feat(core): add generatePassword utility function

#3677

npm/ng-packs/packages/core/src/lib/tests/generator-utils.spec.ts

@@ -1,4 +1,4 @@
-import { generateHash } from '../utils';
+import { generateHash, generatePassword } from '../utils';
 
 describe('GeneratorUtils', () => {
   describe('#generateHash', () => {
@@ -7,4 +7,37 @@ describe('GeneratorUtils', () => {
       expect(hash).toBe(1112440527);
     });
   });
+
+  describe('#generatePassword', () => {
+    const lowers = 'abcdefghijklmnopqrstuvwxyz';
+    const uppers = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    const numbers = '0123456789';
+    const specials = '!@#$%&*()_+{}<>?[]./';
+
+    test.each`
+      name         | charSet     | passwordLength
+      ${'lower'}   | ${lowers}   | ${7}
+      ${'upper'}   | ${uppers}   | ${6}
+      ${'number'}  | ${numbers}  | ${5}
+      ${'special'} | ${specials} | ${4}
+    `(
+      'should have a $name in the password that length is $passwordLength',
+      ({ _, charSet, passwordLength }) => {
+        const password = generatePassword(passwordLength);
+        expect(hasChar(charSet, password)).toBe(true);
+      },
+    );
+  });
 });
+
+function hasChar(charSet: string, password: string): boolean {
+  let matched = false;
+  charSet.split('').forEach(char => {
+    if (password.indexOf(char) > -1) {
+      matched = true;
+      return;
+    }
+  });
+
+  return matched;
+}

npm/ng-packs/packages/core/src/lib/utils/generator-utils.ts

@@ -17,3 +17,31 @@ export function generateHash(value: string): number {
   }
   return hashed;
 }
+
+export function generatePassword(length = 8) {
+  length = length < 4 ? 4 : length;
+
+  const lowers = 'abcdefghijklmnopqrstuvwxyz';
+  const uppers = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+  const numbers = '0123456789';
+  const specials = '!@#$%&*()_+{}<>?[]./';
+  const all = lowers + uppers + numbers + specials;
+
+  const getRandom = (chrSet: string) => chrSet[Math.floor(Math.random() * chrSet.length)];
+
+  let password = '';
+
+  password += getRandom(lowers);
+  password += getRandom(uppers);
+  password += getRandom(numbers);
+  password += getRandom(specials);
+
+  for (let i = 1; i <= length - 4; i++) {
+    password = password.concat(getRandom(all));
+  }
+
+  return password
+    .split('')
+    .sort(() => 0.5 - Math.random())
+    .join('');
+}