124 lines
3.2 KiB
Elixir
124 lines
3.2 KiB
Elixir
defmodule Ueberauth.Strategy.Twitter do
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@moduledoc """
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Twitter Strategy for Überauth.
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"""
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use Ueberauth.Strategy, uid_field: :id_str
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alias Ueberauth.Auth.Info
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alias Ueberauth.Auth.Credentials
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alias Ueberauth.Auth.Extra
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alias Ueberauth.Strategy.Twitter
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@doc """
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Handles initial request for Twitter authentication.
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"""
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def handle_request!(conn) do
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token = Twitter.OAuth.request_token!([], [redirect_uri: callback_url(conn)])
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conn
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|> put_session(:twitter_token, token)
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|> redirect!(Twitter.OAuth.authorize_url!(token))
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end
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@doc """
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Handles the callback from Twitter.
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"""
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def handle_callback!(%Plug.Conn{params: %{"oauth_verifier" => oauth_verifier}} = conn) do
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token = get_session(conn, :twitter_token)
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case Twitter.OAuth.access_token(token, oauth_verifier) do
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{:ok, access_token} -> fetch_user(conn, access_token)
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{:error, error} -> set_errors!(conn, [error(error.code, error.reason)])
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end
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end
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@doc false
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def handle_callback!(conn) do
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set_errors!(conn, [error("missing_code", "No code received")])
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end
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@doc false
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def handle_cleanup!(conn) do
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conn
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|> put_private(:twitter_user, nil)
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|> put_session(:twitter_token, nil)
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end
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@doc """
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Fetches the uid field from the response.
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"""
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def uid(conn) do
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uid_field =
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conn
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|> option(:uid_field)
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|> to_string
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conn.private.twitter_user[uid_field]
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end
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@doc """
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Includes the credentials from the twitter response.
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"""
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def credentials(conn) do
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{token, _secret} = get_session(conn, :twitter_token
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%Credentials{token: token}
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end
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@doc """
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Fetches the fields to populate the info section of the `Ueberauth.Auth` struct.
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"""
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def info(conn) do
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user = conn.private.twitter_user
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%Info{
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email: user["email"],
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image: user["profile_image_url"],
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name: user["name"],
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nickname: user["screen_name"],
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description: user["description"],
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urls: %{
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Twitter: "https://twitter.com/#{user["screen_name"]}",
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Website: user["url"]
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}
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}
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end
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@doc """
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Stores the raw information (including the token) obtained from the twitter callback.
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"""
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def extra(conn) do
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{token, _secret} = get_session(conn, :twitter_token)
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%Extra{
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raw_info: %{
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token: token,
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user: conn.private.twitter_user
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}
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}
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end
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defp fetch_user(conn, token) do
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params = [include_entities: false, skip_status: true, include_email: true]
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case Twitter.OAuth.get("/1.1/account/verify_credentials.json", params, token) do
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{:ok, {{_, 401, _}, _, _}} ->
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set_errors!(conn, [error("token", "unauthorized")])
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{:ok, {{_, status_code, _}, _, body}} when status_code in 200..399 ->
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body = body |> List.to_string |> Poison.decode!
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conn
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|> put_private(:twitter_token, token)
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|> put_private(:twitter_user, body)
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{:ok, {_, _, body}} ->
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body = body |> List.to_string |> Poison.decode!
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error = List.first(body["errors"])
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set_errors!(conn, [error("token", error["message"])])
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end
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end
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defp option(conn, key) do
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Dict.get(options(conn), key, Dict.get(default_options, key))
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end
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end
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