Refactor "route" related code, fix Safari cookie bug (#24330)

Fix #24176

Clean some misuses of route package, clean some legacy FIXMEs

---------

Co-authored-by: Giteabot <teabot@gitea.io>

routers/web/user/home.go

@@ -30,6 +30,8 @@ import (
 	"code.gitea.io/gitea/modules/markup/markdown"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/routers/web/feed"
+	context_service "code.gitea.io/gitea/services/context"
 	issue_service "code.gitea.io/gitea/services/issue"
 	pull_service "code.gitea.io/gitea/services/pull"
 
@@ -815,3 +817,51 @@ func ShowGPGKeys(ctx *context.Context) {
 	writer.Close()
 	ctx.PlainTextBytes(http.StatusOK, buf.Bytes())
 }
+
+func UsernameSubRoute(ctx *context.Context) {
+	// WORKAROUND to support usernames with "." in it
+	// https://github.com/go-chi/chi/issues/781
+	username := ctx.Params("username")
+	reloadParam := func(suffix string) (success bool) {
+		ctx.SetParams("username", strings.TrimSuffix(username, suffix))
+		context_service.UserAssignmentWeb()(ctx)
+		return !ctx.Written()
+	}
+	switch {
+	case strings.HasSuffix(username, ".png"):
+		if reloadParam(".png") {
+			AvatarByUserName(ctx)
+		}
+	case strings.HasSuffix(username, ".keys"):
+		if reloadParam(".keys") {
+			ShowSSHKeys(ctx)
+		}
+	case strings.HasSuffix(username, ".gpg"):
+		if reloadParam(".gpg") {
+			ShowGPGKeys(ctx)
+		}
+	case strings.HasSuffix(username, ".rss"):
+		if !setting.Other.EnableFeed {
+			ctx.Error(http.StatusNotFound)
+			return
+		}
+		if reloadParam(".rss") {
+			context_service.UserAssignmentWeb()(ctx)
+			feed.ShowUserFeedRSS(ctx)
+		}
+	case strings.HasSuffix(username, ".atom"):
+		if !setting.Other.EnableFeed {
+			ctx.Error(http.StatusNotFound)
+			return
+		}
+		if reloadParam(".atom") {
+			feed.ShowUserFeedAtom(ctx)
+		}
+	default:
+		context_service.UserAssignmentWeb()(ctx)
+		if !ctx.Written() {
+			ctx.Data["EnableFeed"] = setting.Other.EnableFeed
+			Profile(ctx)
+		}
+	}
+}