internal: backend: sftp: support user@domain parsing as user

internal/backend/sftp/config.go

@@ -56,8 +56,11 @@ func ParseConfig(s string) (interface{}, error) {
 		host = data[0]
 		dir = data[1]
 		// split user and host at the "@"
-		data = strings.SplitN(host, "@", 2)
-		if len(data) == 2 {
+		data = strings.SplitN(host, "@", 3)
+		if len(data) == 3 {
+			user = data[0] + "@" + data[1]
+			host = data[2]
+		} else if len(data) == 2 {
 			user = data[0]
 			host = data[1]
 		}

internal/backend/sftp/config_test.go

@@ -1,6 +1,8 @@
 package sftp
 
-import "testing"
+import (
+	"testing"
+)
 
 var configTests = []struct {
 	in  string
@@ -41,6 +43,10 @@ var configTests = []struct {
 		"sftp:user@host:/dir/subdir",
 		Config{User: "user", Host: "host", Path: "/dir/subdir"},
 	},
+	{
+		"sftp:user@domain@host:/dir/subdir",
+		Config{User: "user@domain", Host: "host", Path: "/dir/subdir"},
+	},
 	{
 		"sftp:host:../dir/subdir",
 		Config{Host: "host", Path: "../dir/subdir"},