chore: Extract authentication logic of the apps to their own classes

packages/backend/src/apps/twitter/authentication.ts

@@ -0,0 +1,56 @@
+import TwitterApi from 'twitter-api-v2';
+import App from '../../models/app';
+import Field from '../../types/field';
+
+export default class Authentication {
+  client: any
+  connectionData: any
+  appData: any
+
+  constructor(connectionData: any) {
+    this.client = new TwitterApi({
+      appKey: connectionData.consumerKey,
+      appSecret: connectionData.consumerSecret,
+      accessToken: connectionData.accessToken,
+      accessSecret: connectionData.accessSecret
+    });
+
+    this.connectionData = connectionData;
+    this.appData = App.findOneByKey('twitter');
+  }
+
+  async createAuthData() {
+    const appFields = this.appData.fields.find((field: Field) => field.key == 'oAuthRedirectUrl')
+    const callbackUrl = appFields.value;
+
+    const authLink = await this.client.generateAuthLink(callbackUrl);
+
+    return {
+      url: authLink.url,
+      accessToken: authLink.oauth_token,
+      accessSecret: authLink.oauth_token_secret,
+    }
+  }
+
+  async verifyCredentials() {
+    const verifiedCredentials = await this.client.login(this.connectionData.oauthVerifier)
+
+    return {
+      consumerKey: this.connectionData.consumerKey,
+      consumerSecret: this.connectionData.consumerSecret,
+      accessToken: verifiedCredentials.accessToken,
+      accessSecret: verifiedCredentials.accessSecret,
+      userId: verifiedCredentials.userId,
+      screenName: verifiedCredentials.screenName
+    }
+  }
+
+  async isStillVerified() {
+    try {
+      await this.client.currentUser();
+      return true;
+    } catch {
+      return false
+    }
+  }
+}