289 lines
10 KiB
Python
289 lines
10 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Canonical Ltd.
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import email
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from email.mime.base import MIMEBase
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from email.mime.multipart import MIMEMultipart
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from email.mime.text import MIMEText
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from cloudinit import handlers
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from cloudinit import log as logging
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from cloudinit import util
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LOG = logging.getLogger(__name__)
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# Constants copied in from the handler module
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NOT_MULTIPART_TYPE = handlers.NOT_MULTIPART_TYPE
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PART_FN_TPL = handlers.PART_FN_TPL
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OCTET_TYPE = handlers.OCTET_TYPE
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# Saves typing errors
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CONTENT_TYPE = 'Content-Type'
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# Various special content types that cause special actions
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TYPE_NEEDED = ["text/plain", "text/x-not-multipart"]
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INCLUDE_TYPES = ['text/x-include-url', 'text/x-include-once-url']
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ARCHIVE_TYPES = ["text/cloud-config-archive"]
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UNDEF_TYPE = "text/plain"
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ARCHIVE_UNDEF_TYPE = "text/cloud-config"
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# Msg header used to track attachments
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ATTACHMENT_FIELD = 'Number-Attachments'
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# Only the following content types can have there launch index examined
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# in there payload, evey other content type can still provide a header
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EXAMINE_FOR_LAUNCH_INDEX = ["text/cloud-config"]
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class UserDataProcessor(object):
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def __init__(self, paths):
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self.paths = paths
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self.ssl_details = util.fetch_ssl_details(paths)
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def process(self, blob):
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accumulating_msg = MIMEMultipart()
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self._process_msg(convert_string(blob), accumulating_msg)
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return accumulating_msg
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def _process_msg(self, base_msg, append_msg):
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for part in base_msg.walk():
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if is_skippable(part):
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continue
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ctype = None
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ctype_orig = part.get_content_type()
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payload = part.get_payload(decode=True)
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if not ctype_orig:
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ctype_orig = UNDEF_TYPE
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if ctype_orig in TYPE_NEEDED:
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ctype = handlers.type_from_starts_with(payload)
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if ctype is None:
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ctype = ctype_orig
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if ctype != ctype_orig:
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if CONTENT_TYPE in part:
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part.replace_header(CONTENT_TYPE, ctype)
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else:
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part[CONTENT_TYPE] = ctype
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if ctype in INCLUDE_TYPES:
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self._do_include(payload, append_msg)
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continue
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if ctype in ARCHIVE_TYPES:
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self._explode_archive(payload, append_msg)
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continue
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# Should this be happening, shouldn't
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# the part header be modified and not the base?
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if CONTENT_TYPE in base_msg:
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base_msg.replace_header(CONTENT_TYPE, ctype)
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else:
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base_msg[CONTENT_TYPE] = ctype
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self._attach_part(append_msg, part)
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def _attach_launch_index(self, msg):
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header_idx = msg.get('Launch-Index', None)
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payload_idx = None
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if msg.get_content_type() in EXAMINE_FOR_LAUNCH_INDEX:
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try:
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# See if it has a launch-index field
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# that might affect the final header
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payload = util.load_yaml(msg.get_payload(decode=True))
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if payload:
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payload_idx = payload.get('launch-index')
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except:
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pass
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# Header overrides contents, for now (?) or the other way around?
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if header_idx is not None:
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payload_idx = header_idx
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# Nothing found in payload, use header (if anything there)
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if payload_idx is None:
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payload_idx = header_idx
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if payload_idx is not None:
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try:
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msg.add_header('Launch-Index', str(int(payload_idx)))
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except (ValueError, TypeError):
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pass
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def _get_include_once_filename(self, entry):
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entry_fn = util.hash_blob(entry, 'md5', 64)
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return os.path.join(self.paths.get_ipath_cur('data'),
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'urlcache', entry_fn)
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def _process_before_attach(self, msg, attached_id):
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if not msg.get_filename():
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msg.add_header('Content-Disposition',
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'attachment', filename=PART_FN_TPL % (attached_id))
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self._attach_launch_index(msg)
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def _do_include(self, content, append_msg):
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# Include a list of urls, one per line
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# also support '#include <url here>'
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# or #include-once '<url here>'
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include_once_on = False
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for line in content.splitlines():
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lc_line = line.lower()
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if lc_line.startswith("#include-once"):
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line = line[len("#include-once"):].lstrip()
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# Every following include will now
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# not be refetched.... but will be
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# re-read from a local urlcache (if it worked)
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include_once_on = True
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elif lc_line.startswith("#include"):
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line = line[len("#include"):].lstrip()
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# Disable the include once if it was on
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# if it wasn't, then this has no effect.
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include_once_on = False
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if line.startswith("#"):
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continue
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include_url = line.strip()
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if not include_url:
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continue
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include_once_fn = None
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content = None
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if include_once_on:
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include_once_fn = self._get_include_once_filename(include_url)
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if include_once_on and os.path.isfile(include_once_fn):
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content = util.load_file(include_once_fn)
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else:
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resp = util.read_file_or_url(include_url,
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ssl_details=self.ssl_details)
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if include_once_on and resp.ok():
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util.write_file(include_once_fn, str(resp), mode=0600)
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if resp.ok():
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content = str(resp)
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else:
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LOG.warn(("Fetching from %s resulted in"
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" a invalid http code of %s"),
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include_url, resp.code)
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if content is not None:
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new_msg = convert_string(content)
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self._process_msg(new_msg, append_msg)
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def _explode_archive(self, archive, append_msg):
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entries = util.load_yaml(archive, default=[], allowed=(list, set))
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for ent in entries:
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# ent can be one of:
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# dict { 'filename' : 'value', 'content' :
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# 'value', 'type' : 'value' }
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# filename and type not be present
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# or
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# scalar(payload)
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if isinstance(ent, (str, basestring)):
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ent = {'content': ent}
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if not isinstance(ent, (dict)):
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# TODO(harlowja) raise?
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continue
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content = ent.get('content', '')
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mtype = ent.get('type')
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if not mtype:
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mtype = handlers.type_from_starts_with(content,
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ARCHIVE_UNDEF_TYPE)
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maintype, subtype = mtype.split('/', 1)
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if maintype == "text":
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msg = MIMEText(content, _subtype=subtype)
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else:
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msg = MIMEBase(maintype, subtype)
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msg.set_payload(content)
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if 'filename' in ent:
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msg.add_header('Content-Disposition',
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'attachment', filename=ent['filename'])
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if 'launch-index' in ent:
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msg.add_header('Launch-Index', str(ent['launch-index']))
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for header in list(ent.keys()):
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if header in ('content', 'filename', 'type', 'launch-index'):
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continue
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msg.add_header(header, ent[header])
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self._attach_part(append_msg, msg)
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def _multi_part_count(self, outer_msg, new_count=None):
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"""
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Return the number of attachments to this MIMEMultipart by looking
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at its 'Number-Attachments' header.
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"""
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if ATTACHMENT_FIELD not in outer_msg:
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outer_msg[ATTACHMENT_FIELD] = '0'
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if new_count is not None:
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outer_msg.replace_header(ATTACHMENT_FIELD, str(new_count))
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fetched_count = 0
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try:
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fetched_count = int(outer_msg.get(ATTACHMENT_FIELD))
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except (ValueError, TypeError):
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outer_msg.replace_header(ATTACHMENT_FIELD, str(fetched_count))
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return fetched_count
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def _attach_part(self, outer_msg, part):
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"""
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Attach a message to an outer message. outermsg must be a MIMEMultipart.
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Modifies a header in the outer message to keep track of number of attachments.
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"""
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part_count = self._multi_part_count(outer_msg)
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self._process_before_attach(part, part_count + 1)
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outer_msg.attach(part)
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self._multi_part_count(outer_msg, part_count + 1)
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def is_skippable(part):
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# multipart/* are just containers
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part_maintype = part.get_content_maintype() or ''
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if part_maintype.lower() == 'multipart':
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return True
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return False
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# Coverts a raw string into a mime message
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def convert_string(raw_data, headers=None):
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if not raw_data:
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raw_data = ''
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if not headers:
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headers = {}
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data = util.decomp_gzip(raw_data)
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if "mime-version:" in data[0:4096].lower():
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msg = email.message_from_string(data)
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for (key, val) in headers.iteritems():
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if key in msg:
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msg.replace_header(key, val)
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else:
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msg[key] = val
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else:
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mtype = headers.get(CONTENT_TYPE, NOT_MULTIPART_TYPE)
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maintype, subtype = mtype.split("/", 1)
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msg = MIMEBase(maintype, subtype, *headers)
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msg.set_payload(data)
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return msg
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