reddit session handling

package-lock.json

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+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -2783,6 +3064,14 @@
         "once": "^1.3.1"
       }
     },
+    "qs": {
+      "version": "6.11.2",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.2.tgz",
+      "integrity": "sha512-tDNIz22aBzCDxLtVH++VnTfzxlfeK5CbqohpSqpJgj1Wg/cQbStNAz3NuqCs5vV+pjBsK4x4pN9HlVh7rcYRiA==",
+      "requires": {
+        "side-channel": "^1.0.4"
+      }
+    },
     "rc": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
@@ -2850,6 +3139,30 @@
       "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
       "optional": true
     },
+    "set-function-length": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.1.tgz",
+      "integrity": "sha512-j4t6ccc+VsKwYHso+kElc5neZpjtq9EnRICFZtWyBsLojhmeF/ZBd/elqm22WJh/BziDe/SBiOeAt0m2mfLD0g==",
+      "requires": {
+        "define-data-property": "^1.1.2",
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2",
+        "get-intrinsic": "^1.2.3",
+        "gopd": "^1.0.1",
+        "has-property-descriptors": "^1.0.1"
+      }
+    },
+    "side-channel": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.6.tgz",
+      "integrity": "sha512-fDW/EZ6Q9RiO8eFG8Hj+7u/oW+XrPTIChwCOM2+th2A6OblDtYYIpve9m+KvI9Z4C9qSEXlaGR6bTEYHReuglA==",
+      "requires": {
+        "call-bind": "^1.0.7",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.4",
+        "object-inspect": "^1.13.1"
+      }
+    },
     "signal-exit": {
       "version": "3.0.7",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",

package.json

@@ -7,6 +7,7 @@
     "form-data": "^4.0.0",
     "fs": "^0.0.1-security",
     "path": "^0.12.7",
+    "qs": "^6.11.2",
     "sqlite": "^5.1.1",
     "sqlite3": "^5.1.7"
   },

src/db/migrations/004_create_oauth_tokens_table.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS oauth_tokens (
+    id INTEGER PRIMARY KEY,
+    token_identifier TEXT NOT NULL UNIQUE, -- Static identifier for the OAuth token
+    access_token TEXT NOT NULL,
+    token_type TEXT NOT NULL,
+    expires_in INTEGER NOT NULL,
+    expiry_timestamp INTEGER NOT NULL,
+    scope TEXT NOT NULL
+);

src/db/services/database.ts

@@ -122,4 +122,46 @@ export class DatabaseService {
             WHERE datetime(created_utc, 'unixepoch') < datetime('now', '-${days} days')
         `);
     }
+
+    /**
+     * Inserts or updates the OAuth token in the database.
+     * 
+     * @param {string} token_identifier - The baseurl for the axios instance.
+     * @param {Object} tokenData - The OAuth token data.
+     */
+    async upsertOAuthToken(token_identifier: string, tokenData: any) {
+        const { access_token, token_type, expires_in, scope } = tokenData;
+        const expiryTimestamp = Math.floor(Date.now() / 1000) + expires_in;
+        console.log('token_identifier', token_identifier)
+        console.log('access_token', access_token)
+        console.log('token_type', token_type)
+        console.log('expires_in', expires_in)
+        console.log('scope', scope)
+
+        await this.db.run(`
+        INSERT INTO oauth_tokens (token_identifier, access_token, token_type, expires_in, expiry_timestamp, scope)
+        VALUES (?, ?, ?, ?, ?, ?)
+        ON CONFLICT(token_identifier) DO UPDATE SET
+        access_token = excluded.access_token,
+        token_type = excluded.token_type,
+        expires_in = excluded.expires_in,
+        expiry_timestamp = excluded.expiry_timestamp,
+        scope = excluded.scope
+    `, [token_identifier, access_token, token_type, expires_in, expiryTimestamp, scope]);
+    }
+
+    /**
+     * Retrieves the current OAuth token.
+     * @param {string} token_identifier - The baseurl for the axios instance.
+     * @returns {Promise<Object|null>} The current OAuth token data or null if expired or not found.
+     */
+    async getCurrentOAuthToken(token_identifier: string) {
+        const tokenRow = await this.db.get(`
+        SELECT access_token, token_type, scope, expiry_timestamp FROM oauth_tokens
+        WHERE token_identifier = ?
+    `, token_identifier);
+
+        return tokenRow || null;
+    }
+
 }

src/index.ts

@@ -2,7 +2,8 @@ import dotenv from 'dotenv';
 dotenv.config();
 
 import WorkflowOrchestrator from './workflows/WorkflowOrchestrator';
-import SessionManager from './rdrama/session/SessionManager';
+import rDramaSession from './rdrama/session/SessionManager';
+import redditSession from './reddit/session/SessionManager';
 import { CommentParser } from './rdrama/services/CommentParser';
 import { DatabaseInitializer } from './db/initializeDatabase';
 import { DatabaseService } from './db/services/Database';
@@ -14,11 +15,11 @@ import { CommentPoster } from './rdrama/services/CommentPoster';
 
 async function startApplication() {
     // Initialize SessionManager or other global configurations
-    const sessionManager = SessionManager.getInstance();
+    const rDramaSessionManager = rDramaSession.getInstance();
     if (!process.env.RDRAMA_API_KEY) {
         throw new Error('RDRAMA_API_KEY is undefined. Please set this environment variable.');
     }
-    sessionManager.setAuthorizationToken(process.env.RDRAMA_API_KEY);
+    rDramaSessionManager.setAuthorizationToken(process.env.RDRAMA_API_KEY);
 
     const databaseInitializer = DatabaseInitializer.getInstance();
     const db = await databaseInitializer.getDbInstance()
@@ -30,6 +31,12 @@ async function startApplication() {
     console.log('Database Maintenance Start')
     await databaseMaintenance.runMaintenanceTasks()
 
+    const redditSessionManager = await redditSession.getInstance(databaseService)
+
+    const response = await redditSessionManager.axiosInstance.get('/me')
+
+    console.log(JSON.stringify(response.data, null, 4))
+
     // Initialize services with any required dependencies
     const commentFetcher = new CommentProcessor(databaseService);
     const commentParser = new CommentParser();

src/reddit/session/SessionManager.ts

@@ -0,0 +1,110 @@
+import axios, { AxiosInstance, AxiosError } from 'axios';
+const qs = require('qs');
+import dotenv from 'dotenv';
+import axiosRetry from 'axios-retry';
+import axiosThrottle from 'axios-request-throttle';
+import { DatabaseService } from '../../db/services/Database';
+
+dotenv.config();
+
+class RedditSessionManager {
+    private static instance: RedditSessionManager;
+    public axiosInstance: AxiosInstance;
+    private databaseService: DatabaseService;
+
+    private constructor(databaseService: DatabaseService) {
+        this.databaseService = databaseService;
+        axiosThrottle.use(axios, { requestsPerSecond: 1 }); // Throttle setup
+
+        this.axiosInstance = axios.create({
+            baseURL: 'https://oauth.reddit.com/api/v1/', // Base URL for OAuth2 Reddit API
+            headers: {
+                'User-Agent': 'CrossTalk PM/0.1 by Whitneywisconson'
+            }
+        });
+        axiosRetry(this.axiosInstance, {
+            retries: 3,
+            retryDelay: this.retryDelayStrategy,
+            retryCondition: this.retryCondition,
+        });
+    }
+
+    public static async getInstance(databaseService: DatabaseService): Promise<RedditSessionManager> {
+        if (!RedditSessionManager.instance) {
+            RedditSessionManager.instance = new RedditSessionManager(databaseService);
+            await RedditSessionManager.instance.initializeAuthentication();
+        }
+        return RedditSessionManager.instance;
+    }
+
+    private async initializeAuthentication() {
+        // Check the database for an existing token
+        const currentToken = await this.databaseService.getCurrentOAuthToken(this.axiosInstance.defaults.baseURL as string);
+        if (currentToken && new Date() < new Date(currentToken.expiry_timestamp * 1000)) {
+            this.axiosInstance.defaults.headers.common['Authorization'] = `Bearer ${currentToken.access_token}`;
+            console.log('Using existing Reddit API token from database.');
+            return;
+        }
+        console.log('No current Reddit API token from database requesting one')
+
+        // Authenticate with Reddit API to get a new token
+        await this.authenticate();
+    }
+
+    private async authenticate() {
+        if (!process.env.redditUsername) throw 'No Reddit Username Found in .env'
+        if (!process.env.redditPassword) throw 'No Reddit Password Found in .env'
+        const redditUsername = process.env.redditUsername as string
+        const redditPassword = process.env.redditPassword as string
+        const credentials = qs.stringify({
+            grant_type: 'password',
+            username: redditUsername,
+            password: redditPassword,
+        });
+
+        const authString = `${process.env.redditClientId}:${process.env.redditSecret}`;
+        const buffer = Buffer.from(authString);
+        const base64AuthString = buffer.toString('base64');
+
+        try {
+            const response = await this.axiosInstance.post('https://www.reddit.com/api/v1/access_token', credentials, {
+                headers: {
+                    'User-Agent': `CrossTalk PM/0.1 by ${redditUsername}`,  //TODO Dynamically set app name here
+                    'Authorization': `Basic ${base64AuthString}`,
+                    'Content-Type': 'application/x-www-form-urlencoded',
+                },
+            });
+
+            // Upsert the new token into the database
+            await this.databaseService.upsertOAuthToken(
+                this.axiosInstance.defaults.baseURL as string,
+                {
+                    access_token: response.data.access_token,
+                    token_type: response.data.token_type,
+                    expires_in: response.data.expires_in,
+                    scope: response.data.scope,
+                });
+
+            this.axiosInstance.defaults.headers.common['Authorization'] = `Bearer ${response.data.access_token}`;
+            console.log('Reddit API authenticated successfully.');
+        } catch (error) {
+            console.error('Error authenticating with Reddit API:', error);
+        }
+    }
+
+    private retryDelayStrategy(retryCount: number, error: AxiosError): number {
+        const retryAfter = error.response?.headers['retry-after'];
+        if (retryAfter) {
+            console.log(`429 Retry After: ${retryAfter}`);
+            return +retryAfter * 1000;
+        }
+        return Math.pow(2, retryCount) * 2000;
+    }
+
+    private retryCondition(error: AxiosError): boolean {
+        const status = error.response?.status ?? 0;
+        return status === 429 || status >= 400;
+    }
+}
+
+export default RedditSessionManager;