admin listener as opt-in for initial config (#2834)

* Always cleanup admin endpoint first

* Error out if no config has been set (#2833)

* Ignore explicitly missing admin config (#2833)

* Separate config loading from admin initialization (#2833)

* Add admin option to specify admin listener address (#2833)

* Use zap for reporting admin endpoint status

2 files changed, 19 insertions, 0 deletions

diff --git a/caddyconfig/httpcaddyfile/httptype.go b/caddyconfig/httpcaddyfile/httptype.go
index bc546b4..05022d1 100644
--- a/caddyconfig/httpcaddyfile/httptype.go
+++ b/caddyconfig/httpcaddyfile/httptype.go
@@ -74,6 +74,8 @@ func (st ServerType) Setup(originalServerBlocks []caddyfile.ServerBlock,
 				val, err = parseOptACMECA(disp)
 			case "email":
 				val, err = parseOptEmail(disp)
+			case "admin":
+				val, err = parseOptAdmin(disp)
 			default:
 				return nil, warnings, fmt.Errorf("unrecognized parameter name: %s", dir)
 			}
@@ -254,6 +256,9 @@ func (st ServerType) Setup(originalServerBlocks []caddyfile.ServerBlock,
 			storageCvtr.(caddy.Module).CaddyModule().ID(),
 			&warnings)
 	}
+	if adminConfig, ok := options["admin"].(string); ok && adminConfig != "" {
+		cfg.Admin = &caddy.AdminConfig{Listen: adminConfig}
+	}
 
 	return cfg, warnings, nil
 }
diff --git a/caddyconfig/httpcaddyfile/options.go b/caddyconfig/httpcaddyfile/options.go
index a60d060..74ec507 100644
--- a/caddyconfig/httpcaddyfile/options.go
+++ b/caddyconfig/httpcaddyfile/options.go
@@ -132,3 +132,17 @@ func parseOptEmail(d *caddyfile.Dispenser) (string, error) {
 	}
 	return val, nil
 }
+
+func parseOptAdmin(d *caddyfile.Dispenser) (string, error) {
+	if d.Next() {
+		var listenAddress string
+		d.AllArgs(&listenAddress)
+
+		if listenAddress == "" {
+			listenAddress = caddy.DefaultAdminListen
+		}
+
+		return listenAddress, nil
+	}
+	return "", nil
+}