Oauth/token (#7)

* add host and protocol options

* some fiddling

* tidying up and comments

* tick off /oauth/token

* tidying a bit

* tidying

* go mod tidy

* allow attaching middleware to server

* add middleware

* more user friendly

* add comments

* comments

* store account + app

* tidying

* lots of restructuring

* lint + tidy

internal/module/module.go

@@ -0,0 +1,29 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// Package module is basically a wrapper for a lot of modules (in subdirectories) that satisfy the ClientAPIModule interface.
+package module
+
+import "github.com/gotosocial/gotosocial/internal/router"
+
+// ClientAPIModule represents a chunk of code (usually contained in a single package) that adds a set
+// of functionalities and side effects to a router, by mapping routes and handlers onto it--in other words, a REST API ;)
+// A ClientAPIMpdule corresponds roughly to one main path of the gotosocial REST api, for example /api/v1/accounts/ or /oauth/
+type ClientAPIModule interface {
+	Route(s router.Router) error
+}