Merge pull request #246 from RDFLib/david/prez-identifier-homepage-me…

…diatypes

David/prez identifier homepage mediatypes

prez/routers/management.py

@@ -1,8 +1,9 @@
 import logging
 import pickle
+from typing import Optional
 
 from aiocache import caches
-from fastapi import APIRouter
+from fastapi import APIRouter, Query, Depends
 from rdflib import BNode
 from rdflib import Graph, URIRef, Literal
 from rdflib.collection import Collection
@@ -11,24 +12,45 @@
 
 from prez.cache import endpoints_graph_cache
 from prez.config import settings
+from prez.dependencies import get_system_repo
 from prez.reference_data.prez_ns import PREZ
-from prez.renderers.renderer import return_rdf
-from prez.services.connegp_service import RDF_MEDIATYPES
+from prez.renderers.renderer import return_rdf, return_from_graph
+from prez.repositories import Repo
+from prez.services.connegp_service import RDF_MEDIATYPES, MediaType, NegotiatedPMTs
 
 router = APIRouter(tags=["Management"])
 log = logging.getLogger(__name__)
 
 
 @router.get("/", summary="Home page", tags=["Prez"])
-async def index():
+async def index(
+        request: Request,
+        system_repo: Repo = Depends(get_system_repo)
+):
     """Returns the following information about the API"""
+    pmts = NegotiatedPMTs(
+        headers=request.headers,
+        params=request.query_params,
+        classes=[PREZ.Object],
+        system_repo=system_repo,
+    )
+    await pmts.setup()
     g = Graph()
     g.bind("prez", "https://prez.dev/")
     g.bind("ont", "https://prez.dev/ont/")
     g.add((URIRef(settings.system_uri), PREZ.version, Literal(settings.prez_version)))
     g += endpoints_graph_cache
     g += await return_annotation_predicates()
-    return await return_rdf(g, "text/turtle", profile_headers={})
+    return await return_from_graph(
+        graph=g,
+        mediatype=pmts.selected["mediatype"],
+        profile=pmts.selected["profile"],
+        profile_headers=pmts.generate_response_headers(),
+        selected_class=pmts.selected["class"],
+        repo=system_repo,
+        system_repo=system_repo
+    )
+
 
 
 @router.get("/purge-tbox-cache", summary="Reset Tbox Cache")

prez/services/connegp_service.py

@@ -1,5 +1,6 @@
 import logging
 import re
+from enum import Enum
 from textwrap import dedent
 
 from pydantic import BaseModel
@@ -35,6 +36,26 @@
     "text/plain": "nt",  # text/plain is the old/deprecated mimetype for n-triples
 }
 
+class MediaType(str, Enum):
+    turtle = "text/turtle"
+    n3 = "text/n3"
+    nt = "application/n-triples"
+    json_ld = "application/ld+json"
+    xml = "application/rdf+xml"
+    anot_turtle = "text/anot+turtle"
+    anot_n3 = "text/anot+n3"
+    anot_nt = "application/anot+n-triples"
+    anot_json_ld = "application/anot+ld+json"
+    anot_xml = "application/anot+rdf+xml"
+    # Some common but incorrect mimetypes
+    application_rdf = "application/rdf"
+    application_rdf_xml = "application/rdf xml"
+    application_json = "application/json"
+    application_ld_json = "application/ld json"
+    text_ttl = "text/ttl"
+    text_ntriples = "text/ntriples"
+    text_plain = "text/plain"
+
 
 class TokenError(Exception):
     def __init__(self, *args):

prez/services/link_generation.py

@@ -2,7 +2,7 @@
 import time
 from string import Template
 
-from rdflib import Graph, Literal, URIRef, DCTERMS, BNode
+from rdflib import Graph, Literal, URIRef, BNode
 from rdflib.namespace import SH, RDF
 from sparql_grammar_pydantic import (
     IRI,
@@ -145,7 +145,7 @@ async def add_links_to_graph_and_cache(
     quads.append((uri, PREZ["link"], Literal(object_link), uri))
     for uri_in_link_string, curie_in_link_string in identifiers.items():
         quads.append(
-            (uri_in_link_string, DCTERMS.identifier, Literal(curie_in_link_string, datatype=PREZ.identifier), uri)
+            (uri_in_link_string, PREZ.identifier, Literal(curie_in_link_string), uri)
         )
     if (
             members_link