[feature] Add local user and post count to nodeinfo responses (#1325)

* Add local user and post count to nodeinfo responses

This fixes #1307 (at least partially). The nodeinfo endpoint should now
return the total users on an instance, along with their post count.

* Update NodeInfoUsers docstring and swagger yaml file

docs/api/swagger.yaml

@@ -100,13 +100,22 @@ definitions:
         x-go-package: github.com/superseriousbusiness/gotosocial/internal/api/model
     NodeInfoUsage:
         properties:
+            localPosts:
+                format: int64
+                type: integer
+                x-go-name: LocalPosts
             users:
                 $ref: '#/definitions/NodeInfoUsers'
         title: NodeInfoUsage represents usage information about this server, such as number of users.
         type: object
         x-go-package: github.com/superseriousbusiness/gotosocial/internal/api/model
     NodeInfoUsers:
-        title: NodeInfoUsers is a stub for usage information, currently empty.
+        properties:
+            total:
+                format: int64
+                type: integer
+                x-go-name: Total
+        title: NodeInfoUsers represents aggregate information about the users on the server.
         type: object
         x-go-package: github.com/superseriousbusiness/gotosocial/internal/api/model
     Source:

internal/api/model/well-known.go

@@ -80,7 +80,10 @@ type NodeInfoServices struct {
 // NodeInfoUsage represents usage information about this server, such as number of users.
 type NodeInfoUsage struct {
 	Users      NodeInfoUsers `json:"users"`
+	LocalPosts int           `json:"localPosts"`
 }
 
-// NodeInfoUsers is a stub for usage information, currently empty.
-type NodeInfoUsers struct{}
+// NodeInfoUsers represents aggregate information about the users on the server.
+type NodeInfoUsers struct {
+	Total int `json:"total"`
+}

internal/processing/federation/getnodeinfo.go

@@ -55,6 +55,17 @@ func (p *processor) GetNodeInfo(ctx context.Context) (*apimodel.Nodeinfo, gtserr
 	openRegistration := config.GetAccountsRegistrationOpen()
 	softwareVersion := config.GetSoftwareVersion()
 
+	host := config.GetHost()
+	userCount, err := p.db.CountInstanceUsers(ctx, host)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err, "Unable to query instance user count")
+	}
+
+	postCount, err := p.db.CountInstanceStatuses(ctx, host)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err, "Unable to query instance status count")
+	}
+
 	return &apimodel.Nodeinfo{
 		Version: nodeInfoVersion,
 		Software: apimodel.NodeInfoSoftware{
@@ -68,7 +79,10 @@ func (p *processor) GetNodeInfo(ctx context.Context) (*apimodel.Nodeinfo, gtserr
 		},
 		OpenRegistrations: openRegistration,
 		Usage: apimodel.NodeInfoUsage{
-			Users: apimodel.NodeInfoUsers{},
+			Users: apimodel.NodeInfoUsers{
+				Total: userCount,
+			},
+			LocalPosts: postCount,
 		},
 		Metadata: make(map[string]interface{}),
 	}, nil