Globus Identity Mapper

The Globus Identity Mapper Python library provides two mapping classes that implement configurable hooks for mapping a Globus Auth Identity resource to an application- or context-specific username:

• ExpressionIdentityMapping
• ExternalIdentityMapping

Additionally, the library offers a protocol for implementing custom identity mapper logic:

• IdentityMappingProtocol

Most consumers of this library will make use of a mapping configuration document, the .from_mapping_document() method to instantiate the appropriate class, and then call .map_identity() or .map_identities() thereafter. This enables administrators to dynamically specify their desired mapping configuration without having to resort to typing Python code. For example, a simple mapping configuration to use the ExpressionIdentityMapping logic to follow the rules as documented at Globus Connect Server, Identity Mapping might be:

{
  "DATA_TYPE": "expression_identity_mapping#1.0.0",
  "mappings": [
    {
      "source": "{email}", "match": "(.*)@example\\.org", "output": "{0}"
    }
  ]
}

A hard-coded class instantiation might look like:

>>> import json
>>> from globus_identity_mapping import ExpressionIdentityMapping
>>> fdata = open("example_configuration.json").read()
>>> mapping_document = json.loads(fdata)
>>> connector_id = "..."  # see the Identity Mapping Guide, linked above
>>> storage_gateway = "application-specific-identifier"
>>> mapper = ExpressionIdentityMapping.from_mapping_document(
...   mapping_document, storage_gateway=storage_gateway, connector_id=connector_id
... )

Thereafter, the mapper may be used to find a context-aware username by mapping the source field of email from a Globus Auth Identity record via the regular expression logic. (In the above example, the hostname is stripped to determine the application-specific username.) Example:

>>> gair = {"id": "...", "sub": "...", "email": "billy@example.org", "name": "..."}
>>> mapper.map_identity(gair)
'billy'

For more serious library usage, implements may want to look at globus_identity_mapping.loader.load_mappers

Development

The high level bits:

• uses Poetry (pyproject.toml)
• uses tox
  • tox - enough to run all tests
  • tox -e mypy to run mypy
• Reminder to install pre-commit at your first checkout: pre-commit --install