93 lines
1.8 KiB
Python
93 lines
1.8 KiB
Python
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import re
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import typing as t
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def is_username_valid(
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username: str,
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allowed: t.Optional[t.List[t.Literal["all", "dot", "dash", "under"]]] = None,
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) -> bool:
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"""
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Checks if a username is valid.
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:raw-html:`<br />`
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Valid usernames can only include letters,
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numbers, ., -, and _ but cannot begin or end with
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the last three mentioned.
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:raw-html:`<br />`
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**Example use:**
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:raw-html:`<br />`
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.. code-block::
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is_username_valid("username", allowed=["all"])
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:raw-html:`<br />`
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**Output:**
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.. code-block::
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username : WILL PASS : True
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user.name : WILL PASS : True
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user-name : WILL PASS : True
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user_name : WILL PASS : True
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_user_name : WILL PASS : False
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:raw-html:`<br />`
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.. code-block::
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is_username_valid("username", allowed=["dot", "dash"])
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:raw-html:`<br />`
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**Output:**
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.. code-block::
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username : WILL PASS : True
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user.name : WILL PASS : True
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user-name : WILL PASS : True
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user-name.name : WILL PASS : True
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user_name : WILL PASS : False
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_user_name : WILL PASS : False
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.user.name : WILL PASS : False
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:raw-html:`<br />`
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-----
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:param username: str
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:param allowed: list - ["all", "dot", "dash", "under"] - defaults to ["all"]
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:return bool:
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"""
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if not username[0].isalnum() or not username[-1].isalnum():
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return False
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if allowed is None:
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allowed = ["all"]
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if "all" in allowed:
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return bool(re.match(r"^[a-zA-Z0-9._-]+$", username))
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if "under" not in allowed:
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if "_" in username:
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return False
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if "dot" not in allowed:
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if "." in username:
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return False
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if "dash" not in allowed:
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if "-" in username:
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return False
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return True
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