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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
__metaclass__ = type
from datetime import datetime
import time
from twisted.web import resource, static, util, server, proxy
from twisted.internet.threads import deferToThread
from canonical.librarian.client import url_path_quote
from canonical.librarian.db import read_transaction, write_transaction
from canonical.librarian.utils import guess_librarian_encoding
defaultResource = static.Data("""
<html>
<body>
<h1>Launchpad Librarian</h1>
<p>
http://librarian.launchpad.net/ is a
file repository used by <a href="https://launchpad.net/">Launchpad</a>.
</p>
<p><small>Copyright 2004-2009 Canonical Ltd.</small></p>
<!-- kthxbye. -->
</body></html>
""", type='text/html')
fourOhFour = resource.NoResource('No such resource')
class NotFound(Exception):
pass
class LibraryFileResource(resource.Resource):
def __init__(self, storage, upstreamHost, upstreamPort):
resource.Resource.__init__(self)
self.storage = storage
self.upstreamHost = upstreamHost
self.upstreamPort = upstreamPort
def getChild(self, name, request):
if name == '':
# Root resource
return defaultResource
try:
aliasID = int(name)
except ValueError:
return fourOhFour
return LibraryFileAliasResource(self.storage, aliasID,
self.upstreamHost, self.upstreamPort)
class LibraryFileAliasResource(resource.Resource):
def __init__(self, storage, aliasID, upstreamHost, upstreamPort):
resource.Resource.__init__(self)
self.storage = storage
self.aliasID = aliasID
self.upstreamHost = upstreamHost
self.upstreamPort = upstreamPort
def getChild(self, filename, request):
# If we still have another component of the path, then we have
# an old URL that encodes the content ID. We want to keep supporting
# these, so we just ignore the content id that is currently in
# self.aliasID and extract the real one from the URL.
if len(request.postpath) == 1:
try:
self.aliasID = int(filename)
except ValueError:
return fourOhFour
filename = request.postpath[0]
deferred = deferToThread(self._getFileAlias, self.aliasID)
deferred.addCallback(
self._cb_getFileAlias, filename, request
)
deferred.addErrback(self._eb_getFileAlias)
return util.DeferredResource(deferred)
@write_transaction
def _getFileAlias(self, aliasID):
try:
alias = self.storage.getFileAlias(aliasID)
alias.updateLastAccessed()
return (alias.contentID, alias.filename,
alias.mimetype, alias.date_created)
except LookupError:
raise NotFound
def _eb_getFileAlias(self, failure):
failure.trap(NotFound)
return fourOhFour
def _cb_getFileAlias(
self, (dbcontentID, dbfilename, mimetype, date_created),
filename, request
):
# Return a 404 if the filename in the URL is incorrect. This offers
# a crude form of access control (stuff we care about can have
# unguessable names effectively using the filename as a secret).
if dbfilename.encode('utf-8') != filename:
return fourOhFour
# Set our caching headers. Librarian files can be cached forever.
request.setHeader('Cache-Control', 'max-age=31536000, public')
if self.storage.hasFile(dbcontentID) or self.upstreamHost is None:
# XXX: Brad Crittenden 2007-12-05 bug=174204: When encodings are
# stored as part of a file's metadata this logic will be replaced.
encoding, mimetype = guess_librarian_encoding(filename, mimetype)
return File(
mimetype, encoding, date_created,
self.storage._fileLocation(dbcontentID))
else:
return proxy.ReverseProxyResource(self.upstreamHost,
self.upstreamPort, request.path)
def render_GET(self, request):
return defaultResource.render(request)
class File(static.File):
isLeaf = True
def __init__(
self, contentType, encoding, modification_time, *args, **kwargs):
# Have to convert the UTC datetime to POSIX timestamp (localtime)
offset = datetime.utcnow() - datetime.now()
local_modification_time = modification_time - offset
self._modification_time = time.mktime(
local_modification_time.timetuple())
static.File.__init__(self, *args, **kwargs)
self.type = contentType
self.encoding = encoding
def getModificationTime(self):
"""Override the time on disk with the time from the database.
This is used by twisted to set the Last-Modified: header.
"""
return self._modification_time
class DigestSearchResource(resource.Resource):
def __init__(self, storage):
self.storage = storage
resource.Resource.__init__(self)
def render_GET(self, request):
try:
digest = request.args['digest'][0]
except LookupError:
return static.Data('Bad search', 'text/plain').render(request)
deferred = deferToThread(self._matchingAliases, digest)
deferred.addCallback(self._cb_matchingAliases, request)
deferred.addErrback(_eb, request)
return server.NOT_DONE_YET
@read_transaction
def _matchingAliases(self, digest):
library = self.storage.library
matches = ['%s/%s' % (aID, url_path_quote(aName))
for fID in library.lookupBySHA1(digest)
for aID, aName, aType in library.getAliases(fID)]
return matches
def _cb_matchingAliases(self, matches, request):
text = '\n'.join([str(len(matches))] + matches)
response = static.Data(text.encode('utf-8'),
'text/plain; charset=utf-8').render(request)
request.write(response)
request.finish()
# Ask robots not to index or archive anything in the librarian.
robotsTxt = static.Data("""
User-agent: *
Disallow: /
""", type='text/plain')
def _eb(failure, request):
"""Generic errback for failures during a render_GET."""
request.processingFailed(failure)
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