[chore] Deinterface processor and subprocessors (#1501)

* [chore] Deinterface processor and subprocessors

* expose subprocessors via function calls

* missing license header

internal/processing/fedi/wellknown.go

@@ -0,0 +1,126 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package fedi
+
+import (
+	"context"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+const (
+	nodeInfoVersion                 = "2.0"
+	nodeInfoSoftwareName            = "gotosocial"
+	nodeInfoRel                     = "http://nodeinfo.diaspora.software/ns/schema/" + nodeInfoVersion
+	webfingerProfilePage            = "http://webfinger.net/rel/profile-page"
+	webFingerProfilePageContentType = "text/html"
+	webfingerSelf                   = "self"
+	webFingerSelfContentType        = "application/activity+json"
+	webfingerAccount                = "acct"
+)
+
+var (
+	nodeInfoProtocols = []string{"activitypub"}
+	nodeInfoInbound   = []string{}
+	nodeInfoOutbound  = []string{}
+	nodeInfoMetadata  = make(map[string]interface{})
+)
+
+// NodeInfoRelGet returns a well known response giving the path to node info.
+func (p *Processor) NodeInfoRelGet(ctx context.Context) (*apimodel.WellKnownResponse, gtserror.WithCode) {
+	protocol := config.GetProtocol()
+	host := config.GetHost()
+
+	return &apimodel.WellKnownResponse{
+		Links: []apimodel.Link{
+			{
+				Rel:  nodeInfoRel,
+				Href: fmt.Sprintf("%s://%s/nodeinfo/%s", protocol, host, nodeInfoVersion),
+			},
+		},
+	}, nil
+}
+
+// NodeInfoGet returns a node info struct in response to a node info request.
+func (p *Processor) NodeInfoGet(ctx context.Context) (*apimodel.Nodeinfo, gtserror.WithCode) {
+	host := config.GetHost()
+
+	userCount, err := p.db.CountInstanceUsers(ctx, host)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	postCount, err := p.db.CountInstanceStatuses(ctx, host)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return &apimodel.Nodeinfo{
+		Version: nodeInfoVersion,
+		Software: apimodel.NodeInfoSoftware{
+			Name:    nodeInfoSoftwareName,
+			Version: config.GetSoftwareVersion(),
+		},
+		Protocols: nodeInfoProtocols,
+		Services: apimodel.NodeInfoServices{
+			Inbound:  nodeInfoInbound,
+			Outbound: nodeInfoOutbound,
+		},
+		OpenRegistrations: config.GetAccountsRegistrationOpen(),
+		Usage: apimodel.NodeInfoUsage{
+			Users: apimodel.NodeInfoUsers{
+				Total: userCount,
+			},
+			LocalPosts: postCount,
+		},
+		Metadata: nodeInfoMetadata,
+	}, nil
+}
+
+// WebfingerGet handles the GET for a webfinger resource. Most commonly, it will be used for returning account lookups.
+func (p *Processor) WebfingerGet(ctx context.Context, requestedUsername string) (*apimodel.WellKnownResponse, gtserror.WithCode) {
+	// Get the local account the request is referring to.
+	requestedAccount, err := p.db.GetAccountByUsernameDomain(ctx, requestedUsername, "")
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	return &apimodel.WellKnownResponse{
+		Subject: webfingerAccount + ":" + requestedAccount.Username + "@" + config.GetAccountDomain(),
+		Aliases: []string{
+			requestedAccount.URI,
+			requestedAccount.URL,
+		},
+		Links: []apimodel.Link{
+			{
+				Rel:  webfingerProfilePage,
+				Type: webFingerProfilePageContentType,
+				Href: requestedAccount.URL,
+			},
+			{
+				Rel:  webfingerSelf,
+				Type: webFingerSelfContentType,
+				Href: requestedAccount.URI,
+			},
+		},
+	}, nil
+}