Prevent syncing package list between different versions, fix bug

www/assets/js/packages.js

@@ -177,6 +177,7 @@ function addPackage(address, latitude, longitude, type, callback, deadline) {
 function importPackageList(newlist) {
     skipped = 0;
     let count = 0;
+    if (packages.length > 0) {
         for (latlng in newlist) {
             var latitude = newlist[latlng].coords[0];
             var longitude = newlist[latlng].coords[1];
@@ -192,6 +193,7 @@ function importPackageList(newlist) {
                         for (var j in packages[i].items) {
                             if (packages[i].items[j].id == newpackage.id) {
                                 // This package already exists in the local database.
+                                console.log("Skipping package ", newpackage);
                                 added = true;
                                 skipped++;
                             }
@@ -209,6 +211,11 @@ function importPackageList(newlist) {
                 }
             }
         }
+    } else {
+        // internal list is empty, so just copy
+        packages = newlist;
+        skipped = -1;
+    }
     setStorage("packages", JSON.stringify(packages));
 
     appendActivityLog("Imported List", count + " items added", "", "fas fa-file-download");

www/assets/js/toolbox_sharelist.js

@@ -17,7 +17,8 @@ function uploadList() {
         dataType: 'json',
         method: 'post',
         data: {
-            packages: JSON.stringify(packages)
+            packages: JSON.stringify(packages),
+            appversion: app_version
         },
         timeout: 15 * 1000,
         success: function (resp) {
@@ -69,9 +70,20 @@ function downloadItemList(code) {
                     downloadlistdialogopen = false;
                 }
                 if (resp.status == "OK") {
+                    if (typeof resp.appversion == "string") {
+                        if (resp.appversion != app_version) {
+                            app.dialog.alert("The sender is using " + app.name + " verson " + resp.appversion + " but you have " + app_version + ". Both devices must have the same version installed.", "Version Mismatch");
+                            return;
+                        }
+                    } else {
+                        app.dialog.alert("The sender is using an old version of " + app.name + ". Both devices must have the same version installed.", "Version Mismatch");
+                        return;
+                    }
                     var skipped = importPackageList(resp.packages);
                     if (skipped > 0) {
                         app.dialog.alert("List imported and merged with the existing one. " + skipped + " items already existed locally and were skipped. Verify their delivery status manually.", "Import Complete");
+                    } else if (skipped == -1) {
+                        app.dialog.alert("List imported.", "Import Complete");
                     } else {
                         app.dialog.alert("List imported and merged with the existing one.", "Import Complete");
                     }