Move macaron to chi (#14293)

Use [chi](https://github.com/go-chi/chi) instead of the forked [macaron](https://gitea.com/macaron/macaron). Since macaron and chi have conflicts with session share, this big PR becomes a have-to thing. According my previous idea, we can replace macaron step by step but I'm wrong. :( Below is a list of big changes on this PR.

- [x] Define `context.ResponseWriter` interface with an implementation `context.Response`.
- [x] Use chi instead of macaron, and also a customize `Route` to wrap chi so that the router usage is similar as before.
- [x] Create different routers for `web`, `api`, `internal` and `install` so that the codes will be more clear and no magic .
- [x] Use https://github.com/unrolled/render instead of macaron's internal render
- [x] Use https://github.com/NYTimes/gziphandler instead of https://gitea.com/macaron/gzip
- [x] Use https://gitea.com/go-chi/session which is a modified version of https://gitea.com/macaron/session and removed `nodb` support since it will not be maintained. **BREAK**
- [x] Use https://gitea.com/go-chi/captcha which is a modified version of https://gitea.com/macaron/captcha
- [x] Use https://gitea.com/go-chi/cache which is a modified version of https://gitea.com/macaron/cache
- [x] Use https://gitea.com/go-chi/binding which is a modified version of https://gitea.com/macaron/binding
- [x] Use https://github.com/go-chi/cors instead of https://gitea.com/macaron/cors
- [x] Dropped https://gitea.com/macaron/i18n and make a new one in `code.gitea.io/gitea/modules/translation`
- [x] Move validation form structs from `code.gitea.io/gitea/modules/auth` to `code.gitea.io/gitea/modules/forms` to avoid dependency cycle.
- [x] Removed macaron log service because it's not need any more. **BREAK**
- [x] All form structs have to be get by `web.GetForm(ctx)` in the route function but not as a function parameter on routes definition.
- [x] Move Git HTTP protocol implementation to use routers directly.
- [x] Fix the problem that chi routes don't support trailing slash but macaron did.
- [x] `/api/v1/swagger` now will be redirect to `/api/swagger` but not render directly so that `APIContext` will not create a html render. 

Notices:
- Chi router don't support request with trailing slash
- Integration test `TestUserHeatmap` maybe mysql version related. It's failed on my macOS(mysql 5.7.29 installed via brew) but succeed on CI.

Co-authored-by: 6543 <6543@obermui.de>

routers/routes/install.go

@@ -0,0 +1,116 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package routes
+
+import (
+	"fmt"
+	"net/http"
+	"path"
+
+	"code.gitea.io/gitea/modules/forms"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/middlewares"
+	"code.gitea.io/gitea/modules/public"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/templates"
+	"code.gitea.io/gitea/modules/web"
+	"code.gitea.io/gitea/routers"
+
+	"gitea.com/go-chi/session"
+)
+
+func installRecovery() func(next http.Handler) http.Handler {
+	var rnd = templates.HTMLRenderer()
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			defer func() {
+				// Why we need this? The first recover will try to render a beautiful
+				// error page for user, but the process can still panic again, then
+				// we have to just recover twice and send a simple error page that
+				// should not panic any more.
+				defer func() {
+					if err := recover(); err != nil {
+						combinedErr := fmt.Sprintf("PANIC: %v\n%s", err, string(log.Stack(2)))
+						log.Error(combinedErr)
+						if setting.IsProd() {
+							http.Error(w, http.StatusText(500), 500)
+						} else {
+							http.Error(w, combinedErr, 500)
+						}
+					}
+				}()
+
+				if err := recover(); err != nil {
+					combinedErr := fmt.Sprintf("PANIC: %v\n%s", err, string(log.Stack(2)))
+					log.Error("%v", combinedErr)
+
+					lc := middlewares.Locale(w, req)
+					var store = dataStore{
+						Data: templates.Vars{
+							"Language":       lc.Language(),
+							"CurrentURL":     setting.AppSubURL + req.URL.RequestURI(),
+							"i18n":           lc,
+							"SignedUserID":   int64(0),
+							"SignedUserName": "",
+						},
+					}
+
+					w.Header().Set(`X-Frame-Options`, `SAMEORIGIN`)
+
+					if !setting.IsProd() {
+						store.Data["ErrorMsg"] = combinedErr
+					}
+					err = rnd.HTML(w, 500, "status/500", templates.BaseVars().Merge(store.Data))
+					if err != nil {
+						log.Error("%v", err)
+					}
+				}
+			}()
+
+			next.ServeHTTP(w, req)
+		})
+	}
+}
+
+// InstallRoutes registers the install routes
+func InstallRoutes() *web.Route {
+	r := web.NewRoute()
+	for _, middle := range commonMiddlewares() {
+		r.Use(middle)
+	}
+
+	r.Use(session.Sessioner(session.Options{
+		Provider:       setting.SessionConfig.Provider,
+		ProviderConfig: setting.SessionConfig.ProviderConfig,
+		CookieName:     setting.SessionConfig.CookieName,
+		CookiePath:     setting.SessionConfig.CookiePath,
+		Gclifetime:     setting.SessionConfig.Gclifetime,
+		Maxlifetime:    setting.SessionConfig.Maxlifetime,
+		Secure:         setting.SessionConfig.Secure,
+		Domain:         setting.SessionConfig.Domain,
+	}))
+
+	r.Use(installRecovery())
+
+	r.Use(public.Custom(
+		&public.Options{
+			SkipLogging: setting.DisableRouterLog,
+		},
+	))
+	r.Use(public.Static(
+		&public.Options{
+			Directory:   path.Join(setting.StaticRootPath, "public"),
+			SkipLogging: setting.DisableRouterLog,
+		},
+	))
+
+	r.Use(routers.InstallInit)
+	r.Get("/", routers.Install)
+	r.Post("/", web.Bind(forms.InstallForm{}), routers.InstallPost)
+	r.NotFound(func(w http.ResponseWriter, req *http.Request) {
+		http.Redirect(w, req, setting.AppURL, 302)
+	})
+	return r
+}