feat: add logs, modifier and throttling stuff

src/utils/limit-options.ts

@@ -0,0 +1,17 @@
+import rateLimit from "express-rate-limit";
+import slowDown from "express-slow-down";
+
+const limiter = rateLimit({
+  windowMs: 15 * 60 * 1000,
+  max: 50,
+  message: "Too nasty, please slow down"
+});
+
+const slow = slowDown({
+  delayAfter: 50,
+  windowMs: 15 * 60 * 1000,
+  delayMs: 1000,
+  maxDelayMs: 20000,
+});
+
+export { limiter, slow };

src/utils/logger.ts

@@ -0,0 +1,8 @@
+import pino from "pino";
+
+export const logger = pino({
+  level: "info",
+  transport: {
+    target: "pino-pretty"
+  },
+});

src/utils/modifier.ts

@@ -0,0 +1,39 @@
+/**
+ * Auto space on url
+ * @param str the string to be spaced
+ * @returns string
+ */
+export function spacer(str: string) {
+  return str.replace(/\s/g, "+");
+}
+
+/**
+ * Error handler
+ * @param success when success is false, it will return error
+ * @param message error message
+ * @returns object
+ */
+export function maybeError(success: boolean, message: string) {
+  return { success, message };
+}
+
+export function timeAgo(input: Date) {
+  const date = new Date(input);
+  const formatter: any = new Intl.RelativeTimeFormat("en");
+  const ranges: { [key: string]: number } = {
+    years: 3600 * 24 * 365,
+    months: 3600 * 24 * 30,
+    weeks: 3600 * 24 * 7,
+    days: 3600 * 24,
+    hours: 3600,
+    minutes: 60,
+    seconds: 1
+  };
+  const secondsElapsed = (date.getTime() - Date.now()) / 1000;
+  for (const key in ranges) {
+    if (ranges[key] < Math.abs(secondsElapsed)) {
+      const delta = secondsElapsed / ranges[key];
+      return formatter.format(Math.round(delta), key);
+    }
+  }
+}