146 insertions, 0 deletions
diff --git a/src/connections/EpicGames/index.ts b/src/connections/EpicGames/index.ts
new file mode 100644
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--- /dev/null
+++ b/src/connections/EpicGames/index.ts
@@ -0,0 +1,146 @@
+/*
+	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
+	Copyright (C) 2023 Spacebar and Spacebar Contributors
+	
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published
+	by the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+	
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+	
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import {
+	ConnectedAccount,
+	ConnectedAccountCommonOAuthTokenResponse,
+	ConnectionCallbackSchema,
+	ConnectionLoader,
+	DiscordApiErrors,
+} from "@spacebar/util";
+import wretch from "wretch";
+import Connection from "../../util/connections/Connection";
+import { EpicGamesSettings } from "./EpicGamesSettings";
+
+export interface UserResponse {
+	accountId: string;
+	displayName: string;
+	preferredLanguage: string;
+}
+
+export interface EpicTokenResponse
+	extends ConnectedAccountCommonOAuthTokenResponse {
+	expires_at: string;
+	refresh_expires_in: number;
+	refresh_expires_at: string;
+	account_id: string;
+	client_id: string;
+	application_id: string;
+}
+
+export default class EpicGamesConnection extends Connection {
+	public readonly id = "epicgames";
+	public readonly authorizeUrl = "https://www.epicgames.com/id/authorize";
+	public readonly tokenUrl = "https://api.epicgames.dev/epic/oauth/v1/token";
+	public readonly userInfoUrl =
+		"https://api.epicgames.dev/epic/id/v1/accounts";
+	public readonly scopes = ["basic profile"];
+	settings: EpicGamesSettings = new EpicGamesSettings();
+
+	init(): void {
+		this.settings = ConnectionLoader.getConnectionConfig(
+			this.id,
+			this.settings,
+		) as EpicGamesSettings;
+	}
+
+	getAuthorizationUrl(userId: string): string {
+		const state = this.createState(userId);
+		const url = new URL(this.authorizeUrl);
+
+		url.searchParams.append("client_id", this.settings.clientId!);
+		url.searchParams.append("redirect_uri", this.getRedirectUri());
+		url.searchParams.append("response_type", "code");
+		url.searchParams.append("scope", this.scopes.join(" "));
+		url.searchParams.append("state", state);
+		return url.toString();
+	}
+
+	getTokenUrl(): string {
+		return this.tokenUrl;
+	}
+
+	async exchangeCode(
+		state: string,
+		code: string,
+	): Promise<EpicTokenResponse> {
+		this.validateState(state);
+
+		const url = this.getTokenUrl();
+
+		return wretch(url.toString())
+			.headers({
+				Accept: "application/json",
+				Authorization: `Basic ${Buffer.from(
+					`${this.settings.clientId}:${this.settings.clientSecret}`,
+				).toString("base64")}`,
+				"Content-Type": "application/x-www-form-urlencoded",
+			})
+			.body(
+				new URLSearchParams({
+					grant_type: "authorization_code",
+					code,
+				}),
+			)
+			.post()
+			.json<EpicTokenResponse>()
+			.catch((e) => {
+				console.error(e);
+				throw DiscordApiErrors.GENERAL_ERROR;
+			});
+	}
+
+	async getUser(token: string): Promise<UserResponse[]> {
+		const { sub } = JSON.parse(
+			Buffer.from(token.split(".")[1], "base64").toString("utf8"),
+		);
+		const url = new URL(this.userInfoUrl);
+		url.searchParams.append("accountId", sub);
+
+		return wretch(url.toString())
+			.headers({
+				Authorization: `Bearer ${token}`,
+			})
+			.get()
+			.json<UserResponse[]>()
+			.catch((e) => {
+				console.error(e);
+				throw DiscordApiErrors.GENERAL_ERROR;
+			});
+	}
+
+	async handleCallback(
+		params: ConnectionCallbackSchema,
+	): Promise<ConnectedAccount | null> {
+		const userId = this.getUserId(params.state);
+		const tokenData = await this.exchangeCode(params.state, params.code!);
+		const userInfo = await this.getUser(tokenData.access_token);
+
+		const exists = await this.hasConnection(userId, userInfo[0].accountId);
+
+		if (exists) return null;
+
+		return await this.createConnection({
+			user_id: userId,
+			external_id: userInfo[0].accountId,
+			friend_sync: params.friend_sync,
+			name: userInfo[0].displayName,
+			type: this.id,
+		});
+	}
+}