Infer DOI from ArXiv identifier

CHANGELOG.md

@@ -27,6 +27,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - When searching for an identifier in the "Web search", the title of the search window is now "Identifier-based Web Search". [#10391](https://github.com/JabRef/jabref/pull/10391)
 - The ampersand checker now skips verbatim fields (`file`, `url`, ...). [#10419](https://github.com/JabRef/jabref/pull/10419)
 - If no existing document is selected for exporting "XMP annotated pdf" JabRef will now create a new PDF file with a sample text and the metadata. [#10102](https://github.com/JabRef/jabref/issues/10102)
+- We modified the DOI cleanup to infer the DOI from an ArXiV ID if it's present. [10426](https://github.com/JabRef/jabref/issues/10426)
 
 ### Fixed
 

src/main/java/org/jabref/logic/cleanup/DoiCleanup.java

@@ -13,17 +13,19 @@
 import org.jabref.model.entry.field.Field;
 import org.jabref.model.entry.field.StandardField;
 import org.jabref.model.entry.field.UnknownField;
+import org.jabref.model.entry.identifier.ArXivIdentifier;
 import org.jabref.model.entry.identifier.DOI;
 
 /**
- * Formats the DOI (e.g. removes http part) and also moves DOIs from note, url or ee field to the doi field.
+ * Formats the DOI (e.g. removes http part) and also infers DOIs from the note, url, eprint or ee fields.
  */
 public class DoiCleanup implements CleanupJob {
 
     /**
      * Fields to check for DOIs.
      */
-    private static final List<Field> FIELDS = Arrays.asList(StandardField.NOTE, StandardField.URL, new UnknownField("ee"));
+    private static final List<Field> FIELDS = Arrays.asList(StandardField.NOTE, StandardField.URL, StandardField.EPRINT,
+            new UnknownField("ee"));
 
     @Override
     public List<FieldChange> cleanup(BibEntry entry) {
@@ -57,14 +59,25 @@ public List<FieldChange> cleanup(BibEntry entry) {
         } else {
             // As the Doi field is empty we now check if note, url, or ee field contains a Doi
             for (Field field : FIELDS) {
-                Optional<DOI> doi = entry.getField(field).flatMap(DOI::parse);
+                Optional<String> fieldContentOpt = entry.getField(field);
+
+                Optional<DOI> doi = fieldContentOpt.flatMap(DOI::parse);
 
                 if (doi.isPresent()) {
                     // Update Doi
                     Optional<FieldChange> change = entry.setField(StandardField.DOI, doi.get().getDOI());
                     change.ifPresent(changes::add);
                     removeFieldValue(entry, field, changes);
                 }
+
+                if (StandardField.EPRINT == field) {
+                    fieldContentOpt.flatMap(ArXivIdentifier::parse)
+                                   .flatMap(ArXivIdentifier::inferDOI)
+                                   .ifPresent(inferredDoi -> {
+                                       Optional<FieldChange> change = entry.setField(StandardField.DOI, inferredDoi.getDOI());
+                                       change.ifPresent(changes::add);
+                                   });
+                }
             }
         }
         return changes;

src/main/java/org/jabref/model/entry/identifier/ArXivIdentifier.java

@@ -9,10 +9,14 @@
 
 import org.jabref.model.strings.StringUtil;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * Identifier for the arXiv. See https://arxiv.org/help/arxiv_identifier
  */
 public class ArXivIdentifier extends EprintIdentifier {
+    private static final Logger LOGGER = LoggerFactory.getLogger(ArXivIdentifier.class);
 
     private static final String ARXIV_PREFIX = "http(s)?://arxiv.org/(abs|pdf)/|arxiv|arXiv";
     private final String identifier;
@@ -71,6 +75,22 @@ public Optional<String> getClassification() {
         }
     }
 
+    /**
+     * ArXiV articles are assigned DOIs automatically, which starts with a DOI prefix '10.48550/' followed by the ArXiV
+     * ID (replacing the colon with a period).
+     *<p>
+     * For more information:
+     * <a href="https://blog.arxiv.org/2022/02/17/new-arxiv-articles-are-now-automatically-assigned-dois/">
+     *     new-arxiv-articles-are-now-automatically-assigned-dois</a>
+     * */
+    public Optional<DOI> inferDOI() {
+        if (StringUtil.isBlank(identifier)) {
+            return Optional.empty();
+        }
+
+        return DOI.parse("10.48550/arxiv." + identifier);
+    }
+
     @Override
     public String toString() {
         return "ArXivIdentifier{" +