author | Paul Crowley <paul@lshift.net> |
Sun, 19 Dec 2010 09:49:18 +0000 | |
branch | debian |
changeset 294 | 31d5c6236f71 |
parent 242 | 03d8f07230b3 |
child 297 | 9875791ab421 |
permissions | -rw-r--r-- |
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""" |
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Glob-based, order-based rules matcher that can answer "maybe" |
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where the inputs make clear that something is unknown. |
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""" |
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import sys |
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import re |
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import os |
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import os.path |
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|
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def globmatcher(pattern): |
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p = "[^/]*".join(re.escape(c) for c in pattern.split("*")) |
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# ** means "match recursively" ie "ignore directories" |
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return re.compile(p.replace("[^/]*[^/]*", ".*") + "$") |
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# Returns True for a definite match |
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# False for a definite non-match |
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# None where we can't be sure because a key is None |
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def rule(pairs): |
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matchers = [(k, globmatcher(v)) for k, v in pairs] |
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def c(kw): |
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for k, m in matchers: |
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if k not in kw: |
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return False |
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kkw = kw[k] |
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if kkw is None: |
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return None |
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if m.match(kkw) is None: |
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return False |
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return True |
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return c |
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class Ruleset(object): |
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'''Class representing the rules in a rule file''' |
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levels = ["init", "write", "read", "deny"] |
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def __init__(self): |
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self.rules = [] |
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self.preset = {} |
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def add(self, action, conditions): |
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self.rules.append((action, conditions)) |
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def set(self, **kw): |
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self.preset.update(kw) |
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def get(self, k): |
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return self.preset.get(k, None) |
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def matchrules(self, kw): |
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d = self.preset.copy() |
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d.update(kw) |
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res = set() |
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for a, c in self.rules: |
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m = c(d) |
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if m is None: |
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# "Maybe match" - add it and carry on |
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res.add(a) |
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elif m: |
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# Definite match - add it and stop |
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res.add(a) |
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break |
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return res |
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def allow(self, level, **kw): |
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for a in self.matchrules(kw): |
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if a in self.levels: |
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if self.levels.index(a) <= self.levels.index(level): |
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return True |
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return False |
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def readfile(self, fn): |
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f = open(fn) |
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try: |
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for l in f: |
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l = l.strip() |
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if len(l) == 0 or l.startswith("#"): |
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continue |
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l = l.split() |
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self.add(l[0], rule([c.split("=", 1) for c in l[1:]])) |
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finally: |
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f.close() |
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rules = Ruleset() |
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