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Autostart native signing application

Pavlos Karakalidis requested to merge pkarakal/universis-teachers:254-autostart-native-app into master

This MR makes the front end try to autostart the native signing application. If the app is not running (the front end fails to establish a websocket connection), the front end sends a browser native message and if the grade signing extension is installed on the browser it starts the application. If not, it tries 2 more times and if it fails it gives the user the previous prompt to open the application manually. When sending the native message, the thread sleeps for 3 seconds (await new Promise(resolve => setTimeout(resolve, 3000)) while waiting for the executable to launch. This is done to prevent, multiple instances of the native app running.

The flow can be seen here

  • If the extension is present

Peek_2020-06-04_11-04

  • If the extension is absent

Peek_2020-06-04_11-06

Closes #254 (closed)

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