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# DSL: AshAuthentication.Strategy.Auth0
Strategy for authenticating using [Auth0](https://auth0.com).
This strategy builds on-top of `AshAuthentication.Strategy.OAuth2` and
[`assent`](https://hex.pm/packages/assent).
In order to use Auth0 you need to provide the following minimum configuration:
- `client_id`
- `redirect_uri`
- `client_secret`
- `site`
## More documentation:
- The [Auth0 Tutorial](/documentation/tutorial/auth0.md).
- The [OAuth2 documentation](`AshAuthentication.Strategy.OAuth2`)
## authentication.strategies.auth0
```elixir
auth0 name \\ :auth0
```
Provides a pre-configured authentication strategy for [Auth0](https://auth0.com/).
This strategy is built using the `:oauth2` strategy, and thus provides all the same
configuration options should you need them.
###### More documentation:
- The [Auth0 Tutorial](/documentation/tutorial/auth0.md).
- The [OAuth2 documentation](`AshAuthentication.Strategy.OAuth2`)
###### Strategy defaults:
The following defaults are applied:
* `:authorize_url` is set to `"/authorize"`.
* `:token_url` is set to `"/oauth/token"`.
* `:user_url` is set to `"/userinfo"`.
* `:authorization_params` is set to `[scope: "openid profile email"]`.
* `:auth_method` is set to `:client_secret_post`.
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#authentication-strategies-auth0-name){: #authentication-strategies-auth0-name .spark-required} | `atom` | | Uniquely identifies the strategy. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`client_id`](#authentication-strategies-auth0-client_id){: #authentication-strategies-auth0-client_id .spark-required} | `(any, any -> any) \| module \| String.t` | | The OAuth2 client ID. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`redirect_uri`](#authentication-strategies-auth0-redirect_uri){: #authentication-strategies-auth0-redirect_uri .spark-required} | `(any, any -> any) \| module \| String.t` | | The callback URI *base*. Not the whole URI back to the callback endpoint, but the URI to your `AuthPlug`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`base_url`](#authentication-strategies-auth0-base_url){: #authentication-strategies-auth0-base_url } | `(any, any -> any) \| module \| String.t` | | The base URL of the OAuth2 server - including the leading protocol (ie `https://`). Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`site`](#authentication-strategies-auth0-site){: #authentication-strategies-auth0-site } | `(any, any -> any) \| module \| String.t` | | Deprecated: Use `base_url` instead. |
| [`auth_method`](#authentication-strategies-auth0-auth_method){: #authentication-strategies-auth0-auth_method } | `nil \| :client_secret_basic \| :client_secret_post \| :client_secret_jwt \| :private_key_jwt` | `:client_secret_post` | The authentication strategy used, optional. If not set, no authentication will be used during the access token request. |
| [`client_secret`](#authentication-strategies-auth0-client_secret){: #authentication-strategies-auth0-client_secret } | `(any, any -> any) \| module \| String.t` | | The OAuth2 client secret. Required if :auth_method is `:client_secret_basic`, `:client_secret_post` or `:client_secret_jwt`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`authorize_url`](#authentication-strategies-auth0-authorize_url){: #authentication-strategies-auth0-authorize_url } | `(any, any -> any) \| module \| String.t` | `"/authorize"` | The API url to the OAuth2 authorize endpoint, relative to `site`, e.g `authorize_url fn _, _ -> {:ok, "https://exampe.com/authorize"} end`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`token_url`](#authentication-strategies-auth0-token_url){: #authentication-strategies-auth0-token_url } | `(any, any -> any) \| module \| String.t` | `"/oauth/token"` | The API url to access the token endpoint, relative to `site`, e.g `token_url fn _, _ -> {:ok, "https://example.com/oauth_token"} end`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`trusted_audiences`](#authentication-strategies-auth0-trusted_audiences){: #authentication-strategies-auth0-trusted_audiences } | `(any, any -> any) \| module \| list(any) \| nil` | | A list of audiences which are trusted. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`user_url`](#authentication-strategies-auth0-user_url){: #authentication-strategies-auth0-user_url } | `(any, any -> any) \| module \| String.t` | `"/userinfo"` | The API url to access the user endpoint, relative to `site`, e.g `user_url fn _, _ -> {:ok, "https://example.com/userinfo"} end`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`private_key`](#authentication-strategies-auth0-private_key){: #authentication-strategies-auth0-private_key } | `(any, any -> any) \| module \| String.t` | | The private key to use if `:auth_method` is `:private_key_jwt`. Takes either a module which implements the `AshAuthentication.Secret` behaviour, a 2 arity anonymous function or a string. |
| [`authorization_params`](#authentication-strategies-auth0-authorization_params){: #authentication-strategies-auth0-authorization_params } | `keyword` | `[scope: "openid profile email"]` | Any additional parameters to encode in the request phase. eg: `authorization_params scope: "openid profile email"` |
| [`registration_enabled?`](#authentication-strategies-auth0-registration_enabled?){: #authentication-strategies-auth0-registration_enabled? } | `boolean` | `true` | If enabled, new users will be able to register for your site when authenticating and not already present. If not, only existing users will be able to authenticate. |
| [`register_action_name`](#authentication-strategies-auth0-register_action_name){: #authentication-strategies-auth0-register_action_name } | `atom` | | The name of the action to use to register a user, if `registration_enabled?` is `true`. Defaults to `register_with_<name>` See the "Registration and Sign-in" section of the strategy docs for more. |
| [`sign_in_action_name`](#authentication-strategies-auth0-sign_in_action_name){: #authentication-strategies-auth0-sign_in_action_name } | `atom` | | The name of the action to use to sign in an existing user, if `sign_in_enabled?` is `true`. Defaults to `sign_in_with_<strategy>`, which is generated for you by default. See the "Registration and Sign-in" section of the strategy docs for more information. |
| [`identity_resource`](#authentication-strategies-auth0-identity_resource){: #authentication-strategies-auth0-identity_resource } | `module \| false` | `false` | The resource used to store user identities, or `false` to disable. See the User Identities section of the strategy docs for more. |
| [`identity_relationship_name`](#authentication-strategies-auth0-identity_relationship_name){: #authentication-strategies-auth0-identity_relationship_name } | `atom` | `:identities` | Name of the relationship to the provider identities resource |
| [`identity_relationship_user_id_attribute`](#authentication-strategies-auth0-identity_relationship_user_id_attribute){: #authentication-strategies-auth0-identity_relationship_user_id_attribute } | `atom` | `:user_id` | The name of the destination (user_id) attribute on your provider identity resource. Only necessary if you've changed the `user_id_attribute_name` option of the provider identity. |
### Introspection
Target: `AshAuthentication.Strategy.OAuth2`
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