using server.method() instead of direct call to $.ajax - preparation for electron without network requests

public/javascripts/server.js

@@ -0,0 +1,51 @@
+const server = (function() {
+    function initAjax() {
+        $.ajaxSetup({
+            headers: {
+                'x-protected-session-id': typeof protected_session !== 'undefined' ? protected_session.getProtectedSessionId() : null
+            }
+        });
+    }
+
+    async function get(url) {
+        return await ajax('GET', url);
+    }
+
+    async function post(url, data) {
+        return await ajax('POST', url, data);
+    }
+
+    async function put(url, data) {
+        return await ajax('PUT', url, data);
+    }
+
+    async function remove(url) {
+        return await ajax('DELETE', url);
+    }
+
+    async function ajax(method, url, data) {
+        const options = {
+            url: baseApiUrl + url,
+            type: method
+        };
+
+        if (data) {
+            options.data = JSON.stringify(data);
+            options.contentType = "application/json";
+        }
+
+        return await $.ajax(options).catch(e => {
+            showError("Error when calling " + method + " " + url + ": " + e);
+        });
+    }
+
+    initAjax();
+
+    return {
+        get,
+        post,
+        put,
+        remove,
+        initAjax
+    }
+})();