remember me, password reset

app/controllers/password_resets_controller.rb

@@ -0,0 +1,79 @@
+class PasswordResetsController < ApplicationController
+  RESET_TOKEN_EXPIRY = 1.hour
+
+  def new
+    # Show request password reset form
+  end
+
+  def create
+    @user = User.find_by(email: params[:email]&.downcase&.strip)
+
+    if @user&.invitation_accepted_at.present?
+      @user.update!(
+        reset_password_token: SecureRandom.urlsafe_base64(32),
+        reset_password_sent_at: Time.current
+      )
+      PasswordResetMailer.reset(@user).deliver_later
+    else
+      @user.invite_by!
+      InvitationMailer.invite(@user).deliver_later
+    end
+
+    redirect_to login_path, notice: "If that email address is in our system, you will receive password reset instructions."
+  end
+
+  def edit
+    @user = User.find_by(reset_password_token: params[:token])
+
+    if @user.nil?
+      redirect_to login_path, alert: "Invalid password reset link."
+    elsif password_reset_expired?(@user)
+      redirect_to new_password_reset_path, alert: "Password reset link has expired. Please request a new one."
+    end
+  end
+
+  def update
+    @user = User.find_by(reset_password_token: params[:token])
+
+    if @user.nil?
+      redirect_to login_path, alert: "Invalid password reset link."
+      return
+    end
+
+    if password_reset_expired?(@user)
+      redirect_to new_password_reset_path, alert: "Password reset link has expired. Please request a new one."
+      return
+    end
+
+    if params[:password].blank?
+      flash.now[:alert] = "Password cannot be blank."
+      render :edit, status: :unprocessable_entity
+      return
+    end
+
+    if params[:password] != params[:password_confirmation]
+      flash.now[:alert] = "Password confirmation doesn't match."
+      render :edit, status: :unprocessable_entity
+      return
+    end
+
+    @user.password = params[:password]
+    @user.password_confirmation = params[:password_confirmation]
+    @user.reset_password_token = nil
+    @user.reset_password_sent_at = nil
+
+    if @user.save
+      session[:user_id] = @user.id
+      redirect_to root_path, notice: "Your password has been reset successfully."
+    else
+      flash.now[:alert] = @user.errors.full_messages.join(", ")
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def password_reset_expired?(user)
+    user.reset_password_sent_at < RESET_TOKEN_EXPIRY.ago
+  end
+end