1 files changed, 60 insertions, 0 deletions

diff --git a/assets_src/js/lib/ajax.js b/assets_src/js/lib/ajax.js
new file mode 100644
index 0000000..048f516
--- /dev/null
+++ b/assets_src/js/lib/ajax.js
@@ -0,0 +1,60 @@
+export class AjaxError extends Error {
+        constructor(status, statusText) {
+                let message = `${status}: ${statusText}`
+                super(message);
+                this.name = this.constructor.name;
+                this.message = message;
+                this.status = status;
+                this.statusText = statusText;
+                Error.captureStackTrace(this, this.constructor.name)
+        }
+}
+
+function applyOptions(xhr, options) {
+        options.headers = options.headers || [];
+        for (let header in options.headers) {
+                xhr.setRequestHeader(header, options.headers[header]);
+        }
+}
+
+function createHandler(xhr, success, fail) {
+        return () => {
+                if (xhr.readyState !== XMLHttpRequest.DONE) {
+                        return;
+                }
+                if (xhr.status === 200) {
+                        success(xhr.response);
+                } else {
+                        fail(xhr.status, xhr.statusText);
+                }
+        };
+}
+
+function request(method, url, body, options) {
+        options = options || {};
+        return new Promise((resolve, reject) => {
+                let xhr = new XMLHttpRequest();
+                xhr.onreadystatechange = createHandler(
+                        xhr,
+                        (res) => {
+                                resolve(res);
+                        },
+                        (status, statusText) => {
+                                reject(new AjaxError(status, statusText));
+                        });
+                xhr.open(method, url, true);
+                applyOptions(xhr, options);
+                xhr.onerror = function() {
+                        reject(new AjaxError(-1, 'Network error'));
+                };
+                xhr.send(body);
+        });
+}
+
+export async function get(url, options) {
+        return request('GET', url, null, options);
+}
+
+export async function post(url, body, options) {
+        return request('POST', url, body, options);
+}