Feat: multi apiExposedURL support

[huapox]

Cur only the specified apiExposedURL can be use with OAuth, But offen we may have Wan/Lan/Vpn url request to agola/gitea. In this situation, Then I try to set multi OAuth with diff url:

Urls:

agola-domain
http://domain/oauth2/callback

agola-lan (## test this)
http://lan:8000/oauth2/callback

agola-vpn
http://vpn:8000/oauth2/callback

Set OAuth returns OK:

##setOAuth
api=lan:8000
gitea=xxx-gitea:9443
id=cxxxa00
sec=xxa4xxxxewpYk=
rsource=gitea-sam-lan

docker run --rm sorintlab/agolademo --token "admintoken" --gateway-url http://$api remotesource create \
--name $rsource \
--type gitea \
--api-url https://$gitea \
--auth-type oauth2 \
--clientid $id \
--secret $sec \
--skip-ssh-host-key-check

2019-11-05T06:04:20.774Z	INFO	cmd/remotesourcecreate.go:110	creating remotesource
2019-11-05T06:04:21.070Z	INFO	cmd/remotesourcecreate.go:115	remotesource gitea-sam-lan created, ID: ab4186xxxx7383a1

OAuth login get err:

https://xxx-gitea:9443/login/oauth/authorize?client_id=cf4e1c0b-90ef-4a95-9196-7b135f878a00&redirect_uri=http%3A%2F%2F6.6.6.197%3A8000%2Foauth2%2Fcallback&response_type=code&scope=&state=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE1NzI5NzcwODcsInJlbW90ZV9zb3VyY2VfbmFtZSI6ImdpdGVhLXNhbS1kb21haW4iLCJyZXF1ZXN0Ijoie1wiUmVtb3RlU291cmNlTmFtZVwiOlwiZ2l0ZWEtc2FtLWRvbWFpblwiLFwiVXNlckFjY2Vzc1Rva2VuXCI6XCJcIixcIk9hdXRoMkFjY2Vzc1Rva2VuXCI6XCJcIixcIk9hdXRoMlJlZnJlc2hUb2tlblwiOlwiXCIsXCJPYXV0aDJBY2Nlc3NUb2tlbkV4cGlyZXNBdFwiOlwiMDAwMS0wMS0wMVQwMDowMDowMFpcIn0iLCJyZXF1ZXN0X3R5cGUiOiJsb2dpbnVzZXIifQ.l_MCVVAKi7PqEzZyQGFPw9W4mHDZ4YLlpv84-7VI6XA

redirect_uri=http%3A%2F%2F6.6.6.197%3A8000%2Foauth2%2Fcallback

6.6.6.197 just to be Vpn-ip that set in agola with apiExposedURL. Not http://lan:8000/oauth2/callback set in gitea.

[sgotti]

I never saw any Oauth2 system supporting this. It’s probably easier to just use configure the hosts or dns setup in your lan/vpn the resolve the agola hostname to the right ip.