1 files changed, 80 insertions, 0 deletions
diff --git a/routers/api/v1/misc/nodeinfo.go b/routers/api/v1/misc/nodeinfo.go
new file mode 100644
index 0000000..9c2a0db
--- /dev/null
+++ b/routers/api/v1/misc/nodeinfo.go
@@ -0,0 +1,80 @@
+// 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 {
+		var cached bool
+		nodeInfoUsage, cached = ctx.Cache.Get(cacheKeyNodeInfoUsage).(structs.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.Put(cacheKeyNodeInfoUsage, nodeInfoUsage, 180); err != nil {
+				ctx.InternalServerError(err)
+				return
+			}
+		}
+	}
+
+	nodeInfo := &structs.NodeInfo{
+		Version: "2.1",
+		Software: structs.NodeInfoSoftware{
+			Name:       "forgejo",
+			Version:    setting.AppVer,
+			Repository: "https://codeberg.org/forgejo/forgejo.git",
+			Homepage:   "https://forgejo.org/",
+		},
+		Protocols: []string{"activitypub"},
+		Services: structs.NodeInfoServices{
+			Inbound:  []string{},
+			Outbound: []string{"rss2.0"},
+		},
+		OpenRegistrations: setting.Service.ShowRegistrationButton,
+		Usage:             nodeInfoUsage,
+	}
+	ctx.JSON(http.StatusOK, nodeInfo)
+}