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import fetch from "node-fetch";
import {
Config,
ConnectedAccount,
ConnectionCallbackSchema,
DiscordApiErrors,
ConnectionLoader,
} from "@fosscord/util";
import Connection from "../../util/connections/Connection";
import { DiscordSettings } from "./DiscordSettings";
interface OAuthTokenResponse {
access_token: string;
token_type: string;
scope: string;
refresh_token?: string;
expires_in?: number;
}
interface UserResponse {
id: string;
username: string;
avatar_url: string | null;
}
export default class DiscordConnection extends Connection {
public readonly id = "discord";
public readonly authorizeUrl = "https://discord.com/oauth2/authorize";
public readonly tokenUrl = "https://discord.com/oauth2/token";
public readonly userInfoUrl = "https://discord.com/api/users/@me";
public readonly scopes = ["identify"];
settings: DiscordSettings = new DiscordSettings();
init(): void {
this.settings = ConnectionLoader.getConnectionConfig(
this.id,
this.settings,
) as DiscordSettings;
}
getAuthorizationUrl(userId: string): string {
const state = this.createState(userId);
const url = new URL(this.authorizeUrl);
url.searchParams.append("state", state);
url.searchParams.append("client_id", this.settings.clientId!);
url.searchParams.append("scope", this.scopes.join(" "));
url.searchParams.append("response_type", "code");
// controls whether, on repeated authorizations, the consent screen is shown
url.searchParams.append("consent", "none");
// 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`,
);
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("grant_type", "authorization_code");
url.searchParams.append("code", code);
return url.toString();
}
async exchangeCode(state: string, code: string): Promise<string> {
this.validateState(state);
const url = this.getTokenUrl(code);
return fetch(url, {
method: "POST",
headers: {
Accept: "application/json",
},
})
.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);
if (exists) return null;
return await this.createConnection({
user_id: userId,
external_id: userInfo.id,
friend_sync: params.friend_sync,
name: userInfo.username,
type: this.id,
})
}
}
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