# CoherenceAssent
[](https://travis-ci.org/danschultzer/coherence_assent)
Use Google, Github, Twitter, Facebook, Basecamp, VK or add your own strategy for authorization to your Coherence Phoenix app.
## Features
* Collects required login field if missing verified email from provider
* Multiple providers can be used for accounts
* When removing auth: Validates user has password or another provider authentication
* Github, Google, Twitter, Facebook, Basecamp and VK strategies included
* Updates Coherence templates automatically
* You can add your custom strategy with ease
## Installation
**Note:** This version requires Coherence v0.5. If you get dependency resolution failure with ecto when you install Coherence or coherence_assent, just run `mix deps.unlock ecto`.
Add CoherenceAssent to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
# ...
{:coherence_assent, "~> 0.2"}
# ...
]
end
```
Run `mix deps.get` to install it.
## Set up Coherence
You need to make sure the Coherence views and routes has been set up first. If this hasn't been done, follow the next steps.
Add all the Coherence files to your project:
```
mix coh.install --full --confirmable --invitable
```
Update routes:
```elixir
# lib/my_project_web/router.ex
defmodule MyProjectWeb.Router do
use MyProjectWeb, :router
use Coherence.Router # Add this
pipeline :browser do
plug :accepts, ["html"]
plug :fetch_session
plug :fetch_flash
plug :protect_from_forgery
plug :put_secure_browser_headers
plug Coherence.Authentication.Session # Add this
end
# Add this block
pipeline :protected do
plug :accepts, ["html"]
plug :fetch_session
plug :fetch_flash
plug :protect_from_forgery
plug :put_secure_browser_headers
plug Coherence.Authentication.Session, protected: true
end
# ...
# Add this block
scope "/" do
pipe_through :browser
coherence_routes()
end
# Add this block
scope "/" do
pipe_through :protected
coherence_routes :protected
end
# ...
end
```
## Getting started
Run to update all Coherence files:
```bash
mix coherence_assent.install
```
The install script will attempt to update the following files that Coherence have installed:
```
LIB_PATH/coherence/user.ex
WEB_PATH/templates/coherence/edit.html.eex
WEB_PATH/templates/coherence/new.html.eex
WEB_PATH/views/coherence/coherence_view_helpers.ex
WEB_PATH/coherence_messages.ex
```
If the files cannot be updated, install instructions will be printed instead. It's important that you update all files according to these instructions.
Set up routes:
```elixir
# lib/my_project_web/router.ex
defmodule MyAppWeb.Router do
use MyAppWeb, :router
use Coherence.Router
use CoherenceAssent.Router # Add this
# ...
scope "/" do
pipe_through [:browser]
coherence_routes()
coherence_assent_routes() # Add this
end
# ...
end
```
The following routes will now be available in your app:
```
coherence_assent_auth_path GET /auth/:provider CoherenceAssent.AuthorizationController :new
coherence_assent_auth_path GET /auth/:provider/callback CoherenceAssent.AuthorizationController :create
coherence_assent_registration_path GET /auth/:provider/new CoherenceAssent.RegistrationController :add_login_field
coherence_assent_registration_path GET /auth/:provider/create CoherenceAssent.RegistrationController :create
```
Remember to run the new migrations: `mix ecto.setup`
## Setting up a provider
Strategies for Twitter, Facebook, Google, Github and Basecamp are included. We'll go through how to set up the Github strategy.
First, register [a new app on Github](https://github.com/settings/applications/new) and add "http://localhost:4000/auth/github/callback" as callback URL. Then add the following to `config/config.exs` and add the client id and client secret:
```elixir
config :coherence_assent, :providers,
[
github: [
client_id: "REPLACE_WITH_CLIENT_ID",
client_secret: "REPLACE_WITH_CLIENT_SECRET",
strategy: CoherenceAssent.Strategy.Github
]
]
```
Now start (or restart) your Phoenix app, and visit `http://localhost:4000/registrations/new`. You'll see a "Sign in with Github" link.
## Custom provider
You can add your own strategy. Here's an example of an OAuth 2.0 implementation:
```elixir
defmodule TestProvider do
alias CoherenceAssent.Strategy.Helpers
alias CoherenceAssent.Strategies.OAuth2, as: OAuth2Helper
def authorize_url(conn, config) do
OAuth2Helper.authorize_url(conn, set_config(config))
end
def callback(conn, config, params) do
config = set_config(config)
conn
|> OAuth2Helper.callback(config, params)
|> normalize
end
defp set_config(config) do
[
site: "http://localhost:4000/",
authorize_url: "http://localhost:4000/oauth/authorize",
token_url: "http://localhost:4000/oauth/access_token",
user_url: "/user",
authorization_params: [scope: "email profile"]
]
|> Keyword.merge(config)
|> Keyword.put(:strategy, OAuth2.Strategy.AuthCode)
end
defp normalize({:ok, %{conn: conn, client: client, user: user}}) do
user = %{"uid" => user["sub"],
"name" => user["name"],
"email" => user["email"]}
|> Helpers.prune
{:ok, %{conn: conn, client: client, user: user}}
end
defp normalize({:error, _} = error), do: error
end
```
## Security concerns
All sessions created through `CoherenceAssent` provider authentication are temporary, and doesn't use the `rememberable` configuration in Coherence. However, it's a good idea to do some housekeeping in your app and making sure that you have the level of security as warranted by the scope of your app. This may include requiring users to reauthenticate before viewing or editing their user details.
## LICENSE
(The MIT License)
Copyright (c) 2017 Dan Schultzer & the Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
