IQSS · stevenwinship · Mar 20, 2026
diff --git a/doc/release-notes/11733-api-get-file-citation-format.md b/doc/release-notes/11733-api-get-file-citation-format.md
@@ -0,0 +1,4 @@
+### Feature New API ###
+New API added to retrieve the DataFile Citation in a requested format. This is similar output to the API to get the Dataset Citation.
+
+SERVER_URL/api/access/datafile/{fileId}/citation/{format}
diff --git a/doc/sphinx-guides/source/api/dataaccess.rst b/doc/sphinx-guides/source/api/dataaccess.rst
@@ -254,6 +254,26 @@ Value           Description
 ID              Exports file with specific file metadata ``ID``.
 ==============  ===========
 
+
+.. _datafile-citation-formatted-access:
+
+Citation - Get Citation In Other Formats
+----------------------------------------
+
+Dataverse can generate datafile citations in "EndNote", "RIS", "BibTeX", and "CSL" formats.
+This API call sends the raw format with the appropriate content-type (EndNote is XML, RIS and BibTeX are plain text, and CSL is JSON). ("Internal" is also a valid value, returning the content as HTML).
+This API call requires a format in the API call which can be any of the values listed above.
+
+Usage example:
+
+.. code-block:: bash
+
+  export SERVER_URL=https://demo.dataverse.org
+  export DATAFILE_ID=99
+  export FORMAT=EndNote
+
+  curl "$SERVER_URL/api/access/datafile/$DATAFILE_ID/citation/$FORMAT"
+
 .. _data-variable-metadata-access:
 
 Data Variable Metadata Access

diff --git a/doc/sphinx-guides/source/api/native-api.rst b/doc/sphinx-guides/source/api/native-api.rst
@@ -4095,6 +4095,8 @@ Usage example:
 
 The type under CSL can vary based on the dataset type, with "dataset", "software", and "review" as supported values. See also :ref:`dataset-types`.
 
+.. note:: You can also get the Datafile Citation by using the Access Datafile API. See: :ref:`datafile-citation-formatted-access`.
+
 Get Citation by Preview URL Token
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

diff --git a/src/main/java/edu/harvard/iq/dataverse/DataCitation.java b/src/main/java/edu/harvard/iq/dataverse/DataCitation.java
@@ -5,55 +5,40 @@
  */
 package edu.harvard.iq.dataverse;
 
+import de.undercouch.citeproc.csl.CSLItemDataBuilder;
+import de.undercouch.citeproc.csl.CSLName;
+import de.undercouch.citeproc.csl.CSLNameBuilder;
+import de.undercouch.citeproc.csl.CSLType;
+import de.undercouch.citeproc.helper.json.JsonBuilder;
+import de.undercouch.citeproc.helper.json.StringJsonBuilderFactory;
 import edu.harvard.iq.dataverse.branding.BrandingUtil;
 import edu.harvard.iq.dataverse.dataset.DatasetType;
 import edu.harvard.iq.dataverse.harvest.client.HarvestingClient;
 import edu.harvard.iq.dataverse.pidproviders.AbstractPidProvider;
+import edu.harvard.iq.dataverse.util.BundleUtil;
+import edu.harvard.iq.dataverse.util.DateUtil;
+import edu.harvard.iq.dataverse.util.PersonOrOrgUtil;
+import edu.harvard.iq.dataverse.util.SystemConfig;
+import edu.harvard.iq.dataverse.util.json.JsonUtil;
+import jakarta.ejb.EJBException;
+import jakarta.json.JsonObject;
+import jakarta.ws.rs.core.MediaType;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.text.StringEscapeUtils;
 
-import java.io.BufferedWriter;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.OutputStream;
-import java.io.OutputStreamWriter;
-import java.io.Writer;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamWriter;
+import java.io.*;
 import java.nio.charset.StandardCharsets;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-import jakarta.ejb.EJBException;
-import jakarta.json.JsonObject;
-import jakarta.ws.rs.core.MediaType;
-
-import javax.xml.stream.XMLOutputFactory;
-import javax.xml.stream.XMLStreamException;
-import javax.xml.stream.XMLStreamWriter;
-
-import edu.harvard.iq.dataverse.util.BundleUtil;
-import edu.harvard.iq.dataverse.util.DateUtil;
-import edu.harvard.iq.dataverse.util.PersonOrOrgUtil;
-import edu.harvard.iq.dataverse.util.SystemConfig;
-import edu.harvard.iq.dataverse.util.json.JsonUtil;
-
-import org.apache.commons.text.StringEscapeUtils;
-
-import de.undercouch.citeproc.csl.CSLItemDataBuilder;
-import de.undercouch.citeproc.csl.CSLName;
-import de.undercouch.citeproc.csl.CSLNameBuilder;
-import de.undercouch.citeproc.csl.CSLType;
-import de.undercouch.citeproc.helper.json.JsonBuilder;
-import de.undercouch.citeproc.helper.json.StringJsonBuilderFactory;
-
-import org.apache.commons.lang3.StringUtils;
-
 import static edu.harvard.iq.dataverse.pidproviders.doi.AbstractDOIProvider.DOI_PROTOCOL;
 import static edu.harvard.iq.dataverse.pidproviders.handle.HandlePidProvider.HDL_PROTOCOL;
 import static edu.harvard.iq.dataverse.pidproviders.perma.PermaLinkPidProvider.PERMA_PROTOCOL;
@@ -99,6 +84,15 @@ public enum Format {
         BibTeX,
         CSL
     }
+
+    public static Format getFormat(String name) {
+        for (Format format : Format.values()) {
+            if (format.name().equalsIgnoreCase(name)) {
+                return format;
+            }
+        }
+        return null;
+    }
 
     public DataCitation(DatasetVersion dsv) {
         this(dsv, false);

diff --git a/src/main/java/edu/harvard/iq/dataverse/api/Access.java b/src/main/java/edu/harvard/iq/dataverse/api/Access.java
@@ -130,7 +130,29 @@ public class Access extends AbstractApiBean {
 
     private static final String DEFAULT_BUNDLE_NAME = "dataverse_files.zip";
     //@EJB
-
+
+    @GET
+    @AuthRequired
+    @Path("datafile/{fileId}/citation/{format}")
+    public Response datafileCitation(@Context ContainerRequestContext crc,
+                                     @PathParam("fileId") String fileId,
+                                     @PathParam("format") String formatString) {
+
+        DataCitation.Format format = DataCitation.getFormat(formatString);
+        if (format == null) {
+            return badRequest(BundleUtil.getStringFromBundle("datasets.api.citation.invalidFormat"));
+        }
+
+        DataFile df = findDataFileOrDieWrapper(fileId);
+
+        // This will throw a ForbiddenException if access isn't authorized:
+        checkAuthorization(crc, df);
+
+        String dataCitationFormatted = (new DataCitation(df.getFileMetadata())).toString(format, true, false);
+
+        return Response.ok().type(DataCitation.getCitationFormatMediaType(format, true)).entity(dataCitationFormatted).build();
+    }
+
     // TODO: 
     // versions? -- L.A. 4.0 beta 10
     @GET

diff --git a/src/test/java/edu/harvard/iq/dataverse/api/FilesIT.java b/src/test/java/edu/harvard/iq/dataverse/api/FilesIT.java
@@ -4060,4 +4060,73 @@ public void testDownloadFileWithGuestbookResponse() throws IOException, JsonPars
         signedUrlResponse = get(signedUrl);
         assertEquals(OK.getStatusCode(), signedUrlResponse.getStatusCode());
     }
+
+    @Test
+    public void testGetFileCitationFormatted() {
+        Response createUser = UtilIT.createRandomUser();
+        createUser.then().assertThat().statusCode(OK.getStatusCode());
+        String apiToken = UtilIT.getApiTokenFromResponse(createUser);
+
+        Response createDataverseResponse = UtilIT.createRandomDataverse(apiToken);
+        createDataverseResponse.then().assertThat().statusCode(CREATED.getStatusCode());
+        String dataverseAlias = UtilIT.getAliasFromResponse(createDataverseResponse);
+
+        Response createDatasetResponse = UtilIT.createRandomDatasetViaNativeApi(dataverseAlias, apiToken);
+        createDatasetResponse.then().assertThat().statusCode(CREATED.getStatusCode());
+        Integer datasetId = JsonPath.from(createDatasetResponse.body().asString()).getInt("data.id");
+
+        String pathToTestFile = "src/test/resources/images/coffeeshop.png";
+        Response uploadFile = UtilIT.uploadFileViaNative(datasetId.toString(), pathToTestFile, Json.createObjectBuilder().build(), apiToken);
+        uploadFile.then().assertThat().statusCode(OK.getStatusCode());
+
+        String fileId = JsonPath.from(uploadFile.body().asString()).getString("data.files[0].dataFile.id");
+
+        // Test good formats
+        Response response = UtilIT.getFileCitationFormat(fileId,"EndNote", apiToken);
+        response.then().assertThat()
+                .statusCode(OK.getStatusCode());
+        assertTrue(response.prettyPrint().contains("<custom1>coffeeshop.png</custom1>"));
+
+        response = UtilIT.getFileCitationFormat(fileId,"RIS", apiToken);
+        response.then().assertThat()
+                .statusCode(OK.getStatusCode());
+        assertTrue(response.prettyPrint().contains("C1  - coffeeshop.png"));
+
+        response = UtilIT.getFileCitationFormat(fileId,"BibTeX", apiToken);
+        response.then().assertThat()
+                .statusCode(OK.getStatusCode());
+        assertTrue(response.prettyPrint().contains("author = {Finch, Fiona},"));
+
+        response = UtilIT.getFileCitationFormat(fileId,"CSL", apiToken);
+        response.then().assertThat()
+                .statusCode(OK.getStatusCode());
+        assertTrue(response.prettyPrint().contains("\"title\": \"Darwin's Finches\","));
+
+        response = UtilIT.getFileCitationFormat(fileId,"Internal", apiToken);
+        response.then().assertThat()
+                .statusCode(OK.getStatusCode());
+        assertTrue(response.prettyPrint().contains("coffeeshop.png [fileName]"));
+
+        // Test an unknown format
+        response = UtilIT.getFileCitationFormat(fileId,"bad", apiToken);
+        response.prettyPrint();
+        response.then().assertThat()
+                .statusCode(BAD_REQUEST.getStatusCode())
+                .body("message", equalTo(BundleUtil.getStringFromBundle("datasets.api.citation.invalidFormat")));
+        // Test an NULL format
+        response = UtilIT.getFileCitationFormat(fileId,null, apiToken);
+        response.prettyPrint();
+        response.then().assertThat()
+                .statusCode(BAD_REQUEST.getStatusCode())
+                .body("message", equalTo(BundleUtil.getStringFromBundle("datasets.api.citation.invalidFormat")));
+
+        // Test a user that doesn't have permission to get the citation
+        Response createUser2 = UtilIT.createRandomUser();
+        createUser2.then().assertThat().statusCode(OK.getStatusCode());
+        String apiToken2 = UtilIT.getApiTokenFromResponse(createUser2);
+        response = UtilIT.getFileCitationFormat(fileId,"EndNote",apiToken2);
+        response.prettyPrint();
+        response.then().assertThat()
+                .statusCode(FORBIDDEN.getStatusCode());
+    }
 }
diff --git a/src/test/java/edu/harvard/iq/dataverse/api/UtilIT.java b/src/test/java/edu/harvard/iq/dataverse/api/UtilIT.java
@@ -1443,6 +1443,12 @@ static Response getFileData(String fileId, String apiToken, String datasetVersio
                 .get("/api/files/" + fileId + "/versions/" + datasetVersionId);
     }
 
+    static Response getFileCitationFormat(String dataFileId, String format, String apiToken) {
+        return given()
+                .header(API_TOKEN_HTTP_HEADER, apiToken)
+                .get("/api/access/datafile/" + dataFileId +  "/citation/" + format);
+    }
+
     static Response getFileVersionDifferences(String fileId, String apiToken) {
         return getFileVersionDifferences(fileId, apiToken, null, null);
     }