move nodejs folder to javascript

javascript/src/index.ts

@@ -0,0 +1,101 @@
+import * as ejs from "ejs";
+
+import templateString from "./templates/template.ejs";
+import cssString from "./templates/main.css";
+
+export interface StatusItem {
+  status?: "ok" | "error";
+  status_text?: string;
+  status_text_color?: string;
+  location?: string;
+  name?: string;
+}
+
+export interface MoreInformation {
+  hidden?: boolean;
+  link?: string;
+  text?: string;
+  for?: string;
+}
+
+export interface PerfSecBy {
+  link?: string;
+  text?: string;
+}
+
+export interface CreatorInfo {
+  hidden?: boolean;
+  link?: string;
+  text?: string;
+}
+
+export interface ErrorPageParams {
+  error_code?: number;
+  title?: string;
+  html_title?: string;
+  time?: string;
+  ray_id?: string;
+  client_ip?: string;
+
+  browser_status?: StatusItem;
+  cloudflare_status?: StatusItem;
+  host_status?: StatusItem;
+
+  error_source?: "browser" | "cloudflare" | "host";
+
+  what_happened?: string;
+  what_can_i_do?: string;
+
+  more_information?: MoreInformation;
+  perf_sec_by?: PerfSecBy;
+  creator_info?: CreatorInfo;
+}
+
+// Load EJS template
+export const baseTemplate: ejs.TemplateFunction = ejs.compile(templateString);
+
+/**
+ * Generate random hex string for ray-id
+ */
+function genHexString(digits: number): string {
+  const hex = "0123456789ABCDEF";
+  let output = "";
+  for (let i = 0; i < digits; i++) {
+    output += hex.charAt(Math.floor(Math.random() * hex.length));
+  }
+  return output;
+}
+
+/**
+ * Render a customized Cloudflare error page
+ * @param params - The parameters for the error page
+ * @param allowHtml - Whether to allow HTML in what_happened and what_can_i_do fields (default: true)
+ * @param moreArgs - More arguments passed to ejs template
+ * @returns The rendered HTML string
+ */
+export function render(
+  params: ErrorPageParams,
+  allowHtml: boolean = true,
+  moreArgs: {
+    [name: string]: any;
+  } = {}
+): string {
+  params = { ...params };
+
+  if (!params.time) {
+    const now = new Date();
+    params.time = now.toISOString().replace("T", " ").substring(0, 19) + " UTC";
+  }
+  if (!params.ray_id) {
+    params.ray_id = genHexString(16);
+  }
+
+  if (!allowHtml) {
+    params.what_happened = ejs.escapeXML(params.what_happened ?? "");
+    params.what_can_i_do = ejs.escapeXML(params.what_can_i_do ?? "");
+  }
+
+  return baseTemplate({ params, html_style: cssString, ...moreArgs });
+}
+
+export default render;