Add reddit connection

2 files changed, 145 insertions, 0 deletions

diff --git a/src/connections/Reddit/RedditSettings.ts b/src/connections/Reddit/RedditSettings.ts
new file mode 100644
index 00000000..13208fb5
--- /dev/null
+++ b/src/connections/Reddit/RedditSettings.ts
@@ -0,0 +1,5 @@
+export class RedditSettings {
+	enabled: boolean = false;
+	clientId: string | null = null;
+	clientSecret: string | null = null;
+}
diff --git a/src/connections/Reddit/index.ts b/src/connections/Reddit/index.ts
new file mode 100644
index 00000000..c529cfa3
--- /dev/null
+++ b/src/connections/Reddit/index.ts
@@ -0,0 +1,140 @@
+import {
+	Config,
+	ConnectedAccount,
+	ConnectionCallbackSchema,
+	ConnectionLoader,
+	DiscordApiErrors,
+} from "@fosscord/util";
+import fetch from "node-fetch";
+import Connection from "../../util/connections/Connection";
+import { RedditSettings } from "./RedditSettings";
+
+interface OAuthTokenResponse {
+	access_token: string;
+	token_type: string;
+	scope: string;
+	refresh_token?: string;
+	expires_in?: number;
+}
+
+export interface UserResponse {
+	verified: boolean;
+	coins: number;
+	id: string;
+	is_mod: boolean;
+	has_verified_email: boolean;
+	total_karma: number;
+	name: string;
+	created: number;
+	gold_creddits: number;
+	created_utc: number;
+}
+
+export interface ErrorResponse {
+	message: string;
+	error: number;
+}
+
+export default class RedditConnection extends Connection {
+	public readonly id = "reddit";
+	public readonly authorizeUrl = "https://www.reddit.com/api/v1/authorize";
+	public readonly tokenUrl = "https://www.reddit.com/api/v1/access_token";
+	public readonly userInfoUrl = "https://oauth.reddit.com/api/v1/me";
+	public readonly scopes = ["identity"];
+	settings: RedditSettings = new RedditSettings();
+
+	init(): void {
+		this.settings = ConnectionLoader.getConnectionConfig(
+			this.id,
+			this.settings,
+		) as RedditSettings;
+	}
+
+	getAuthorizationUrl(userId: string): string {
+		const state = this.createState(userId);
+		const url = new URL(this.authorizeUrl);
+
+		url.searchParams.append("client_id", this.settings.clientId!);
+		// TODO: probably shouldn't rely on cdn as this could be different from what we actually want. we should have an api endpoint setting.
+		url.searchParams.append(
+			"redirect_uri",
+			`${
+				Config.get().cdn.endpointPrivate || "http://localhost:3001"
+			}/connections/${this.id}/callback`,
+		);
+		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<string> {
+		this.validateState(state);
+
+		const url = this.getTokenUrl();
+
+		return fetch(url.toString(), {
+			method: "POST",
+			headers: {
+				Accept: "application/json",
+				Authorization: `Basic ${Buffer.from(
+					`${this.settings.clientId}:${this.settings.clientSecret}`,
+				).toString("base64")}`,
+				"Content-Type": "application/x-www-form-urlencoded",
+			},
+			body: new URLSearchParams({
+				grant_type: "authorization_code",
+				code: code,
+				redirect_uri: `${
+					Config.get().cdn.endpointPrivate || "http://localhost:3001"
+				}/connections/${this.id}/callback`,
+			}),
+		})
+			.then((res) => res.json())
+			.then((res: OAuthTokenResponse) => res.access_token)
+			.catch((e) => {
+				console.error(
+					`Error exchanging token for ${this.id} connection: ${e}`,
+				);
+				throw DiscordApiErrors.INVALID_OAUTH_TOKEN;
+			});
+	}
+
+	async getUser(token: string): Promise<UserResponse> {
+		const url = new URL(this.userInfoUrl);
+		return fetch(url.toString(), {
+			method: "GET",
+			headers: {
+				Authorization: `Bearer ${token}`,
+			},
+		}).then((res) => res.json());
+	}
+
+	async handleCallback(
+		params: ConnectionCallbackSchema,
+	): Promise<ConnectedAccount | null> {
+		const userId = this.getUserId(params.state);
+		const token = await this.exchangeCode(params.state, params.code!);
+		const userInfo = await this.getUser(token);
+
+		const exists = await this.hasConnection(userId, userInfo.id.toString());
+
+		if (exists) return null;
+
+		// TODO: connection metadata
+
+		return await this.createConnection({
+			access_token: token,
+			user_id: userId,
+			external_id: userInfo.id.toString(),
+			friend_sync: params.friend_sync,
+			name: userInfo.name,
+			verified: userInfo.has_verified_email,
+			type: this.id,
+		});
+	}
+}