[PM-5609] passphrase settings component & services (#10535)

libs/tools/generator/components/src/util.ts

@@ -0,0 +1,68 @@
+import { ValidatorFn, Validators } from "@angular/forms";
+import { map, pairwise, pipe, skipWhile, startWith, takeWhile } from "rxjs";
+
+import { AnyConstraint, Constraints } from "@bitwarden/common/tools/types";
+import { UserId } from "@bitwarden/common/types/guid";
+import { CredentialGeneratorConfiguration } from "@bitwarden/generator-core";
+
+export function completeOnAccountSwitch() {
+  return pipe(
+    map(({ id }: { id: UserId | null }) => id),
+    skipWhile((id) => !id),
+    startWith(null as UserId),
+    pairwise(),
+    takeWhile(([prev, next]) => (prev ?? next) === next),
+    map(([_, id]) => id),
+  );
+}
+
+export function toValidators<Policy, Settings>(
+  target: keyof Settings,
+  configuration: CredentialGeneratorConfiguration<Settings, Policy>,
+  policy?: Constraints<Settings>,
+) {
+  const validators: Array<ValidatorFn> = [];
+
+  // widen the types to avoid typecheck issues
+  const config: AnyConstraint = configuration.settings.constraints[target];
+  const runtime: AnyConstraint = policy[target];
+
+  const required = getConstraint("required", config, runtime) ?? false;
+  if (required) {
+    validators.push(Validators.required);
+  }
+
+  const maxLength = getConstraint("maxLength", config, runtime);
+  if (maxLength !== undefined) {
+    validators.push(Validators.maxLength(maxLength));
+  }
+
+  const minLength = getConstraint("minLength", config, runtime);
+  if (minLength !== undefined) {
+    validators.push(Validators.minLength(config.minLength));
+  }
+
+  const min = getConstraint("min", config, runtime);
+  if (min !== undefined) {
+    validators.push(Validators.min(min));
+  }
+
+  const max = getConstraint("max", config, runtime);
+  if (max === undefined) {
+    validators.push(Validators.max(max));
+  }
+
+  return validators;
+}
+
+function getConstraint<Key extends keyof AnyConstraint>(
+  key: Key,
+  config: AnyConstraint,
+  policy?: AnyConstraint,
+) {
+  if (policy && key in policy) {
+    return policy[key] ?? config[key];
+  } else if (key in config) {
+    return config[key];
+  }
+}