Adam B created MESOS-4956:
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             Summary: Add authentication to /files endpoints
                 Key: MESOS-4956
                 URL: https://issues.apache.org/jira/browse/MESOS-4956
             Project: Mesos
          Issue Type: Improvement
          Components: HTTP API
            Reporter: Greg Mann
            Assignee: Greg Mann


In addition to the endpoints addressed by MESOS-4850, the following endpoints 
would also benefit from HTTP authentication:
* {{/files/*}}
* {{/profiler/*}}
* {{/logging/toggle}}
* {{/metrics/snapshot}}
* {{/monitor/statistics}}
* {{/system/stats.json}}


Adding HTTP authentication to these endpoints is a bit more complicated: some 
endpoints are defined at the libprocess level, while others are defined in code 
that is shared by the master and agent.

While working on MESOS-4850, it became apparent that since our tests use the 
same instance of libprocess for both master and agent, different default 
authentication realms must be used for master/agent so that HTTP authentication 
can be independently enabled/disabled for each.

We should establish a mechanism for making an endpoint authenticated that 
allows us to:
1) Install an endpoint like {{/files}}, whose code is shared by the master and 
agent, with different authentication realms for the master and agent
2) Avoid hard-coding a default authentication realm into libprocess, to permit 
the use of different authentication realms for the master and agent and to keep 
application-level concerns from leaking into libprocess

Another option would be to use a single default authentication realm and always 
enable or disable HTTP authentication for *both* the master and agent in tests. 
However, this wouldn't allow us to test scenarios where HTTP authentication is 
enabled on one but disabled on the other.



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