feat: implement Spotify connection

packages/backend/src/apps/spotify/auth/generate-auth-url.ts

@@ -0,0 +1,27 @@
+import { IField, IGlobalVariable } from '@automatisch/types';
+import { URLSearchParams } from 'url';
+import scopes from '../common/scopes';
+
+export default async function generateAuthUrl($: IGlobalVariable) {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field: IField) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value as string;
+  const state = Math.random().toString() as string;
+
+  const searchParams = new URLSearchParams({
+    client_id: $.auth.data.clientId as string,
+    client_secret: $.auth.data.clientSecret as string,
+    grant_type: 'client_credentials',
+    redirect_uri: redirectUri,
+    response_type: 'code',
+    scope: scopes.join(','),
+    state: state,
+  });
+
+  const url = `https://accounts.spotify.com/authorize?${searchParams}`;
+
+  await $.auth.set({
+    url,
+  });
+}

packages/backend/src/apps/spotify/auth/index.ts

@@ -0,0 +1,45 @@
+import generateAuthUrl from './generate-auth-url';
+import verifyCredentials from './verify-credentials';
+import isStillVerified from './is-still-verified';
+
+export default {
+  fields: [
+    {
+      key: 'oAuthRedirectUrl',
+      label: 'OAuth Redirect URL',
+      type: 'string' as const,
+      required: true,
+      readOnly: true,
+      value: '{WEB_APP_URL}/app/spotify/connections/add',
+      placeholder: null,
+      description:
+        'When asked to input an OAuth callback or redirect URL in Spotify OAuth, enter the URL above.',
+      clickToCopy: true,
+    },
+    {
+      key: 'clientId',
+      label: 'Client Id',
+      type: 'string' as const,
+      required: true,
+      readOnly: false,
+      value: null,
+      placeholder: null,
+      description: null,
+      clickToCopy: false,
+    },
+    {
+      key: 'clientSecret',
+      label: 'Client Secret',
+      type: 'string' as const,
+      required: true,
+      readOnly: false,
+      value: null,
+      placeholder: null,
+      description: null,
+      clickToCopy: false,
+    },
+  ],
+  generateAuthUrl,
+  verifyCredentials,
+  isStillVerified,
+};

packages/backend/src/apps/spotify/auth/is-still-verified.ts

@@ -0,0 +1,9 @@
+import { IGlobalVariable } from '@automatisch/types';
+import getCurrentUser from '../common/get-current-user';
+
+const isStillVerified = async ($: IGlobalVariable) => {
+  const user = await getCurrentUser($);
+  return !!user.id;
+};
+
+export default isStillVerified;

packages/backend/src/apps/spotify/auth/verify-credentials.ts

@@ -0,0 +1,53 @@
+import { IGlobalVariable } from '@automatisch/types';
+import getCurrentUser from '../common/get-current-user';
+import { URLSearchParams } from 'url';
+
+const verifyCredentials = async ($: IGlobalVariable) => {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value as string;
+  const params = new URLSearchParams({
+    code: $.auth.data.code as string,
+    redirect_uri: redirectUri,
+    grant_type: 'authorization_code',
+  });
+
+  const headers = {
+    Authorization: `Basic ${Buffer.from(
+      $.auth.data.clientId + ':' + $.auth.data.clientSecret
+    ).toString('base64')}`,
+    'Content-Type': 'application/x-www-form-urlencoded',
+  };
+
+  const response = await $.http.post(
+    'https://accounts.spotify.com/api/token',
+    params.toString(),
+    { headers }
+  );
+
+  const {
+    access_token: accessToken,
+    refresh_token: refreshToken,
+    expires_in: expiresIn,
+    scope: scope,
+    token_type: tokenType,
+  } = response.data;
+
+  await $.auth.set({
+    accessToken,
+    refreshToken,
+    expiresIn,
+    scope,
+    tokenType,
+  });
+
+  const user = await getCurrentUser($);
+
+  await $.auth.set({
+    userId: user.id,
+    screenName: user.display_name,
+  });
+};
+
+export default verifyCredentials;