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/private/internal.go

@@ -6,47 +6,69 @@
 package private
 
 import (
+	"net/http"
+	"reflect"
 	"strings"
 
+	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/private"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/web"
 
-	"gitea.com/macaron/binding"
-	"gitea.com/macaron/macaron"
+	"gitea.com/go-chi/binding"
 )
 
 // CheckInternalToken check internal token is set
-func CheckInternalToken(ctx *macaron.Context) {
-	tokens := ctx.Req.Header.Get("Authorization")
-	fields := strings.Fields(tokens)
-	if len(fields) != 2 || fields[0] != "Bearer" || fields[1] != setting.InternalToken {
-		log.Debug("Forbidden attempt to access internal url: Authorization header: %s", tokens)
-		ctx.Error(403)
+func CheckInternalToken(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		tokens := req.Header.Get("Authorization")
+		fields := strings.Fields(tokens)
+		if len(fields) != 2 || fields[0] != "Bearer" || fields[1] != setting.InternalToken {
+			log.Debug("Forbidden attempt to access internal url: Authorization header: %s", tokens)
+			http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
+		} else {
+			next.ServeHTTP(w, req)
+		}
+	})
+}
+
+// bind binding an obj to a handler
+func bind(obj interface{}) http.HandlerFunc {
+	var tp = reflect.TypeOf(obj)
+	for tp.Kind() == reflect.Ptr {
+		tp = tp.Elem()
 	}
+	return web.Wrap(func(ctx *context.PrivateContext) {
+		var theObj = reflect.New(tp).Interface() // create a new form obj for every request but not use obj directly
+		binding.Bind(ctx.Req, theObj)
+		web.SetForm(ctx, theObj)
+	})
 }
 
-// RegisterRoutes registers all internal APIs routes to web application.
+// Routes registers all internal APIs routes to web application.
 // These APIs will be invoked by internal commands for example `gitea serv` and etc.
-func RegisterRoutes(m *macaron.Macaron) {
-	bind := binding.Bind
+func Routes() *web.Route {
+	var r = web.NewRoute()
+	r.Use(context.PrivateContexter())
+	r.Use(CheckInternalToken)
 
-	m.Group("/", func() {
-		m.Post("/ssh/authorized_keys", AuthorizedPublicKeyByContent)
-		m.Post("/ssh/:id/update/:repoid", UpdatePublicKeyInRepo)
-		m.Post("/hook/pre-receive/:owner/:repo", bind(private.HookOptions{}), HookPreReceive)
-		m.Post("/hook/post-receive/:owner/:repo", bind(private.HookOptions{}), HookPostReceive)
-		m.Post("/hook/set-default-branch/:owner/:repo/:branch", SetDefaultBranch)
-		m.Get("/serv/none/:keyid", ServNoCommand)
-		m.Get("/serv/command/:keyid/:owner/:repo", ServCommand)
-		m.Post("/manager/shutdown", Shutdown)
-		m.Post("/manager/restart", Restart)
-		m.Post("/manager/flush-queues", bind(private.FlushOptions{}), FlushQueues)
-		m.Post("/manager/pause-logging", PauseLogging)
-		m.Post("/manager/resume-logging", ResumeLogging)
-		m.Post("/manager/release-and-reopen-logging", ReleaseReopenLogging)
-		m.Post("/manager/add-logger", bind(private.LoggerOptions{}), AddLogger)
-		m.Post("/manager/remove-logger/:group/:name", RemoveLogger)
-		m.Post("/mail/send", SendEmail)
-	}, CheckInternalToken)
+	r.Post("/ssh/authorized_keys", AuthorizedPublicKeyByContent)
+	r.Post("/ssh/{id}/update/{repoid}", UpdatePublicKeyInRepo)
+	r.Post("/hook/pre-receive/{owner}/{repo}", bind(private.HookOptions{}), HookPreReceive)
+	r.Post("/hook/post-receive/{owner}/{repo}", bind(private.HookOptions{}), HookPostReceive)
+	r.Post("/hook/set-default-branch/{owner}/{repo}/{branch}", SetDefaultBranch)
+	r.Get("/serv/none/{keyid}", ServNoCommand)
+	r.Get("/serv/command/{keyid}/{owner}/{repo}", ServCommand)
+	r.Post("/manager/shutdown", Shutdown)
+	r.Post("/manager/restart", Restart)
+	r.Post("/manager/flush-queues", bind(private.FlushOptions{}), FlushQueues)
+	r.Post("/manager/pause-logging", PauseLogging)
+	r.Post("/manager/resume-logging", ResumeLogging)
+	r.Post("/manager/release-and-reopen-logging", ReleaseReopenLogging)
+	r.Post("/manager/add-logger", bind(private.LoggerOptions{}), AddLogger)
+	r.Post("/manager/remove-logger/{group}/{name}", RemoveLogger)
+	r.Post("/mail/send", SendEmail)
+
+	return r
 }