98 lines
2.6 KiB
Python
98 lines
2.6 KiB
Python
import re
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import sys
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from urllib.parse import urlparse
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class D(dict):
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'''
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Allows us to run substitutions on regexes that contain repetition ranges
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without erroring out on those keys.
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'''
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def __missing__(self, k):
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return '{' + k + '}'
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'''
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Workaround for {}s that might appear in ignore patterns; format interprets
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these as positional parameters.
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'''
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pos_placeholders = ['{}'] * 256
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class Ignoracle(object):
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'''
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An Ignoracle tests a URL against a list of patterns and returns whether or
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not that URL should be grabbed.
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An Ignoracle's pattern list starts as the empty list.
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'''
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patterns = []
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def set_patterns(self, strings):
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'''
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Given a list of strings, replaces this Ignoracle's pattern state with
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that list.
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'''
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self.patterns = []
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for string in strings:
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if isinstance(string, bytes):
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string = string.decode('utf-8')
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self.patterns.append(string)
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def ignores(self, url, **kwargs):
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'''
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If an ignore pattern matches the given URL, returns that pattern as a string.
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Otherwise, returns False.
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'''
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pu = re.escape(kwargs.get('primary_url') or '')
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ph = re.escape(kwargs.get('primary_netloc') or '')
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for pattern in self.patterns:
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try:
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expanded = pattern.replace('{primary_url}', pu)
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expanded = expanded.replace('{primary_netloc}', ph)
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match = re.search(expanded, url)
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if match:
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return pattern
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except re.error as error:
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print('Pattern %s is invalid (error: %s). Ignored.' % (pattern, str(error)), file=sys.stderr)
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return False
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def parameterize_record_info(record_info):
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'''
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Given a wpull record_info dict, generates a dict with primary_url and
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primary_netloc keys. This is meant to be used in Ignoracle.ignores.
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The primary_url key is:
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1. record_info['top_url'], or
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2. record_info['url'] if record_info['level'] is zero, or
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3. None otherwise.
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If primary_url is a valid URL, the primary_netloc key is the network
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location component of primary_url (i.e. for HTTP,
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[user:password@]host[:port]). Otherwise, primary_netloc is None.
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'''
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primary_url = None
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primary_netloc = None
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if record_info.get('level') == 0:
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primary_url = record_info.get('url')
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else:
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primary_url = record_info.get('top_url')
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if primary_url:
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parsed = urlparse(primary_url)
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primary_netloc = parsed.netloc
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return dict(
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primary_url=primary_url,
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primary_netloc=primary_netloc
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)
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