Leave commented-out stable url code for reference, with TODO.

IPython/frontend/html/notebook/notebookmanager.py

@@ -1,218 +1,228 b''
 """A notebook manager that uses the local file system for storage.
 
 Authors:
 
 * Brian Granger
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import datetime
 import os
 import uuid
 import glob
 
 from tornado import web
 
 from IPython.config.configurable import LoggingConfigurable
 from IPython.nbformat import current
 from IPython.utils.traitlets import Unicode, List, Dict
 
 
 #-----------------------------------------------------------------------------
 # Code
 #-----------------------------------------------------------------------------
 
 
 class NotebookManager(LoggingConfigurable):
 
     notebook_dir = Unicode(os.getcwd(), config=True, help="""
         The directory to use for notebooks.
     """)
     filename_ext = Unicode(u'.ipynb')
     allowed_formats = List([u'json',u'py'])
 
     # Map notebook_ids to notebook names
     mapping = Dict()
     # Map notebook names to notebook_ids
     rev_mapping = Dict()
 
     def list_notebooks(self):
         """List all notebooks in the notebook dir.
 
         This returns a list of dicts of the form::
 
             dict(notebook_id=notebook,name=name)
         """
         names = glob.glob(os.path.join(self.notebook_dir,
                                        '*' + self.filename_ext))
         names = [os.path.splitext(os.path.basename(name))[0]
                  for name in names]
 
         data = []
         for name in names:
             if name not in self.rev_mapping:
                 notebook_id = self.new_notebook_id(name)
             else:
                 notebook_id = self.rev_mapping[name]
             data.append(dict(notebook_id=notebook_id,name=name))
         data = sorted(data, key=lambda item: item['name'])
         return data
 
     def new_notebook_id(self, name):
         """Generate a new notebook_id for a name and store its mappings."""
+        # TODO: the following will give stable urls for notebooks, but unless
+        # the notebooks are immediately redirected to their new urls when their
+        # filemname changes, nasty inconsistencies result.  So for now it's
+        # disabled and instead we use a random uuid4() call.  But we leave the
+        # logic here so that we can later reactivate it, whhen the necessary
+        # url redirection code is written.
+        #notebook_id = unicode(uuid.uuid5(uuid.NAMESPACE_URL,
+        #                 'file://'+self.get_path_by_name(name).encode('utf-8')))
+        
         notebook_id = unicode(uuid.uuid4())
+        
         self.mapping[notebook_id] = name
         self.rev_mapping[name] = notebook_id
         return notebook_id
 
     def delete_notebook_id(self, notebook_id):
         """Delete a notebook's id only. This doesn't delete the actual notebook."""
         name = self.mapping[notebook_id]
         del self.mapping[notebook_id]
         del self.rev_mapping[name]
 
     def notebook_exists(self, notebook_id):
         """Does a notebook exist?"""
         if notebook_id not in self.mapping:
             return False
         path = self.get_path_by_name(self.mapping[notebook_id])
         return os.path.isfile(path)
 
     def find_path(self, notebook_id):
         """Return a full path to a notebook given its notebook_id."""
         try:
             name = self.mapping[notebook_id]
         except KeyError:
             raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
         return self.get_path_by_name(name)
 
     def get_path_by_name(self, name):
         """Return a full path to a notebook given its name."""
         filename = name + self.filename_ext
         path = os.path.join(self.notebook_dir, filename)
         return path       
 
     def get_notebook(self, notebook_id, format=u'json'):
         """Get the representation of a notebook in format by notebook_id."""
         format = unicode(format)
         if format not in self.allowed_formats:
             raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
         last_modified, nb = self.get_notebook_object(notebook_id)
         data = current.writes(nb, format)
         name = nb.get('name','notebook')
         return last_modified, name, data
 
     def get_notebook_object(self, notebook_id):
         """Get the NotebookNode representation of a notebook by notebook_id."""
         path = self.find_path(notebook_id)
         if not os.path.isfile(path):
             raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
         info = os.stat(path)
         last_modified = datetime.datetime.utcfromtimestamp(info.st_mtime)
         with open(path,'r') as f:
             s = f.read()
             try:
                 # v1 and v2 and json in the .ipynb files.
                 nb = current.reads(s, u'json')
             except:
                 raise web.HTTPError(500, u'Unreadable JSON notebook.')
         if 'name' not in nb:
             nb.name = os.path.split(path)[-1].split(u'.')[0]
         return last_modified, nb
 
     def save_new_notebook(self, data, name=None, format=u'json'):
         """Save a new notebook and return its notebook_id.
 
         If a name is passed in, it overrides any values in the notebook data
         and the value in the data is updated to use that value.
         """
         if format not in self.allowed_formats:
             raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
 
         try:
             nb = current.reads(data, format)
         except:
             raise web.HTTPError(400, u'Invalid JSON data')
 
         if name is None:
             try:
                 name = nb.metadata.name
             except AttributeError:
                 raise web.HTTPError(400, u'Missing notebook name')
         nb.metadata.name = name
 
         notebook_id = self.new_notebook_id(name)
         self.save_notebook_object(notebook_id, nb)
         return notebook_id
 
     def save_notebook(self, notebook_id, data, name=None, format=u'json'):
         """Save an existing notebook by notebook_id."""
         if format not in self.allowed_formats:
             raise web.HTTPError(415, u'Invalid notebook format: %s' % format)
 
         try:
             nb = current.reads(data, format)
         except:
             raise web.HTTPError(400, u'Invalid JSON data')
 
         if name is not None:
             nb.metadata.name = name
         self.save_notebook_object(notebook_id, nb)
 
     def save_notebook_object(self, notebook_id, nb):
         """Save an existing notebook object by notebook_id."""
         if notebook_id not in self.mapping:
             raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
         old_name = self.mapping[notebook_id]
         try:
             new_name = nb.metadata.name
         except AttributeError:
             raise web.HTTPError(400, u'Missing notebook name')
         path = self.get_path_by_name(new_name)
         try:
             with open(path,'w') as f:
                 current.write(nb, f, u'json')
         except:
             raise web.HTTPError(400, u'Unexpected error while saving notebook')
         if old_name != new_name:
             old_path = self.get_path_by_name(old_name)
             if os.path.isfile(old_path):
                 os.unlink(old_path)
             self.mapping[notebook_id] = new_name
             self.rev_mapping[new_name] = notebook_id
 
     def delete_notebook(self, notebook_id):
         """Delete notebook by notebook_id."""
         path = self.find_path(notebook_id)
         if not os.path.isfile(path):
             raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
         os.unlink(path)
         self.delete_notebook_id(notebook_id)
 
     def new_notebook(self):
         """Create a new notebook and returns its notebook_id."""
         i = 0
         while True:
             name = u'Untitled%i' % i
             path = self.get_path_by_name(name)
             if not os.path.isfile(path):
                 break
             else:
                 i = i+1
         notebook_id = self.new_notebook_id(name)
         metadata = current.new_metadata(name=name)
         nb = current.new_notebook(metadata=metadata)
         with open(path,'w') as f:
             current.write(nb, f, u'json')
         return notebook_id