added an option to enable GCP healthcheck endpoints

fixes typo

Improve websocket support

Set redirect URL path when host is present

* Use encoding/json for SessionState serialization

In order to make it easier to extend in future.

* Store only email and user in cookie when cipher is unavailable

This improves safety and robustness, and also preserves the existing
behaviour.

* Add TestEncodeSessionState/TestDecodeSessionState

Use the test vectors with JSON encoding just introduced.

* Support session state encoding in older versions

* Add test cases for legacy session state strings

* Add check for wrong expiration time in session state strings

* Avoid exposing time.Time zero value when encoding session state string

* Update CHANGELOG.md

This commit fix the issue #98

* first stab at login.gov provider

* fixing bugs now that I think I understand things better

* fixing up dependencies

* remove some debug stuff

* Fixing all dependencies to point at my fork

* forgot to hit save on the github rehome here

* adding options for setting keys and so on, use JWT workflow instead of PKCE

* forgot comma

* was too aggressive with search/replace

* need JWTKey to be byte array

* removed custom refresh stuff

* do our own custom jwt claim and store it in the normal session store

* golang json types are strange

* I have much to learn about golang

* fix time and signing key

* add http lib

* fixed claims up since we don't need custom claims

* add libs

* forgot ioutil

* forgot ioutil

* moved back to pusher location

* changed proxy github location back so that it builds externally, fixed up []byte stuff, removed client_secret if we are using login.gov

* update dependencies

* do JWTs properly

* finished oidc flow, fixed up tests to work better

* updated comments, added test that we set expiresOn properly

* got confused with header and post vs get

* clean up debug and test dir

* add login.gov to README, remove references to my repo

* forgot to remove un-needed code

* can use sample_key* instead of generating your own

* updated changelog

* apparently golint wants comments like this

* linter wants non-standard libs in a separate grouping

* Update options.go

Co-Authored-By: timothy-spencer <timothy.spencer@gsa.gov>

* Update options.go

Co-Authored-By: timothy-spencer <timothy.spencer@gsa.gov>

* remove sample_key, improve comments related to client-secret, fix changelog related to PR feedback

* github doesn't seem to do gofmt when merging.  :-)

* update CODEOWNERS

* check the nonce

* validate the JWT fully

* forgot to add pubjwk-url to README

* unexport the struct

* fix up the err masking that travis found

* update nonce comment by request of @JoelSpeed

* argh.  Thought I'd formatted the merge properly, but apparently not.

* fixed test to not fail if the query time was greater than zero

* fixes deletion of splitted cookies

* three minor adjustments to improve the tests

* changed cookie name matching to regex

* Update oauthproxy.go

Co-Authored-By: einfachchr <einfachchr@gmail.com>

* removed unused variable

* Changelog

Revert OAuthCallbackPath

Merge websocket proxy feature from openshift/oauth-proxy

Merge websocket proxy feature from openshift/oauth-proxy. Original author: Hiram Chirino <hiram@hiramchirino.com>

Fall back to using OIDC Subject instead of Email

Email is not mandatory field, Subject is mandatory and expected to be unique. Might want to take a look at UserInfo first, however.

Issue: #56

Use non-root user in docker images

Co-Authored-By: kskewes <karl.skewes@gmail.com>

* Added conditional to prevent user-supplied redirect URL getting
clobbered

Change-type: patch

* use redirectURL as OAuthCallbackURL (as it should be!)

Change-type: patch

Type: docs
I simply added the word health check. I was searching all over the
package for a health check, to only realise that it had been called
ping. I think the small addition might help others avoid my troubles.

Run as non-root user and group

In the unlikely event that you are currently persisting data to disk then this
change may break file read/write access due to a change in the UID/GID that the
oauth2_proxy process runs as.

Run as non-root system user and group `oauth2proxy` with UID/GID `2000` to avoid clashing with typical local users.
An alternative to creating a separate user is to ~~chown binary and~~ run as `USER nobody`, which also works, can amend this PR if required.

Least access privileges.
Close: https://github.com/pusher/oauth2_proxy/issues/78

Locally with Docker (`-version`):
```
$ ps aux | grep oauth2
2000     25192  6.0  0.0      0     0 ?        Ds   15:53   0:00 [oauth2_proxy]
```

Running in Kubernetes 1.13 with the following also specified:
```
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 10001
```
```
$ kubectl exec -it -n oauth2-proxy oauth2-proxy-85c9f58ffc-dz9lr sh
/opt $ whoami
whoami: unknown uid 10001
/opt $ ps aux
PID   USER     TIME  COMMAND
    1 10001     0:00 /opt/oauth2_proxy --whitelist-domain=.example.com --cookie-domain=example.com --email-domain=example.com --upstream=file:///dev/null --http-address=0.0.0.0:4180
   11 10001     0:00 sh
   17 10001     0:00 ps aux
```

<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->

- [x] My change requires a change to the documentation or CHANGELOG.
- [x] I have updated the documentation/CHANGELOG accordingly.
- [x] I have created a feature (non-master) branch for my PR.

* added karrieretutor go-oidc fork for using an AAD B2C Policy

* added karrieretutor go-oidc fork for using an AAD B2C Policy

* added --skip-oidc-discovery option

* added --skip-oidc-discovery option

* add simple test for skip-oidc-discovery option

* revert Dockerfile to pusher upstream

* revert Dockerfile to pusher upstream

* remove karrieretutor b2c option leftover

* remove karrieretutor b2c option leftover

* Fix typo (missing letters)

Co-Authored-By: marratj <marrat@marrat.de>

* Fix typo (missing letters)

Co-Authored-By: marratj <marrat@marrat.de>

* replace fake http client with NewProvider() from go-oidc

* remove OIDC UserInfo URL option (not required)

* add info about -skip-oidc-discovery to README

* add note to changelog

* Update outdated comment

build: fix: configure fails if GOPATH environment variable not set