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# SPDX-License-Identifier: AGPL-3.0-or-later
"""Crossref_ is the sustainable source of community-owned scholarly metadata and
is relied upon by thousands of systems across the research ecosystem and the
globe.
.. _Crossref: https://www.crossref.org/documentation/retrieve-metadata/
"""
import typing as t
from urllib.parse import urlencode
from datetime import datetime
from searx.result_types import EngineResults
if t.TYPE_CHECKING:
from searx.extended_types import SXNG_Response
from searx.search.processors import OnlineParams
about = {
"website": "https://www.crossref.org/",
"wikidata_id": "Q5188229",
"official_api_documentation": "https://api.crossref.org/swagger-ui/",
"use_official_api": True,
"require_api_key": False,
"results": "JSON",
}
categories = ["science", "scientific publications"]
paging = True
search_url = "https://api.crossref.org/works"
"""Returns a list of all works (journal articles, conference proceedings, books,
components, etc), 20 per page (`Works/get_works`_).
.. _Works/get_works: https://api.crossref.org/swagger-ui/index.html#/Works/get_works
"""
def request(query: str, params: "OnlineParams") -> None:
args = {
"query": query,
"offset": 20 * (params["pageno"] - 1),
}
params["url"] = f"{search_url}?{urlencode(args)}"
def response(resp: "SXNG_Response") -> EngineResults:
res = EngineResults()
json_data = resp.json()
def field(k: str) -> str:
return str(record.get(k, ""))
for record in json_data["message"]["items"]:
if record["type"] == "component":
# These seem to be files published along with papers. Not something
# you'd search for.
continue
title: str = ""
journal: str = ""
if record["type"] == "book-chapter":
title = record["container-title"][0]
if record["title"][0].lower().strip() != title.lower().strip():
title += f" ({record['title'][0]})"
else:
title = record["title"][0] if "title" in record else record.get("container-title", [None])[0]
journal = record.get("container-title", [None])[0] if "title" in record else ""
item = res.types.Paper(
title=title,
journal=journal,
content=field("abstract"),
doi=field("DOI"),
pages=field("page"),
publisher=field("publisher"),
tags=record.get("subject"),
type=field("type"),
url=field("URL"),
volume=field("volume"),
)
res.add(item)
if "resource" in record and "primary" in record["resource"] and "URL" in record["resource"]["primary"]:
item.url = record["resource"]["primary"]["URL"]
if "published" in record and "date-parts" in record["published"]:
item.publishedDate = datetime(*(record["published"]["date-parts"][0] + [1, 1][:3]))
item.authors = [a.get("given", "") + " " + a.get("family", "") for a in record.get("author", [])]
item.isbn = record.get("isbn") or [i["value"] for i in record.get("isbn-type", [])]
# All the links are not PDFs, even if the URL ends with ".pdf"
# item.pdf_url = record.get("link", [{"URL": None}])[0]["URL"]
return res
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