Mellon
======
[](https://travis-ci.org/sajmoon/mellon)
An authentication module for Plug applications.
## Intallation
```elixir
defp deps do
[{:mellon, github: "sajmoon/mellon"}]
end
```
## How to use
See /examples for a working example.
```elixir
defmodule MyApp do
import Plug.Conn
use Plug.Builder
plug Mellon, validator: {MyApp, :validate, []}, header: "X-AUTH"
plug :index
def validate({conn, token}) do
case token do
"ValidToken" -> {:ok, {"userdata"}, conn}
_ -> {:error, [], conn}
end
def index(conn, _opts) do
send_resp(conn, 200, "Secure area")
end
end
```
To authenticated for this example using curl you might do the following:
```bash
curl --header "X-AUTH: Token: ValidToken" localhost:4000/hello
```
## Configuration
You can configure some parameters while initializing Mellon.
**Required**
`validator`: The function that validates the token. Must return {:ok, userdata, conn} if valid and {:error, conn} if not.
**Optional**
`header`: The http header used for tokens. Will default to 'Authorization'.
## Return object from validator
The validator can return some options.
All requests that are authenticated should return
```
{:ok, cargo, conn}
```
cargo can be any object that you would like to pass along. it will be assigned to the request so you can access it later in your controller.
It will be assigned to `:credentials`. To access it later you could do the following: `conn.assigns[:credentials]`.
If authentication fails you should return `{:error, options, conn}`.
Where options is a `Keyword` containing `status:` and `message`.
Both are optional.
In case you want a custom Unauthenticated message include `[message: 'Get out of here!']`
