Board copy work now again

- there was an error at attachment copy
- fixes: https://github.com/wekan/wekan/issues/4485#issue-1211353265

models/lib/fileStoreStrategy.js

@@ -336,3 +336,55 @@ export const moveToStorage = function(fileObj, storageDestination, fileStoreStra
     }
   });
 };
+
+export const copyFile = function(fileObj, newCardId, fileStoreStrategyFactory) {
+  const versionName = "original";
+  const strategyRead = fileStoreStrategyFactory.getFileStrategy(fileObj, versionName);
+  const readStream = strategyRead.getReadStream();
+  const strategyWrite = fileStoreStrategyFactory.getFileStrategy(fileObj, versionName, STORAGE_NAME_FILESYSTEM);
+
+  const tempPath = path.join(fileStoreStrategyFactory.storagePath, Random.id() + "-" + versionName + "-" + fileObj.name);
+  const writeStream = strategyWrite.getWriteStream(tempPath);
+
+  writeStream.on('error', error => {
+    console.error('[writeStream error]: ', error, fileObj._id);
+  });
+
+  readStream.on('error', error => {
+    console.error('[readStream error]: ', error, fileObj._id);
+  });
+
+  // https://forums.meteor.com/t/meteor-code-must-always-run-within-a-fiber-try-wrapping-callbacks-that-you-pass-to-non-meteor-libraries-with-meteor-bindenvironmen/40099/8
+  readStream.on('end', Meteor.bindEnvironment(() => {
+    const fileId = Random.id();
+    Attachments.addFile(
+      tempPath,
+      {
+        fileName: fileObj.name,
+        type: fileObj.type,
+        meta: {
+          boardId: fileObj.meta.boardId,
+          cardId: newCardId,
+          listId: fileObj.meta.listId,
+          swimlaneId: fileObj.meta.swimlaneId,
+          source: 'copy',
+          copyFrom: fileObj._id,
+        },
+        userId: fileObj.userId,
+        size: fileObj.fileSize,
+        fileId,
+      },
+      (err, fileRef) => {
+        if (err) {
+          console.log(err);
+        } else {
+          // Set the userId again
+          Attachments.update({ _id: fileRef._id }, { $set: { userId: fileObj.userId } });
+        }
+      },
+      true,
+    );
+  }));
+
+  readStream.pipe(writeStream);
+};