Merged soc2009/model-validation to trunk. Thanks, Honza!

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12098 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/validators.py

@@ -0,0 +1,137 @@
+import re
+
+from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext_lazy as _
+from django.utils.encoding import smart_unicode
+
+# These values, if given to validate(), will trigger the self.required check.
+EMPTY_VALUES = (None, '', [], (), {})
+
+try:
+    from django.conf import settings
+    URL_VALIDATOR_USER_AGENT = settings.URL_VALIDATOR_USER_AGENT
+except ImportError:
+    # It's OK if Django settings aren't configured.
+    URL_VALIDATOR_USER_AGENT = 'Django (http://www.djangoproject.com/)'
+
+class RegexValidator(object):
+    regex = ''
+    message = _(u'Enter a valid value.')
+    code = 'invalid'
+
+    def __init__(self, regex=None, message=None, code=None):
+        if regex is not None:
+            self.regex = regex
+        if message is not None:
+            self.message = message
+        if code is not None:
+            self.code = code
+
+        if isinstance(self.regex, basestring):
+            self.regex = re.compile(regex)
+
+    def __call__(self, value):
+        """
+        Validates that the input matches the regular expression.
+        """
+        if not self.regex.search(smart_unicode(value)):
+            raise ValidationError(self.message, code=self.code)
+
+class URLValidator(RegexValidator):
+    regex = re.compile(
+        r'^https?://' # http:// or https://
+        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?|' #domain...
+        r'localhost|' #localhost...
+        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
+        r'(?::\d+)?' # optional port
+        r'(?:/?|[/?]\S+)$', re.IGNORECASE)
+
+    def __init__(self, verify_exists=False, validator_user_agent=URL_VALIDATOR_USER_AGENT):
+        super(URLValidator, self).__init__()
+        self.verify_exists = verify_exists
+        self.user_agent = validator_user_agent
+
+    def __call__(self, value):
+        super(URLValidator, self).__call__(value)
+        if self.verify_exists:
+            import urllib2
+            headers = {
+                "Accept": "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
+                "Accept-Language": "en-us,en;q=0.5",
+                "Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
+                "Connection": "close",
+                "User-Agent": self.user_agent,
+            }
+            try:
+                req = urllib2.Request(value, None, headers)
+                u = urllib2.urlopen(req)
+            except ValueError:
+                raise ValidationError(_(u'Enter a valid URL.'), code='invalid')
+            except: # urllib2.URLError, httplib.InvalidURL, etc.
+                raise ValidationError(_(u'This URL appears to be a broken link.'), code='invalid_link')
+
+
+def validate_integer(value):
+    try:
+        int(value)
+    except (ValueError, TypeError), e:
+        raise ValidationError('')
+
+
+email_re = re.compile(
+    r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"  # dot-atom
+    r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"' # quoted-string
+    r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$', re.IGNORECASE)  # domain
+validate_email = RegexValidator(email_re, _(u'Enter a valid e-mail address.'), 'invalid')
+
+slug_re = re.compile(r'^[-\w]+$')
+validate_slug = RegexValidator(slug_re, _(u"Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens."), 'invalid')
+
+ipv4_re = re.compile(r'^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$')
+validate_ipv4_address = RegexValidator(ipv4_re, _(u'Enter a valid IPv4 address.'), 'invalid')
+
+comma_separated_int_list_re = re.compile('^[\d,]+$')
+validate_comma_separated_integer_list = RegexValidator(comma_separated_int_list_re, _(u'Enter only digits separated by commas.'), 'invalid')
+
+
+class BaseValidator(object):
+    compare = lambda self, a, b: a is not b
+    clean   = lambda self, x: x
+    message = _(u'Ensure this value is %(limit_value)s (it is %(show_value)s).')
+    code = 'limit_value'
+
+    def __init__(self, limit_value):
+        self.limit_value = limit_value
+
+    def __call__(self, value):
+        cleaned = self.clean(value)
+        params = {'limit_value': self.limit_value, 'show_value': cleaned}
+        if self.compare(cleaned, self.limit_value):
+            raise ValidationError(
+                self.message % params,
+                code=self.code,
+                params=params,
+            )
+
+class MaxValueValidator(BaseValidator):
+    compare = lambda self, a, b: a > b
+    message = _(u'Ensure this value is less than or equal to %(limit_value)s.')
+    code = 'max_value'
+
+class MinValueValidator(BaseValidator):
+    compare = lambda self, a, b: a < b
+    message = _(u'Ensure this value is greater than or equal to %(limit_value)s.')
+    code = 'min_value'
+
+class MinLengthValidator(BaseValidator):
+    compare = lambda self, a, b: a < b
+    clean   = lambda self, x: len(x)
+    message = _(u'Ensure this value has at least %(limit_value)d characters (it has %(show_value)d).')
+    code = 'min_length'
+
+class MaxLengthValidator(BaseValidator):
+    compare = lambda self, a, b: a > b
+    clean   = lambda self, x: len(x)
+    message = _(u'Ensure this value has at most %(limit_value)d characters (it has %(show_value)d).')
+    code = 'max_length'
+