improved validation

kvmd/apps/__init__.py

@@ -49,6 +49,8 @@ from ..yamlconf import build_raw_from_options
 from ..yamlconf.dumper import make_config_dump
 from ..yamlconf.loader import load_yaml_file
 
+from ..validators.basic import valid_stripped_string
+from ..validators.basic import valid_stripped_string_not_empty
 from ..validators.basic import valid_bool
 from ..validators.basic import valid_number
 from ..validators.basic import valid_float_f0
@@ -201,7 +203,7 @@ def _get_config_scheme() -> Dict:
                 },
 
                 "external": {
-                    "type": Option("", type=(lambda arg: str(arg).strip())),
+                    "type": Option("", type=valid_stripped_string),
                 },
             },
 
@@ -211,17 +213,17 @@ def _get_config_scheme() -> Dict:
             },
 
             "hid": {
-                "type": Option("", type=(lambda arg: str(arg).strip())),
+                "type": Option("", type=valid_stripped_string_not_empty),
                 # Dynamic content
             },
 
             "atx": {
-                "type": Option("", type=(lambda arg: str(arg).strip())),
+                "type": Option("", type=valid_stripped_string_not_empty),
                 # Dynamic content
             },
 
             "msd": {
-                "type": Option("", type=(lambda arg: str(arg).strip())),
+                "type": Option("", type=valid_stripped_string_not_empty),
                 # Dynamic content
             },
 
@@ -258,7 +260,7 @@ def _get_config_scheme() -> Dict:
             "serial":       Option("CAFEBABE"),
 
             "gadget":     Option("kvmd", type=valid_otg_gadget),
-            "udc":        Option("",     type=(lambda arg: str(arg).strip())),
+            "udc":        Option("",     type=valid_stripped_string),
             "init_delay": Option(3.0,    type=valid_float_f01),
 
             "msd": {

kvmd/validators/basic.py

@@ -36,13 +36,27 @@ from . import check_in_list
 
 
 # =====
+def valid_stripped_string(arg: Any, name: str="") -> str:
+    if not name:
+        name = "stripped string"
+    return check_not_none_string(arg, name)
+
+
+def valid_stripped_string_not_empty(arg: Any, name: str="") -> str:
+    if not name:
+        name = "not empty stripped string"
+    if len(str(arg).strip()) == 0:
+        arg = None
+    return valid_stripped_string(arg, name)
+
+
 def valid_bool(arg: Any) -> bool:
     true_args = ["1", "true", "yes"]
     false_args = ["0", "false", "no"]
 
     name = f"bool ({true_args!r} or {false_args!r})"
 
-    arg = check_not_none_string(arg, name).lower()
+    arg = valid_stripped_string_not_empty(arg, name).lower()
     arg = check_in_list(arg, name, true_args + false_args)
     return (arg in true_args)
 
@@ -57,7 +71,7 @@ def valid_number(
 
     name = (name or type.__name__)
 
-    arg = check_not_none_string(arg, name)
+    arg = valid_stripped_string_not_empty(arg, name)
     try:
         arg = type(arg)
     except Exception:

kvmd/validators/net.py

@@ -24,18 +24,18 @@ import socket
 
 from typing import Any
 
-from . import check_not_none_string
 from . import check_re_match
 from . import check_any
 
 from .basic import valid_number
+from .basic import valid_stripped_string_not_empty
 
 
 # =====
 def valid_ip_or_host(arg: Any) -> str:
     name = "IP address or RFC-1123 hostname"
     return check_any(
-        arg=check_not_none_string(arg, name),
+        arg=valid_stripped_string_not_empty(arg, name),
         name=name,
         validators=[
             valid_ip,
@@ -47,7 +47,7 @@ def valid_ip_or_host(arg: Any) -> str:
 def valid_ip(arg: Any) -> str:
     name = "IP address"
     return check_any(
-        arg=check_not_none_string(arg, name),
+        arg=valid_stripped_string_not_empty(arg, name),
         name=name,
         validators=[
             lambda arg: (arg, socket.inet_pton(socket.AF_INET, arg))[0],

kvmd/validators/os.py

@@ -27,10 +27,10 @@ from typing import List
 from typing import Any
 
 from . import raise_error
-from . import check_not_none_string
 
 from .basic import valid_number
 from .basic import valid_string_list
+from .basic import valid_stripped_string_not_empty
 
 
 # =====
@@ -51,9 +51,7 @@ def valid_abs_path(arg: Any, type: str="", name: str="") -> str:  # pylint: disa
         if not name:
             name = "absolute path"
 
-    if len(str(arg).strip()) == 0:
+    arg = os.path.abspath(valid_stripped_string_not_empty(arg, name))
-        arg = None
-    arg = os.path.abspath(check_not_none_string(arg, name))
 
     if type:
         try:
@@ -79,9 +77,7 @@ def valid_printable_filename(arg: Any, name: str="") -> str:
     if not name:
         name = "printable filename"
 
-    if len(str(arg).strip()) == 0:
+    arg = valid_stripped_string_not_empty(arg, name)
-        arg = None
-    arg = check_not_none_string(arg, name)
 
     if "/" in arg or "\0" in arg or arg in [".", ".."]:
         raise_error(arg, name)