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docs: Add GitHub quick start guide. (#143)
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documentation/tutorials/github-quickstart.md
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documentation/tutorials/github-quickstart.md
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# GitHub Quick Start Guide
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This is a _very quick_ tutorial on how to configure your application to use
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GitHub for authentication.
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First you need to configure an application in your [GitHub developer
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settings](https://github.com/settings/developers):
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1. Click the "New OAuth App" button.
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2. Set your application name to something that identifies it. You will likely
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need separate applications for development and production environments, so
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keep that in mind.
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3. Set "Homepage URL" appropriately for your application and environment.
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4. In the "Authorization callback URL" section, add your callback URL. The
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callback URL is generated from the following information:
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- The base URL of the application - in development that would be
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`http://localhost:4000/` but in production will be your application's
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URL.
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- The mount point of the auth routes in your router - we'll assume
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`/auth`.
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- The "subject name" of the resource being authenticated - we'll assume `user`.
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- The name of the strategy in your configuration. By default this is
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`github`.
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This means that the callback URL should look something like
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`http://localhost:4000/auth/user/github/callback`.
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5. Do not set "Enable Device Flow" unless you know why you want this.
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6. Click "Register application".
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7. Click "Generate a new client secret".
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8. Copy the "Client ID" and "Client secret" somewhere safe, we'll need them
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soon.
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9. Click "Update application".
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Next we can configure our resource (assuming you already have everything else
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set up):
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```elixir
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defmodule MyApp.Accounts.User do
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use Ash.Resource, extensions: [AshAuthentication]
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authentication do
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github do
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client_id MyApp.Secrets
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redirect_uri MyApp.Secrets
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client_secret MyApp.Secrets
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end
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end
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end
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```
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Because all the configuration values should be kept secret (ie the
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`client_secret`) or are likely to be different for each environment we use the
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`AshAuthentication.Secret` behaviour to provide them. In this case we're
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delegating to the OTP application environment, however you may want to use a
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system environment variable or some other secret store (eg Vault).
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```elixir
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defmodule MyApp.Secrets do
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use AshAuthentication.Secret
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def secret_for([:authentication, :strategies, :github, :client_id], MyApp.Accounts.User, _) do
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get_config(:client_id)
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end
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def secret_for([:authentication, :strategies, :github, :redirect_uri], MyApp.Accounts.User, _) do
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get_config(:redirect_uri)
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end
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def secret_for([:authentication, :strategies, :github, :client_secret], MyApp.Accounts.User, _) do
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get_config(:client_secret)
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end
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defp get_config(key) do
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:my_app
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|> Application.get_env(:github, [])
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|> Keyword.fetch(key)
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end
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end
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```
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The values for this configuration should be:
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* `client_id` - the client ID copied from the GitHub settings page.
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* `redirect_uri` - the URL to the generated auth routes in your application
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(eg `http://localhost:4000/auth`).
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* `client_secret` the client secret copied from the GitHub settings page.
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@ -737,7 +737,20 @@ defmodule AshAuthentication.Dsl do
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|> Map.merge(%{
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name: :github,
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args: [{:optional, :name, :github}],
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describe: "GitHub authentication",
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describe: """
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Provides a pre-configured authentication strategy for [GitHub](https://github.com/).
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This strategy is built using `:oauth2` strategy, and thus provides all the same
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configuration options should you need them.
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For more information see the {{link:ash_authentication:guide:GitHub Quick Start Guide}} in our documentation.
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#### Strategy defaults:
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#{strategy_override_docs(Assent.Strategy.Github)}
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#### Schema:
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""",
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auto_set_fields: strategy_fields(Assent.Strategy.Github, icon: :github)
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})
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end
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