From bb373e9767b43921195ce4f891971e455988b99d Mon Sep 17 00:00:00 2001
From: Lennard Golsch <lennard.golsch@icloud.com>
Date: Thu, 7 Nov 2024 09:35:25 +0100
Subject: [PATCH] added uri resolver to find matching orcids for current user
 and object

---
 .../mycore/orcid2/util/MCRORCIDResolver.java  | 107 ++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 mycore-orcid2/src/main/java/org/mycore/orcid2/util/MCRORCIDResolver.java

diff --git a/mycore-orcid2/src/main/java/org/mycore/orcid2/util/MCRORCIDResolver.java b/mycore-orcid2/src/main/java/org/mycore/orcid2/util/MCRORCIDResolver.java
new file mode 100644
index 0000000000..28f7ea7cea
--- /dev/null
+++ b/mycore-orcid2/src/main/java/org/mycore/orcid2/util/MCRORCIDResolver.java
@@ -0,0 +1,107 @@
+/*
+ * This file is part of ***  M y C o R e  ***
+ * See https://www.mycore.de/ for details.
+ *
+ * MyCoRe is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * MyCoRe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.mycore.orcid2.util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+import javax.xml.transform.Source;
+import javax.xml.transform.URIResolver;
+
+import org.jdom2.Element;
+import org.jdom2.transform.JDOMSource;
+import org.mycore.datamodel.metadata.MCRMetadataManager;
+import org.mycore.datamodel.metadata.MCRObject;
+import org.mycore.datamodel.metadata.MCRObjectID;
+import org.mycore.mods.MCRMODSWrapper;
+import org.mycore.orcid2.MCRORCIDUtils;
+import org.mycore.orcid2.user.MCRORCIDSessionUtils;
+import org.mycore.orcid2.user.MCRORCIDUser;
+
+public class MCRORCIDResolver implements URIResolver {
+
+    /**
+     * Attempts to find a trusted ID match between the current user and the specified object.
+     * If a match is found, returns an XML `Source` containing all ORCID IDs associated with
+     * the current user; otherwise, an empty XML `Source` is returned.
+     *
+     * Expected syntax for `href`: <code>findOrcidsForCurrentUser:{objectId}</code>.
+     *
+     * @param href the URI containing the object ID to check
+     * @param base this parameter is not used
+     * @return an XML `Source` containing a list of ORCID IDs if a trusted ID match is found;
+     *         otherwise, an empty XML `Source`
+     * @throws IllegalArgument if `href` has an invalid syntax or if the specified object does not exist
+     */
+    @Override
+    public Source resolve(String href, String base) {
+        final MCRObjectID objectId = extractObjectIdFromHref(href);
+        if (!MCRMetadataManager.exists(objectId)) {
+            throw new IllegalArgumentException(objectId.toString() + " does not exist");
+        }
+        final MCRORCIDUser orcidUser = MCRORCIDSessionUtils.getCurrentUser();
+        final Set<String> currentUserOrcids = orcidUser.getORCIDs();
+        if (currentUserOrcids.isEmpty()) {
+            return createEmptyResultSource();
+        }
+        final Set<MCRIdentifier> currentUserTrustedIds = orcidUser.getTrustedIdentifiers();
+        if (currentUserTrustedIds.isEmpty()) {
+            return createEmptyResultSource();
+        }
+        final MCRObject object = MCRMetadataManager.retrieveMCRObject(objectId);
+        final Set<MCRIdentifier> objectNameIds = listNameIds(object);
+        if (currentUserTrustedIds.removeAll(objectNameIds)) {
+            return createResultSource(new ArrayList<>(currentUserOrcids));
+        }
+        return createEmptyResultSource();
+    }
+
+    private MCRObjectID extractObjectIdFromHref(String href) {
+        final String[] split = href.split(":", 2);
+        if (split.length < 2) {
+            throw new IllegalArgumentException("Invalid href format. Expected ':' in href: " + href);
+        }
+        final String objectIdString = split[1];
+        if (!MCRObjectID.isValid(objectIdString)) {
+            throw new IllegalArgumentException("Object id '" + objectIdString + "' is invalid.");
+        }
+        return MCRObjectID.getInstance(objectIdString);
+    }
+
+    public static Set<MCRIdentifier> listNameIds(MCRObject object) {
+        return MCRORCIDUtils.getNameIdentifiers(new MCRMODSWrapper(object));
+    }
+
+    private Source createEmptyResultSource() {
+        return createResultSource(Collections.emptyList());
+    }
+
+    private Source createResultSource(List<String> orcids) {
+        final Element orcidsElement = new Element("orcids");
+        orcids.stream().map(o -> {
+            final Element orcid = new Element("orcid");
+            orcid.setText(o);
+            return orcid;
+        }).forEach(orcidsElement::addContent);
+        return new JDOMSource(orcidsElement);
+    }
+
+}