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import {
Config,
ConnectedAccount,
ConnectedAccountCommonOAuthTokenResponse,
ConnectionCallbackSchema,
ConnectionLoader,
DiscordApiErrors,
} from "@fosscord/util";
import fetch from "node-fetch";
import RefreshableConnection from "../../util/connections/RefreshableConnection";
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;
this.settings = ConnectionLoader.getConnectionConfig(
this.id,
this.settings,
) as SpotifySettings;
}
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<ConnectedAccountCommonOAuthTokenResponse> {
this.validateState(state);
const url = this.getTokenUrl();
return fetch(url.toString(), {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `Basic ${Buffer.from(
`${this.settings.clientId!}:${this.settings.clientSecret!}`,
).toString("base64")}`,
},
body: new URLSearchParams({
grant_type: "authorization_code",
code: code,
redirect_uri: `${
Config.get().cdn.endpointPrivate || "http://localhost:3001"
}/connections/${this.id}/callback`,
}),
})
.then((res) => res.json())
.then(
(
res: ConnectedAccountCommonOAuthTokenResponse &
TokenErrorResponse,
) => {
if (res.error) throw new Error(res.error_description);
return res;
},
)
.catch((e) => {
console.error(
`Error exchanging token for ${this.id} connection: ${e}`,
);
throw DiscordApiErrors.INVALID_OAUTH_TOKEN;
});
}
async refreshToken(connectedAccount: ConnectedAccount) {
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 fetch(url.toString(), {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `Basic ${Buffer.from(
`${this.settings.clientId!}:${this.settings.clientSecret!}`,
).toString("base64")}`,
},
body: new URLSearchParams({
grant_type: "refresh_token",
refresh_token,
}),
})
.then((res) => res.json())
.then(
(
res: ConnectedAccountCommonOAuthTokenResponse &
TokenErrorResponse,
) => {
if (res.error) throw new Error(res.error_description);
return res;
},
)
.catch((e) => {
console.error(
`Error refreshing 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 & ErrorResponse) => {
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 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({
token_data: tokenData,
user_id: userId,
external_id: userInfo.id,
friend_sync: params.friend_sync,
name: userInfo.display_name,
type: this.id,
});
}
}
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