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# Authors: Rob Crittenden <rcritten@redhat.com> 

# 

# Copyright (C) 2007  Red Hat 

# see file 'COPYING' for use and warranty information 

# 

# 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 <http://www.gnu.org/licenses/>. 

# 

 

import re 

 

def Email(mail, notEmpty=True): 

    """Do some basic validation of an e-mail address. 

       Return True if ok 

       Return False if not 

 

       If notEmpty is True the this will return an error if the field 

       is "" or None. 

    """ 

    usernameRE = re.compile(r"^[^ \t\n\r@<>()]+$", re.I) 

    domainRE = re.compile(r"^[a-z0-9][a-z0-9\.\-_]*\.[a-z]+$", re.I) 

 

    if not mail or mail is None: 

        if  notEmpty is True: 

            return False 

        else: 

            return True 

 

    mail = mail.strip() 

    s = mail.split('@', 1) 

    try: 

        username, domain=s 

    except ValueError: 

        return False 

    if not usernameRE.search(username): 

        return False 

    if not domainRE.search(domain): 

        return False 

 

    return True 

 

def Plain(text, notEmpty=False, allowSpaces=True): 

    """Do some basic validation of a plain text field 

       Return True if ok 

       Return False if not 

 

       If notEmpty is True the this will return an error if the field 

       is "" or None. 

    """ 

    if (text is None) or (not text.strip()): 

        if notEmpty is True: 

            return False 

        else: 

            return True 

 

    if allowSpaces: 

        textRE = re.compile(r"^[a-zA-Z_\-0-9\'\ ]*$") 

    else: 

        textRE = re.compile(r"^[a-zA-Z_\-0-9\']*$") 

    if not textRE.search(text): 

        return False 

 

    return True 

 

def String(text, notEmpty=False): 

    """A string type. This is much looser in what it allows than plain""" 

 

    if text is None or not text.strip(): 

        if notEmpty is True: 

            return False 

        else: 

            return True 

 

    return True 

 

def Path(text, notEmpty=False): 

    """Do some basic validation of a path 

       Return True if ok 

       Return False if not 

 

       If notEmpty is True the this will return an error if the field 

       is "" or None. 

    """ 

    textRE = re.compile(r"^[a-zA-Z_\-0-9\\ \.\/\\:]*$") 

 

    if not text and notEmpty is True: 

        return False 

 

    if text is None: 

        if notEmpty is True: 

            return False 

        else: 

            return True 

 

    if not textRE.search(text): 

        return False 

 

    return True 

 

def GoodName(text, notEmpty=False): 

    """From shadow-utils: 

 

       User/group names must match gnu e-regex: 

       [a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,30}[a-zA-Z0-9_.$-]? 

 

       as a non-POSIX, extension, allow "$" as the last char for 

       sake of Samba 3.x "add machine script" 

 

       Return True if ok 

       Return False if not 

    """ 

    textRE = re.compile(r"^[a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,30}[a-zA-Z0-9_.$-]?$") 

 

    if not text and notEmpty is True: 

        return False 

 

    if text is None: 

        if notEmpty is True: 

            return False 

        else: 

            return True 

 

    m = textRE.match(text) 

    if not m or text != m.group(0): 

        return False 

 

    return True