Initial commit: Angular frontend and Expressjs backend

worklenz-backend/src/shared/password-strength-check.ts

@@ -0,0 +1,78 @@
+import {IPasswordValidityResult} from "../interfaces/password-validity-result";
+
+export class PasswordStrengthChecker {
+  private static readonly defaultOptions = [
+    {
+      value: 0,
+      text: "Too weak",
+      minDiversity: 0,
+      minLength: 0
+    },
+    {
+      value: 1,
+      text: "Weak",
+      minDiversity: 2,
+      minLength: 6
+    },
+    {
+      value: 2,
+      text: "Strong",
+      minDiversity: 4,
+      minLength: 8
+    },
+    {
+      value: 3,
+      text: "Excellent",
+      minDiversity: 4,
+      minLength: 10
+    }
+  ];
+  private static readonly defaultAllowedSymbols = "!\"#\$%&'\(\)\*\+,-\./:;<=>\?@\[\\\\\\]\^_`\{|\}~";
+
+  public static validate(password: string, options = this.defaultOptions, allowedSymbols = this.defaultAllowedSymbols): IPasswordValidityResult {
+    const passwordCopy = password || "";
+
+    options[0].minDiversity = 0;
+    options[0].minLength = 0;
+
+    const rules = [
+      {
+        regex: "[a-z]",
+        message: "lowercase"
+      },
+      {
+        regex: "[A-Z]",
+        message: "uppercase"
+      },
+      {
+        regex: "[0-9]",
+        message: "number"
+      },
+    ];
+
+    if (allowedSymbols) {
+      rules.push({
+        regex: `[${allowedSymbols}]`,
+        message: "symbol"
+      });
+    }
+
+    const strength: any = {};
+
+    strength.contains = rules
+      .filter(rule => new RegExp(`${rule.regex}`).test(passwordCopy))
+      .map(rule => rule.message);
+
+    strength.length = passwordCopy.length;
+
+    const fulfilledOptions = options
+      .filter(option => strength.contains.length >= option.minDiversity)
+      .filter(option => strength.length >= option.minLength)
+      .sort((o1, o2) => o2.value - o1.value)
+      .map(option => ({value: option.value, text: option.text}));
+
+    Object.assign(strength, fulfilledOptions[0]);
+
+    return strength;
+  }
+}