Add DNS provider for g-core labs

[shubinmi]

Extending of DNS providers with G-Core DNS Service https://gcorelabs.com/dns/

related to #1455 (comment)

$ GCORE_PERMANENT_API_TOKEN="myToken" ./dist/lego -m my@gmail.com --dns gcore -d '*.g-core.tk' -d g-core.tk -s https://acme-staging-v02.api.letsencrypt.org/directory run
2021/07/20 12:05:04 No key found for account my@gmail.com. Generating a P256 key.
2021/07/20 12:05:04 Saved key to /Users/maxim/develope/local/gcore/lego-gcore/.lego/accounts/acme-staging-v02.api.letsencrypt.org/my@gmail.com/keys/my@gmail.com.key
2021/07/20 12:05:05 Please review the TOS at https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf
Do you accept the TOS? Y/n
н
Your input was invalid. Please answer with one of Y/y, n/N or by pressing enter.
Do you accept the TOS? Y/n
y
2021/07/20 12:05:12 [INFO] acme: Registering account for shubinmi@gmail.com
!!!! HEADS UP !!!!

Your account credentials have been saved in your Let's Encrypt
configuration directory at "/Users/maxim/develope/local/gcore/lego-gcore/.lego/accounts".

You should make a secure backup of this folder now. This
configuration directory will also contain certificates and
private keys obtained from Let's Encrypt so making regular
backups of this folder is ideal.
2021/07/20 12:05:12 [INFO] [*.g-core.tk, g-core.tk] acme: Obtaining bundled SAN certificate
2021/07/20 12:05:13 [INFO] [*.g-core.tk] AuthURL: https://acme-staging-v02.api.letsencrypt.org/acme/authz-v3/93175922
2021/07/20 12:05:13 [INFO] [g-core.tk] AuthURL: https://acme-staging-v02.api.letsencrypt.org/acme/authz-v3/93175923
2021/07/20 12:05:13 [INFO] [*.g-core.tk] acme: use dns-01 solver
2021/07/20 12:05:13 [INFO] [g-core.tk] acme: Could not find solver for: tls-alpn-01
2021/07/20 12:05:13 [INFO] [g-core.tk] acme: Could not find solver for: http-01
2021/07/20 12:05:13 [INFO] [g-core.tk] acme: use dns-01 solver
2021/07/20 12:05:13 [INFO] [*.g-core.tk] acme: Preparing to solve DNS-01
2021/07/20 12:05:13 [INFO] [g-core.tk] acme: Preparing to solve DNS-01
2021/07/20 12:05:14 [INFO] [*.g-core.tk] acme: Trying to solve DNS-01
2021/07/20 12:05:14 [INFO] [*.g-core.tk] acme: Checking DNS record propagation using [10.254.1.140:53 10.254.0.140:53]
2021/07/20 12:05:34 [INFO] Wait for propagation [timeout: 6m0s, interval: 20s]
2021/07/20 12:05:34 [INFO] [*.g-core.tk] acme: Waiting for DNS record propagation.
2021/07/20 12:05:54 [INFO] [*.g-core.tk] acme: Waiting for DNS record propagation.
2021/07/20 12:06:14 [INFO] [*.g-core.tk] acme: Waiting for DNS record propagation.
2021/07/20 12:06:36 [INFO] [*.g-core.tk] The server validated our request
2021/07/20 12:06:36 [INFO] [g-core.tk] acme: Trying to solve DNS-01
2021/07/20 12:06:36 [INFO] [g-core.tk] acme: Checking DNS record propagation using [10.254.1.140:53 10.254.0.140:53]
2021/07/20 12:06:56 [INFO] Wait for propagation [timeout: 6m0s, interval: 20s]
2021/07/20 12:07:02 [INFO] [g-core.tk] The server validated our request
2021/07/20 12:07:02 [INFO] [*.g-core.tk] acme: Cleaning DNS-01 challenge
2021/07/20 12:07:02 [INFO] [g-core.tk] acme: Cleaning DNS-01 challenge
2021/07/20 12:07:03 [INFO] [*.g-core.tk, g-core.tk] acme: Validations succeeded; requesting certificates
2021/07/20 12:07:03 [INFO] [*.g-core.tk] Server responded with a certificate.

I am a member of g-core labs.

[ldez]

Hello, in order for a PR adding a DNS provider to be accepted, you have to:

• add a description to your PR
• be able to maintain this provider
• have a homogeneous design with the other providers
• add tests (units)

make test

• add tests ("live")
  

  lego/providers/dns/cloudflare/cloudflare_test.go

  Lines 125 to 151 in c938de6

  	func TestLivePresent(t *testing.T) {
  	if !envTest.IsLiveTest() {
  	t.Skip("skipping live test")
  	}
  	envTest.RestoreEnv()
  	provider, err := NewDNSProvider()
  	require.NoError(t, err)
  	err = provider.Present(envTest.GetDomain(), "", "123d==")
  	require.NoError(t, err)
  	}
  	func TestLiveCleanUp(t *testing.T) {
  	if !envTest.IsLiveTest() {
  	t.Skip("skipping live test")
  	}
  	envTest.RestoreEnv()
  	provider, err := NewDNSProvider()
  	require.NoError(t, err)
  	time.Sleep(2 * time.Second)
  	err = provider.CleanUp(envTest.GetDomain(), "", "123d==")
  	require.NoError(t, err)
  	}

make test

• add a provider descriptor
• generate CLI help, documentation, and readme.

make generate-dns

• be able to do: (and put the output of this command to a comment in your PR)

rm -rf .lego

./lego -m your@email.com --dns YOUR_PROVIDER_NAME -d *.example.com -d example.com -s https://acme-staging-v02.api.letsencrypt.org/directory run

Note the wildcard domain is important.

• pass the linter (golangci-lint must be installed):

make checks

• do go mod tidy

[ldez]

LGTM

[shubinmi]

@ldez hey,
what is the estimated date of the next release with GCore provider?