def check_public_commands(self, command):
''' check and execute commands,
which are available without authorization
'''
if command == 'link':
# get file from link code
code = self.request.path_info_pop()
link = ShareLink.gql('WHERE link = :1', code).get()
if link == None:
# link not found
self.error(404)
return True
status, metadata = self.backend.get_metadata(link.path, link.data.credentials)
type = mimetypes.guess_type(metadata['path'])
if type[0]:
self.response.headers['Content-Type'] = type[0]
# check if file is modified
if status == 200:
if self.request.headers.get('If-None-Match', '') == metadata['version']:
status = 304
else:
# output file content
status = self.backend.get_file(self.response.out, link.path, link.data.credentials)
self.response.headers.add_header("ETag", metadata['version'])
self.response.set_status(status)
return True
if command == 'extensions':
# return list of supported extensions
query = self.request.get('name',None)
extensions = self.backend.get_extensions()
if query:
# if query parameter is supplied,
# then check only queried extension
if query in extensions:
self.response.out.write('True')
else:
self.response.out.write('False')
else:
json.dump(extensions, self.response.out)
return True
return False
def get(self, command, service=None):
''' process GET request
'''
if service == None:
# select service adapter
self.service, self.backend = self.detect_service()
command = self.request.path_info_pop()
# not all commands need authorization
if self.check_public_commands(command):
return
# Check authorization
user_auth = auth.valid_token(self.request)
if user_auth == None:
self.send_unauthorized()
return
if command == 'files':
# pass whole file to user
creds_key = user_auth.owner + "_" + self.service
creds = ServiceData.get_by_key_name(creds_key)
if creds == None:
self.send_unauthorized('no authorization data for service '+self.service)
else:
if self.request.get('version'):
params = {'version' : self.request.get('version')}
else:
params = None
path = self.request.path_info
status = self.backend.get_file(self.response.out, path, creds.credentials, params)
self.response.set_status(status)
return
if command == 'metadata':
# return metadata
creds_key = user_auth.owner + "_" + self.service
creds = ServiceData.get_by_key_name(creds_key)
if creds == None:
self.send_unauthorized('no authorization data for service '+self.service)
else:
if self.request.get('list'):
params = {'list' : True if self.request.get('list') == 'true' else False }
else:
params = None
path = self.request.path_info
status, metadata = self.backend.get_metadata(path, creds.credentials, params)
# output json
json.dump(metadata, self.response.out, ensure_ascii=False)
self.response.set_status(status)
return
if command == 'addshare':
# create public link to file
creds_key = user_auth.owner + "_" + self.service
creds = ServiceData.get_by_key_name(creds_key)
if creds == None:
self.send_unauthorized('no authorization data for service '+self.service)
else:
path = self.request.path_info
link_key = creds_key + path
link = ShareLink.get_or_insert(link_key, data=creds, path=path)
link.regenerate_link() # generate link code
self.response.out.write(link.link)
return
if command == 'share':
# return list of shares
# get credentials
creds_key = user_auth.owner + "_" + self.service
creds = ServiceData.get_by_key_name(creds_key)
if creds == None:
self.send_unauthorized('no authorization data for service '+self.service)
else:
links = ShareLink.gql('WHERE data = :1', creds)
link_list = [(link.path, link.link) for link in links]
# return json
json.dump(link_list, self.response.out, ensure_ascii=False)
return
if command == 'unshare':
# delete public link to file
# get credentials
creds_key = user_auth.owner + "_" + self.service
creds = ServiceData.get_by_key_name(creds_key)
if creds == None:
self.send_unauthorized('no authorization data for service '+self.service)
else:
path = self.request.path_info
link_key = creds_key + path
link = ShareLink.get_by_key_name(link_key)
if link == None:
self.error(404)
else:
link.delete()
return
# if we got down here then command is not recognized
# report error
self.error(400)
self.response.headers.add_header("Cache-Control", "no-store")
self.response.out.write("Unsupported command")