[PM-7290] replace legacy abstraction with generation algorithms (#9435)

* replace legacy abstraction with generation algorithms
* delete mv2-based generator services

libs/common/src/tools/generator/random.ts

@@ -0,0 +1,62 @@
+import { CryptoService } from "@bitwarden/common/platform/abstractions/crypto.service";
+
+import { Randomizer } from "./abstractions/randomizer";
+import { WordOptions } from "./word-options";
+
+/** A randomizer backed by a CryptoService. */
+export class CryptoServiceRandomizer implements Randomizer {
+  constructor(private crypto: CryptoService) {}
+
+  async pick<Entry>(list: Array<Entry>) {
+    const index = await this.uniform(0, list.length - 1);
+    return list[index];
+  }
+
+  async pickWord(list: Array<string>, options?: WordOptions) {
+    let word = await this.pick(list);
+
+    if (options?.titleCase ?? false) {
+      word = word.charAt(0).toUpperCase() + word.slice(1);
+    }
+
+    if (options?.number ?? false) {
+      const num = await this.crypto.randomNumber(1, 9999);
+      word = word + this.zeroPad(num.toString(), 4);
+    }
+
+    return word;
+  }
+
+  // ref: https://stackoverflow.com/a/12646864/1090359
+  async shuffle<T>(items: Array<T>, options?: { copy?: boolean }) {
+    const shuffled = options?.copy ?? true ? [...items] : items;
+
+    for (let i = items.length - 1; i > 0; i--) {
+      const j = await this.uniform(0, i);
+      [items[i], items[j]] = [items[j], items[i]];
+    }
+
+    return shuffled;
+  }
+
+  async chars(length: number) {
+    let str = "";
+    const charSet = "abcdefghijklmnopqrstuvwxyz1234567890";
+    for (let i = 0; i < length; i++) {
+      const randomCharIndex = await this.uniform(0, charSet.length - 1);
+      str += charSet.charAt(randomCharIndex);
+    }
+    return str;
+  }
+
+  async uniform(min: number, max: number) {
+    return this.crypto.randomNumber(min, max);
+  }
+
+  // ref: https://stackoverflow.com/a/10073788
+  private zeroPad(number: string, width: number) {
+    return number.length >= width
+      ? number
+      : new Array(width - number.length + 1).join("0") + number;
+  }
+}