Custom oauth lib

The package used is deprecated. And I want to be able to debug oauth errors better.

src/utils/oauth2.ts

@@ -0,0 +1,124 @@
+type ClientOptions = {
+  clientId: string
+  clientSecret: string
+  clientToken: string
+  redirectUri: string
+  credentials: string
+};
+
+type GenerateUrlParameters = {
+  state: string
+  scope: string[]
+  type: 'code' | 'token'
+};
+
+type TokenResponse = {
+  access_token: string
+  token_type: string
+  expires_in: number
+  refresh_token: string
+  scope: string
+}
+
+type DiscordUser = {
+  id: string
+  username: string
+  // bunch of other stuff we don't use
+}
+
+type AddMemberOptions = {
+  accessToken: string
+  botToken?: string
+  guildId: string
+  userId: string
+  nickname?: string
+}
+
+const OAUTH_BASE_URL = 'https://discord.com/oauth2';
+const OAUTH_API_BASE_URL = 'https://discord.com/api/oauth2';
+const API_BASE_URL = 'https://discord.com/api';
+
+export class DiscordOAuth2 {
+  constructor(private options: ClientOptions) { }
+
+  generateOauth2Url(options: GenerateUrlParameters) {
+    const url = new URL(`${OAUTH_BASE_URL}/authorize`);
+
+    const params = new URLSearchParams({
+      client_id: this.options.clientId,
+      response_type: options.type,
+      redirect_uri: this.options.redirectUri,
+      scope: options.scope.join('+'),
+      state: options.state
+    });
+
+    url.search = params.toString();
+
+    return url.toString();
+  }
+
+  async getAccessToken(code: string, scope: string[]): Promise<TokenResponse> {
+    const res = await fetch(`${OAUTH_API_BASE_URL}/token`, {
+      method: 'POST',
+      body: new URLSearchParams({
+        client_id: this.options.clientId,
+        client_secret: this.options.clientSecret,
+        code,
+        grant_type: 'authorization_code',
+        redirect_uri: this.options.redirectUri,
+        scope: scope.join(' ')
+      }).toString(),
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+        Accept: 'application/json'
+      }
+    });
+
+    const data = await res.json();
+    return data as TokenResponse;
+  }
+
+  async getUser(accessToken: string): Promise<DiscordUser> {
+    const res = await fetch(`${API_BASE_URL}/users/@me`, {
+      headers: {
+        Authorization: `Bearer ${accessToken}`,
+        Accept: 'application/json'
+      }
+    });
+
+    return await res.json() as DiscordUser;
+  }
+
+  async addMember(options: AddMemberOptions) {
+    const res = await fetch(`${API_BASE_URL}/guilds/${options.guildId}/members/${options.userId}`, {
+      method: 'PUT',
+      body: JSON.stringify({
+        nick: options.nickname,
+        access_token: options.accessToken
+      }),
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bot ${this.options.clientToken}`,
+        Accept: 'application/json'
+      }
+    });
+
+    return await res.json();
+  }
+
+  async revokeToken(token: string) {
+    const res = await fetch(`${OAUTH_API_BASE_URL}/token/revoke`, {
+      method: 'POST',
+      body: new URLSearchParams({
+        token
+      }).toString(),
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+        Authorization: `Basic ${this.options.credentials}`,
+        Accept: 'application/json'
+      }
+    });
+
+    return await res.json();
+  }
+}