78 lines
2.3 KiB
Python
Executable File
78 lines
2.3 KiB
Python
Executable File
#!/usr/bin/env python3
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''' Find redundant items in accelerated-domains.china.conf.
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e.g. 'bar.foo.com' is redundant for 'foo.com'.
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'''
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from collections.abc import Iterable
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def load(conf_file):
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''' Parse conf file & Prepare data structure
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Returns: [ ['abc', 'com'],
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['bar', 'foo', 'com'],
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... ]
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'''
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results = []
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if isinstance(conf_file, str):
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lines = open(conf_file, 'r').readlines()
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elif isinstance(conf_file, Iterable):
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lines = iter(conf_file)
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for line in lines:
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line = line.strip()
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if line == '' or line.startswith('#'):
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continue
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# A domain name is case-insensitive and
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# consists of several labels, separated by a full stop
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domain_name = line.split('/')[1]
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domain_name = domain_name.lower()
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domain_labels = domain_name.split('.')
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results.append(domain_labels)
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# Sort results by domain labels' length
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results.sort(key=len)
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return results
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def find(labelses):
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''' Find redundant items by a tree of top-level domain label to sub-level.
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`tree` is like { 'com': { 'foo: { 'bar': LEAF },
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'abc': LEAF },
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'org': ... }
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'''
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redundant = []
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tree = {}
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LEAF = 1
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for labels in labelses:
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domain = '.'.join(labels)
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# Init root node as current node
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node = tree
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while len(labels) > 0:
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label = labels.pop()
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if label in node:
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# If child node is a LEAF node,
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# current domain must be an existed domain or a subdomain of an existed.
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if node[label] == LEAF:
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print(f"Redundant found: {domain} at {'.'.join(labels)}")
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redundant.append(domain)
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break
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else:
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# Create a leaf node if current label is last one
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if len(labels) == 0:
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node[label] = LEAF
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# Create a branch node
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else:
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node[label] = {}
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# Iterate to child node
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node = node[label]
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return redundant
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def find_redundant(conf_file):
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return find(load(conf_file))
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if __name__ == '__main__':
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find_redundant('accelerated-domains.china.conf')
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