This patch removes the /api/v1/log/entries/{uuid}/proof endpoint. If you
have the UUID (aka the leaf Merkle hash), you likely want proof that the
content represented by that hash is included in the log. There's no need
for a separate /proof endpoint to deliver the same content.

This commit also ensures that the getLogEntryByIndex and
getLogEntryByUUID endpoints return an inclusion proof as part of their
response content. The search endpoint also now returns the inclusion
proof of all entries returned from the query.

With this patch, Rekor no longer uses the deprecated `GetLeavesByHash`
Trillian API.

Fixes #229

Signed-off-by: Bob Callaway <bob.callaway@gmail.com>

Adds a Location response header when a 409 Conflict error is returned
from the server when a duplicate entry is sent for insertion into the
log. Also changes message printed by CLI to improve usability.

Fixes #222

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Co-authored-by: Dan Lorenc <dlorenc@google.com>

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

* add endpoint for public key and return signed tree head with loginfo

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Introduce swagger UI server

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Co-authored-by: Bob Callaway <bcallawa@redhat.com>

also adds --log-index parameter to CLI verify command

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

We can't insert a blank entry, so mark request body as required.

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

- adds trillian API object to context
- improves request error logging pre and post validation
- use consistent request context throughout all GRPC calls
- improve validation of incoming UUID values
- disable swagger UI endpoint
- only print cacheable headers if response code is HTTP 2XX
- use GetLeavesByRange instead of deprecated GetLeavesByIndex API

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

* add xml & yaml format support

* add attributes to denote files that are generated so GH skips them on diffs