Limit the size of the sending file (#376)

* Limit the size of the sending file

* limit vedio size

* add remark

* tslint

* Optimize videoMaxSize limit

* tslint

src/puppet-web/puppet-web.ts

@@ -353,6 +353,12 @@ export class PuppetWeb extends Puppet {
       }))
     })
 
+    // Sending video files is not allowed to exceed 20MB
+    // https://github.com/Chatie/webwx-app-tracker/blob/7c59d35c6ea0cff38426a4c5c912a086c4c512b2/formatted/webwxApp.js#L1115
+    const videoMaxSize = 20 * 1024 * 1024
+    if (mediatype === 'video' && buffer.length > videoMaxSize)
+      throw new Error(`Sending video files is not allowed to exceed ${videoMaxSize / 1024 / 1024}MB`)
+
     let md5 = UtilLib.md5(buffer)
 
     let baseRequest = await this.getBaseRequest()