implement #253

src/routes/postClearCache.ts

@@ -0,0 +1,55 @@
+import { Logger } from '../utils/logger';
+import { db } from '../databases/databases';
+import { getHash } from '../utils/getHash';
+import { Request, Response } from 'express';
+import { Service, VideoID } from '../types/segments.model';
+import { QueryCacher } from '../utils/queryCacher';
+import { UserID } from '../types/user.model';
+
+export async function postClearCache(req: Request, res: Response) {
+    const videoID = req.query.videoID as VideoID;
+    let userID = req.query.userID as UserID;
+    let service = req.query.service as Service ?? Service.YouTube;
+
+    const invalidFields = [];
+    if (typeof videoID !== 'string') {
+      invalidFields.push('videoID');
+    }
+    if (typeof userID !== 'string') {
+      invalidFields.push('userID');
+    }
+
+    if (invalidFields.length !== 0) {
+      // invalid request
+      const fields = invalidFields.reduce((p, c, i) => p + (i !== 0 ? ', ' : '') + c, '');
+      res.status(400).send(`No valid ${fields} field(s) provided`);
+      return false;
+    }
+
+    // hash the userID
+    userID = getHash(userID);
+    // hash videoID
+    const hashedVideoID = getHash(videoID, 1);
+
+    const isVIP = (await db.prepare("get", `SELECT count(*) as "userCount" FROM "vipUsers" WHERE "userID" = ?`, [userID])).userCount > 0;
+    // Ensure user is a VIP
+    if (!isVIP) {
+        Logger.warn("Permission violation: User " + userID + " attempted to clear cache for video " + videoID + ".");
+        res.status(403).json({"message": "Not a VIP"});
+        return false;
+    }
+
+    try {
+        QueryCacher.clearVideoCache({
+            videoID,
+            hashedVideoID,
+            service
+        });
+        res.status(200).json({
+            message: "Cache cleared on video " + videoID
+        });
+    } catch(err) {
+        res.status(500).send()
+        return false;
+    }
+}

src/utils/queryCacher.ts

@@ -22,15 +22,14 @@ async function get<T>(fetchFromDB: () => Promise<T>, key: string): Promise<T> {
     return data;
 }
 
-function clearVideoCache(videoInfo: { videoID: VideoID; hashedVideoID: VideoIDHash; service: Service; userID: UserID; }) {
+function clearVideoCache(videoInfo: { videoID: VideoID; hashedVideoID: VideoIDHash; service: Service; userID?: UserID; }) {
     if (videoInfo) {
         redis.delAsync(skipSegmentsKey(videoInfo.videoID, videoInfo.service));
         redis.delAsync(skipSegmentsHashKey(videoInfo.hashedVideoID, videoInfo.service));
-        redis.delAsync(reputationKey(videoInfo.userID));
+        if (videoInfo.userID) redis.delAsync(reputationKey(videoInfo.userID));
     }
 }
 
-
 export const QueryCacher = {
     get,
     clearVideoCache