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>

modules/context/api.go

@@ -6,18 +6,21 @@
 package context
 
 import (
+	"context"
 	"fmt"
+	"html"
 	"net/http"
 	"net/url"
 	"strings"
 
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/auth/sso"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/middlewares"
 	"code.gitea.io/gitea/modules/setting"
 
-	"gitea.com/macaron/csrf"
-	"gitea.com/macaron/macaron"
+	"gitea.com/go-chi/session"
 )
 
 // APIContext is a specific macaron context for API service
@@ -91,7 +94,7 @@ func (ctx *APIContext) Error(status int, title string, obj interface{}) {
 	if status == http.StatusInternalServerError {
 		log.ErrorWithSkip(1, "%s: %s", title, message)
 
-		if macaron.Env == macaron.PROD && !(ctx.User != nil && ctx.User.IsAdmin) {
+		if setting.IsProd() && !(ctx.User != nil && ctx.User.IsAdmin) {
 			message = ""
 		}
 	}
@@ -108,7 +111,7 @@ func (ctx *APIContext) InternalServerError(err error) {
 	log.ErrorWithSkip(1, "InternalServerError: %v", err)
 
 	var message string
-	if macaron.Env != macaron.PROD || (ctx.User != nil && ctx.User.IsAdmin) {
+	if !setting.IsProd() || (ctx.User != nil && ctx.User.IsAdmin) {
 		message = err.Error()
 	}
 
@@ -118,6 +121,20 @@ func (ctx *APIContext) InternalServerError(err error) {
 	})
 }
 
+var (
+	apiContextKey interface{} = "default_api_context"
+)
+
+// WithAPIContext set up api context in request
+func WithAPIContext(req *http.Request, ctx *APIContext) *http.Request {
+	return req.WithContext(context.WithValue(req.Context(), apiContextKey, ctx))
+}
+
+// GetAPIContext returns a context for API routes
+func GetAPIContext(req *http.Request) *APIContext {
+	return req.Context().Value(apiContextKey).(*APIContext)
+}
+
 func genAPILinks(curURL *url.URL, total, pageSize, curPage int) []string {
 	page := NewPagination(total, pageSize, curPage, 0)
 	paginater := page.Paginater
@@ -172,7 +189,7 @@ func (ctx *APIContext) RequireCSRF() {
 	headerToken := ctx.Req.Header.Get(ctx.csrf.GetHeaderName())
 	formValueToken := ctx.Req.FormValue(ctx.csrf.GetFormName())
 	if len(headerToken) > 0 || len(formValueToken) > 0 {
-		csrf.Validate(ctx.Context.Context, ctx.csrf)
+		Validate(ctx.Context, ctx.csrf)
 	} else {
 		ctx.Context.Error(401, "Missing CSRF token.")
 	}
@@ -201,42 +218,91 @@ func (ctx *APIContext) CheckForOTP() {
 }
 
 // APIContexter returns apicontext as macaron middleware
-func APIContexter() macaron.Handler {
-	return func(c *Context) {
-		ctx := &APIContext{
-			Context: c,
-		}
-		c.Map(ctx)
+func APIContexter() func(http.Handler) http.Handler {
+	var csrfOpts = getCsrfOpts()
+
+	return func(next http.Handler) http.Handler {
+
+		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			var locale = middlewares.Locale(w, req)
+			var ctx = APIContext{
+				Context: &Context{
+					Resp:    NewResponse(w),
+					Data:    map[string]interface{}{},
+					Locale:  locale,
+					Session: session.GetSession(req),
+					Repo: &Repository{
+						PullRequest: &PullRequest{},
+					},
+					Org: &Organization{},
+				},
+				Org: &APIOrganization{},
+			}
+
+			ctx.Req = WithAPIContext(WithContext(req, ctx.Context), &ctx)
+			ctx.csrf = Csrfer(csrfOpts, ctx.Context)
+
+			// If request sends files, parse them here otherwise the Query() can't be parsed and the CsrfToken will be invalid.
+			if ctx.Req.Method == "POST" && strings.Contains(ctx.Req.Header.Get("Content-Type"), "multipart/form-data") {
+				if err := ctx.Req.ParseMultipartForm(setting.Attachment.MaxSize << 20); err != nil && !strings.Contains(err.Error(), "EOF") { // 32MB max size
+					ctx.InternalServerError(err)
+					return
+				}
+			}
+
+			// Get user from session if logged in.
+			ctx.User, ctx.IsBasicAuth = sso.SignedInUser(ctx.Req, ctx.Resp, &ctx, ctx.Session)
+			if ctx.User != nil {
+				ctx.IsSigned = true
+				ctx.Data["IsSigned"] = ctx.IsSigned
+				ctx.Data["SignedUser"] = ctx.User
+				ctx.Data["SignedUserID"] = ctx.User.ID
+				ctx.Data["SignedUserName"] = ctx.User.Name
+				ctx.Data["IsAdmin"] = ctx.User.IsAdmin
+			} else {
+				ctx.Data["SignedUserID"] = int64(0)
+				ctx.Data["SignedUserName"] = ""
+			}
+
+			ctx.Resp.Header().Set(`X-Frame-Options`, `SAMEORIGIN`)
+
+			ctx.Data["CsrfToken"] = html.EscapeString(ctx.csrf.GetToken())
+
+			next.ServeHTTP(ctx.Resp, ctx.Req)
+		})
 	}
 }
 
 // ReferencesGitRepo injects the GitRepo into the Context
-func ReferencesGitRepo(allowEmpty bool) macaron.Handler {
-	return func(ctx *APIContext) {
-		// Empty repository does not have reference information.
-		if !allowEmpty && ctx.Repo.Repository.IsEmpty {
-			return
-		}
-
-		// For API calls.
-		if ctx.Repo.GitRepo == nil {
-			repoPath := models.RepoPath(ctx.Repo.Owner.Name, ctx.Repo.Repository.Name)
-			gitRepo, err := git.OpenRepository(repoPath)
-			if err != nil {
-				ctx.Error(500, "RepoRef Invalid repo "+repoPath, err)
+func ReferencesGitRepo(allowEmpty bool) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			ctx := GetAPIContext(req)
+			// Empty repository does not have reference information.
+			if !allowEmpty && ctx.Repo.Repository.IsEmpty {
 				return
 			}
-			ctx.Repo.GitRepo = gitRepo
-			// We opened it, we should close it
-			defer func() {
-				// If it's been set to nil then assume someone else has closed it.
-				if ctx.Repo.GitRepo != nil {
-					ctx.Repo.GitRepo.Close()
-				}
-			}()
-		}
 
-		ctx.Next()
+			// For API calls.
+			if ctx.Repo.GitRepo == nil {
+				repoPath := models.RepoPath(ctx.Repo.Owner.Name, ctx.Repo.Repository.Name)
+				gitRepo, err := git.OpenRepository(repoPath)
+				if err != nil {
+					ctx.Error(500, "RepoRef Invalid repo "+repoPath, err)
+					return
+				}
+				ctx.Repo.GitRepo = gitRepo
+				// We opened it, we should close it
+				defer func() {
+					// If it's been set to nil then assume someone else has closed it.
+					if ctx.Repo.GitRepo != nil {
+						ctx.Repo.GitRepo.Close()
+					}
+				}()
+			}
+
+			next.ServeHTTP(w, req)
+		})
 	}
 }
 
@@ -266,8 +332,9 @@ func (ctx *APIContext) NotFound(objs ...interface{}) {
 }
 
 // RepoRefForAPI handles repository reference names when the ref name is not explicitly given
-func RepoRefForAPI() macaron.Handler {
-	return func(ctx *APIContext) {
+func RepoRefForAPI(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		ctx := GetAPIContext(req)
 		// Empty repository does not have reference information.
 		if ctx.Repo.Repository.IsEmpty {
 			return
@@ -319,6 +386,6 @@ func RepoRefForAPI() macaron.Handler {
 			return
 		}
 
-		ctx.Next()
-	}
+		next.ServeHTTP(w, req)
+	})
 }