From a653611dc8125b24e37dd757d4c66b0c8d14bf2a Mon Sep 17 00:00:00 2001
From: Christian Anton <mail@christiananton.de>
Date: Sat, 7 Aug 2021 13:03:14 +0200
Subject: [PATCH] azure: zone name as environment variable (#1433)

---
 cmd/zz_gen_cmd_dnshelp.go        | 1 +
 docs/content/dns/zz_gen_azure.md | 1 +
 providers/dns/azure/azure.go     | 5 +++++
 providers/dns/azure/azure.toml   | 1 +
 4 files changed, 8 insertions(+)

diff --git a/cmd/zz_gen_cmd_dnshelp.go b/cmd/zz_gen_cmd_dnshelp.go
index 9a80def6..cc672d04 100644
--- a/cmd/zz_gen_cmd_dnshelp.go
+++ b/cmd/zz_gen_cmd_dnshelp.go
@@ -261,6 +261,7 @@ func displayDNSHelp(name string) error {
 		ew.writeln(`	- "AZURE_POLLING_INTERVAL":	Time between DNS propagation check`)
 		ew.writeln(`	- "AZURE_PROPAGATION_TIMEOUT":	Maximum waiting time for DNS propagation`)
 		ew.writeln(`	- "AZURE_TTL":	The TTL of the TXT record used for the DNS challenge`)
+		ew.writeln(`	- "AZURE_ZONE_NAME":	Zone name to use inside Azure DNS service to add the TXT record in`)
 
 		ew.writeln()
 		ew.writeln(`More information: https://go-acme.github.io/lego/dns/azure`)
diff --git a/docs/content/dns/zz_gen_azure.md b/docs/content/dns/zz_gen_azure.md
index 4c4dcf7b..be0cd674 100644
--- a/docs/content/dns/zz_gen_azure.md
+++ b/docs/content/dns/zz_gen_azure.md
@@ -49,6 +49,7 @@ More information [here](/lego/dns/#configuration-and-credentials).
 | `AZURE_POLLING_INTERVAL` | Time between DNS propagation check |
 | `AZURE_PROPAGATION_TIMEOUT` | Maximum waiting time for DNS propagation |
 | `AZURE_TTL` | The TTL of the TXT record used for the DNS challenge |
+| `AZURE_ZONE_NAME` | Zone name to use inside Azure DNS service to add the TXT record in |
 
 The environment variable names can be suffixed by `_FILE` to reference a file instead of a value.
 More information [here](/lego/dns/#configuration-and-credentials).
diff --git a/providers/dns/azure/azure.go b/providers/dns/azure/azure.go
index 091b912f..7289592f 100644
--- a/providers/dns/azure/azure.go
+++ b/providers/dns/azure/azure.go
@@ -33,6 +33,7 @@ const (
 	EnvTenantID         = envNamespace + "TENANT_ID"
 	EnvClientID         = envNamespace + "CLIENT_ID"
 	EnvClientSecret     = envNamespace + "CLIENT_SECRET"
+	EnvZoneName         = envNamespace + "ZONE_NAME"
 
 	EnvTTL                = envNamespace + "TTL"
 	EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
@@ -242,6 +243,10 @@ func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
 
 // Checks that azure has a zone for this domain name.
 func (d *DNSProvider) getHostedZoneID(ctx context.Context, fqdn string) (string, error) {
+	if zone := env.GetOrFile(EnvZoneName); zone != "" {
+		return zone, nil
+	}
+
 	authZone, err := dns01.FindZoneByFqdn(fqdn)
 	if err != nil {
 		return "", err
diff --git a/providers/dns/azure/azure.toml b/providers/dns/azure/azure.toml
index c8336115..ae5ef422 100644
--- a/providers/dns/azure/azure.toml
+++ b/providers/dns/azure/azure.toml
@@ -20,6 +20,7 @@ Example = ''''''
     AZURE_PROPAGATION_TIMEOUT = "Maximum waiting time for DNS propagation"
     AZURE_TTL = "The TTL of the TXT record used for the DNS challenge"
     AZURE_METADATA_ENDPOINT = "Metadata Service endpoint URL"
+    AZURE_ZONE_NAME = "Zone name to use inside Azure DNS service to add the TXT record in"
 
 [Links]
   API = "https://docs.microsoft.com/en-us/go/azure/"