Make OAuth token endpoint work with HTTP Basic auth
client_id/client_secret can now be supplied in an Authorization header
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@ -56,12 +56,7 @@ def create_authorization(conn, %{
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# TODO
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# - proper scope handling
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def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
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with %App{} = app <-
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Repo.get_by(
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App,
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client_id: params["client_id"],
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client_secret: params["client_secret"]
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),
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with %App{} = app <- get_app_from_request(conn, params),
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fixed_token = fix_padding(params["code"]),
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%Authorization{} = auth <-
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Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
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@ -86,12 +81,7 @@ def token_exchange(
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conn,
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%{"grant_type" => "password", "name" => name, "password" => password} = params
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) do
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with %App{} = app <-
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Repo.get_by(
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App,
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client_id: params["client_id"],
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client_secret: params["client_secret"]
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),
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with %App{} = app <- get_app_from_request(conn, params),
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%User{} = user <- User.get_cached_by_nickname(name),
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true <- Pbkdf2.checkpw(password, user.password_hash),
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{:ok, auth} <- Authorization.create_authorization(app, user),
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@ -115,4 +105,28 @@ defp fix_padding(token) do
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|> Base.url_decode64!(padding: false)
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|> Base.url_encode64()
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end
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defp get_app_from_request(conn, params) do
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# Per RFC 6749, HTTP Basic is preferred to body params
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{client_id, client_secret} =
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with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
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{:ok, decoded} <- Base.decode64(encoded),
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[id, secret] <-
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String.split(decoded, ":")
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|> Enum.map(fn s -> URI.decode_www_form(s) end) do
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{id, secret}
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else
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_ -> {params["client_id"], params["client_secret"]}
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end
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if client_id && client_secret do
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Repo.get_by(
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App,
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client_id: client_id,
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client_secret: client_secret
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)
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else
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nil
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end
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end
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end
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