Add NodeInfo endpoints

Includes new instance stats and the new option to show user stats, as
well.

app.go

@@ -18,6 +18,10 @@ import (
 
 const (
 	staticDir = "static/"
+
+	serverSoftware = "Write Freely"
+	softwareURL    = "https://writefreely.org"
+	softwareVer    = "0.1"
 )
 
 type app struct {

config/config.go

@@ -27,6 +27,8 @@ type (
 		MultiUser   bool `ini:"multiuser"`
 		OpenSignups bool `ini:"open_signups"`
 		Federation  bool `ini:"federation"`
+		PublicStats bool `ini:"public_stats"`
+		Private     bool `ini:"private"`
 
 		Name string `ini:"site_name"`
 
@@ -56,6 +58,7 @@ func New() *Config {
 		},
 		App: AppCfg{
 			Federation:     true,
+			PublicStats:    true,
 			MinUsernameLen: 3,
 		},
 	}

nodeinfo.go

@@ -0,0 +1,87 @@
+package writefreely
+
+import (
+	"fmt"
+	"github.com/writeas/go-nodeinfo"
+	"github.com/writeas/web-core/log"
+	"github.com/writeas/writefreely/config"
+)
+
+type nodeInfoResolver struct {
+	cfg *config.Config
+	db  *datastore
+}
+
+func nodeInfoConfig(cfg *config.Config) *nodeinfo.Config {
+	name := cfg.App.SiteName
+	return &nodeinfo.Config{
+		BaseURL: cfg.Server.Host,
+		InfoURL: "/api/nodeinfo",
+
+		Metadata: nodeinfo.Metadata{
+			NodeName:        name,
+			NodeDescription: "Minimal, federated blogging platform.",
+			Private:         cfg.App.Private,
+			Software: nodeinfo.SoftwareMeta{
+				HomePage: softwareURL,
+				GitHub:   "https://github.com/writeas/writefreely",
+				Follow:   "https://writing.exchange/@write_as",
+			},
+		},
+		Protocols: []nodeinfo.NodeProtocol{
+			nodeinfo.ProtocolActivityPub,
+		},
+		Services: nodeinfo.Services{
+			Inbound:  []nodeinfo.NodeService{},
+			Outbound: []nodeinfo.NodeService{},
+		},
+		Software: nodeinfo.SoftwareInfo{
+			Name:    serverSoftware,
+			Version: softwareVer,
+		},
+	}
+}
+
+func (r nodeInfoResolver) IsOpenRegistration() (bool, error) {
+	return !r.cfg.App.Private, nil
+}
+
+func (r nodeInfoResolver) Usage() (nodeinfo.Usage, error) {
+	var collCount, postCount, activeHalfYear, activeMonth int
+	err := r.db.QueryRow(`SELECT COUNT(*) FROM collections`).Scan(&collCount)
+	if err != nil {
+		collCount = 0
+	}
+	err = r.db.QueryRow(`SELECT COUNT(*) FROM posts`).Scan(&postCount)
+	if err != nil {
+		log.Error("Unable to fetch post counts: %v", err)
+	}
+
+	if r.cfg.App.PublicStats {
+		// Display bi-yearly / monthly stats
+		err = r.db.QueryRow(fmt.Sprintf(`SELECT COUNT(*) FROM (
+SELECT DISTINCT collection_id
+FROM posts
+INNER JOIN collections c
+ON collection_id = c.id
+WHERE collection_id IS NOT NULL
+	AND updated > DATE_SUB(NOW(), INTERVAL 6 MONTH)) co`, CollPublic)).Scan(&activeHalfYear)
+
+		err = r.db.QueryRow(fmt.Sprintf(`SELECT COUNT(*) FROM (
+SELECT DISTINCT collection_id
+FROM posts
+INNER JOIN FROM collections c
+ON collection_id = c.id
+WHERE collection_id IS NOT NULL
+	AND updated > DATE_SUB(NOW(), INTERVAL 1 MONTH)) co`, CollPublic)).Scan(&activeMonth)
+	}
+
+	return nodeinfo.Usage{
+		Users: nodeinfo.UsageUsers{
+			Total:          collCount,
+			ActiveHalfYear: activeHalfYear,
+			ActiveMonth:    activeMonth,
+		},
+		LocalPosts: postCount,
+	}, nil
+}

routes.go

@@ -2,8 +2,10 @@ package writefreely
 
 import (
 	"github.com/gorilla/mux"
+	"github.com/writeas/go-nodeinfo"
 	"github.com/writeas/web-core/log"
 	"github.com/writeas/writefreely/config"
+	"net/http"
 	"strings"
 )
 
@@ -28,4 +30,12 @@ func initRoutes(handler *Handler, r *mux.Router, cfg *config.Config, db *datasto
 
 	// Primary app routes
 	log.Info("Adding %s routes (multi-user)...", hostSubroute)
+	write := r.Host(hostSubroute).Subrouter()
+
+	// Federation endpoints
+	// nodeinfo
+	niCfg := nodeInfoConfig(cfg)
+	ni := nodeinfo.NewService(*niCfg, nodeInfoResolver{cfg, db})
+	write.HandleFunc(nodeinfo.NodeInfoPath, handler.LogHandlerFunc(http.HandlerFunc(ni.NodeInfoDiscover)))
+	write.HandleFunc(niCfg.InfoURL, handler.LogHandlerFunc(http.HandlerFunc(ni.NodeInfo)))
 }