First version of the domain extractor and classify

The class domainclassifer got two methods:

- domain() to extract all potential domains from a raw text
  The method returns a list.

- validdomain() returning all the existing domains based on their
  known DNS records sets like A,AAAA or CNAME records.
  The method returns a set. If the extended option is requested, it's a list
  of tuples containing the domain with their existing DNS records and
  their returned data.

DomainClassifier/domainclassifier.py

@@ -0,0 +1,33 @@
+import re
+import dns.resolver
+
+class Extract:
+    def __init__(self, rawtext = None):
+        self.rawtext = rawtext
+    def domain(self):
+        self.domain = []
+        domain = re.compile(r'\b([a-zA-Z\d-]{,63}(\.[a-zA-Z\d-]{,63})+)\b')
+        for x in domain.findall(self.rawtext):
+            if x[0]:
+                self.domain.append(x[0])
+
+        return self.domain
+
+    def validdomain(self, rtype=['A','AAAA','SOA','MX','CNAME'], extended=None):
+        if extended is None:
+            self.validdomain = set()
+        else:
+            self.validdomain = []
+        for domain in self.domain:
+            for dnstype in rtype:
+                try:
+                    answers = dns.resolver.query(domain, dnstype)
+                except:
+                    pass
+                else:
+                    if extended is None:
+                        self.validdomain.add((domain))
+                    else:
+                        self.validdomain.append((domain,dnstype,answers[0]))
+        return self.validdomain
+

DomainClassifier/test.py

@@ -0,0 +1,5 @@
+import domainclassifier
+
+c = domainclassifier.Extract("this is a text with a domain called test@foo.lu another test abc.lu something a.b.c.d.e end of 1.2.3.4 foo.be")
+print c.domain()
+print c.validdomain(extended=None)