Aggiedit/lib/aggiedit/accounts/user.ex

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Elixir
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defmodule Aggiedit.Accounts.User do
use Ecto.Schema
import Ecto.Changeset
alias Aggiedit.Rooms.Room
schema "users" do
field :email, :string
field :username, :string
field :password, :string, virtual: true, redact: true
field :hashed_password, :string, redact: true
field :confirmed_at, :naive_datetime
field :role, Ecto.Enum, values: [:user, :admin], default: :user
belongs_to :room, Room, on_replace: :update
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has_many :posts, Aggiedit.Rooms.Post
has_many :votes, Aggiedit.Post.Vote
has_many :comments, Aggiedit.Post.Comment
timestamps()
end
@doc """
A user changeset for registration.
It is important to validate the length of both email and password.
Otherwise databases may truncate the email without warnings, which
could lead to unpredictable or insecure behaviour. Long passwords may
also be very expensive to hash for certain algorithms.
## Options
* `:hash_password` - Hashes the password so it can be stored securely
in the database and ensures the password field is cleared to prevent
leaks in the logs. If password hashing is not needed and clearing the
password field is not desired (like when using this changeset for
validations on a LiveView form), this option can be set to `false`.
Defaults to `true`.
"""
def registration_changeset(user, attrs, opts \\ []) do
user
|> cast(attrs, [:username, :email, :password])
|> validate_username()
|> validate_email()
|> validate_password(opts)
end
defp validate_username(changeset) do
changeset
|> validate_required([:username])
|> validate_format(:username, ~r/^[a-z0-9_\-]*$/, message: "only lowercase letters, numbers, underscores, and hyphens allowed")
|> unique_constraint(:username)
end
defp validate_email(changeset) do
changeset
|> validate_required([:email])
|> validate_format(:email, ~r/^[^\s]+@[^\s]+\.[^\s]+$/, message: "must have the @ sign, no spaces, and a domain")
|> validate_length(:email, max: 160)
|> unsafe_validate_unique(:email, Aggiedit.Repo)
|> unique_constraint(:email)
end
defp validate_password(changeset, opts) do
changeset
|> validate_required([:password])
|> validate_length(:password, min: 8, max: 72)
# |> validate_format(:password, ~r/[a-z]/, message: "at least one lower case character")
# |> validate_format(:password, ~r/[A-Z]/, message: "at least one upper case character")
# |> validate_format(:password, ~r/[!?@#$%^&*_0-9]/, message: "at least one digit or punctuation character")
|> maybe_hash_password(opts)
end
defp maybe_hash_password(changeset, opts) do
hash_password? = Keyword.get(opts, :hash_password, true)
password = get_change(changeset, :password)
if hash_password? && password && changeset.valid? do
changeset
# If using Bcrypt, then further validate it is at most 72 bytes long
|> validate_length(:password, max: 72, count: :bytes)
|> put_change(:hashed_password, Bcrypt.hash_pwd_salt(password))
|> delete_change(:password)
else
changeset
end
end
@doc """
A user changeset for changing the email. It requires the email to change otherwise an error is added.
"""
def email_changeset(user, attrs) do
user
|> cast(attrs, [:email])
|> validate_email()
|> case do
%{changes: %{email: _}} = changeset -> changeset
%{} = changeset -> add_error(changeset, :email, "did not change")
end
end
@doc """
A user changeset for changing the password.
## Options
* `:hash_password` - Hashes the password so it can be stored securely
in the database and ensures the password field is cleared to prevent
leaks in the logs. If password hashing is not needed and clearing the
password field is not desired (like when using this changeset for
validations on a LiveView form), this option can be set to `false`.
Defaults to `true`.
"""
def password_changeset(user, attrs, opts \\ []) do
user
|> cast(attrs, [:password])
|> validate_confirmation(:password, message: "does not match password")
|> validate_password(opts)
end
@doc """
Confirms the account by setting `confirmed_at`.
"""
def confirm_changeset(user) do
now = NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
change(user, confirmed_at: now)
end
def room_changeset(user, room) do
change(user)
|> cast(%{:room_id => room.id}, [:room_id])
end
@doc """
Verifies the password.
If there is no user or the user doesn't have a password, we call
`Bcrypt.no_user_verify/0` to avoid timing attacks.
"""
def valid_password?(%Aggiedit.Accounts.User{hashed_password: hashed_password}, password)
when is_binary(hashed_password) and byte_size(password) > 0 do
Bcrypt.verify_pass(password, hashed_password)
end
def valid_password?(_, _) do
Bcrypt.no_user_verify()
false
end
@doc """
Validates the current password otherwise adds an error to the changeset.
"""
def validate_current_password(changeset, password) do
if valid_password?(changeset.data, password) do
changeset
else
add_error(changeset, :current_password, "is not valid")
end
end
end