1 files changed, 83 insertions, 0 deletions
diff --git a/kvmd/validators/__init__.py b/kvmd/validators/__init__.py
new file mode 100644
index 00000000..f4b0f1fa
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+++ b/kvmd/validators/__init__.py
@@ -0,0 +1,83 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2018  Maxim Devaev <[email protected]>                    #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import re
+
+from typing import List
+from typing import Callable
+from typing import NoReturn
+from typing import Any
+
+
+# =====
+class ValidatorError(ValueError):
+    pass
+
+
+# =====
+def raise_error(arg: Any, name: str, hide: bool=False) -> NoReturn:
+    arg_str = " "
+    if not hide:
+        arg_str = (" %r " if isinstance(arg, (str, bytes)) else " '%s' ") % (arg)
+    raise ValidatorError("The argument" + arg_str + "is not a valid " + name)
+
+
+def check_not_none(arg: Any, name: str) -> Any:
+    if arg is None:
+        raise ValidatorError("Empty argument is not a valid %s" % (name))
+    return arg
+
+
+def check_not_none_string(arg: Any, name: str, strip: bool=True) -> str:
+    arg = str(check_not_none(arg, name))
+    if strip:
+        arg = arg.strip()
+    return arg
+
+
+def check_in_list(arg: Any, name: str, variants: List) -> Any:
+    if arg not in variants:
+        raise_error(arg, name)
+    return arg
+
+
+def check_string_in_list(arg: Any, name: str, variants: List[str], lower: bool=True) -> Any:
+    arg = check_not_none_string(arg, name)
+    if lower:
+        arg = arg.lower()
+    return check_in_list(arg, name, variants)
+
+
+def check_re_match(arg: Any, name: str, pattern: str, strip: bool=True, hide: bool=False) -> str:
+    arg = check_not_none_string(arg, name, strip=strip)
+    if re.match(pattern, arg, flags=re.MULTILINE) is None:
+        raise_error(arg, name, hide=hide)
+    return arg
+
+
+def check_any(arg: Any, name: str, validators: List[Callable[[Any], Any]]) -> Any:
+    for validator in validators:
+        try:
+            return validator(arg)
+        except Exception:
+            pass
+    raise_error(arg, name)