2 files changed, 52 insertions, 0 deletions
diff --git a/src/util/Base64.ts b/src/util/Base64.ts
new file mode 100644
index 00000000..46cff77a
--- /dev/null
+++ b/src/util/Base64.ts
@@ -0,0 +1,47 @@
+const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+";
+
+// binary to string lookup table
+const b2s = alphabet.split("");
+
+// string to binary lookup table
+// 123 == 'z'.charCodeAt(0) + 1
+const s2b = new Array(123);
+for (let i = 0; i < alphabet.length; i++) {
+ s2b[alphabet.charCodeAt(i)] = i;
+}
+
+// number to base64
+export const ntob = (n: number): string => {
+ if (n < 0) return `-${ntob(-n)}`;
+
+ let lo = n >>> 0;
+ let hi = (n / 4294967296) >>> 0;
+
+ let right = "";
+ while (hi > 0) {
+ right = b2s[0x3f & lo] + right;
+ lo >>>= 6;
+ lo |= (0x3f & hi) << 26;
+ hi >>>= 6;
+ }
+
+ let left = "";
+ do {
+ left = b2s[0x3f & lo] + left;
+ lo >>>= 6;
+ } while (lo > 0);
+
+ return left + right;
+};
+
+// base64 to number
+export const bton = (base64: string) => {
+ let number = 0;
+ const sign = base64.charAt(0) === "-" ? 1 : 0;
+
+ for (let i = sign; i < base64.length; i++) {
+ number = number * 64 + s2b[base64.charCodeAt(i)];
+ }
+
+ return sign ? -number : number;
+};
diff --git a/src/util/String.ts b/src/util/String.ts
index 3a8e35a8..49fba237 100644
--- a/src/util/String.ts
+++ b/src/util/String.ts
@@ -1,4 +1,5 @@
import { Request } from "express";
+import { ntob } from "./Base64";
import { FieldErrors } from "./instanceOf";
export function checkLength(str: string, min: number, max: number, key: string, req: Request) {
@@ -11,3 +12,7 @@ export function checkLength(str: string, min: number, max: number, key: string,
});
}
}
+
+export function generateCode() {
+ return ntob(Date.now() + Math.randomIntBetween(0, 10000));
+}
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