"""Tornado handlers for the contents web service.""" # Copyright (c) IPython Development Team. # Distributed under the terms of the Modified BSD License. import json from tornado import gen, web from IPython.html.utils import url_path_join, url_escape from IPython.utils.jsonutil import date_default from IPython.html.base.handlers import ( IPythonHandler, json_errors, path_regex, ) def sort_key(model): """key function for case-insensitive sort by name and type""" iname = model['name'].lower() type_key = { 'directory' : '0', 'notebook' : '1', 'file' : '2', }.get(model['type'], '9') return u'%s%s' % (type_key, iname) def validate_model(model, expect_content): """ Validate a model returned by a ContentsManager method. If expect_content is True, then we expect non-null entries for 'content' and 'format'. """ required_keys = { "name", "path", "type", "writable", "created", "last_modified", "mimetype", "content", "format", } missing = required_keys - set(model.keys()) if missing: raise web.HTTPError( 500, u"Missing Model Keys: {missing}".format(missing=missing), ) maybe_none_keys = ['content', 'format'] if model['type'] == 'file': # mimetype should be populated only for file models maybe_none_keys.append('mimetype') if expect_content: errors = [key for key in maybe_none_keys if model[key] is None] if errors: raise web.HTTPError( 500, u"Keys unexpectedly None: {keys}".format(keys=errors), ) else: errors = { key: model[key] for key in maybe_none_keys if model[key] is not None } if errors: raise web.HTTPError( 500, u"Keys unexpectedly not None: {keys}".format(keys=errors), ) class ContentsHandler(IPythonHandler): SUPPORTED_METHODS = (u'GET', u'PUT', u'PATCH', u'POST', u'DELETE') def location_url(self, path): """Return the full URL location of a file. Parameters ---------- path : unicode The API path of the file, such as "foo/bar.txt". """ return url_escape(url_path_join( self.base_url, 'api', 'contents', path )) def _finish_model(self, model, location=True): """Finish a JSON request with a model, setting relevant headers, etc.""" if location: location = self.location_url(model['path']) self.set_header('Location', location) self.set_header('Last-Modified', model['last_modified']) self.set_header('Content-Type', 'application/json') self.finish(json.dumps(model, default=date_default)) @web.authenticated @json_errors @gen.coroutine def get(self, path=''): """Return a model for a file or directory. A directory model contains a list of models (without content) of the files and directories it contains. """ path = path or '' type = self.get_query_argument('type', default=None) if type not in {None, 'directory', 'file', 'notebook'}: raise web.HTTPError(400, u'Type %r is invalid' % type) format = self.get_query_argument('format', default=None) if format not in {None, 'text', 'base64'}: raise web.HTTPError(400, u'Format %r is invalid' % format) content = self.get_query_argument('content', default='1') if content not in {'0', '1'}: raise web.HTTPError(400, u'Content %r is invalid' % content) content = int(content) model = yield gen.maybe_future(self.contents_manager.get( path=path, type=type, format=format, content=content, )) if model['type'] == 'directory' and content: # group listing by type, then by name (case-insensitive) # FIXME: sorting should be done in the frontends model['content'].sort(key=sort_key) validate_model(model, expect_content=content) self._finish_model(model, location=False) @web.authenticated @json_errors @gen.coroutine def patch(self, path=''): """PATCH renames a file or directory without re-uploading content.""" cm = self.contents_manager model = self.get_json_body() if model is None: raise web.HTTPError(400, u'JSON body missing') model = yield gen.maybe_future(cm.update(model, path)) validate_model(model, expect_content=False) self._finish_model(model) @gen.coroutine def _copy(self, copy_from, copy_to=None): """Copy a file, optionally specifying a target directory.""" self.log.info(u"Copying {copy_from} to {copy_to}".format( copy_from=copy_from, copy_to=copy_to or '', )) model = yield gen.maybe_future(self.contents_manager.copy(copy_from, copy_to)) self.set_status(201) validate_model(model, expect_content=False) self._finish_model(model) @gen.coroutine def _upload(self, model, path): """Handle upload of a new file to path""" self.log.info(u"Uploading file to %s", path) model = yield gen.maybe_future(self.contents_manager.new(model, path)) self.set_status(201) validate_model(model, expect_content=False) self._finish_model(model) @gen.coroutine def _new_untitled(self, path, type='', ext=''): """Create a new, empty untitled entity""" self.log.info(u"Creating new %s in %s", type or 'file', path) model = yield gen.maybe_future(self.contents_manager.new_untitled(path=path, type=type, ext=ext)) self.set_status(201) validate_model(model, expect_content=False) self._finish_model(model) @gen.coroutine def _save(self, model, path): """Save an existing file.""" self.log.info(u"Saving file at %s", path) model = yield gen.maybe_future(self.contents_manager.save(model, path)) validate_model(model, expect_content=False) self._finish_model(model) @web.authenticated @json_errors @gen.coroutine def post(self, path=''): """Create a new file in the specified path. POST creates new files. The server always decides on the name. POST /api/contents/path New untitled, empty file or directory. POST /api/contents/path with body {"copy_from" : "/path/to/OtherNotebook.ipynb"} New copy of OtherNotebook in path """ cm = self.contents_manager if cm.file_exists(path): raise web.HTTPError(400, "Cannot POST to files, use PUT instead.") if not cm.dir_exists(path): raise web.HTTPError(404, "No such directory: %s" % path) model = self.get_json_body() if model is not None: copy_from = model.get('copy_from') ext = model.get('ext', '') type = model.get('type', '') if copy_from: yield self._copy(copy_from, path) else: yield self._new_untitled(path, type=type, ext=ext) else: yield self._new_untitled(path) @web.authenticated @json_errors @gen.coroutine def put(self, path=''): """Saves the file in the location specified by name and path. PUT is very similar to POST, but the requester specifies the name, whereas with POST, the server picks the name. PUT /api/contents/path/Name.ipynb Save notebook at ``path/Name.ipynb``. Notebook structure is specified in `content` key of JSON request body. If content is not specified, create a new empty notebook. """ model = self.get_json_body() if model: if model.get('copy_from'): raise web.HTTPError(400, "Cannot copy with PUT, only POST") exists = yield gen.maybe_future(self.contents_manager.file_exists(path)) if exists: yield gen.maybe_future(self._save(model, path)) else: yield gen.maybe_future(self._upload(model, path)) else: yield gen.maybe_future(self._new_untitled(path)) @web.authenticated @json_errors @gen.coroutine def delete(self, path=''): """delete a file in the given path""" cm = self.contents_manager self.log.warn('delete %s', path) yield gen.maybe_future(cm.delete(path)) self.set_status(204) self.finish() class CheckpointsHandler(IPythonHandler): SUPPORTED_METHODS = ('GET', 'POST') @web.authenticated @json_errors @gen.coroutine def get(self, path=''): """get lists checkpoints for a file""" cm = self.contents_manager checkpoints = yield gen.maybe_future(cm.list_checkpoints(path)) data = json.dumps(checkpoints, default=date_default) self.finish(data) @web.authenticated @json_errors @gen.coroutine def post(self, path=''): """post creates a new checkpoint""" cm = self.contents_manager checkpoint = yield gen.maybe_future(cm.create_checkpoint(path)) data = json.dumps(checkpoint, default=date_default) location = url_path_join(self.base_url, 'api/contents', path, 'checkpoints', checkpoint['id']) self.set_header('Location', url_escape(location)) self.set_status(201) self.finish(data) class ModifyCheckpointsHandler(IPythonHandler): SUPPORTED_METHODS = ('POST', 'DELETE') @web.authenticated @json_errors @gen.coroutine def post(self, path, checkpoint_id): """post restores a file from a checkpoint""" cm = self.contents_manager yield gen.maybe_future(cm.restore_checkpoint(checkpoint_id, path)) self.set_status(204) self.finish() @web.authenticated @json_errors @gen.coroutine def delete(self, path, checkpoint_id): """delete clears a checkpoint for a given file""" cm = self.contents_manager yield gen.maybe_future(cm.delete_checkpoint(checkpoint_id, path)) self.set_status(204) self.finish() class NotebooksRedirectHandler(IPythonHandler): """Redirect /api/notebooks to /api/contents""" SUPPORTED_METHODS = ('GET', 'PUT', 'PATCH', 'POST', 'DELETE') def get(self, path): self.log.warn("/api/notebooks is deprecated, use /api/contents") self.redirect(url_path_join( self.base_url, 'api/contents', path )) put = patch = post = delete = get #----------------------------------------------------------------------------- # URL to handler mappings #----------------------------------------------------------------------------- _checkpoint_id_regex = r"(?P[\w-]+)" default_handlers = [ (r"/api/contents%s/checkpoints" % path_regex, CheckpointsHandler), (r"/api/contents%s/checkpoints/%s" % (path_regex, _checkpoint_id_regex), ModifyCheckpointsHandler), (r"/api/contents%s" % path_regex, ContentsHandler), (r"/api/notebooks/?(.*)", NotebooksRedirectHandler), ]