Rafforza i requisiti password con regole di complessità di mercato.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/models/admin_account.rb

@@ -1,4 +1,6 @@
 class AdminAccount < ApplicationRecord
+  include PasswordComplexity
+
   has_secure_password
 
   validates :username, presence: true, uniqueness: true

backend/app/models/concerns/password_complexity.rb

@@ -0,0 +1,55 @@
+# Criteri "di mercato" (stile Cognito/Auth0 bilanciato):
+# - minimo 8 caratteri (max 72 per bcrypt)
+# - almeno 3 classi su 4: minuscole, maiuscole, numeri, simboli
+module PasswordComplexity
+  extend ActiveSupport::Concern
+
+  MIN_LENGTH = 8
+  MAX_LENGTH = 72
+  REQUIRED_CLASSES = 3
+
+  CLASS_CHECKS = {
+    lowercase: /[a-z]/,
+    uppercase: /[A-Z]/,
+    digit: /\d/,
+    symbol: /[^A-Za-z0-9]/
+  }.freeze
+
+  class << self
+    def violation(password)
+      value = password.to_s
+      return :blank if value.blank?
+      return :too_short if value.length < MIN_LENGTH
+      return :too_long if value.bytesize > MAX_LENGTH
+      return :too_weak unless strong_enough?(value)
+
+      nil
+    end
+
+    def strong_enough?(password)
+      matched = CLASS_CHECKS.count { |_, pattern| password.match?(pattern) }
+      matched >= REQUIRED_CLASSES
+    end
+
+    def requirement_summary
+      I18n.t("password_policy.hint")
+    end
+  end
+
+  included do
+    validate :password_meets_complexity_policy, if: -> { password.present? }
+  end
+
+  private
+
+  def password_meets_complexity_policy
+    case PasswordComplexity.violation(password)
+    when :too_short
+      errors.add(:password, :too_short, count: MIN_LENGTH)
+    when :too_long
+      errors.add(:password, :too_long, count: MAX_LENGTH)
+    when :too_weak
+      errors.add(:password, :complexity)
+    end
+  end
+end

backend/app/models/user.rb

@@ -1,4 +1,6 @@
 class User < ApplicationRecord
+  include PasswordComplexity
+
   ROLES = %w[admin coach parent volunteer].freeze
 
   has_secure_password