X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/python-afs.git/blobdiff_plain/c7607e2c1d074431922b99adb8b83c3fa8c16ae7..09b4d45674f9d37d44c68f52c9a965b14b7e336f:/afs/acl.py

diff --git a/afs/acl.py b/afs/acl.py
index da0821f..a5293bd 100644
--- a/afs/acl.py
+++ b/afs/acl.py
@@ -5,18 +5,20 @@ from _acl import getCallerAccess
 
 _canonical = {
     "read": "rl",
-    "write": "rwlidwk",
-    "all": "rwlidwka",
+    "write": "rlidwk",
+    "all": "rlidwka",
     "mail": "lik",
     "none": "",
 }
 
+_reverseCanonical = dict((y, x) for (x, y) in _canonical.iteritems())
+
 _charBitAssoc = [
     ('r', READ),
-    ('w', WRITE),
-    ('i', INSERT),
     ('l', LOOKUP),
+    ('i', INSERT),
     ('d', DELETE),
+    ('w', WRITE),
     ('k', LOCK),
     ('a', ADMINISTER),
     ('A', USR0),
@@ -32,6 +34,13 @@ _charBitAssoc = [
 _char2bit = dict(_charBitAssoc)
 
 
+def rightsToEnglish(s):
+    """Turns a rlwidwka string into a canonical name if possible"""
+    if s in _reverseCanonical:
+        return _reverseCanonical[s]
+    else:
+        return ''
+
 def readRights(s):
     """Canonicalizes string rights to bitmask"""
     if s in _canonical: s = _canonical[s]
@@ -70,6 +79,16 @@ def _parseAcl(inp):
             neg[name] = int(acl)
     return (pos, neg)
 
+def _unparseAcl(pos, neg):
+    npos = len(pos)
+    nneg = len(neg)
+    acl = "%d\n%d\n" % (npos, nneg)
+    for p in pos.items():
+        acl += "%s\t%d\n" % p
+    for n in neg.items():
+        acl += "%s\t%d\n" % n
+    return acl
+
 class ACL(object):
     def __init__(self, pos, neg):
         """
@@ -81,8 +100,31 @@ class ACL(object):
         self.pos = pos
         self.neg = neg
     @staticmethod
-    def retrieve(dir, follow=1):
+    def retrieve(dir, follow=True):
         """Retrieve the ACL for an AFS directory"""
         pos, neg = _parseAcl(_acl.getAcl(dir, follow))
         return ACL(pos, neg)
-
+    def apply(self, dir, follow=True):
+        """Apply the ACL to a directory"""
+        self._clean()
+        _acl.setAcl(dir, _unparseAcl(self.pos, self.neg), follow)
+    def _clean(self):
+        """Clean an ACL by removing any entries whose bitmask is 0"""
+        for n,a in self.pos.items():
+            if a == 0:
+                del self.pos[n]
+        for n,a in self.neg.items():
+            if a == 0:
+                del self.neg[n]
+    def set(self, user, bitmask, negative=False):
+        """Set the bitmask for a given user"""
+        if bitmask < 0 or bitmask > max(_char2bit.values()):
+            raise ValueError, "Invalid bitmask"
+        if negative:
+            self.neg[user] = bitmask
+        else:
+            self.pos[user] = bitmask
+    def remove(self, user, negative=False):
+        """Convenience function to removeSet the bitmask for a given user"""
+        self.set(user, 0, negative)
+