Allow downloading savegames

src/js/core/read_write_proxy.js

@@ -79,6 +79,16 @@ export class ReadWriteProxy {
         return this.currentData;
     }
 
+    /**
+     *
+     * @param {object} obj
+     */
+    static serializeObject(obj) {
+        const jsonString = JSON_stringify(compressObject(obj));
+        const checksum = sha1(jsonString + salt);
+        return compressionPrefix + compressX64(checksum + jsonString);
+    }
+
     /**
      * Writes the data asychronously, fails if verify() fails
      * @returns {Promise<string>}

src/js/core/utils.js

@@ -859,3 +859,20 @@ export function formatSecondsToTimeAgo(secs) {
         return days + " days ago";
     }
 }
+
+/**
+ * Generates a file download
+ * @param {string} filename
+ * @param {string} text
+ */
+export function generateFileDownload(filename, text) {
+    var element = document.createElement("a");
+    element.setAttribute("href", "data:text/plain;charset=utf-8," + encodeURIComponent(text));
+    element.setAttribute("download", filename);
+
+    element.style.display = "none";
+    document.body.appendChild(element);
+
+    element.click();
+    document.body.removeChild(element);
+}