10 files changed, 863 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,
+	}
+}
diff --git a/internal/processing/federation/getfollowers.go b/internal/processing/federation/getfollowers.go
new file mode 100644
index 000000000..b17c90e07
--- /dev/null
+++ b/internal/processing/federation/getfollowers.go
@@ -0,0 +1,74 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) GetFollowers(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	requestedAccountURI, err := url.Parse(requestedAccount.URI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
+	}
+
+	requestedFollowers, err := p.federator.FederatingDB().Followers(ctx, requestedAccountURI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching followers for uri %s: %s", requestedAccountURI.String(), err))
+	}
+
+	data, err := streams.Serialize(requestedFollowers)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getfollowing.go b/internal/processing/federation/getfollowing.go
new file mode 100644
index 000000000..e2d50d238
--- /dev/null
+++ b/internal/processing/federation/getfollowing.go
@@ -0,0 +1,74 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) GetFollowing(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	requestedAccountURI, err := url.Parse(requestedAccount.URI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
+	}
+
+	requestedFollowing, err := p.federator.FederatingDB().Following(ctx, requestedAccountURI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching following for uri %s: %s", requestedAccountURI.String(), err))
+	}
+
+	data, err := streams.Serialize(requestedFollowing)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getnodeinfo.go b/internal/processing/federation/getnodeinfo.go
new file mode 100644
index 000000000..4eb8ad3b7
--- /dev/null
+++ b/internal/processing/federation/getnodeinfo.go
@@ -0,0 +1,69 @@
+/*
+   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"
+	"fmt"
+	"net/http"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+const (
+	nodeInfoVersion      = "2.0"
+	nodeInfoSoftwareName = "gotosocial"
+)
+
+var (
+	nodeInfoRel       = fmt.Sprintf("http://nodeinfo.diaspora.software/ns/schema/%s", nodeInfoVersion)
+	nodeInfoProtocols = []string{"activitypub"}
+)
+
+func (p *processor) GetNodeInfoRel(ctx context.Context, request *http.Request) (*apimodel.WellKnownResponse, gtserror.WithCode) {
+	return &apimodel.WellKnownResponse{
+		Links: []apimodel.Link{
+			{
+				Rel:  nodeInfoRel,
+				Href: fmt.Sprintf("%s://%s/nodeinfo/%s", p.config.Protocol, p.config.Host, nodeInfoVersion),
+			},
+		},
+	}, nil
+}
+
+func (p *processor) GetNodeInfo(ctx context.Context, request *http.Request) (*apimodel.Nodeinfo, gtserror.WithCode) {
+	return &apimodel.Nodeinfo{
+		Version: nodeInfoVersion,
+		Software: apimodel.NodeInfoSoftware{
+			Name:    nodeInfoSoftwareName,
+			Version: p.config.SoftwareVersion,
+		},
+		Protocols: nodeInfoProtocols,
+		Services: apimodel.NodeInfoServices{
+			Inbound:  []string{},
+			Outbound: []string{},
+		},
+		OpenRegistrations: p.config.AccountsConfig.OpenRegistration,
+		Usage: apimodel.NodeInfoUsage{
+			Users: apimodel.NodeInfoUsers{},
+		},
+		Metadata: make(map[string]interface{}),
+	}, nil
+}
diff --git a/internal/processing/federation/getoutbox.go b/internal/processing/federation/getoutbox.go
new file mode 100644
index 000000000..a3b2cff3c
--- /dev/null
+++ b/internal/processing/federation/getoutbox.go
@@ -0,0 +1,107 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) GetOutbox(ctx context.Context, requestedUsername string, page bool, maxID string, minID string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	// authorize the request:
+	// 1. check if a block exists between the requester and the requestee
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	var data map[string]interface{}
+	// now there are two scenarios:
+	// 1. we're asked for the whole collection and not a page -- we can just return the collection, with no items, but a link to 'first' page.
+	// 2. we're asked for a specific page; this can be either the first page or any other page
+
+	if !page {
+		/*
+			scenario 1: return the collection with no items
+			we want something that looks like this:
+			{
+				"@context": "https://www.w3.org/ns/activitystreams",
+				"id": "https://example.org/users/whatever/outbox",
+				"type": "OrderedCollection",
+				"first": "https://example.org/users/whatever/outbox?page=true",
+				"last": "https://example.org/users/whatever/outbox?min_id=0&page=true"
+			}
+		*/
+		collection, err := p.tc.OutboxToASCollection(ctx, requestedAccount.OutboxURI)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+
+		data, err = streams.Serialize(collection)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+
+		return data, nil
+	}
+
+	// scenario 2 -- get the requested page
+	// limit pages to 30 entries per page
+	publicStatuses, err := p.db.GetAccountStatuses(ctx, requestedAccount.ID, 30, true, maxID, minID, false, false, true)
+	if err != nil && err != db.ErrNoEntries {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	outboxPage, err := p.tc.StatusesToASOutboxPage(ctx, requestedAccount.OutboxURI, maxID, minID, publicStatuses)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+	data, err = streams.Serialize(outboxPage)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getstatus.go b/internal/processing/federation/getstatus.go
new file mode 100644
index 000000000..a4f251023
--- /dev/null
+++ b/internal/processing/federation/getstatus.go
@@ -0,0 +1,91 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) GetStatus(ctx context.Context, requestedUsername string, requestedStatusID string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	// authorize the request:
+	// 1. check if a block exists between the requester and the requestee
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	// get the status out of the database here
+	s := &gtsmodel.Status{}
+	if err := p.db.GetWhere(ctx, []db.Where{
+		{Key: "id", Value: requestedStatusID},
+		{Key: "account_id", Value: requestedAccount.ID},
+	}, s); err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting status with id %s and account id %s: %s", requestedStatusID, requestedAccount.ID, err))
+	}
+
+	visible, err := p.filter.StatusVisible(ctx, s, requestingAccount)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+	if !visible {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("status with id %s not visible to user with id %s", s.ID, requestingAccount.ID))
+	}
+
+	// requester is authorized to view the status, so convert it to AP representation and serialize it
+	asStatus, err := p.tc.StatusToAS(ctx, s)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	data, err := streams.Serialize(asStatus)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getstatusreplies.go b/internal/processing/federation/getstatusreplies.go
new file mode 100644
index 000000000..0fa0cc386
--- /dev/null
+++ b/internal/processing/federation/getstatusreplies.go
@@ -0,0 +1,164 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) GetStatusReplies(ctx context.Context, requestedUsername string, requestedStatusID string, page bool, onlyOtherAccounts bool, minID string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	// authorize the request:
+	// 1. check if a block exists between the requester and the requestee
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	// get the status out of the database here
+	s := &gtsmodel.Status{}
+	if err := p.db.GetWhere(ctx, []db.Where{
+		{Key: "id", Value: requestedStatusID},
+		{Key: "account_id", Value: requestedAccount.ID},
+	}, s); err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting status with id %s and account id %s: %s", requestedStatusID, requestedAccount.ID, err))
+	}
+
+	visible, err := p.filter.StatusVisible(ctx, s, requestingAccount)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+	if !visible {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("status with id %s not visible to user with id %s", s.ID, requestingAccount.ID))
+	}
+
+	var data map[string]interface{}
+
+	// now there are three scenarios:
+	// 1. we're asked for the whole collection and not a page -- we can just return the collection, with no items, but a link to 'first' page.
+	// 2. we're asked for a page but only_other_accounts has not been set in the query -- so we should just return the first page of the collection, with no items.
+	// 3. we're asked for a page, and only_other_accounts has been set, and min_id has optionally been set -- so we need to return some actual items!
+
+	if !page {
+		// scenario 1
+
+		// get the collection
+		collection, err := p.tc.StatusToASRepliesCollection(ctx, s, onlyOtherAccounts)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+
+		data, err = streams.Serialize(collection)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+	} else if page && requestURL.Query().Get("only_other_accounts") == "" {
+		// scenario 2
+
+		// get the collection
+		collection, err := p.tc.StatusToASRepliesCollection(ctx, s, onlyOtherAccounts)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		// but only return the first page
+		data, err = streams.Serialize(collection.GetActivityStreamsFirst().GetActivityStreamsCollectionPage())
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+	} else {
+		// scenario 3
+		// get immediate children
+		replies, err := p.db.GetStatusChildren(ctx, s, true, minID)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+
+		// filter children and extract URIs
+		replyURIs := map[string]*url.URL{}
+		for _, r := range replies {
+			// only show public or unlocked statuses as replies
+			if r.Visibility != gtsmodel.VisibilityPublic && r.Visibility != gtsmodel.VisibilityUnlocked {
+				continue
+			}
+
+			// respect onlyOtherAccounts parameter
+			if onlyOtherAccounts && r.AccountID == requestedAccount.ID {
+				continue
+			}
+
+			// only show replies that the status owner can see
+			visibleToStatusOwner, err := p.filter.StatusVisible(ctx, r, requestedAccount)
+			if err != nil || !visibleToStatusOwner {
+				continue
+			}
+
+			// only show replies that the requester can see
+			visibleToRequester, err := p.filter.StatusVisible(ctx, r, requestingAccount)
+			if err != nil || !visibleToRequester {
+				continue
+			}
+
+			rURI, err := url.Parse(r.URI)
+			if err != nil {
+				continue
+			}
+
+			replyURIs[r.ID] = rURI
+		}
+
+		repliesPage, err := p.tc.StatusURIsToASRepliesPage(ctx, s, onlyOtherAccounts, minID, replyURIs)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		data, err = streams.Serialize(repliesPage)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getuser.go b/internal/processing/federation/getuser.go
new file mode 100644
index 000000000..0d80e528e
--- /dev/null
+++ b/internal/processing/federation/getuser.go
@@ -0,0 +1,85 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (p *processor) GetUser(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	var requestedPerson vocab.ActivityStreamsPerson
+	if util.IsPublicKeyPath(requestURL) {
+		// if it's a public key path, we don't need to authenticate but we'll only serve the bare minimum user profile needed for the public key
+		requestedPerson, err = p.tc.AccountToASMinimal(ctx, requestedAccount)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+	} else if util.IsUserPath(requestURL) {
+		// if it's a user path, we want to fully authenticate the request before we serve any data, and then we can serve a more complete profile
+		requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+		if err != nil || !authenticated {
+			return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+		}
+
+		// if we're not already handshaking/dereferencing a remote account, dereference it now
+		if !p.federator.Handshaking(ctx, requestedUsername, requestingAccountURI) {
+			requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+			if err != nil {
+				return nil, gtserror.NewErrorNotAuthorized(err)
+			}
+
+			blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+			if err != nil {
+				return nil, gtserror.NewErrorInternalError(err)
+			}
+
+			if blocked {
+				return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+			}
+		}
+
+		requestedPerson, err = p.tc.AccountToAS(ctx, requestedAccount)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+	} else {
+		return nil, gtserror.NewErrorBadRequest(fmt.Errorf("path was not public key path or user path"))
+	}
+
+	data, err := streams.Serialize(requestedPerson)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
diff --git a/internal/processing/federation/getwebfinger.go b/internal/processing/federation/getwebfinger.go
new file mode 100644
index 000000000..aaa7687be
--- /dev/null
+++ b/internal/processing/federation/getwebfinger.go
@@ -0,0 +1,64 @@
+/*
+   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"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+const (
+	webfingerProfilePage            = "http://webfinger.net/rel/profile-page"
+	webFingerProfilePageContentType = "text/html"
+	webfingerSelf                   = "self"
+	webFingerSelfContentType        = "application/activity+json"
+	webfingerAccount                = "acct"
+)
+
+func (p *processor) GetWebfingerAccount(ctx context.Context, requestedUsername string) (*apimodel.WellKnownResponse, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// return the webfinger representation
+	return &apimodel.WellKnownResponse{
+		Subject: fmt.Sprintf("%s:%s@%s", webfingerAccount, requestedAccount.Username, p.config.AccountDomain),
+		Aliases: []string{
+			requestedAccount.URI,
+			requestedAccount.URL,
+		},
+		Links: []apimodel.Link{
+			{
+				Rel:  webfingerProfilePage,
+				Type: webFingerProfilePageContentType,
+				Href: requestedAccount.URL,
+			},
+			{
+				Rel:  webfingerSelf,
+				Type: webFingerSelfContentType,
+				Href: requestedAccount.URI,
+			},
+		},
+	}, nil
+}
diff --git a/internal/processing/federation/postinbox.go b/internal/processing/federation/postinbox.go
new file mode 100644
index 000000000..df9da0a51
--- /dev/null
+++ b/internal/processing/federation/postinbox.go
@@ -0,0 +1,32 @@
+/*
+   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"
+
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (p *processor) PostInbox(ctx context.Context, w http.ResponseWriter, r *http.Request) (bool, error) {
+	// pass the fromFederator channel through to postInbox, since it'll be needed later
+	contextWithChannel := context.WithValue(ctx, util.APFromFederatorChanKey, p.fromFederator)
+	return p.federator.FederatingActor().PostInbox(contextWithChannel, w, r)
+}