Since go1.8 os.RemoveAll and os.MkdirAll both support long
path names i.e UNC path on windows. The code we are carrying
was directly borrowed from `pkg/os` package and doesn't need
to be in our repo anymore. As a side affect this also
addresses our codecoverage issue.
Refer #4658
This commit fixes a potential security issue, whereby a full-access
token to the server would be available in the GET URL of a download
request. This fixes that issue by introducing short-expiry tokens, which
are only valid for one minute, and are regenerated for every download
request.
This commit specifically introduces the short-lived tokens, adds tests
for the tokens, adds an RPC call for generating a token given a
full-access token, updates the browser to use the new tokens for
requests where the token is passed as a GET parameter, and adds some
tests with the new temporary tokens.
Refs: https://github.com/minio/minio/pull/4673
Creds don't require secretKeyHash to be calculated
everytime, cache it instead and re-use.
This is an optimization for bcrypt.
Relevant results from the benchmark done locally, negative
value means improvement in this scenario.
```
benchmark old ns/op new ns/op delta
BenchmarkAuthenticateNode-4 160590992 80125647 -50.11%
BenchmarkAuthenticateWeb-4 160556692 80432144 -49.90%
benchmark old allocs new allocs delta
BenchmarkAuthenticateNode-4 87 75 -13.79%
BenchmarkAuthenticateWeb-4 87 75 -13.79%
benchmark old bytes new bytes delta
BenchmarkAuthenticateNode-4 15222 9785 -35.72%
BenchmarkAuthenticateWeb-4 15222 9785 -35.72%
```
This is a consolidation effort, avoiding usage
of naked strings in codebase. Whenever possible
use constants which can be repurposed elsewhere.
This also fixes `goconst ./...` reported issues.
