Update oauth errors to use api errors

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

Add a new Match method to the reference package

Add OAuth error for client

Allow clients to handle errors being set in the WWW-Authenticate
rather than in the body. The WWW-Authenticate errors give a
more precise error describing what is needed to authorize
with the server.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

Split challenges into its own package. Avoids possible
import cycle with challenges from client.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

The Match method allows to see if a reference matches a specified
patterns.
Signed-off-by: Vincent Demeester <vincent@sbr.pm>

digest: Preserve tag and digest in With* functions

When WithDigest is called on a reference that has a tag, it should
preserve the tag.

When WithTag is called on a reference that has digest, it should
preserve the digest.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

Update vendored azure-sdk-for-go

Updating to a recent version of Azure Storage SDK to be
able to patch some memory leaks through configurable HTTP client
changes which were made possible by recent patches to it.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

Honor X-Forwarded-Port header

Add targets for Makefile

Prefer non-standard headers like X-Forwarded-Proto, X-Forwarded-Host and
X-Forwarded-Port over the standard Forwarded header to maintain
backwards compatibility.

If a port is not specified neither in Host nor in forwarded headers but
it is specified just with X-Forwarded-Port, use its value in base urls
for redirects.

Forwarded header is defined in rfc7239.

X-Forwarded-Port is a non-standard header. Here's a description copied
from "HTTP Headers and Elastic Load Balancing" of AWS ELB docs:

> The X-Forwarded-Port request header helps you identify the port that
> an HTTP or HTTPS load balancer uses to connect to the client.
Signed-off-by: Michal Minář <miminar@redhat.com>

Bump to go1.7

Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>

Ref: #2027
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

driver/swift: Fix go vet warning

Driver was passing connections by copying. Storing
`swift.Connection` as pointer to fix the warnings.

Ref: #2030.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

storagedriver/azure: close leaking response body

In GetContent() we read the bytes from a blob but do not close
the underlying response body.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

Remove Jenkinsfile used for docs CI

Signed-off-by: Joao Fernandes <joao.fernandes@docker.com>

optimize oss copy action when push upload finished.

Signed-off-by: yaoyao.xyy <yaoyao.xyy@alibaba-inc.com>

registry/client: set Accept: identity header when getting layers

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

manifest: references should cover all children

To allow generic manifest walking, we define an interface method of
`References` that returns the referenced items in the manifest. The
current implementation does not return the config target from schema2,
making this useless for most applications.

The garbage collector has been modified to show the utility of this
correctly formed `References` method. We may be able to make more
generic traversal methods with this, as well.
Signed-off-by: Stephen J Day <stephen.day@docker.com>

Fix broken doc links

Added new us-east-2 region for S3

storage/garbagecollect: add emit comments for when dryRun is false

Signed-off-by: Matt Bentley <mbentley@mbentley.net>

Signed-off-by: Jihoon Chung <jihoon@gmail.com>

Allow using ec2 roles when specifying region endpoint

Nwt fix s3 goamz & Aliyun OSS delete

Fix documentation typo

Deleting "/a" was deleting "/a/b" but also "/ab".
Signed-off-by: Richard Scothern <richard.scothern@docker.com>

Deleting "/a" was deleting "/a/b" but also "/ab".
Signed-off-by: Noah Treuhaft <noah.treuhaft@docker.com>

Satisfy the latest go lint rules