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bokeh.server.util

Provide some utility functions useful for implementing different components in bokeh.server.

bind_sockets(address, port)[source]

Bind a socket to a port on an address.

Parameters:
  • address (str) – An address to bind a port on, e.g. "localhost"
  • port (int) –

    A port number to bind.

    Pass 0 to have the OS automatically choose a free port.

This function returns a 2-tuple with the new socket as the first element, and the port that was bound as the second. (Useful when passing 0 as a port number to bind any free port.)

Returns:(socket, port)
check_whitelist(host, whitelist)[source]

Check a given request host against a whitelist.

Parameters:
  • host (str) –

    A host string to compare against a whitelist.

    If the host does not specify a port, then ":80" is implicitly assumed.

  • whitelist (seq[str]) – A list of host patterns to match against
Returns:

True, if host matches any pattern in whitelist, otherwise False
create_hosts_whitelist(host_list, port)[source]

This whitelist can be used to restrict websocket or other connections to only those explicitly originating from approved hosts.

Parameters:
  • host_list (seq[str]) –

    A list of string <name> or <name>:<port> values to add to the whitelist.

    If no port is specified in a host string, then ":80" is implicitly assumed.

  • port (int) –

    If host_list is empty or None, then the whitelist will be the single item list `` [ ‘localhost:<port>’ ]``

    If host_list is not empty, this parameter has no effect.
Returns:

list[str]
Raises:

ValueError, if host or port values are invalid

Note

If any host in host_list contains a wildcard * a warning will be logged regarding permissive websocket connections.

match_host(host, pattern)[source]

Match a host string against a pattern

Parameters:
  • host (str) – A hostname to compare to the given pattern
  • pattern (str) – A string representing a hostname pattern, possibly including wildcards for ip address octets or ports.

This function will return True if the hostname matches the pattern, including any widcards. If the pattern contains a port, the host string must also contain a matching port.

Returns:bool

Examples

>>> match_host('192.168.0.1:80', '192.168.0.1:80')
True
>>> match_host('192.168.0.1:80', '192.168.0.1')
True
>>> match_host('192.168.0.1:80', '192.168.0.1:8080')
False
>>> match_host('192.168.0.1', '192.168.0.2')
False
>>> match_host('192.168.0.1', '192.168.*.*')
True
>>> match_host('alice', 'alice')
True
>>> match_host('alice:80', 'alice')
True
>>> match_host('alice', 'bob')
False
>>> match_host('foo.example.com', 'foo.example.com.net')
False
>>> match_host('alice', '*')
True
>>> match_host('alice', '*:*')
True
>>> match_host('alice:80', '*')
True
>>> match_host('alice:80', '*:80')
True
>>> match_host('alice:8080', '*:80')
False