diff --git a/src/connections/Facebook/FacebookSettings.ts b/src/connections/Facebook/FacebookSettings.ts
new file mode 100644
index 00000000..cc3e3402
--- /dev/null
+++ b/src/connections/Facebook/FacebookSettings.ts
@@ -0,0 +1,5 @@
+export class FacebookSettings {
+ enabled: boolean = false;
+ clientId: string | null = null;
+ clientSecret: string | null = null;
+}
diff --git a/src/connections/Facebook/index.ts b/src/connections/Facebook/index.ts
new file mode 100644
index 00000000..80950a8e
--- /dev/null
+++ b/src/connections/Facebook/index.ts
@@ -0,0 +1,142 @@
+import {
+ Config,
+ ConnectedAccount,
+ ConnectionCallbackSchema,
+ ConnectionLoader,
+ DiscordApiErrors,
+} from "@fosscord/util";
+import fetch from "node-fetch";
+import Connection from "../../util/connections/Connection";
+import { FacebookSettings } from "./FacebookSettings";
+
+interface OAuthTokenResponse {
+ access_token: string;
+ token_type: string;
+ scope: string;
+ refresh_token?: string;
+ expires_in?: number;
+}
+
+export interface FacebookErrorResponse {
+ error: {
+ message: string;
+ type: string;
+ code: number;
+ fbtrace_id: string;
+ };
+}
+
+interface UserResponse {
+ name: string;
+ id: string;
+}
+
+export default class FacebookConnection extends Connection {
+ public readonly id = "facebook";
+ public readonly authorizeUrl =
+ "https://www.facebook.com/v14.0/dialog/oauth";
+ public readonly tokenUrl =
+ "https://graph.facebook.com/v14.0/oauth/access_token";
+ public readonly userInfoUrl = "https://graph.facebook.com/v14.0/me";
+ public readonly scopes = ["public_profile"];
+ settings: FacebookSettings = new FacebookSettings();
+
+ init(): void {
+ this.settings = ConnectionLoader.getConnectionConfig(
+ this.id,
+ this.settings,
+ ) as FacebookSettings;
+ }
+
+ 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("state", state);
+ url.searchParams.append("response_type", "code");
+ url.searchParams.append("scope", this.scopes.join(" "));
+ url.searchParams.append("display", "popup");
+ return url.toString();
+ }
+
+ getTokenUrl(code: string): string {
+ const url = new URL(this.tokenUrl);
+ url.searchParams.append("client_id", this.settings.clientId!);
+ url.searchParams.append("client_secret", this.settings.clientSecret!);
+ url.searchParams.append("code", code);
+ url.searchParams.append(
+ "redirect_uri",
+ `${
+ Config.get().cdn.endpointPrivate || "http://localhost:3001"
+ }/connections/${this.id}/callback`,
+ );
+ return url.toString();
+ }
+
+ async exchangeCode(state: string, code: string): Promise<string> {
+ this.validateState(state);
+
+ const url = this.getTokenUrl(code);
+
+ return fetch(url.toString(), {
+ method: "GET",
+ headers: {
+ Accept: "application/json",
+ },
+ })
+ .then((res) => res.json())
+ .then((res: OAuthTokenResponse & FacebookErrorResponse) => {
+ if (res.error) throw new Error(res.error.message);
+ return 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())
+ .then((res: UserResponse & FacebookErrorResponse) => {
+ if (res.error) throw new Error(res.error.message);
+ return res;
+ });
+ }
+
+ 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);
+
+ if (exists) return null;
+
+ return await this.createConnection({
+ user_id: userId,
+ external_id: userInfo.id,
+ friend_sync: params.friend_sync,
+ name: userInfo.name,
+ type: this.id,
+ });
+ }
+}
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