Serve `outbox` for Actor (#289)

* add statusesvisible convenience function

* add minID + onlyPublic to account statuses get

* move swagger collection stuff to common

* start working on Outbox GETting

* move functions into federationProcessor

* outboxToASCollection

* add statusesvisible convenience function

* add minID + onlyPublic to account statuses get

* move swagger collection stuff to common

* start working on Outbox GETting

* move functions into federationProcessor

* outboxToASCollection

* bit more work on outbox paging

* wrapNoteInCreate function

* test + hook up the processor functions

* don't do prev + next links on empty reply

* test get outbox through api

* don't fail on no status entries

* add outbox implementation doc

* typo

1 files changed, 103 insertions, 0 deletions

diff --git a/internal/processing/federation/federation.go b/internal/processing/federation/federation.go
new file mode 100644
index 000000000..b050406c5
--- /dev/null
+++ b/internal/processing/federation/federation.go
@@ -0,0 +1,103 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 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 federation
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/federation"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+	"github.com/superseriousbusiness/gotosocial/internal/visibility"
+)
+
+// Processor wraps functions for processing federation API requests.
+type Processor interface {
+	// GetUser handles the getting of a fedi/activitypub representation of a user/account, performing appropriate authentication
+	// before returning a JSON serializable interface to the caller.
+	GetUser(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// GetFollowers handles the getting of a fedi/activitypub representation of a user/account's followers, performing appropriate
+	// authentication before returning a JSON serializable interface to the caller.
+	GetFollowers(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// GetFollowing handles the getting of a fedi/activitypub representation of a user/account's following, performing appropriate
+	// authentication before returning a JSON serializable interface to the caller.
+	GetFollowing(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// GetStatus handles the getting of a fedi/activitypub representation of a particular status, performing appropriate
+	// authentication before returning a JSON serializable interface to the caller.
+	GetStatus(ctx context.Context, requestedUsername string, requestedStatusID string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// GetStatus handles the getting of a fedi/activitypub representation of replies to a status, performing appropriate
+	// authentication before returning a JSON serializable interface to the caller.
+	GetStatusReplies(ctx context.Context, requestedUsername string, requestedStatusID string, page bool, onlyOtherAccounts bool, minID string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// GetWebfingerAccount handles the GET for a webfinger resource. Most commonly, it will be used for returning account lookups.
+	GetWebfingerAccount(ctx context.Context, requestedUsername string) (*apimodel.WellKnownResponse, gtserror.WithCode)
+
+	// GetNodeInfoRel returns a well known response giving the path to node info.
+	GetNodeInfoRel(ctx context.Context, request *http.Request) (*apimodel.WellKnownResponse, gtserror.WithCode)
+
+	// GetNodeInfo returns a node info struct in response to a node info request.
+	GetNodeInfo(ctx context.Context, request *http.Request) (*apimodel.Nodeinfo, gtserror.WithCode)
+
+	// GetOutbox returns the activitypub representation of a local user's outbox.
+	// This contains links to PUBLIC posts made by this user.
+	GetOutbox(ctx context.Context, requestedUsername string, page bool, maxID string, minID string, requestURL *url.URL) (interface{}, gtserror.WithCode)
+
+	// PostInbox handles POST requests to a user's inbox for new activitypub messages.
+	//
+	// PostInbox returns true if the request was handled as an ActivityPub POST to an actor's inbox.
+	// If false, the request was not an ActivityPub request and may still be handled by the caller in another way, such as serving a web page.
+	//
+	// If the error is nil, then the ResponseWriter's headers and response has already been written. If a non-nil error is returned, then no response has been written.
+	//
+	// If the Actor was constructed with the Federated Protocol enabled, side effects will occur.
+	//
+	// If the Federated Protocol is not enabled, writes the http.StatusMethodNotAllowed status code in the response. No side effects occur.
+	PostInbox(ctx context.Context, w http.ResponseWriter, r *http.Request) (bool, error)
+}
+
+type processor struct {
+	db            db.DB
+	config        *config.Config
+	federator     federation.Federator
+	tc            typeutils.TypeConverter
+	filter        visibility.Filter
+	fromFederator chan messages.FromFederator
+}
+
+// New returns a new federation processor.
+func New(db db.DB, tc typeutils.TypeConverter, config *config.Config, federator federation.Federator, fromFederator chan messages.FromFederator) Processor {
+	return &processor{
+		db:            db,
+		config:        config,
+		federator:     federator,
+		tc:            tc,
+		filter:        visibility.NewFilter(db),
+		fromFederator: fromFederator,
+	}
+}