[chore] The Big Middleware and API Refactor (tm) (#1250)

* interim commit: start refactoring middlewares into package under router

* another interim commit, this is becoming a big job

* another fucking massive interim commit

* refactor bookmarks to new style

* ambassador, wiz zeze commits you are spoiling uz

* she compiles, we're getting there

* we're just normal men; we're just innocent men

* apiutil

* whoopsie

* i'm glad noone reads commit msgs haha :blob_sweat:

* use that weirdo go-bytesize library for maxMultipartMemory

* fix media module paths

internal/api/auth.go

@@ -0,0 +1,64 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 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 api
+
+import (
+	"github.com/superseriousbusiness/gotosocial/internal/api/auth"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/middleware"
+	"github.com/superseriousbusiness/gotosocial/internal/oidc"
+	"github.com/superseriousbusiness/gotosocial/internal/processing"
+	"github.com/superseriousbusiness/gotosocial/internal/router"
+)
+
+type Auth struct {
+	routerSession *gtsmodel.RouterSession
+	sessionName   string
+
+	auth *auth.Module
+}
+
+// Route attaches 'auth' and 'oauth' groups to the given router.
+func (a *Auth) Route(r router.Router) {
+	// create groupings for the 'auth' and 'oauth' prefixes
+	authGroup := r.AttachGroup("auth")
+	oauthGroup := r.AttachGroup("oauth")
+
+	// instantiate + attach shared, non-global middlewares to both of these groups
+	var (
+		rateLimitMiddleware    = middleware.RateLimit() // nolint:contextcheck
+		gzipMiddleware         = middleware.Gzip()
+		cacheControlMiddleware = middleware.CacheControl("private", "max-age=120")
+		sessionMiddleware      = middleware.Session(a.sessionName, a.routerSession.Auth, a.routerSession.Crypt)
+	)
+	authGroup.Use(rateLimitMiddleware, gzipMiddleware, cacheControlMiddleware, sessionMiddleware)
+	oauthGroup.Use(rateLimitMiddleware, gzipMiddleware, cacheControlMiddleware, sessionMiddleware)
+
+	a.auth.RouteAuth(authGroup.Handle)
+	a.auth.RouteOauth(oauthGroup.Handle)
+}
+
+func NewAuth(db db.DB, p processing.Processor, idp oidc.IDP, routerSession *gtsmodel.RouterSession, sessionName string) *Auth {
+	return &Auth{
+		routerSession: routerSession,
+		sessionName:   sessionName,
+		auth:          auth.New(db, p, idp),
+	}
+}