1 # Copyright 2013 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
9 from compiled_file_system import SingleFile
10 from directory_zipper import DirectoryZipper
11 from docs_server_utils import ToUnicode
12 from file_system import FileNotFoundError
13 from future import All, Future
14 from path_canonicalizer import PathCanonicalizer
15 from path_util import AssertIsValid, IsDirectory, Join, ToDirectory
16 from special_paths import SITE_VERIFICATION_FILE
17 from third_party.markdown import markdown
18 from third_party.motemplate import Motemplate
21 _MIMETYPE_OVERRIDES = {
22 # SVG is not supported by mimetypes.guess_type on AppEngine.
23 '.svg': 'image/svg+xml',
27 class ContentAndType(object):
28 '''Return value from ContentProvider.GetContentAndType.
31 def __init__(self, content, content_type, version):
32 self.content = content
33 self.content_type = content_type
34 self.version = version
37 class ContentProvider(object):
38 '''Returns file contents correctly typed for their content-types (in the HTTP
39 sense). Content-type is determined from Python's mimetype library which
40 guesses based on the file extension.
42 Typically the file contents will be either str (for binary content) or
43 unicode (for text content). However, HTML files *may* be returned as
44 Motemplate templates (if |supports_templates| is True on construction), in
45 which case the caller will presumably want to Render them.
47 Zip file are automatically created and returned for .zip file extensions if
48 |supports_zip| is True.
50 |default_extensions| is a list of file extensions which are queried when no
51 file extension is given to GetCanonicalPath/GetContentAndType. Typically
52 this will include .html.
60 default_extensions=(),
61 supports_templates=False,
65 self.file_system = file_system
67 self._content_cache = compiled_fs_factory.Create(file_system,
70 self._path_canonicalizer = PathCanonicalizer(file_system,
73 self._default_extensions = default_extensions
74 self._supports_templates = supports_templates
76 self._directory_zipper = DirectoryZipper(compiled_fs_factory, file_system)
78 self._directory_zipper = None
81 def _CompileContent(self, path, text):
82 assert text is not None, path
83 _, ext = posixpath.splitext(path)
84 mimetype = _MIMETYPE_OVERRIDES.get(ext, mimetypes.guess_type(path)[0])
86 # See http://pythonhosted.org/Markdown/extensions
87 # for details on "extensions=".
88 content = markdown(ToUnicode(text),
89 extensions=('extra', 'headerid', 'sane_lists'))
90 if self._supports_templates:
91 content = Motemplate(content, name=path)
92 mimetype = 'text/html'
93 elif mimetype is None:
95 mimetype = 'text/plain'
96 elif mimetype == 'text/html':
97 content = ToUnicode(text)
98 if self._supports_templates:
99 content = Motemplate(content, name=path)
100 elif (mimetype.startswith('text/') or
101 mimetype in ('application/javascript', 'application/json')):
102 content = ToUnicode(text)
105 return ContentAndType(content,
107 self.file_system.Stat(path).version)
109 def GetCanonicalPath(self, path):
110 '''Gets the canonical location of |path|. This class is tolerant of
111 spelling errors and missing files that are in other directories, and this
112 returns the correct/canonical path for those.
114 For example, the canonical path of "browseraction" is probably
115 "extensions/browserAction.html".
117 Note that the canonical path is relative to this content provider i.e.
118 given relative to |path|. It does not add the "serveFrom" prefix which
119 would have been pulled out in ContentProviders, callers must do that
123 base, ext = posixpath.splitext(path)
124 if self._directory_zipper and ext == '.zip':
125 # The canonical location of zip files is the canonical location of the
126 # directory to zip + '.zip'.
127 return self._path_canonicalizer.Canonicalize(base + '/').rstrip('/') + ext
128 return self._path_canonicalizer.Canonicalize(path)
130 def GetContentAndType(self, path):
131 '''Returns a Future to the ContentAndType of the file at |path|.
134 base, ext = posixpath.splitext(path)
135 if self._directory_zipper and ext == '.zip':
136 return (self._directory_zipper.Zip(ToDirectory(base))
137 .Then(lambda zipped: ContentAndType(zipped,
140 return self._FindFileForPath(path).Then(self._content_cache.GetFromFile)
142 def GetVersion(self, path):
143 '''Returns a Future to the version of the file at |path|.
146 base, ext = posixpath.splitext(path)
147 if self._directory_zipper and ext == '.zip':
148 stat_future = self.file_system.StatAsync(ToDirectory(base))
150 stat_future = self._FindFileForPath(path).Then(self.file_system.StatAsync)
151 return stat_future.Then(lambda stat: stat.version)
153 def _FindFileForPath(self, path):
154 '''Finds the real file backing |path|. This may require looking for the
155 correct file extension, or looking for an 'index' file if it's a directory.
156 Returns None if no path is found.
159 _, ext = posixpath.splitext(path)
162 # There was already an extension, trust that it's a path. Elsewhere
163 # up the stack this will be caught if it's not.
164 return Future(value=path)
166 def find_file_with_name(name):
167 '''Tries to find a file in the file system called |name| with one of the
168 default extensions of this content provider.
169 If none is found, returns None.
171 paths = [name + ext for ext in self._default_extensions]
172 def get_first_path_which_exists(existence):
173 for exists, path in zip(existence, paths):
177 return (All(self.file_system.Exists(path) for path in paths)
178 .Then(get_first_path_which_exists))
180 def find_index_file():
181 '''Tries to find an index file in |path|, if |path| is a directory.
182 If not, or if there is no index file, returns None.
184 def get_index_if_directory_exists(directory_exists):
185 if not directory_exists:
187 return find_file_with_name(Join(path, 'index'))
188 return (self.file_system.Exists(ToDirectory(path))
189 .Then(get_index_if_directory_exists))
191 # Try to find a file with the right name. If not, and it's a directory,
192 # look for an index file in that directory. If nothing at all is found,
193 # return the original |path| - its nonexistence will be caught up the stack.
194 return (find_file_with_name(path)
195 .Then(lambda found: found or find_index_file())
196 .Then(lambda found: found or path))
199 futures = [self._path_canonicalizer.Refresh()]
200 for root, _, files in self.file_system.Walk(''):
202 futures.append(self.GetContentAndType(Join(root, f)))
203 # Also cache the extension-less version of the file if needed.
204 base, ext = posixpath.splitext(f)
205 if f != SITE_VERIFICATION_FILE and ext in self._default_extensions:
206 futures.append(self.GetContentAndType(Join(root, base)))
207 # TODO(kalman): Cache .zip files for each directory (if supported).
208 return All(futures, except_pass=Exception, except_pass_log=True)
211 return 'ContentProvider of <%s>' % repr(self.file_system)