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validate.py
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validate.py
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import urlparse
import httplib
class URLValidator():
"""Decides whether or not a URL is welcome as part of this 150% legit service."""
# I'm sure this will be secure enough.
ALLOWED_PROTOCOLS = set(("http", "https", ""))
# .... Really?
MAXIMUM_URL_LENGTH = 2083
def __init__(self, url):
if not (url.startswith("http://") or url.startswith("https://")):
url = "http://" + url
self.url = url
self.url_parts = urlparse.urlparse(self.url)
print(url)
print(self.url_parts)
self.protocol = self.url_parts.scheme
# The domain becomes the path if there is no protocol.
if self.protocol:
self.domain = self.url_parts.netloc
else:
self.domain = self.url_parts.path
def validate_url(self):
"""
Checks that a URL is in fact a URL and not some other string
url: The url to validate
To add more validation checks, add a method to this class and call it in the all() function in this method.
"""
return all((self.check_length(), self.check_external(), self.check_protocol(), self.check_dns()))
def check_length(self):
return len(self.url) <= self.MAXIMUM_URL_LENGTH
def check_protocol(self):
"""Checks that the URL has a protocol that we're willing to obfuscate (http or https or no protocol)"""
# Reject unknown protocols.
return self.protocol in self.ALLOWED_PROTOCOLS
def check_dns(self):
"""
Does a DNS lookup on the domain part of the URL to check that it resolves
"""
try:
httplib.HTTPConnection(self.domain).request("GET", "/")
return True
except gaierror:
return False
def check_external(self):
"""No localhost for you."""
return self.domain != "localhost"