1 files changed, 59 insertions, 0 deletions
diff --git a/src/util/util/passwordStrength.ts b/src/util/util/passwordStrength.ts
new file mode 100644
index 00000000..1026a07e
--- /dev/null
+++ b/src/util/util/passwordStrength.ts
@@ -0,0 +1,59 @@
+import { Config } from ".";
+
+const reNUMBER = /[0-9]/g;
+const reUPPERCASELETTER = /[A-Z]/g;
+const reSYMBOLS = /[A-Z,a-z,0-9]/g;
+
+const blocklist: string[] = []; // TODO: update ones passwordblocklist is stored in db
+/*
+ * 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
+ * - shannon entropy folded into [0, 1) interval
+ *
+ * Returns: 0 > pw > 1
+ */
+export function checkPassword(password: string): number {
+ const { minLength, minNumbers, minUpperCase, minSymbols } = Config.get().register.password;
+ let strength = 0;
+
+ // checks for total password len
+ if (password.length >= minLength - 1) {
+ strength += 0.05;
+ }
+
+ // checks for amount of Numbers
+ if (password.count(reNUMBER) >= minNumbers - 1) {
+ strength += 0.05;
+ }
+
+ // checks for amount of Uppercase Letters
+ if (password.count(reUPPERCASELETTER) >= minUpperCase - 1) {
+ strength += 0.05;
+ }
+
+ // checks for amount of symbols
+ if (password.replace(reSYMBOLS, "").length >= minSymbols - 1) {
+ strength += 0.05;
+ }
+
+ // 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;
+ }
+
+ let entropyMap: { [key: string]: number } = {};
+ for (let i = 0; i < password.length; i++) {
+ if (entropyMap[password[i]]) entropyMap[password[i]]++;
+ else entropyMap[password[i]] = 1;
+ }
+
+ let entropies = Object.values(entropyMap);
+
+ entropies.map((x) => x / entropyMap.length);
+ strength += entropies.reduceRight((a: number, x: number) => a - x * Math.log2(x)) / Math.log2(password.length);
+ return strength;
+}
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