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#!/usr/bin/python
# -*- coding: utf-8 -*-
import datetime
import os
import re
import thread
import werkzeug
import StringIO
# Note: we have to set these before importing Mercurial
os.environ['HGENCODING'] = 'utf-8'
import mercurial.commands
import mercurial.hg
import mercurial.hgweb
import mercurial.merge
import mercurial.revlog
import mercurial.ui
import mercurial.util
import mercurial.simplemerge
from hatta import error
from hatta import page
class StorageError(Exception):
"""Thrown when there are problems with configuration of storage."""
def locked_repo(func):
"""A decorator for locking the repository when calling a method."""
def new_func(self, *args, **kwargs):
"""Wrap the original function in locks."""
wlock = self.repo.wlock()
lock = self.repo.lock()
try:
func(self, *args, **kwargs)
finally:
lock.release()
wlock.release()
return new_func
def _get_ui():
try:
ui = mercurial.ui.ui(report_untrusted=False,
interactive=False, quiet=True)
except TypeError:
# Mercurial 1.3 changed the way we setup the ui object.
ui = mercurial.ui.ui()
ui.quiet = True
ui._report_untrusted = False
ui.setconfig('ui', 'interactive', False)
return ui
def merge_func(base, other, this):
"""Used for merging edit conflicts."""
if (mercurial.util.binary(this) or mercurial.util.binary(base) or
mercurial.util.binary(other)):
raise ValueError("can't merge binary data")
m3 = mercurial.simplemerge.Merge3Text(base, this, other)
return ''.join(m3.merge_lines(start_marker='<<<<<<< local',
mid_marker='=======',
end_marker='>>>>>>> other',
base_marker=None))
def _get_datetime(filectx):
"""
Create a datetime object for the changeset's cretion time, taking into
account the timezones.
"""
timestamp, offset = filectx.date()
date = datetime.datetime.fromtimestamp(timestamp + offset)
return date
class WikiStorage(object):
"""
Provides means of storing wiki pages and keeping track of their
change history, using Mercurial repository as the storage method.
"""
def __init__(self, path, charset=None, _=lambda x: x, unix_eol=False,
extension=None, repo_path=None):
"""
Takes the path to the directory where the pages are to be kept.
If the directory doesn't exist, it will be created. If it's inside
a Mercurial repository, that repository will be used, otherwise
a new repository will be created in it.
"""
self._ = _
self.charset = charset or 'utf-8'
self.unix_eol = unix_eol
self.extension = extension
self.path = os.path.abspath(path)
if not os.path.exists(self.path):
os.makedirs(self.path)
self.ui = _get_ui()
if repo_path is None:
self.repo_path = self.path
else:
self.repo_path = os.path.abspath(repo_path)
if not self.path.startswith(self.repo_path):
raise StorageError(
"Page path %r is outside of the repository path %r." % (
self.path, self.repo_path))
self.repo_prefix = self.path[len(self.repo_path):].strip('/')
if not os.path.exists(os.path.join(self.repo_path, '.hg')):
# Create the repository if needed.
mercurial.hg.repository(self.ui, self.repo_path, create=True)
self._repos = {}
self._tips = {}
def reopen(self):
"""Close and reopen the repo, to make sure we are up to date."""
self._repos = {}
self._tips = {}
@property
def repo(self):
"""Keep one open repository per thread."""
thread_id = thread.get_ident()
try:
return self._repos[thread_id]
except KeyError:
repo = mercurial.hg.repository(self.ui, self.repo_path)
self._repos[thread_id] = repo
return repo
def _title_to_file(self, title):
title = unicode(title).strip()
filename = werkzeug.url_quote(title, safe='')
# Escape special windows filenames and dot files
_windows_device_files = ('CON', 'AUX', 'COM1', 'COM2', 'COM3',
'COM4', 'LPT1', 'LPT2', 'LPT3', 'PRN',
'NUL')
if (filename.split('.')[0].upper() in _windows_device_files or
filename.startswith('_') or filename.startswith('.')):
filename = '_' + filename
if page.page_mime(title) == 'text/x-wiki' and self.extension:
filename += self.extension
return os.path.join(self.repo_prefix, filename)
def _file_to_title(self, filepath):
_ = self._
if not filepath.startswith(self.repo_prefix):
raise error.ForbiddenErr(
_(u"Can't read or write outside of the pages repository"))
name = filepath[len(self.repo_prefix):].strip('/')
# Un-escape special windows filenames and dot files
if name.startswith('_') and len(name) > 1:
name = name[1:]
if self.extension and name.endswith(self.extension):
name = name[:-len(self.extension)]
return werkzeug.url_unquote(name)
def __contains__(self, title):
repo_file = self._title_to_file(title)
return repo_file in self._changectx()
def __iter__(self):
return self.all_pages()
def _get_parents(self, filename, parent_rev):
if parent_rev is None:
return 'tip', None
try:
filetip = self._changectx()[filename]
except mercurial.revlog.LookupError:
if parent_rev != -1:
raise IndexError("no such parent revision %r" % parent_rev)
return ('tip', None)
last_rev = filetip.filerev()
if parent_rev > last_rev:
raise IndexError("no such parent revision %r" % parent_rev)
if parent_rev == last_rev:
return ('tip', None)
return parent_rev, last_rev
def _merge(self, repo_file, parent, other, data):
filetip = self._changectx()[repo_file]
parent_data = filetip.filectx(parent).data()
other_data = filetip.filectx(other).data()
return merge_func(parent_data, other_data, data)
def save_data(self, title, data, author=None, comment=None, parent_rev=None):
"""Save a new revision of the page. If the data is None, deletes it."""
self.reopen() # Make sure we are at the tip.
_ = self._
user = (author or _(u'anon')).encode('utf-8')
text = (comment or _(u'comment')).encode('utf-8')
repo_file = self._title_to_file(title)
parent, other = self._get_parents(repo_file, parent_rev)
if data is None:
if title not in self:
raise error.ForbiddenErr()
else:
if other is not None:
try:
data = self._merge(repo_file, parent, other, data)
except ValueError:
text = _(u'failed merge of edit conflict').encode('utf-8')
def filectxfn(repo, memctx, path):
if data is None:
raise IOError()
return mercurial.context.memfilectx(path, data, False, False, None)
ctx = mercurial.context.memctx(
repo=self.repo,
parents=(parent, other),
text=text,
files=[repo_file],
filectxfn=filectxfn,
user=user,
)
self.repo.commitctx(ctx)
self._tips = {}
def delete_page(self, title, author, comment):
self.save_data(title, None, author, comment)
def save_text(self, title, text, author=u'', comment=u'', parent=None):
"""Save text as specified page, encoded to charset."""
data = text.encode(self.charset)
if self.unix_eol:
data = data.replace('\r\n', '\n')
self.save_data(title, data, author, comment, parent)
def page_text(self, title):
"""Read unicode text of a page."""
data = self.page_data(title)
text = unicode(data, self.charset, 'replace')
return text
def open_page(self, title):
"""Open the page and return a file-like object with its contents."""
return StringIO.StringIO(self.page_data(title))
def page_data(self, title):
repo_file = self._title_to_file(title)
try:
filetip = self._changectx()[repo_file]
except mercurial.revlog.LookupError:
raise error.NotFoundErr()
return filetip.data()
def page_meta(self, title):
"""Get page's revision, date, last editor and his edit comment."""
filectx_tip = self._find_filectx(title)
if filectx_tip is None:
raise error.NotFoundErr()
#return -1, None, u'', u''
rev = filectx_tip.filerev()
filectx = filectx_tip.filectx(rev)
date = _get_datetime(filectx)
author = unicode(filectx.user(), "utf-8",
'replace').split('<')[0].strip()
comment = unicode(filectx.description(), "utf-8", 'replace')
return rev, date, author, comment
def repo_revision(self):
"""Give the latest revision of the repository."""
return self._changectx().rev()
def _changectx(self):
"""Get the changectx of the tip."""
thread_id = thread.get_ident()
try:
return self._tips[thread_id]
except KeyError:
try:
# This is for Mercurial 1.0
tip = self.repo.changectx()
except TypeError:
# Mercurial 1.3 (and possibly earlier) needs an argument
tip = self.repo.changectx('tip')
self._tips[thread_id] = tip
return tip
def _find_filectx(self, title):
"""Find the last revision in which the file existed."""
repo_file = self._title_to_file(title)
stack = [self._changectx()]
while stack:
changectx = stack.pop()
if repo_file in changectx:
return changectx[repo_file]
if changectx.rev() == 0:
return None
for parent in changectx.parents():
if parent != changectx:
stack.append(parent)
return None
def page_history(self, title):
"""Iterate over the page's history."""
filectx_tip = self._find_filectx(title)
if filectx_tip is None:
return
maxrev = filectx_tip.filerev()
minrev = 0
for rev in range(maxrev, minrev - 1, -1):
filectx = filectx_tip.filectx(rev)
date = _get_datetime(filectx)
author = unicode(filectx.user(), "utf-8",
'replace').split('<')[0].strip()
comment = unicode(filectx.description(), "utf-8", 'replace')
yield rev, date, author, comment
def page_revision(self, title, rev):
"""Get binary content of the specified revision of the page."""
filectx_tip = self._find_filectx(title)
if filectx_tip is None:
raise error.NotFoundErr()
try:
data = filectx_tip.filectx(rev).data()
except LookupError:
raise error.NotFoundErr()
return data
def revision_text(self, title, rev):
"""Get unicode text of the specified revision of the page."""
data = self.page_revision(title, rev)
text = unicode(data, self.charset, 'replace')
return text
def history(self):
"""Iterate over the history of entire wiki."""
changectx = self._changectx()
maxrev = changectx.rev()
minrev = 0
for wiki_rev in range(maxrev, minrev - 1, -1):
change = self.repo.changectx(wiki_rev)
date = _get_datetime(change)
author = unicode(change.user(), "utf-8",
'replace').split('<')[0].strip()
comment = unicode(change.description(), "utf-8", 'replace')
for repo_file in change.files():
if repo_file.startswith(self.repo_prefix):
title = self._file_to_title(repo_file)
try:
rev = change[repo_file].filerev()
except mercurial.revlog.LookupError:
rev = -1
yield title, rev, date, author, comment
def all_pages(self):
"""Iterate over the titles of all pages in the wiki."""
for repo_file in self._changectx():
if (repo_file.startswith(self.repo_prefix) and
'/' not in repo_file[len(self.repo_prefix):]):
title = self._file_to_title(repo_file)
if title in self:
yield title
def changed_since(self, rev):
"""
Return all pages that changed since specified repository revision.
"""
try:
last = self.repo.lookup(int(rev))
except IndexError:
for page in self.all_pages():
yield page
return
current = self.repo.lookup('tip')
status = self.repo.status(current, last)
modified, added, removed, deleted, unknown, ignored, clean = status
for filename in modified + added + removed + deleted:
if filename.startswith(self.repo_prefix):
yield self._file_to_title(filename)
class WikiSubdirectoryStorage(WikiStorage):
"""
A version of WikiStorage that keeps the subpages in real subdirectories in
the filesystem. Indexes supported.
"""
periods_re = re.compile(r'^[.]|(?<=/)[.]')
slashes_re = re.compile(r'^[/]|(?<=/)[/]')
# TODO: make them configurable
index = "Index"
def _is_directory(self, repo_path):
"""Checks whether the path is a directory in the repository."""
if not repo_path:
return True
return repo_path in self._changectx().dirs()
def _title_to_file(self, title):
"""
Modified escaping allowing (some) slashes and spaces.
If the entry is a directory, use an index file.
"""
title = unicode(title).strip()
escaped = werkzeug.url_quote(title, safe='/ ')
escaped = self.periods_re.sub('%2E', escaped)
escaped = self.slashes_re.sub('%2F', escaped)
path = os.path.join(self.repo_prefix, escaped)
if self._is_directory(path):
path = os.path.join(path, self.index)
if page.page_mime(title) == 'text/x-wiki' and self.extension:
path += self.extension
return path
def _file_to_title(self, filepath):
"""If the path points to an index file, use the directory."""
if os.path.basename(filepath) == self.index:
filepath = os.path.dirname(filepath)
return super(WikiSubdirectoryStorage, self)._file_to_title(filepath)
def save_data(self, title, data, author=u'', comment=u'', parent_rev=None):
"""Save the file and make the subdirectories if needed."""
_ = self._
user = (author or _(u'anon')).encode('utf-8')
text = (comment or _(u'comment')).encode('utf-8')
repo_file = self._title_to_file(title)
files = [repo_file]
dir_path = None
new_dir_path = None
if os.path.basename(repo_file) != self.index:
# Move a colliding file out of the way.
dir_path = os.path.dirname(repo_file)
while dir_path:
if dir_path in self._changectx():
new_dir_path = os.path.join(dir_path, self.index)
files.extend([dir_path, new_dir_path])
dir_data = self._changectx()[dir_path].data()
break
dir_path = os.path.dirname(dir_path)
parent, other = self._get_parents(repo_file, parent_rev)
if data is None:
if title not in self:
raise error.NotFoundErr()
else:
if other is not None:
try:
data = self._merge(repo_file, parent, other, data)
except ValueError:
text = _(u'failed merge of edit conflict').encode('utf-8')
def filectxfn(repo, memctx, path):
if data is None or path == dir_path:
raise IOError()
if path == new_dir_path:
return mercurial.context.memfilectx(path, dir_data,
False, False, dir_path)
return mercurial.context.memfilectx(path, data, False, False, None)
ctx = mercurial.context.memctx(
repo=self.repo,
parents=(parent, other),
text=text,
files=files,
filectxfn=filectxfn,
user=user,
)
self.repo.commitctx(ctx)
self._tips = {}
def all_pages(self):
"""Iterate over the titles of all pages in the wiki."""
for repo_file in self._changectx():
if repo_file.startswith(self.repo_prefix):
title = self._file_to_title(repo_file)
if title in self:
yield title
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