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signposting

Parse and navigate FAIR Signposting Link headers

    0.9.6

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===============================
Signposting link parser library
===============================
*Finding signposting in FAIR resources*

.. image:: https://img.shields.io/pypi/v/signposting
    :target: https://pypi.org/project/signposting/
    :alt: pypi install signposting

.. image:: https://img.shields.io/pypi/pyversions/signposting
    :target: https://pypi.org/project/signposting/
    :alt: Python

.. image:: https://img.shields.io/github/license/stain/signposting
    :target: https://www.apache.org/licenses/LICENSE-2.0
    :alt: Apache License v.2.0

.. image:: https://github.com/stain/signposting/workflows/Tests/badge.svg?branch=main
    :target: https://github.com/stain/signposting/actions?workflow=Tests
    :alt: Test Status

.. image:: https://github.com/stain/signposting/workflows/Package%20Build/badge.svg?branch=main
    :target: https://github.com/stain/signposting/actions?workflow=Package%20Build
    :alt: Package Build

.. image:: https://codecov.io/gh/stain/signposting/branch/main/graph/badge.svg
    :target: https://codecov.io/gh/stain/signposting
    :alt: Codecov

.. image:: https://img.shields.io/readthedocs/signposting/latest?label=Read%20the%20Docs
    :target: https://signposting.readthedocs.io/en/latest/index.html
    :alt: Read the Docs

.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.6815412.svg
   :target: https://doi.org/10.5281/zenodo.6815412
   :alt: DOI 10.5281/zenodo.6815412



Summary
=======
This library helps client to discover links that follow the 
`signposting`_ conventions, most notably `FAIR Signposting`_.

This can then be used to navigate between:

* Persistent identifiers
* HTML landing pages
* File downloads/items
* Structured metadata

Method
=======

The library works by inspecting the HTTP messages for
``Link`` headers from a given URI with `find_signposting_http`, which
which categorize them by their `rel` `Link relation`_ into a 
`Signposting` object with absolute URIs.

It is up to the clients of this library to decide how to further
navigate or retrieve the associated resources, e.g. using a 
RDF library like `rdflib`_ or retrieving resources using `urllib`_.

Future versions of this library may also provide ways to discover
FAIR signposting in HTML ``<link>`` annotations and in 
`linkset`_ documents.


Motivation
==========

`FAIR Signposting`_ has been proposed as a mechanism for automated clients to find 
metadata and persistent identifiers for FAIR data residing in repositories that follow
the traditional PID-to-landing-page metaphor. 

This avoids the need for client guesswork with content-negotiation, and allows structured 
metadata to be provided by the repository rather than just PID providers like DataCite. 

The main idea of FAIR Signposting is to re-use the existing HTTP mechanism for links, using
existing relations like ``describedby``, ``cite-as`` and ``item``.

The aim of this library is to assist such clients to find and consume FAIR resources
for further processing. It is out of scope for this code to handle parsing of the 
structured metadata files.


Copyright and license
=====================

© Copyright 2022 The University of Manchester, UK.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

SPDX-License-Identifier: Apache-2.0

See the `authors`_ page for a full list of contributors.


How to use this repository
==========================

The `documentation`_ pages explain briefly how to use this library including a listing of modules and methods.


Issues and Discussions
======================

As usual in any GitHub based project, raise an `issue`_ if you find any bug or have other suggestions; or open a `discussion`_  if you want to discuss or talk :-)

Version
=======

v0.9.6

.. _GitHub Actions: https://github.com/features/actions
.. _PyPI: https://pypi.org
.. _bump2version: https://github.com/c4urself/bump2version
.. _discussion: https://github.com/stain/signposting/discussions
.. _documentation: https://signposting.readthedocs.io/
.. _issue: https://github.com/stain/signposting/issues
.. _main branch: https://github.com/stain/signposting/tree/main
.. _pdb-tools: https://github.com/haddocking/pdb-tools
.. _project's documentation: https://signposting.readthedocs.io/en/latest/index.html
.. _pytest: https://docs.pytest.org/en/stable/git
.. _test.pypi.org: https://test.pypi.org
.. _ReadTheDocs: https://readthedocs.org/
.. _signposting: https://signposting.org/conventions/
.. _FAIR Signposting: https://signposting.org/FAIR/
.. _Link Relation: https://www.iana.org/assignments/link-relations/
.. _rdflib: https://rdflib.readthedocs.io/en/stable/
.. _urllib: https://docs.python.org/3/library/urllib.html
.. _linkset: https://signposting.org/FAIR/#linksetrec
.. _authors: https://signposting.readthedocs.io/en/latest/authors.html

Changelog
=========

v0.9.6 (2024-01-08)
------------------------------------------------------------

v0.9.5 (2024-01-08)
------------------------------------------------------------

* Updated changelog and codemeta contributors

v0.9.4 (2023-11-16)
------------------------------------------------------------
* permit relative URIs

v0.9.3 (2023-09-21)
------------------------------------------------------------
* Fix error in text (contributed by Vincent Emonet)

v0.9.2 (2023-07-03)
------------------------------------------------------------

* Added `CITATION.cff`
* Allow `#fragments` in profile URIs (e.g. for JSON-LD)

v0.9.1 (2022-10-03)
------------------------------------------------------------
* Added `codemeta.json` and contributors

v0.9.0 (2022-10-03)
------------------------------------------------------------

* Deprecated ``Signposting.context_url``, use ``Signposting.context`` instead
* Removed deprecated ``find_signposting`` method, use ``find_signposting_http_link``

v0.8.3 (2022-10-02)
------------------------------------------------------------
* Fix typos, unused imports, missing docstring, and other small issues (contributed by Bruno P. Kinoshita)

v0.8.2 (2022-09-29)
------------------------------------------------------------

* Improved code coverage
* ``Signposting.linksets`` now included in iteration

v0.8.1 (2022-09-29)
------------------------------------------------------------
* Documentation markup fixes. 
* Indicated Development Status raised to Alpha

v0.8.0 (2022-09-29)
------------------------------------------------------------

* Added ``warn_duplicate`` option to ``Signposting`` constructor
* str() on ``Signposting`` now includes ``Link`` from other contexts
* ``Signposting`` added support for ``+`` (add) and ``|`` (merge) operations
* Added ``Signpost`` and ``Signposting`` support for ``==`` and ``hash()``
* str() on ``Signpost`` correctly shows context as ``anchor=``
* Added ``Signpost.with_context`` to change a signpost's for_context

v0.7.3 (2022-09-29)
------------------------------------------------------------

* Prototyped operators for ``Signposting`` and ``Signpost``
* Revised API documentation and cross-links
* Further code coverage by tests

v0.7.2 (2022-09-26)
------------------------------------------------------------

* Prototyped Signpost/Signposting support for ``==`` and ``hash()``
* Prototyped ``Signpost.with_context`` to change a signpost's for_context

v0.7.1 (2022-08-22)
------------------------------------------------------------
* README updates

v0.7.0 (2022-08-20)
------------------------------------------------------------

* Support multiple context in ``Signposting`` -- users of ``find_signposting_linkset`` should take particularly care to look up using ``for_context``
* RFC7231 update: Don't resolve context according to ``Content-Location`` header

v0.6.1 (2022-08-19)
------------------------------------------------------------

* `find_signposting_linkset` listed in module

v0.6.0 (2022-08-14)
------------------------------------------------------------

* Linkset parsing exposed as ``find_signposting_linkset``
* Optional explicit content-negotiate for linksets
* Integration tests for linksets using a2a-fair-metrics benchmarks

v0.5.2 (2022-08-14)
------------------------------------------------------------

* Handle missing Content-Type header

v0.5.1 (2022-08-14)
------------------------------------------------------------

* Unit tests compatible with Python 3.7

v0.5.0 (2022-08-13)
------------------------------------------------------------

* Add experimental RFC9264 linkset parsing (text and json)

v0.4.0 (2022-08-13)
------------------------------------------------------------

* Renamed deprecated ``find_signposting``, renamed to ``find_signposting_http_link``
* More unit tests for ``signposting.htmllinks``

v0.3.3 (2022-08-12)
------------------------------------------------------------

* Documentation update

v0.3.2 (2022-08-12)
------------------------------------------------------------

* Unit tests for ``signposting.htmllinks``

v0.3.1 (2022-08-11)
------------------------------------------------------------

* Refactor ``signposting.htmllinks`` module

v0.3.0 (2022-08-09)
------------------------------------------------------------

* Expose ``find_signposting_html`` in public API

v0.2.6 (2022-08-09)
------------------------------------------------------------

* Improved type safety in ``htmllinks``


v0.2.5 (2022-08-08)
------------------------------------------------------------

* Further documentation improvements
* Initial HTML parsing of <link> elements (import ``signposting.htmllinks`` for now)
* Added str/repr for ``Signposting`` and ``Signpost`` classes. ``str(s)`` return HTTP link headers.
* Added ``Signposting.signposts`` property
* ``Signposting`` is now iterable

v0.2.4 (2022-07-08)
------------------------------------------------------------

* Documentation improvements

v0.2.3 (2022-07-08)
------------------------------------------------------------

* Documentation update

v0.2.2 (2022-06-07)
------------------------------------------------------------

* Tidy up ``__init__.py`` public API

v0.2.1 (2022-06-05)
------------------------------------------------------------

* API Change: Refactored to new ``Signposting`` classes
  to avoid exposing the ``ParsedLink`` implementation.
* Note: ``Signposting`` attributes like ``.authors`` are now
  sets to indicate order is not (very) important.
* Removed rdflib dependency

v0.1.3 (2022-05-17)
------------------------------------------------------------
* Hide for now draft implementation

v0.1.2 (2022-05-17)
------------------------------------------------------------
* Draft implementation of ``Signposting`` classes

v0.1.1 (2022-04-13)
------------------------------------------------------------

* Build improvements

v0.1.0 (2022-04-13)
------------------------------------------------------------

* First 0.1 release

v0.0.15 (2022-04-13)
------------------------------------------------------------
* Documentation improvements

v0.0.14 (2022-04-13)
------------------------------------------------------------
* Documentation improvements

v0.0.13 (2022-04-13)
------------------------------------------------------------
* Documentation improvements

v0.0.12 (2022-04-13)
------------------------------------------------------------
* Documented example

v0.0.11 (2022-04-13)
------------------------------------------------------------
* Fix integration test for PID typo <https://w3id.org/a2a-fair-metrics/11-http-describedby-iri-wrong-type/>

v0.0.10 (2022-04-12)
------------------------------------------------------------
* Fix integration tests for PID typos <https://w3id.org/a2a-fair-metrics/24-http-citeas-204-no-content/> <https://w3id.org/a2a-fair-metrics/25-http-citeas-author-410-gone/> <https://w3id.org/a2a-fair-metrics/26-http-citeas-203-non-authorative/>
* Added rudimentary tests for <https://w3id.org/a2a-fair-metrics/27-http-linkset-json-only/> and <https://w3id.org/a2a-fair-metrics/28-http-linkset-txt-only/>
* Added tests for <https://w3id.org/a2a-fair-metrics/30-http-citeas-describedby-item-license-type-author-joint/>

v0.0.9 (2022-04-11)
------------------------------------------------------------
* Documented changelog for old versions

v0.0.8 (2022-04-11)
------------------------------------------------------------
 * Command line tool tested

v0.0.7 (2022-04-11)
------------------------------------------------------------
* Command line tool functional

v0.0.6 (2022-04-11)
------------------------------------------------------------
* Initial draft of command line tool

v0.0.5 (2022-04-10)
------------------------------------------------------------
* Handle 410 Gone and 203 Non-Authorative as warnings
* Tests against HTTP aspects of <https://s11.no/2022/a2a-fair-metrics/> for #1--#26

v0.0.4 (2022-04-06)
------------------------------------------------------------
* API Documentation drafted
* `find_landing_page` renamed `find_signposting_http`

v0.0.3 (2022-04-06)
------------------------------------------------------------
* README updates
* More tests until a2a-fair-metrics test #17

v0.0.2 (2022-04-06)
------------------------------------------------------------
* Initial HTTP Link header parsing

v0.0.1 (2022-04-01)
------------------------------------------------------------
* Generated from joaomcteixeira/python-project-skeleton

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