web/views/staticcontrollers.py
author David Douard <david.douard@logilab.fr>
Thu, 19 Sep 2013 18:03:09 +0200
branchstable
changeset 9233 7d3316bfa4ff
parent 9229 739ae5366bed
child 9234 ce504d23edf7
permissions -rw-r--r--
[web] allow /data/ url again (closes #2464798) This feature was broken by 65fecbeb9c3a (which fixed another one itself).
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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Set of static resources controllers for :
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- /data/...
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- /static/...
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- /fckeditor/...
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"""
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import os
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import os.path as osp
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import hashlib
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import mimetypes
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import threading
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from time import mktime
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from datetime import datetime, timedelta
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from logging import getLogger
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from cubicweb import Unauthorized
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from cubicweb.web import NotFound
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from cubicweb.web.http_headers import generateDateTime
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from cubicweb.web.controller import Controller
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from cubicweb.web.views.urlrewrite import URLRewriter
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class StaticFileController(Controller):
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    """an abtract class to serve static file
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    Make sure to add your subclass to the STATIC_CONTROLLERS list"""
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    __abstract__ = True
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    directory_listing_allowed = False
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    def max_age(self, path):
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        """max cache TTL"""
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        return 60*60*24*7
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    def static_file(self, path):
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        """Return full content of a static file.
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        XXX iterable content would be better
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        """
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        debugmode = self._cw.vreg.config.debugmode
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        if osp.isdir(path):
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            if self.directory_listing_allowed:
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                return u''
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            raise Unauthorized(path)
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        if not osp.isfile(path):
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            raise NotFound()
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        if not debugmode:
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            # XXX: Don't provide additional resource information to error responses
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            #
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            # the HTTP RFC recommands not going further than 1 year ahead
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            expires = datetime.now() + timedelta(days=6*30)
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            self._cw.set_header('Expires', generateDateTime(mktime(expires.timetuple())))
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        # XXX system call to os.stats could be cached once and for all in
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        # production mode (where static files are not expected to change)
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        #
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        # Note that: we do a osp.isdir + osp.isfile before and a potential
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        # os.read after. Improving this specific call will not help
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        #
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        # Real production environment should use dedicated static file serving.
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        self._cw.set_header('last-modified', generateDateTime(os.stat(path).st_mtime))
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        if self._cw.is_client_cache_valid():
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            return ''
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        # XXX elif uri.startswith('/https/'): uri = uri[6:]
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        mimetype, encoding = mimetypes.guess_type(path)
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        if mimetype is None:
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            mimetype = 'application/octet-stream'
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        self._cw.set_content_type(mimetype, osp.basename(path), encoding)
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        with open(path, 'rb') as resource:
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            return resource.read()
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    @property
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    def relpath(self):
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        """path of a requested file relative to the controller"""
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        path = self._cw.form.get('static_relative_path')
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        if path is None:
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            path = self._cw.relative_path(includeparams=True)
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        return path
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class ConcatFilesHandler(object):
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    """Emulating the behavior of modconcat
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    this serve multiple file as a single one.
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    """
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   105
    def __init__(self, config):
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   106
        self._resources = {}
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   107
        self.config = config
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   108
        self.logger = getLogger('cubicweb.web')
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   109
        self.lock = threading.Lock()
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   110
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   111
    def _resource(self, path):
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   112
        """get the resouce"""
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   113
        try:
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   114
            return self._resources[path]
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   115
        except KeyError:
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   116
            self._resources[path] = self.config.locate_resource(path)
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   117
            return self._resources[path]
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   118
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   119
    def _up_to_date(self, filepath, paths):
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   120
        """
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   121
        The concat-file is considered up-to-date if it exists.
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   122
        In debug mode, an additional check is performed to make sure that
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   123
        concat-file is more recent than all concatenated files
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   124
        """
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   125
        if not osp.isfile(filepath):
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   126
            return False
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   127
        if self.config.debugmode:
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   128
            concat_lastmod = os.stat(filepath).st_mtime
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   129
            for path in paths:
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   130
                dirpath, rid = self._resource(path)
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   131
                if rid is None:
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   132
                    raise NotFound(path)
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   133
                path = osp.join(dirpath, rid)
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   134
                if os.stat(path).st_mtime > concat_lastmod:
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   135
                    return False
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   136
        return True
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   137
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   138
    def build_filepath(self, paths):
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   139
        """return the filepath that will be used to cache concatenation of `paths`
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   140
        """
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   141
        _, ext = osp.splitext(paths[0])
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   142
        fname = 'cache_concat_' + hashlib.md5(';'.join(paths)).hexdigest() + ext
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   143
        return osp.join(self.config.appdatahome, 'uicache', fname)
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   144
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   145
    def concat_cached_filepath(self, paths):
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diff changeset
   146
        filepath = self.build_filepath(paths)
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   147
        if not self._up_to_date(filepath, paths):
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   148
            tmpfile = filepath + '.tmp'
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   149
            try:
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   150
                with self.lock:
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diff changeset
   151
                    if self._up_to_date(filepath, paths):
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   152
                        # first check could have raced with some other thread
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diff changeset
   153
                        # updating the file
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   154
                        return filepath
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   155
                    with open(tmpfile, 'wb') as f:
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   156
                        for path in paths:
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   157
                            dirpath, rid = self._resource(path)
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   158
                            if rid is None:
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diff changeset
   159
                                # In production mode log an error, do not return a 404
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   160
                                # XXX the erroneous content is cached anyway
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diff changeset
   161
                                self.logger.error('concatenated data url error: %r file '
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   162
                                                  'does not exist', path)
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diff changeset
   163
                                if self.config.debugmode:
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   164
                                    raise NotFound(path)
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   165
                            else:
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diff changeset
   166
                                with open(osp.join(dirpath, rid), 'rb') as source:
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diff changeset
   167
                                    for line in source:
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diff changeset
   168
                                        f.write(line)
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diff changeset
   169
                                f.write('\n')
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   170
                    os.rename(tmpfile, filepath)
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diff changeset
   171
            except:
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diff changeset
   172
                os.remove(tmpfile)
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   173
                raise
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   174
        return filepath
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diff changeset
   175
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diff changeset
   176
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   177
class DataController(StaticFileController):
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   178
    """Controller in charge of serving static file in /data/
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   179
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   180
    Handle modeconcat like url.
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   181
    """
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   182
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   183
    __regid__ = 'data'
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   184
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   185
    def __init__(self, *args, **kwargs):
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   186
        super(DataController, self).__init__(*args, **kwargs)
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   187
        config = self._cw.vreg.config
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   188
        md5_version = config.instance_md5_version()
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   189
        self.base_datapath = config.data_relpath()
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   190
        self.data_modconcat_basepath = '%s??' % self.base_datapath
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   191
        self.concat_files_registry = ConcatFilesHandler(config)
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diff changeset
   192
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   193
    def publish(self, rset=None):
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diff changeset
   194
        config = self._cw.vreg.config
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diff changeset
   195
        # includeparams=True for modconcat-like urls
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   196
        relpath = self.relpath
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diff changeset
   197
        if relpath.startswith(self.data_modconcat_basepath):
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diff changeset
   198
            paths = relpath[len(self.data_modconcat_basepath):].split(',')
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   199
            filepath = self.concat_files_registry.concat_cached_filepath(paths)
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   200
        else:
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   201
            # skip leading '/data/' and url params
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diff changeset
   202
            if relpath.startswith(self.base_datapath):
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diff changeset
   203
                prefix = self.base_datapath
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diff changeset
   204
            else:
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diff changeset
   205
                prefix = 'data/'
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diff changeset
   206
            relpath = relpath[len(prefix):]
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diff changeset
   207
            relpath = relpath.split('?', 1)[0]
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diff changeset
   208
            dirpath, rid = config.locate_resource(relpath)
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diff changeset
   209
            if dirpath is None:
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diff changeset
   210
                raise NotFound()
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            filepath = osp.join(dirpath, rid)
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        return self.static_file(filepath)
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class FCKEditorController(StaticFileController):
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    """Controller in charge of serving FCKEditor related file
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    The motivational for a dedicated controller have been lost.
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    """
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    __regid__ = 'fckeditor'
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    def publish(self, rset=None):
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        config = self._cw.vreg.config
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        if self._cw.https:
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            uiprops = config.https_uiprops
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        else:
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            uiprops = config.uiprops
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        relpath = self.relpath
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        if relpath.startswith('fckeditor/'):
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            relpath = relpath[len('fckeditor/'):]
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        relpath = relpath.split('?', 1)[0]
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        return self.static_file(osp.join(uiprops['FCKEDITOR_PATH'], relpath))
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class StaticDirectoryController(StaticFileController):
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    """Controller in charge of serving static file in /static/
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    """
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    __regid__ = 'static'
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    def publish(self, rset=None):
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        staticdir = self._cw.vreg.config.static_directory
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        relpath = self.relpath
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        return self.static_file(osp.join(staticdir, relpath))
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STATIC_CONTROLLERS = [DataController, FCKEditorController,
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                      StaticDirectoryController]
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class StaticControlerRewriter(URLRewriter):
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    """a quick and dirty rewritter in charge of server static file.
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    This is a work around the flatness of url handling in cubicweb."""
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    __regid__ = 'static'
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    priority = 10
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    def rewrite(self, req, uri):
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        for ctrl in STATIC_CONTROLLERS:
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            if uri.startswith('/%s/' % ctrl.__regid__):
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                break
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        else:
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            self.debug("not a static file uri: %s", uri)
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            raise KeyError(uri)
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        relpath = self._cw.relative_path(includeparams=False)
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        self._cw.form['static_relative_path'] = self._cw.relative_path(includeparams=True)
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        return ctrl.__regid__, None