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phonenumberextractor.py
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phonenumberextractor.py
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import urllib
import urllib.request
import re
import threading
import time
import sys
from bs4 import BeautifulSoup, Comment
from urllib.error import URLError, HTTPError
class PhoneNumberExtractor:
"""
PhoneNumberExtractor extracts phone numbers from given website url
"""
def __init__(self):
"""
Attributes:
pattern_*_*: Different regex patterns for extracting phone numbers
clean_phonenum_pattern: Specified clean format for phone number
"""
self.pattern_0_a = re.compile(r'\+[-()\s\d]+?(?=\s*[+<,\.;])')
self.pattern_0_b = re.compile(r'\(\d[-()\s\d]+?(?=\s*[+<,\.;])')
self.pattern_1_a = re.compile(r'\d+(?: \d+){2,}')
self.pattern_1_b = re.compile(r'\(\d+\)(?: \d+){2,}')
self.clean_phonenum_pattern = re.compile('[^0-9\+()]')
def _remove_attrs(self, soup):
"""Method which removes unnecessary attributes from html elements
Args:
soup - BeautifulSoup object which represents html document
Returns:
BeautifulSoup object without attributes in html elements
"""
for tag in soup.findAll(True):
tag.attrs = {}
return soup
def _contains_digit(self, text):
return any(c.isdigit() for c in text)
def _remove_duplicates(self, matches):
"""Method which removes duplicates or very similar numbers
(result of using different regexes) from list of phone numbers
Args:
matches - list of matched phone numbers
Returns:
List of phone numbers but without duplicates
"""
num_chars_to_check = 6
unique_matches = []
i = 0
while i < len(matches):
is_duplicate = False
j = 0
while j < len(matches):
if i == j:
j += 1
continue
if matches[i][-num_chars_to_check:] == matches[j][-num_chars_to_check:]:
if len(matches[i]) < len(matches[j]):
is_duplicate = True
break
j += 1
if not is_duplicate:
unique_matches.append(matches[i])
i += 1
return set(unique_matches)
def _match_pattern(self, pattern, text):
"""Method which uses regex to find matching phone numbers from text
Args:
pattern - regex pattern that is used for finding phone number
text - string which is searched for phone numbers
Returns:
list of matching phone numbers
"""
all_matched = re.findall(pattern, text)
for matchedtext in all_matched:
if self._contains_digit(matchedtext):
matches.append(matchedtext.strip())
def _find_matches(self, text, pttrns):
"""Method which combines different regexes to find phone numbers in text
Args:
text - string which is searched for phone numbers
pttrns - list of regex patterns used for searching
Returns:
list of matching phone numbers
"""
global matches
matches = []
#threads = []
start = time.time()
for pattern in pttrns:
self._match_pattern(pattern, text)
# pattern_thread = threading.Thread(target=self._match_pattern, args=(pattern, text))
# threads.append(pattern_thread)
# pattern_thread.start()
#for t in threads:
# t.join()
end = time.time()
return self._remove_duplicates(matches)
def _retrieve_html_from_url(self, url):
"""Method which connects to website url, and retrieves html document as string
Args:
url - website url
Returns:
String representation of html document
"""
req = urllib.request.Request(url, headers={'User-Agent' : "Magic Browser"})
try:
con = urllib.request.urlopen( req )
except HTTPError as e:
sys.stderr.write("HTTPError: " + str(e.code) + "\n")
sys.exit()
except URLError as e:
sys.stderr.write("URLError: " + str(e.reason) + "\n")
sys.exit()
else:
html_str = con.read().decode("utf8")
return html_str
def _clean_html(self, html_str):
"""Method which preprocess the html document. Unnecessary
html elements such as script, style, head, comments are removed.
Args:
html_str - string representation of html document
Returns:
BeautifulSoup object representation of html document
"""
html_soup = BeautifulSoup(html_str, 'html.parser')
for element in html_soup(["script", "style", "head"]):
element.extract()
for element in html_soup:
if isinstance(element, Comment):
element.extract()
html_soup = str(self._remove_attrs(html_soup))
for ch in ['-', '\/']:
html_soup = html_soup.replace(ch, " ")
return html_soup
def _clean_phone_numbers(self, phone_nums):
"""Method which formats the phone numbers like it's specified
Args:
phone_nums - list of phone numbers
Returns:
list of formatted phone numbers
"""
cleaned_nums = []
for num in phone_nums:
clean_num = re.sub(self.clean_phonenum_pattern, ' ', num)
cleaned_nums.append(clean_num.strip())
return cleaned_nums
def extract_phone_numbers(self, url):
"""Method that can be called from PhoneNumberExtractor object.
Used to search and find phone numbers from website for the given url.
Args:
url - website url
Returns:
list of found phone numbers
"""
html_str = self._retrieve_html_from_url(url)
cleaned_html = self._clean_html(html_str)
matches = self._find_matches(cleaned_html, [self.pattern_0_a, self.pattern_0_b, self.pattern_1_a, self.pattern_1_b])
matches = self._clean_phone_numbers(matches)
return matches