fragalysis-target-access-authenticator-python-client

A simple Python 3 client to simplify access to the authenticator, providing the following functions: -

def get_auth_target_access(username: str) -> set[str]:
    [...]
def get_auth_users(target_access_string: str) -> TasAuthUsersGetResponse:
    [...]
def get_auth_version() -> TasAuthVersionGetResponse:
    [...]
def get_auth_ping() -> TasAuthPingGetResponse:
    [...]

get_auth_users() (which needs authenticator 1.5.0 or later) returns a response rather than a bare set because, unlike get_auth_target_access(), it has to distinguish "the TAS has no members" from "we could not find out": -

response = ta_auth_connector.get_auth_users("lb32627-66")
if response.error:
    # We do not know who the members are - 'users' is empty but meaningless
    ...
else:
    # 'users' is the membership, and may legitimately be empty
    ...

The module requires two items, extracted from the environment: -

• TA_AUTH_SERVICE - The service hostname. In cluster this might be http://auth.ta-authenticator.svc (an internal connection that is expected to comply with http:// protocol)
• TA_AUTH_QUERY_KEY - A 'secret' key the service expects in request headers.

Usage

After installing from PyPI, access the ta_auth_connector functions directly via the connector module: -

import ta_auth_connector

ping_response: TasAuthPingGetResponse = ta_auth_connector.get_auth_ping()

Target access strings

A Target Access String (TAS) is the concatenation of a two-character code (lower case), proposal number, and visit number formatted as <code><proposal>-<visit>: -

• lb12345-1
• lb32627-66

Rules

Access to non-public Fragalysis Targets is limited to users who are members of the associated TAS. If a target belongs to lb32627-66 (and lb32627-66 is not a publicly visible target) you will not be permitted access to the material unless, according to ISPyB, you are a member of proposal 32627 and visit 66.

Also, although everyone can view publicly visible targets you are not permitted to alter or add material to the target unless you are a member of the corresponding proposal and visit. Everyone can see public targets, but only members of the TAS can edit.

The authenticator service

See: -

• https://github.com/xchem/fragalysis-ispyb-target-access-authenticator
• https://github.com/xchem/fragalysis-mock-target-access-authenticator