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editor.py
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/
editor.py
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import os
import shutil
import posixpath
from collections import OrderedDict
from lektor.metaformat import serialize
from lektor.utils import atomic_open, is_valid_id, secure_filename, \
increment_filename
from lektor.environment import PRIMARY_ALT
implied_keys = set(['_id', '_path', '_gid', '_alt', '_source_alt',
'_attachment_for'])
possibly_implied_keys = set(['_model', '_template', '_attachment_type'])
class BadEdit(Exception):
pass
class BadDelete(BadEdit):
pass
def make_editor_session(pad, path, is_attachment=None, alt=PRIMARY_ALT,
datamodel=None):
"""Creates an editor session for the given path object."""
if alt != PRIMARY_ALT and not pad.db.config.is_valid_alternative(alt):
raise BadEdit('Attempted to edit an invalid alternative (%s)' % alt)
raw_data = pad.db.load_raw_data(path, cls=OrderedDict, alt=alt)
id = posixpath.basename(path)
if not is_valid_id(id):
raise BadEdit('Invalid ID')
record = None
exists = raw_data is not None
if raw_data is None:
raw_data = OrderedDict()
if is_attachment is None:
if not exists:
is_attachment = False
else:
is_attachment = bool(raw_data.get('_attachment_for'))
elif bool(raw_data.get('_attachment_for')) != is_attachment:
raise BadEdit('The attachment flag passed is conflicting with the '
'record\'s attachment flag.')
if exists:
# XXX: what about changing the datamodel after the fact?
if datamodel is not None:
raise BadEdit('When editing an existing record, a datamodel '
'must not be provided.')
datamodel = pad.db.get_datamodel_for_raw_data(raw_data, pad)
else:
if datamodel is None:
datamodel = pad.db.get_implied_datamodel(path, is_attachment, pad)
elif isinstance(datamodel, basestring):
datamodel = pad.db.datamodels[datamodel]
if exists:
record = pad.instance_from_data(dict(raw_data), datamodel)
for key in implied_keys:
raw_data.pop(key, None)
return EditorSession(pad, id, unicode(path), raw_data, datamodel, record,
exists, is_attachment, alt)
class EditorSession(object):
def __init__(self, pad, id, path, original_data, datamodel, record,
exists=True, is_attachment=False, alt=PRIMARY_ALT):
self.id = id
self.pad = pad
self.path = path
self.record = record
self.exists = exists
self.original_data = original_data
self.datamodel = datamodel
self.is_root = path.strip('/') == ''
self.alt = alt
slug_format = None
parent_name = posixpath.dirname(path)
if parent_name != path:
parent = pad.get(parent_name)
if parent is not None:
slug_format = parent.datamodel.child_config.slug_format
if slug_format is None:
slug_format = u'{{ this._id }}'
self.slug_format = slug_format
self.implied_attachment_type = None
if is_attachment:
self.implied_attachment_type = pad.db.get_attachment_type(path)
self._data = {}
self._changed = set()
self._delete_this = False
self._recursive_delete = False
self._master_delete = False
self.is_attachment = is_attachment
self.closed = False
def to_json(self):
label = None
label_i18n = None
url_path = None
if self.record is not None:
label = self.record.record_label
label_i18n = self.record.get_record_label_i18n()
url_path = self.record.url_path
else:
label = self.id
can_be_deleted = not self.datamodel.protected and not self.is_root
return {
'data': dict(self.iteritems()),
'record_info': {
'id': self.id,
'path': self.path,
'exists': self.exists,
'label': label,
'label_i18n': label_i18n,
'url_path': url_path,
'alt': self.alt,
'is_attachment': self.is_attachment,
'can_be_deleted': can_be_deleted,
'slug_format': self.slug_format,
'implied_attachment_type': self.implied_attachment_type,
'default_template': self.datamodel.get_default_template_name(),
},
'datamodel': self.datamodel.to_json(self.pad, self.record, self.alt)
}
def __contains__(self, key):
try:
self[key]
return True
except KeyError:
return False
def __getitem__(self, key):
if key in self._data:
rv = self._data[key]
if rv is None:
raise KeyError(key)
return rv
return self.original_data[key]
def __setitem__(self, key, value):
old_value = self.original_data.get(key)
if old_value != value:
self._changed.add(key)
else:
# If the key is in the possibly implied key set and set to
# that value, we will set it to changed anyways. This allows
# overriding of such special keys.
if key in possibly_implied_keys:
self._changed.add(value)
else:
self._changed.discard(value)
self._data[key] = value
def __delitem__(self, key):
self[key] = None
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, tb):
if exc_type is not None:
self.rollback()
else:
self.commit()
def update(self, *args, **kwargs):
for key, value in dict(*args, **kwargs).iteritems():
self[key] = value
def iteritems(self):
done = set()
for key, value in self.original_data.iteritems():
done.add(key)
if key in implied_keys:
continue
if key in self._changed:
value = self._data[key]
if value is not None:
yield key, value
for key in sorted(self._data):
if key in done:
continue
value = self._data.get(key)
if value is not None:
yield key, value
def iterkeys(self):
for key, _ in self.iteritems():
yield key
def itervalues(self):
for _, value in self.iteritems():
yield value
def items(self):
return list(self.iteritems())
def keys(self):
return list(self.iterkeys())
def values(self):
return list(self.itervalues())
__iter__ = iterkeys
def __len__(self):
return len(self.items())
def get_fs_path(self, alt=PRIMARY_ALT):
"""The path to the record file on the file system."""
base = self.pad.db.to_fs_path(self.path)
suffix = '.lr'
if alt != PRIMARY_ALT:
suffix = '+%s%s' % (alt, suffix)
if self.is_attachment:
return base + suffix
return os.path.join(base, 'contents' + suffix)
@property
def fs_path(self):
"""The file system path of the content file on disk."""
return self.get_fs_path(self.alt)
@property
def attachment_fs_path(self):
"""The file system path of the actual attachment."""
if self.is_attachment:
return self.pad.db.to_fs_path(self.path)
def revert_key(self, key):
"""Reverts a key to the implied value."""
if key in self._data:
self._changed.discard(key)
self._data.pop(key, None)
def rollback(self):
"""Ignores all changes and rejects them."""
if self.closed:
return
self.closed = True
def commit(self):
"""Saves changes back to the file system."""
if not self.closed:
if self._delete_this:
self._delete_impl()
else:
self._save_impl()
self.closed = True
def delete(self, recursive=None, delete_master=False):
"""Deletes the record. How the delete works depends on what is being
deleted:
* delete attachment: recursive mode is silently ignored. If
`delete_master` is set then the attachment is deleted, otherwise
only the metadata is deleted.
* delete page: in recursive mode everything is deleted in which
case `delete_master` must be set to `True` or an error is
generated. In fact, the default is to perform a recursive
delete in that case. If `delete_master` is False, then only the
contents file of the current alt is deleted.
If a delete cannot be performed, an error is generated.
"""
if self.closed:
return
if recursive is None:
recursive = not self.is_attachment and delete_master
self._delete_this = True
self._recursive_delete = recursive
self._master_delete = delete_master
def add_attachment(self, filename, fp):
"""Stores a new attachment. Returns `None` if the file already"""
if not self.exists:
raise BadEdit('Record does not exist.')
if self.is_attachment:
raise BadEdit('Cannot attach something to an attachment.')
directory = self.pad.db.to_fs_path(self.path)
safe_filename = secure_filename(filename)
while 1:
fn = os.path.join(directory, safe_filename)
if not os.path.isfile(fn):
break
safe_filename = increment_filename(fn)
with atomic_open(fn, 'w') as f:
shutil.copyfileobj(fp, f)
return safe_filename
def _attachment_delete_impl(self):
files = [self.fs_path]
if self._master_delete:
files.append(self.attachment_fs_path)
for alt in self.pad.db.config.list_alternatives():
files.append(self.get_fs_path(alt))
for fn in files:
try:
os.unlink(fn)
except OSError:
pass
def _page_delete_impl(self):
directory = os.path.dirname(self.fs_path)
if self._recursive_delete:
try:
shutil.rmtree(directory)
except (OSError, IOError):
pass
return
elif self._master_delete:
raise BadDelete('Master deletes of pages require that recursive '
'deleting is enabled.')
for fn in self.fs_path, directory:
try:
os.unlink(fn)
except OSError:
pass
def _delete_impl(self):
if self.alt != PRIMARY_ALT:
if self._master_delete:
raise BadDelete('Master deletes need to be done from the primary '
'alt. Tried to delete from "%s"' % self.alt)
if self._recursive_delete:
raise BadDelete('Cannot perform recursive delete from a non '
'primary alt. Tried to delete from "%s"' %
self.alt)
if self.is_attachment:
self._attachment_delete_impl()
else:
self._page_delete_impl()
def _save_impl(self):
# When creating a new alt from a primary self.exists is True but
# the file does not exist yet. In this case we want to explicitly
# create it anyways instead of bailing.
if not self._changed and self.exists and os.path.exists(self.fs_path):
return
try:
os.makedirs(os.path.dirname(self.fs_path))
except OSError:
pass
with atomic_open(self.fs_path, 'wb') as f:
for chunk in serialize(self.iteritems(), encoding='utf-8'):
f.write(chunk)
def __repr__(self):
return '<%s %r%s%s>' % (
self.__class__.__name__,
self.path,
self.alt != PRIMARY_ALT and ' alt=%r' % self.alt or '',
not self.exists and ' new' or '',
)