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https://github.com/dnlbauer/django-signposting.git
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6b1ea1403c
* improvate jsonld parsing to be compatible with ro-crate * refactoring * example with RO-Crate * bump version --------- Co-authored-by: Daniel Bauer <daniel.bauer@senckenberg.de>
87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
import json
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from django.http import HttpResponse
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from rdflib import Graph
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from signposting import Signpost, LinkRel
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import re
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from django_signposting import sparql
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def add_signposts(response: HttpResponse, *args: Signpost):
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""" Adds signposting headers to the responses.
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params:
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response - the response object
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args - a list of signposts to add to this resposnse.
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"""
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if not hasattr(response, '_signposts'):
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response._signposts = []
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for signpost in args:
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if signpost not in response._signposts:
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response._signposts.append(signpost)
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def select_url(elements: tuple[str, ...]) -> str | None:
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def is_url(url: str) -> bool:
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url_pattern = re.compile(
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r"^(https?|ftp)://" # protocol
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r"(?:(?:[a-zA-Z0-9-_]+\.)?[a-zA-Z0-9-]+\.[a-zA-Z]{2,6})" # domain
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r"(?::\d{1,5})?" # optional port
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r"(?:/.*)?$" # path
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)
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return bool(url_pattern.match(url))
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for elem in elements[::-1]:
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if is_url(str(elem)):
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return str(elem)
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return None
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def jsonld_to_signposts(jsonld: dict) -> []:
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signposts = []
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# TODO use jsonld context in query as prefix
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g = Graph().parse(data=json.dumps(jsonld), format="json-ld")
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rootElement = next(iter(sparql.root_element_query(g)), None)
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if rootElement:
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rootElement = rootElement[0]
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else:
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print("No root element found")
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return {}
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types = sparql.type_query(g, rootElement)
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for type in types:
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signposts.append(Signpost(LinkRel.type, str(type[0])))
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authors = sparql.author_query(g, rootElement)
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for author in authors:
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author = select_url(author)
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if author:
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signposts.append(Signpost(LinkRel.author, author))
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license = next(iter(sparql.license_query(g, rootElement)), [])
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license = select_url(license)
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if license:
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signposts.append(Signpost(LinkRel.license, license))
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citations = sparql.cite_query(g, rootElement)
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for citation in citations:
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citation = select_url(citation)
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if citation:
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signposts.append(Signpost(LinkRel.cite_as, citation))
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sameas = sparql.sameas_query(g, rootElement)
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for sa in sameas:
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sa_media_type = sa[-1]
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sa = select_url(sa[:-1])
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if sa:
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signposts.append(Signpost(LinkRel.describedby, sa, sa_media_type))
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items = sparql.item_query(g, rootElement)
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for item in items:
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item_media_type = item[-1]
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item = select_url(item[:-1])
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if item:
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signposts.append(Signpost(LinkRel.item, item, item_media_type))
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return signposts
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