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searx/engines/crossref.py

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+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""CrossRef"""
+
+from urllib.parse import urlencode
+from datetime import datetime
+
+about = {
+    "website": "https://www.crossref.org/",
+    "wikidata_id": "Q5188229",
+    "official_api_documentation": "https://api.crossref.org",
+    "use_official_api": False,
+    "require_api_key": False,
+    "results": "JSON",
+}
+
+categories = ["science", "scientific publications"]
+paging = True
+search_url = "https://api.crossref.org/works"
+
+
+def request(query, params):
+    params["url"] = search_url + "?" + urlencode({"query": query, "offset": 20 * (params["pageno"] - 1)})
+    return params
+
+
+def response(resp):
+    results = []
+    for record in resp.json()["message"]["items"]:
+
+        if record["type"] == "component":
+            # These seem to be files published along with papers. Not something you'd search for
+            continue
+        result = {
+            "template": "paper.html",
+            "content": record.get("abstract", ""),
+            "doi": record.get("DOI"),
+            "pages": record.get("page"),
+            "publisher": record.get("publisher"),
+            "tags": record.get("subject"),
+            "type": record.get("type"),
+            "url": record.get("URL"),
+            "volume": record.get("volume"),
+        }
+        if record["type"] == "book-chapter":
+            result["title"] = record["container-title"][0]
+            if record["title"][0].lower().strip() != result["title"].lower().strip():
+                result["title"] += f" ({record['title'][0]})"
+        else:
+            result["title"] = record["title"][0] if "title" in record else record.get("container-title", [None])[0]
+            result["journal"] = record.get("container-title", [None])[0] if "title" in record else None
+
+        if "resource" in record and "primary" in record["resource"] and "URL" in record["resource"]["primary"]:
+            result["url"] = record["resource"]["primary"]["URL"]
+        if "published" in record and "date-parts" in record["published"]:
+            result["publishedDate"] = datetime(*(record["published"]["date-parts"][0] + [1, 1][:3]))
+        result["authors"] = [a.get("given", "") + " " + a.get("family", "") for a in record.get("author", [])]
+        result["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"
+        # result["pdf_url"] = record.get("link", [{"URL": None}])[0]["URL"]
+
+        results.append(result)
+
+    return results