util: generateRandomString func

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/util.test.ts

@@ -335,6 +335,22 @@ describe('formatFileSize', () => {
   });
 });
 
+describe('generateRandomString', () => {
+  it('should generate a random string of default length 10', async () => {
+    const res = Util.generateRandomString();
+    expect(typeof res).toBe('string');
+    expect(res.length).toBe(10);
+    expect(/^[0-9a-f]+$/i.test(res)).toBe(true);
+  });
+  it('should generate a random string of specified length', async () => {
+    const length = 15;
+    const res = Util.generateRandomString(length);
+    expect(typeof res).toBe('string');
+    expect(res.length).toBe(15);
+    expect(/^[0-9a-f]+$/i.test(res)).toBe(true);
+  });
+});
+
 // See: https://github.com/actions/toolkit/blob/a1b068ec31a042ff1e10a522d8fdf0b8869d53ca/packages/core/src/core.ts#L89
 function getInputName(name: string): string {
   return `INPUT_${name.replace(/ /g, '_').toUpperCase()}`;

src/util.ts

@@ -174,4 +174,9 @@ export class Util {
     const i = Math.floor(Math.log(bytes) / Math.log(k));
     return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
   }
+
+  public static generateRandomString(length = 10) {
+    const bytes = crypto.randomBytes(Math.ceil(length / 2));
+    return bytes.toString('hex').slice(0, length);
+  }
 }