Mark unused&immature activitypub as "not implemented" (#36789)

After many years, "activitypub" is still "in progress" and no real
progress for end users. So it is not mature.

Temporarily mark the endpoints as "501 not implemented",
and wait until the whole design is stable and usable.

routers/api/v1/misc/nodeinfo.go

@@ -1,78 +0,0 @@
-// Copyright 2021 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package misc
-
-import (
-	"net/http"
-	"time"
-
-	issues_model "code.gitea.io/gitea/models/issues"
-	user_model "code.gitea.io/gitea/models/user"
-	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/structs"
-	"code.gitea.io/gitea/services/context"
-)
-
-const cacheKeyNodeInfoUsage = "API_NodeInfoUsage"
-
-// NodeInfo returns the NodeInfo for the Gitea instance to allow for federation
-func NodeInfo(ctx *context.APIContext) {
-	// swagger:operation GET /nodeinfo miscellaneous getNodeInfo
-	// ---
-	// summary: Returns the nodeinfo of the Gitea application
-	// produces:
-	// - application/json
-	// responses:
-	//   "200":
-	//     "$ref": "#/responses/NodeInfo"
-
-	nodeInfoUsage := structs.NodeInfoUsage{}
-	if setting.Federation.ShareUserStatistics {
-		cached, _ := ctx.Cache.GetJSON(cacheKeyNodeInfoUsage, &nodeInfoUsage)
-		if !cached {
-			usersTotal := int(user_model.CountUsers(ctx, nil))
-			now := time.Now()
-			timeOneMonthAgo := now.AddDate(0, -1, 0).Unix()
-			timeHaveYearAgo := now.AddDate(0, -6, 0).Unix()
-			usersActiveMonth := int(user_model.CountUsers(ctx, &user_model.CountUserFilter{LastLoginSince: &timeOneMonthAgo}))
-			usersActiveHalfyear := int(user_model.CountUsers(ctx, &user_model.CountUserFilter{LastLoginSince: &timeHaveYearAgo}))
-
-			allIssues, _ := issues_model.CountIssues(ctx, &issues_model.IssuesOptions{})
-			allComments, _ := issues_model.CountComments(ctx, &issues_model.FindCommentsOptions{})
-
-			nodeInfoUsage = structs.NodeInfoUsage{
-				Users: structs.NodeInfoUsageUsers{
-					Total:          usersTotal,
-					ActiveMonth:    usersActiveMonth,
-					ActiveHalfyear: usersActiveHalfyear,
-				},
-				LocalPosts:    int(allIssues),
-				LocalComments: int(allComments),
-			}
-
-			if err := ctx.Cache.PutJSON(cacheKeyNodeInfoUsage, nodeInfoUsage, 180); err != nil {
-				ctx.APIErrorInternal(err)
-				return
-			}
-		}
-	}
-
-	nodeInfo := &structs.NodeInfo{
-		Version: "2.1",
-		Software: structs.NodeInfoSoftware{
-			Name:       "gitea",
-			Version:    setting.AppVer,
-			Repository: "https://github.com/go-gitea/gitea.git",
-			Homepage:   "https://gitea.io/",
-		},
-		Protocols: []string{"activitypub"},
-		Services: structs.NodeInfoServices{
-			Inbound:  []string{},
-			Outbound: []string{"rss2.0"},
-		},
-		OpenRegistrations: setting.Service.ShowRegistrationButton,
-		Usage:             nodeInfoUsage,
-	}
-	ctx.JSON(http.StatusOK, nodeInfo)
-}