1 files changed, 48 insertions, 0 deletions
diff --git a/src/util/passwordStrength.ts b/src/util/passwordStrength.ts
new file mode 100644
index 00000000..88155d82
--- /dev/null
+++ b/src/util/passwordStrength.ts
@@ -0,0 +1,48 @@
+import "missing-native-js-functions";
+import Config from "./Config";
+
+const reNUMBER = /[0-9]/g;
+const reUPPERCASELETTER = /[A-Z]/g;
+const reSYMBOLS = /[A-Z,a-z,0-9]/g;
+
+/*
+ * https://en.wikipedia.org/wiki/Password_policy
+ * password must meet following criteria, to be perfect:
+ * - min <n> chars
+ * - min <n> numbers
+ * - min <n> symbols
+ * - min <n> uppercase chars
+ *
+ * Returns: 0 > pw > 1
+ */
+export function check(password: string): number {
+ const { pwMinLength, pwMinNumbers, pwMinUpperCase, pwMinSymbols } = Config.get().register.password;
+ var strength = 0;
+
+ // checks for total password len
+ if (password.length >= pwMinLength - 1) {
+ strength += 0.25;
+ }
+
+ // checks for amount of Numbers
+ if (password.count(reNUMBER) >= pwMinNumbers - 1) {
+ strength += 0.25;
+ }
+
+ // checks for amount of Uppercase Letters
+ if (password.count(reUPPERCASELETTER) >= pwMinUpperCase - 1) {
+ strength += 0.25;
+ }
+
+ // checks for amount of symbols
+ if (password.replace(reSYMBOLS, "").length >= pwMinSymbols - 1) {
+ strength += 0.25;
+ }
+
+ // checks if password only consists of numbers or only consists of chars
+ if (password.length == password.count(reNUMBER) || password.length === password.count(reUPPERCASELETTER)) {
+ strength = 0;
+ }
+
+ return strength;
+}
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