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Server-side code for accepting crash reports and feedback

akwizgran requested to merge 573-hidden-service-for-crash-reports-and-feedback into master
  • Moved some shared code for copying InputStreams to OutputStreams into a utility class
  • Modified the dev report sender to send one report per connection
    • Easier to handle on the server side
    • If the connection fails after sending any reports, they don't need to be resent
    • Tor will reuse the circuit, so it's cheap
  • Added server-side code for accepting dev reports
    • We need to protect the server's resources from DoS attacks
    • Reports can't be larger than 1 MB
    • Connections are limited to an average rate of one per minute
    • The rate limiter uses a token bucket to allow bursts of up to 1,000 connections
    • If the rate limit is exceeded, connection attempts will fail - clients will retry next time they sign in
    • The limits can be raised when we move to a bigger server (and when we have some users)

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