feat(reddit): add reddit integration

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

@@ -0,0 +1,26 @@
+import { IField, IGlobalVariable } from '@automatisch/types';
+import { URLSearchParams } from 'url';
+import authScope from '../common/auth-scope';
+
+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: $.auth.data.clientId as string,
+    response_type: 'code',
+    redirect_uri: redirectUri,
+    duration: 'permanent',
+    scope: authScope.join(' '),
+    state,
+  });
+
+  const url = `https://www.reddit.com/api/v1/authorize?${searchParams.toString()}`;
+
+  await $.auth.set({
+    url,
+    originalState: state,
+  });
+}

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

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+import generateAuthUrl from './generate-auth-url';
+import verifyCredentials from './verify-credentials';
+import refreshToken from './refresh-token';
+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/reddit/connections/add',
+      placeholder: null,
+      description:
+        'When asked to input a redirect URL in Reddit, 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,
+  refreshToken,
+};

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

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

packages/backend/src/apps/reddit/auth/refresh-token.ts

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+import { URLSearchParams } from 'node:url';
+import { IGlobalVariable } from '@automatisch/types';
+
+const refreshToken = async ($: IGlobalVariable) => {
+  const headers = {
+    Authorization: `Basic ${Buffer.from(
+      $.auth.data.clientId + ':' + $.auth.data.clientSecret
+    ).toString('base64')}`,
+  };
+  const params = new URLSearchParams({
+    grant_type: 'refresh_token',
+    refresh_token: $.auth.data.refreshToken as string,
+  });
+
+  const { data } = await $.http.post(
+    'https://www.reddit.com/api/v1/access_token',
+    params.toString(),
+    { headers }
+  );
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    expiresIn: data.expires_in,
+    scope: data.scope,
+    tokenType: data.token_type,
+  });
+};
+
+export default refreshToken;

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

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+import { IField, IGlobalVariable } from '@automatisch/types';
+import getCurrentUser from '../common/get-current-user';
+import { URLSearchParams } from 'url';
+
+const verifyCredentials = async ($: IGlobalVariable) => {
+  if ($.auth.data.originalState !== $.auth.data.state) {
+    throw new Error(`The 'state' parameter does not match.`);
+  }
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field: IField) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value as string;
+  const headers = {
+    Authorization: `Basic ${Buffer.from(
+      $.auth.data.clientId + ':' + $.auth.data.clientSecret
+    ).toString('base64')}`,
+  };
+  const params = new URLSearchParams({
+    grant_type: 'authorization_code',
+    code: $.auth.data.code as string,
+    redirect_uri: redirectUri,
+  });
+
+  const { data } = await $.http.post(
+    'https://www.reddit.com/api/v1/access_token',
+    params.toString(),
+    { headers }
+  );
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    tokenType: data.token_type,
+  });
+
+  const currentUser = await getCurrentUser($);
+  const screenName = currentUser?.name;
+
+  await $.auth.set({
+    clientId: $.auth.data.clientId,
+    clientSecret: $.auth.data.clientSecret,
+    scope: $.auth.data.scope,
+    expiresIn: data.expires_in,
+    refreshToken: data.refresh_token,
+    screenName,
+  });
+};
+
+export default verifyCredentials;