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https://github.com/tahoe-lafs/tahoe-lafs.git
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6e8477114e
Impose micro-POLA by passing only the writekey instead of the whole node object to {{{_encrypt_rw_uri()}}}. Remove DummyImmutableFileNode in nodemaker.py, which is obviated by this. Add micro-optimization by precomputing the netstring of the empty string and branching on whether the writekey is present or not outside of {{{_encrypt_rw_uri()}}}. Add doc about writekey to docstring.
fixes #967
109 lines
4.8 KiB
Python
109 lines
4.8 KiB
Python
import weakref
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from zope.interface import implements
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from allmydata.interfaces import INodeMaker
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from allmydata.immutable.filenode import ImmutableFileNode, LiteralFileNode
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from allmydata.immutable.upload import Data
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from allmydata.mutable.filenode import MutableFileNode
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from allmydata.dirnode import DirectoryNode, pack_children
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from allmydata.unknown import UnknownNode
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from allmydata import uri
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class NodeMaker:
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implements(INodeMaker)
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def __init__(self, storage_broker, secret_holder, history,
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uploader, downloader, download_cache_dirman,
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default_encoding_parameters, key_generator):
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self.storage_broker = storage_broker
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self.secret_holder = secret_holder
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self.history = history
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self.uploader = uploader
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self.downloader = downloader
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self.download_cache_dirman = download_cache_dirman
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self.default_encoding_parameters = default_encoding_parameters
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self.key_generator = key_generator
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self._node_cache = weakref.WeakValueDictionary() # uri -> node
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def _create_lit(self, cap):
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return LiteralFileNode(cap)
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def _create_immutable(self, cap):
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return ImmutableFileNode(cap, self.storage_broker, self.secret_holder,
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self.downloader, self.history,
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self.download_cache_dirman)
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def _create_mutable(self, cap):
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n = MutableFileNode(self.storage_broker, self.secret_holder,
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self.default_encoding_parameters,
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self.history)
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return n.init_from_cap(cap)
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def _create_dirnode(self, filenode):
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return DirectoryNode(filenode, self, self.uploader)
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def create_from_cap(self, writecap, readcap=None, deep_immutable=False, name=u"<unknown name>"):
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# this returns synchronously. It starts with a "cap string".
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assert isinstance(writecap, (str, type(None))), type(writecap)
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assert isinstance(readcap, (str, type(None))), type(readcap)
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bigcap = writecap or readcap
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if not bigcap:
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# maybe the writecap was hidden because we're in a readonly
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# directory, and the future cap format doesn't have a readcap, or
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# something.
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return UnknownNode(None, None) # deep_immutable and name not needed
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# The name doesn't matter for caching since it's only used in the error
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# attribute of an UnknownNode, and we don't cache those.
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if deep_immutable:
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memokey = "I" + bigcap
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else:
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memokey = "M" + bigcap
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if memokey in self._node_cache:
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return self._node_cache[memokey]
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cap = uri.from_string(bigcap, deep_immutable=deep_immutable, name=name)
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node = self._create_from_single_cap(cap)
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if node:
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self._node_cache[memokey] = node # note: WeakValueDictionary
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else:
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# don't cache UnknownNode
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node = UnknownNode(writecap, readcap, deep_immutable=deep_immutable, name=name)
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return node
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def _create_from_single_cap(self, cap):
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if isinstance(cap, uri.LiteralFileURI):
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return self._create_lit(cap)
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if isinstance(cap, uri.CHKFileURI):
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return self._create_immutable(cap)
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if isinstance(cap, (uri.ReadonlySSKFileURI, uri.WriteableSSKFileURI)):
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return self._create_mutable(cap)
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if isinstance(cap, (uri.DirectoryURI,
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uri.ReadonlyDirectoryURI,
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uri.ImmutableDirectoryURI,
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uri.LiteralDirectoryURI)):
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filenode = self._create_from_single_cap(cap.get_filenode_cap())
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return self._create_dirnode(filenode)
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return None
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def create_mutable_file(self, contents=None, keysize=None):
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n = MutableFileNode(self.storage_broker, self.secret_holder,
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self.default_encoding_parameters, self.history)
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d = self.key_generator.generate(keysize)
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d.addCallback(n.create_with_keys, contents)
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d.addCallback(lambda res: n)
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return d
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def create_new_mutable_directory(self, initial_children={}):
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d = self.create_mutable_file(lambda n:
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pack_children(initial_children, n.get_writekey()))
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d.addCallback(self._create_dirnode)
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return d
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def create_immutable_directory(self, children, convergence=None):
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if convergence is None:
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convergence = self.secret_holder.get_convergence_secret()
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packed = pack_children(children, None, deep_immutable=True)
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uploadable = Data(packed, convergence)
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d = self.uploader.upload(uploadable, history=self.history)
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d.addCallback(lambda results: self.create_from_cap(None, results.uri))
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d.addCallback(self._create_dirnode)
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return d
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