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import {
Config,
ConnectedAccount,
ConnectedAccountCommonOAuthTokenResponse,
ConnectionCallbackSchema,
ConnectionLoader,
DiscordApiErrors,
} from "@fosscord/util";
import fetch from "node-fetch";
import Connection from "../../util/connections/Connection";
import { DiscordSettings } from "./DiscordSettings";
interface UserResponse {
id: string;
username: string;
discriminator: string;
avatar_url: string | null;
}
export default class DiscordConnection extends Connection {
public readonly id = "discord";
public readonly authorizeUrl = "https://discord.com/api/oauth2/authorize";
public readonly tokenUrl = "https://discord.com/api/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(): string {
return this.tokenUrl;
}
async exchangeCode(
state: string,
code: string,
): Promise<ConnectedAccountCommonOAuthTokenResponse> {
this.validateState(state);
const url = this.getTokenUrl();
return fetch(url, {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/x-www-form-urlencoded",
},
body: new URLSearchParams({
client_id: this.settings.clientId!,
client_secret: this.settings.clientSecret!,
grant_type: "authorization_code",
code: code,
redirect_uri: `${
Config.get().cdn.endpointPrivate || "http://localhost:3001"
}/connections/${this.id}/callback`,
}),
})
.then((res) => res.json())
.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 ${token}`,
},
}).then((res) => res.json());
}
async handleCallback(
params: ConnectionCallbackSchema,
): Promise<ConnectedAccount | null> {
const userId = this.getUserId(params.state);
const tokenData = await this.exchangeCode(params.state, params.code!);
const userInfo = await this.getUser(tokenData.access_token);
const exists = await this.hasConnection(userId, userInfo.id);
if (exists) return null;
return await this.createConnection({
user_id: userId,
external_id: userInfo.id,
friend_sync: params.friend_sync,
name: `${userInfo.username}#${userInfo.discriminator}`,
type: this.id,
});
}
}
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