Introduce "Error and Uncaught Exception Reporting" for GLClient

[fpietrosanti]

This ticket is about the implementation of a stack exception handler, to detect GLClient errors, into the GLClient.

The Stack Exception handler should detect any uncaught javascript exception or major error and:

• Show it on a dedicated debug UI to the end-user, saying that there is an error in the client and should be reported
• When a connection didn't went trough and/or timed out
• Let the user to click "Send error"

When the user click "Send error", the GLC will send the error including the end-user browser information to a GlobaLeaks backend REST API that will send the message to the admin.

This would extremely facilitate crowd-spotting of GLClient bugs that are very nasty to be identified, because they reside on end-user side.

We should consider to send errors automatically, without asking the end-user.

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[fpietrosanti]

Remote Javascript Error Reporting library https://github.com/Offbeatmammal/jsErrLog

Remote Javascript Error Reporting Services (with obvious privacy concerns + costs):

• Sentry https://docs.getsentry.com/hosted/
• AirBrake https://airbrake.io/blog/notifier/state-client-side-javascript-error-reporting

/cc @evilaliv3

[fpietrosanti]

https://stackoverflow.com/questions/119432/logging-clientside-javascript-errors-on-server

[evilaliv3]

last two comments are taken not useful at all.

lercio.it provides more related info :)

[fpietrosanti]

@evilaliv3 it's basically what we need, but in a SAAS mode, that's compatible with us for development purposes but not for production due to concern about whistleblower privacy