Fix file field parser not recognizing online urls

Fixes #7882
JabRef · Jul 30, 2021 · c372987 · c372987
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -22,6 +22,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 - We fixed an issue when checking for a new version when JabRef is used behind a corporate proxy. [#7884](https://github.com/JabRef/jabref/issues/7884)
 - We fixed an issue where it was impossible to add or modify groups. [#7912](https://github.com/JabRef/jabref/pull/793://github.com/JabRef/jabref/pull/7921)
+- We fixed an issue where exported entries from a Citavi bib containing URLs could not be imported [#7892](https://github.com/JabRef/jabref/issues/7882)
 
 ### Removed
 

diff --git a/src/main/java/org/jabref/logic/importer/util/FileFieldParser.java b/src/main/java/org/jabref/logic/importer/util/FileFieldParser.java
@@ -9,7 +9,12 @@
 
 import org.jabref.model.entry.LinkedFile;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class FileFieldParser {
+    private static final Logger LOGGER = LoggerFactory.getLogger(FileFieldParser.class);
+
 
     public static List<LinkedFile> parse(String value) {
         List<LinkedFile> files = new ArrayList<>();
@@ -18,6 +23,17 @@ public static List<LinkedFile> parse(String value) {
             return files;
         }
 
+        if (LinkedFile.isOnlineLink(value.trim())) {
+            // needs to be modifiable
+            try {
+                return List.of(new LinkedFile(new URL(value), ""));
+            } catch (MalformedURLException e) {
+                LOGGER.error("invalid url", e);
+                return files;
+            }
+        }
+
+
         List<String> linkedFileData = new ArrayList<>();
         StringBuilder sb = new StringBuilder();
         boolean inXmlChar = false;

diff --git a/src/test/java/org/jabref/logic/importer/util/FileFieldParserTest.java b/src/test/java/org/jabref/logic/importer/util/FileFieldParserTest.java
@@ -136,6 +136,18 @@ private static Stream<Arguments> stringsToParseTestData() throws Exception {
                 Arguments.of(
                         Collections.singletonList(new LinkedFile("desc", Path.of("file.pdf"), "PDF")),
                         "desc:file.pdf:PDF:asdf"
+                ),
+
+                // url
+                Arguments.of(
+                         Collections.singletonList(new LinkedFile(new URL("https://books.google.de/"), "")),
+                         "https://books.google.de/"
+                ),
+
+                // url as file
+                Arguments.of(
+                             Collections.singletonList(new LinkedFile("", new URL("http://ceur-ws.org/Vol-438"), "URL")),
+                             ":http\\:/ceur-ws.org/Vol-438:URL"
                 )
         );
     }