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/*
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,
RefreshableConnection,
} from "@spacebar/util";
import wretch from "wretch";
import { SpotifySettings } from "./SpotifySettings";
export interface UserResponse {
display_name: string;
id: string;
}
export interface TokenErrorResponse {
error: string;
error_description: string;
}
export interface ErrorResponse {
error: {
status: number;
message: string;
};
}
export default class SpotifyConnection extends RefreshableConnection {
public readonly id = "spotify";
public readonly authorizeUrl = "https://accounts.spotify.com/authorize";
public readonly tokenUrl = "https://accounts.spotify.com/api/token";
public readonly userInfoUrl = "https://api.spotify.com/v1/me";
public readonly scopes = [
"user-read-private",
"user-read-playback-state",
"user-modify-playback-state",
"user-read-currently-playing",
];
settings: SpotifySettings = new SpotifySettings();
init(): void {
/**
* The way Discord shows the currently playing song is by using Spotifys partner API. This is obviously not possible for us.
* So to prevent spamming the spotify api we disable the ability to refresh.
*/
this.refreshEnabled = false;
const settings = ConnectionLoader.getConnectionConfig<SpotifySettings>(
this.id,
this.settings,
);
if (settings.enabled && (!settings.clientId || !settings.clientSecret))
throw new Error(`Invalid settings for connection ${this.id}`);
}
getAuthorizationUrl(userId: string): string {
const state = this.createState(userId);
const url = new URL(this.authorizeUrl);
url.searchParams.append("client_id", this.settings.clientId as string);
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<ConnectedAccountCommonOAuthTokenResponse> {
this.validateState(state);
const url = this.getTokenUrl();
return wretch(url.toString())
.headers({
Accept: "application/json",
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `Basic ${Buffer.from(
`${this.settings.clientId as string}:${
this.settings.clientSecret as string
}`,
).toString("base64")}`,
})
.body(
new URLSearchParams({
grant_type: "authorization_code",
code: code,
redirect_uri: this.getRedirectUri(),
}),
)
.post()
.json<ConnectedAccountCommonOAuthTokenResponse>()
.catch((e) => {
console.error(e);
throw DiscordApiErrors.GENERAL_ERROR;
});
}
async refreshToken(
connectedAccount: ConnectedAccount,
): Promise<ConnectedAccountCommonOAuthTokenResponse> {
if (!connectedAccount.token_data?.refresh_token)
throw new Error("No refresh token available.");
const refresh_token = connectedAccount.token_data.refresh_token;
const url = this.getTokenUrl();
return wretch(url.toString())
.headers({
Accept: "application/json",
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `Basic ${Buffer.from(
`${this.settings.clientId as string}:${
this.settings.clientSecret as string
}`,
).toString("base64")}`,
})
.body(
new URLSearchParams({
grant_type: "refresh_token",
refresh_token,
}),
)
.post()
.unauthorized(async () => {
// assume the token was revoked
await connectedAccount.revoke();
return DiscordApiErrors.CONNECTION_REVOKED;
})
.json<ConnectedAccountCommonOAuthTokenResponse>()
.catch((e) => {
console.error(e);
throw DiscordApiErrors.GENERAL_ERROR;
});
}
async getUser(token: string): Promise<UserResponse> {
const url = new URL(this.userInfoUrl);
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 { state, code } = params;
if (!code) throw new Error("No code provided");
const userId = this.getUserId(state);
const tokenData = await this.exchangeCode(state, 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({
token_data: { ...tokenData, fetched_at: Date.now() },
user_id: userId,
external_id: userInfo.id,
friend_sync: params.friend_sync,
name: userInfo.display_name,
type: this.id,
});
}
}
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