author | Paul Crowley <paul@lshift.net> |
Mon, 09 Nov 2009 17:13:37 +0000 (2009-11-09) | |
changeset 177 | fb6587ce93c6 |
parent 109 | 72100d3ed1bd |
child 237 | d30f3f312ece |
permissions | -rw-r--r-- |
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# Copyright 2008-2009 LShift Ltd |
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# Author(s): |
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# Paul Crowley <paul@lshift.net> |
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# |
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# This software may be used and distributed according to the terms |
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# of the GNU General Public License, incorporated herein by reference. |
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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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allowedchars = "A-Za-z0-9_-" |
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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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rex = re.compile(p.replace("[^/]*[^/]*", ".*") + "$") |
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# None matches everything |
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return lambda x: x is None or rex.match(x) is not 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 or not m(kw[k]): |
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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 matchrule(self, kw): |
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d = self.preset.copy() |
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d.update(kw) |
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for a, c in self.rules: |
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if c(d): |
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return a |
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return None |
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def allow(self, level, **kw): |
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a = self.matchrule(kw) |
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return a in self.levels and self.levels.index(a) <= self.levels.index(level) |
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def readfile(self, fn): |
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try: |
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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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f.close() |
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except Exception, e: |
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print >> sys.stderr, "Failure reading rules file:", e |
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rules = Ruleset() |
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