Yesod.Auth.Email

A Yesod plugin for Authentication via e-mail

This plugin works out of the box by only setting a few methods on the type class that tell the plugin how to interoperate with your user data storage (your database). However, almost everything is customizeable by setting more methods on the type class. In addition, you can send all the form submissions via JSON and completely control the user's flow.

This is a standard registration e-mail flow

1. A user registers a new e-mail address, and an e-mail is sent there
2. The user clicks on the registration link in the e-mail. Note that at this point they are actually logged in (without a password). That means that when they log out they will need to reset their password.
3. The user sets their password and is redirected to the site.

4. The user can now

   • logout and sign in
   • reset their password

Using JSON Endpoints

We are assuming that you have declared auth route as follows

   /auth AuthR Auth getAuth

If you are using a different route, then you have to adjust the endpoints accordingly.

• Registration

      Endpoint: /auth/page/email/register
      Method: POST
      JSON Data: {
                     "email": "[e-mail]",
                     "password": "myStrongPassword" (optional)
                 }

• Forgot password

      Endpoint: /auth/page/email/forgot-password
      Method: POST
      JSON Data: { "email": "[e-mail]" }

• Login

      Endpoint: /auth/page/email/login
      Method: POST
      JSON Data: { 
                     "email": "[e-mail]",
                     "password": "myStrongPassword"
                 }

• Set new password

      Endpoint: /auth/page/email/set-password
      Method: POST
      JSON Data: {
                      "new": "newPassword",
                      "confirm": "newPassword",
                      "current": "currentPassword"
                 }

Note that in the set password endpoint, the presence of the key "current" is dependent on how the needOldPassword is defined in the instance for YesodAuthEmail.

Plugin

authEmail :: YesodAuthEmail m => AuthPlugin m

class (YesodAuth site, PathPiece (AuthEmailId site), RenderMessage site AuthMessage) => YesodAuthEmail site where

Minimal complete definition

addUnverified, sendVerifyEmail, getVerifyKey, setVerifyKey, verifyAccount, getPassword, setPassword, getEmailCreds, getEmail, afterPasswordRoute

Associated Types

type AuthEmailId site

Methods

addUnverified :: Email -> VerKey -> AuthHandler site (AuthEmailId site)

Add a new email address to the database, but indicate that the address has not yet been verified.

Since: 1.1.0

addUnverifiedWithPass :: Email -> VerKey -> SaltedPass -> AuthHandler site (AuthEmailId site)

Similar to addUnverified, but comes with the registered password.

The default implementation is just addUnverified, which ignores the password.

You may override this to save the salted password to your database.

Since: 1.6.4

sendVerifyEmail :: Email -> VerKey -> VerUrl -> AuthHandler site ()

Send an email to the given address to verify ownership.

Since: 1.1.0

sendForgotPasswordEmail :: Email -> VerKey -> VerUrl -> AuthHandler site ()

Send an email to the given address to re-verify ownership in the case of a password reset. This can be used to send a different email when a user goes through the 'forgot password' flow as opposed to the 'account registration' flow.

Default: Will call sendVerifyEmail, resulting in the same email getting sent for both registrations and password resets.

Since: 1.6.10

getVerifyKey :: AuthEmailId site -> AuthHandler site (Maybe VerKey)

Get the verification key for the given email ID.

Since: 1.1.0

setVerifyKey :: AuthEmailId site -> VerKey -> AuthHandler site ()

Set the verification key for the given email ID.

Since: 1.1.0

hashAndSaltPassword :: Text -> AuthHandler site SaltedPass

Hash and salt a password

Default: saltPass.

Since: 1.4.20

verifyPassword :: Text -> SaltedPass -> AuthHandler site Bool

Verify a password matches the stored password for the given account.

Default: Fetch a password with getPassword and match using verifyPassword.

Since: 1.4.20

verifyAccount :: AuthEmailId site -> AuthHandler site (Maybe (AuthId site))

Verify the email address on the given account.

Warning! If you have persisted the AuthEmailId site somewhere, this method should delete that key, or make it unusable in some fashion. Otherwise, the same key can be used multiple times!

See https://github.com/yesodweb/yesod/issues/1222.

Since: 1.1.0

getPassword :: AuthId site -> AuthHandler site (Maybe SaltedPass)

Get the salted password for the given account.

Since: 1.1.0

setPassword :: AuthId site -> SaltedPass -> AuthHandler site ()

Set the salted password for the given account.

Since: 1.1.0

getEmailCreds :: Identifier -> AuthHandler site (Maybe (EmailCreds site))

Get the credentials for the given Identifier, which may be either an email address or some other identification (e.g., username).

Since: 1.2.0

getEmail :: AuthEmailId site -> AuthHandler site (Maybe Email)

Get the email address for the given email ID.

Since: 1.1.0

randomKey :: site -> IO VerKey

Generate a random alphanumeric string.

Since: 1.1.0

afterPasswordRoute :: site -> Route site

Route to send user to after password has been set correctly.

Since: 1.2.0

afterVerificationWithPass :: site -> Route site

Route to send user to after verification with a password

Since: 1.6.4

needOldPassword :: AuthId site -> AuthHandler site Bool

Does the user need to provide the current password in order to set a new password?

Default: if the user logged in via an email link do not require a password.

Since: 1.2.1

checkPasswordSecurity :: AuthId site -> Text -> AuthHandler site (Either Text ())

Check that the given plain-text password meets minimum security standards.

Default: password is at least three characters.

confirmationEmailSentResponse :: Text -> AuthHandler site TypedContent

Response after sending a confirmation email.

Since: 1.2.2

emailPreviouslyRegisteredResponse :: MonadAuthHandler site m => Text -> Maybe (m TypedContent)

If a response is set, it will be used when an already-verified email tries to re-register. Otherwise, confirmationEmailSentResponse will be used.

Since: 1.6.4

normalizeEmailAddress :: site -> Text -> Text

Additional normalization of email addresses, besides standard canonicalization.

Default: Lower case the email address.

Since: 1.2.3

emailLoginHandler :: (Route Auth -> Route site) -> WidgetFor site ()

Handler called to render the login page. The default works fine, but you may want to override it in order to have a different DOM.

Default: defaultEmailLoginHandler.

Since: 1.4.17

registerHandler :: AuthHandler site Html

Handler called to render the registration page. The default works fine, but you may want to override it in order to have a different DOM.

Default: defaultRegisterHandler.

@since: 1.2.6

forgotPasswordHandler :: AuthHandler site Html

Handler called to render the "forgot password" page. The default works fine, but you may want to override it in order to have a different DOM.

Default: defaultForgotPasswordHandler.

@since: 1.2.6

setPasswordHandler

Arguments

:: Bool

Whether the old password is needed. If True, a field for the old password should be presented. Otherwise, just two fields for the new password are needed.

-> AuthHandler site TypedContent

Handler called to render the "set password" page. The default works fine, but you may want to override it in order to have a different DOM.

Default: defaultSetPasswordHandler.

@since: 1.2.6

registerHelper

Arguments

:: Route Auth

Where to sent the user in the event that registration fails

-> AuthHandler site TypedContent

Helper that controls what happens after a user registration request is submitted. This method can be overridden to completely customize what happens during the user registration process, such as for handling additional fields in the registration form.

The default implementation is in terms of defaultRegisterHelper.

@since: 1.6.9

passwordResetHelper

Arguments

:: Route Auth

Where to sent the user in the event that the password reset fails

-> AuthHandler site TypedContent

Helper that controls what happens after a forgot password request is submitted. As with registerHelper, this method can be overridden to customize the behavior when a user attempts to recover their password.

The default implementation is in terms of defaultRegisterHelper.

@since: 1.6.9

data EmailCreds site

Data stored in a database for each e-mail address.

Constructors

EmailCreds

Fields

• emailCredsId :: AuthEmailId site
• emailCredsAuthId :: Maybe (AuthId site)
• emailCredsStatus :: VerStatus
• emailCredsVerkey :: Maybe VerKey
• emailCredsEmail :: Email

saltPass :: Text -> IO Text

Salt a password with a randomly generated salt.

Routes

loginR :: AuthRoute

registerR :: AuthRoute

forgotPasswordR :: AuthRoute

setpassR :: AuthRoute

verifyR :: Text -> Text -> Bool -> AuthRoute

Since: 1.4.5

isValidPass

Arguments

:: Text

cleartext password

-> SaltedPass

salted password

-> Bool

Types

type Email = Text

type VerKey = Text

type VerUrl = Text

type SaltedPass = Text

type VerStatus = Bool

type Identifier = Text

An Identifier generalizes an email address to allow users to log in with some other form of credentials (e.g., username).

Note that any of these other identifiers must not be valid email addresses.

Since: 1.2.0

Misc

loginLinkKey :: Text

Session variable set when user logged in via a login link. See needOldPassword.

Since: 1.2.1

setLoginLinkKey :: (MonadHandler m, YesodAuthEmail (HandlerSite m)) => AuthId (HandlerSite m) -> m ()

Set loginLinkKey to the current time.

setLoginLinkKey :: (MonadHandler m) => AuthId site -> m ()

Since: 1.2.1

Default handlers

defaultEmailLoginHandler :: YesodAuthEmail master => (Route Auth -> Route master) -> WidgetFor master ()

Default implementation of emailLoginHandler.

Since: 1.4.17

defaultRegisterHandler :: YesodAuthEmail master => AuthHandler master Html

Default implementation of registerHandler.

Since: 1.2.6

defaultForgotPasswordHandler :: YesodAuthEmail master => AuthHandler master Html

Default implementation of forgotPasswordHandler.

Since: 1.2.6

defaultSetPasswordHandler :: YesodAuthEmail master => Bool -> AuthHandler master TypedContent

Default implementation of setPasswordHandler.

Since: 1.2.6

Default helpers

defaultRegisterHelper

Arguments

:: YesodAuthEmail master

=> Bool

Allow lookup via username in addition to email

-> Bool

Set to True for forgot password flow, False for new account registration

-> Route Auth

-> AuthHandler master TypedContent