federate statuses

internal/api/s2s/user/followers.go

@@ -0,0 +1,58 @@
+/*
+   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 user
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+func (m *Module) FollowersGETHandler(c *gin.Context) {
+	l := m.log.WithFields(logrus.Fields{
+		"func": "FollowersGETHandler",
+		"url":  c.Request.RequestURI,
+	})
+
+	requestedUsername := c.Param(UsernameKey)
+	if requestedUsername == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		return
+	}
+
+	// make sure this actually an AP request
+	format := c.NegotiateFormat(ActivityPubAcceptHeaders...)
+	if format == "" {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": "could not negotiate format with given Accept header(s)"})
+		return
+	}
+	l.Tracef("negotiated format: %s", format)
+
+	// make a copy of the context to pass along so we don't break anything
+	cp := c.Copy()
+	user, err := m.processor.GetFediFollowers(requestedUsername, cp.Request) // GetFediUser handles auth as well
+	if err != nil {
+		l.Info(err.Error())
+		c.JSON(err.Code(), gin.H{"error": err.Safe()})
+		return
+	}
+
+	c.JSON(http.StatusOK, user)
+}

internal/api/s2s/user/statusget.go

@@ -0,0 +1,46 @@
+package user
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+func (m *Module) StatusGETHandler(c *gin.Context) {
+	l := m.log.WithFields(logrus.Fields{
+		"func": "StatusGETHandler",
+		"url":  c.Request.RequestURI,
+	})
+
+	requestedUsername := c.Param(UsernameKey)
+	if requestedUsername == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		return
+	}
+
+	requestedStatusID := c.Param(StatusIDKey)
+	if requestedStatusID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no status id specified in request"})
+		return
+	}
+
+	// make sure this actually an AP request
+	format := c.NegotiateFormat(ActivityPubAcceptHeaders...)
+	if format == "" {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": "could not negotiate format with given Accept header(s)"})
+		return
+	}
+	l.Tracef("negotiated format: %s", format)
+
+	// make a copy of the context to pass along so we don't break anything
+	cp := c.Copy()
+	status, err := m.processor.GetFediStatus(requestedUsername, requestedStatusID, cp.Request) // handles auth as well
+	if err != nil {
+		l.Info(err.Error())
+		c.JSON(err.Code(), gin.H{"error": err.Safe()})
+		return
+	}
+
+	c.JSON(http.StatusOK, status)
+}

internal/api/s2s/user/user.go

@@ -32,6 +32,8 @@ import (
 const (
 	// UsernameKey is for account usernames.
 	UsernameKey = "username"
+	// StatusIDKey is for status IDs
+	StatusIDKey = "status"
 	// UsersBasePath is the base path for serving information about Users eg https://example.org/users
 	UsersBasePath = "/" + util.UsersPath
 	// UsersBasePathWithUsername is just the users base path with the Username key in it.
@@ -40,6 +42,10 @@ const (
 	UsersBasePathWithUsername = UsersBasePath + "/:" + UsernameKey
 	// UsersInboxPath is for serving POST requests to a user's inbox with the given username key.
 	UsersInboxPath = UsersBasePathWithUsername + "/" + util.InboxPath
+	// UsersFollowersPath is for serving GET request's to a user's followers list, with the given username key.
+	UsersFollowersPath = UsersBasePathWithUsername + "/" + util.FollowersPath
+	// UsersStatusPath is for serving GET requests to a particular status by a user, with the given username key and status ID
+	UsersStatusPath = UsersBasePathWithUsername + "/" + util.StatusesPath + "/:" + StatusIDKey
 )
 
 // ActivityPubAcceptHeaders represents the Accept headers mentioned here:
@@ -69,5 +75,7 @@ func New(config *config.Config, processor message.Processor, log *logrus.Logger)
 func (m *Module) Route(s router.Router) error {
 	s.AttachHandler(http.MethodGet, UsersBasePathWithUsername, m.UsersGETHandler)
 	s.AttachHandler(http.MethodPost, UsersInboxPath, m.InboxPOSTHandler)
+	s.AttachHandler(http.MethodGet, UsersFollowersPath, m.FollowersGETHandler)
+	s.AttachHandler(http.MethodGet, UsersStatusPath, m.StatusGETHandler)
 	return nil
 }

internal/db/pg/pg.go

@@ -303,7 +303,6 @@ func (ps *postgresService) DeleteWhere(where []db.Where, i interface{}) error {
 		q = q.Where("? = ?", pg.Safe(w.Key), w.Value)
 	}
 
-
 	if _, err := q.Delete(); err != nil {
 		// if there are no rows *anyway* then that's fine
 		// just return err if there's an actual error
@@ -1109,6 +1108,11 @@ func (ps *postgresService) WhoFavedStatus(status *gtsmodel.Status) ([]*gtsmodel.
 */
 
 func (ps *postgresService) MentionStringsToMentions(targetAccounts []string, originAccountID string, statusID string) ([]*gtsmodel.Mention, error) {
+	ogAccount := &gtsmodel.Account{}
+	if err := ps.conn.Model(ogAccount).Where("id = ?", originAccountID).Select(); err != nil {
+		return nil, err
+	}
+
 	menchies := []*gtsmodel.Mention{}
 	for _, a := range targetAccounts {
 		// A mentioned account looks like "@test@example.org" or just "@test" for a local account
@@ -1167,8 +1171,12 @@ func (ps *postgresService) MentionStringsToMentions(targetAccounts []string, ori
 		// id, createdAt and updatedAt will be populated by the db, so we have everything we need!
 		menchies = append(menchies, &gtsmodel.Mention{
 			StatusID:            statusID,
-			OriginAccountID: originAccountID,
+			OriginAccountID:     ogAccount.ID,
+			OriginAccountURI:    ogAccount.URI,
 			TargetAccountID:     mentionedAccount.ID,
+			NameString:          a,
+			MentionedAccountURI: mentionedAccount.URI,
+			GTSAccount:          mentionedAccount,
 		})
 	}
 	return menchies, nil

internal/federation/federating_db.go

@@ -657,6 +657,19 @@ func (f *federatingDB) NewID(c context.Context, t vocab.Type) (id *url.URL, err
 				}
 			}
 		}
+	case gtsmodel.ActivityStreamsNote:
+		// NOTE aka STATUS
+		// ID might already be set on a note we've created, so check it here and return it if it is
+		note, ok := t.(vocab.ActivityStreamsNote)
+		if !ok {
+			return nil, errors.New("newid: follow couldn't be parsed into vocab.ActivityStreamsNote")
+		}
+		idProp := note.GetJSONLDId()
+		if idProp != nil {
+			if idProp.IsIRI() {
+				return idProp.GetIRI(), nil
+			}
+		}
 	}
 
 	// fallback default behavior: just return a random UUID after our protocol and host

internal/federation/federator.go

@@ -34,6 +34,8 @@ import (
 type Federator interface {
 	// FederatingActor returns the underlying pub.FederatingActor, which can be used to send activities, and serve actors at inboxes/outboxes.
 	FederatingActor() pub.FederatingActor
+	// FederatingDB returns the underlying FederatingDB interface.
+	FederatingDB() FederatingDB
 	// AuthenticateFederatedRequest can be used to check the authenticity of incoming http-signed requests for federating resources.
 	// The given username will be used to create a transport for making outgoing requests. See the implementation for more detailed comments.
 	AuthenticateFederatedRequest(username string, r *http.Request) (*url.URL, error)

internal/federation/util.go

@@ -27,11 +27,13 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"strings"
 
 	"github.com/go-fed/activity/pub"
 	"github.com/go-fed/activity/streams"
 	"github.com/go-fed/activity/streams/vocab"
 	"github.com/go-fed/httpsig"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/transport"
 	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
@@ -128,6 +130,21 @@ func (f *federator) AuthenticateFederatedRequest(username string, r *http.Reques
 		return nil, fmt.Errorf("could not parse key id into a url: %s", err)
 	}
 
+	var publicKey interface{}
+	var pkOwnerURI *url.URL
+	if strings.EqualFold(requestingPublicKeyID.Host, f.config.Host) {
+		// the request is coming from INSIDE THE HOUSE so skip the remote dereferencing
+		requestingLocalAccount := &gtsmodel.Account{}
+		if err := f.db.GetWhere([]db.Where{{Key: "public_key_uri", Value: requestingPublicKeyID.String()}}, requestingLocalAccount); err != nil {
+			return nil, fmt.Errorf("couldn't get local account with public key uri %s from the database: %s", requestingPublicKeyID.String(), err)
+		}
+		publicKey = requestingLocalAccount.PublicKey
+		pkOwnerURI, err = url.Parse(requestingLocalAccount.URI)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing url %s: %s", requestingLocalAccount.URI, err)
+		}
+	} else {
+		// the request is remote, so we need to authenticate the request properly by dereferencing the remote key
 		transport, err := f.GetTransportForUser(username)
 		if err != nil {
 			return nil, fmt.Errorf("transport err: %s", err)
@@ -158,26 +175,27 @@ func (f *federator) AuthenticateFederatedRequest(username string, r *http.Reques
 			return nil, errors.New("could not decode publicKeyPem to PUBLIC KEY pem block type")
 		}
 
-	p, err := x509.ParsePKIXPublicKey(block.Bytes)
+		publicKey, err = x509.ParsePKIXPublicKey(block.Bytes)
 		if err != nil {
 			return nil, fmt.Errorf("could not parse public key from block bytes: %s", err)
 		}
-	if p == nil {
-		return nil, errors.New("returned public key was empty")
-	}
-
-	// do the actual authentication here!
-	algo := httpsig.RSA_SHA256 // TODO: make this more robust
-	if err := verifier.Verify(p, algo); err != nil {
-		return nil, fmt.Errorf("error verifying key %s: %s", requestingPublicKeyID.String(), err)
-	}
 
 		// all good! we just need the URI of the key owner to return
 		pkOwnerProp := requestingPublicKey.GetW3IDSecurityV1Owner()
 		if pkOwnerProp == nil || !pkOwnerProp.IsIRI() {
 			return nil, errors.New("publicKeyOwner property is not provided or it is not embedded as a value")
 		}
-	pkOwnerURI := pkOwnerProp.GetIRI()
+		pkOwnerURI = pkOwnerProp.GetIRI()
+	}
+	if publicKey == nil {
+		return nil, errors.New("returned public key was empty")
+	}
+
+	// do the actual authentication here!
+	algo := httpsig.RSA_SHA256 // TODO: make this more robust
+	if err := verifier.Verify(publicKey, algo); err != nil {
+		return nil, fmt.Errorf("error verifying key %s: %s", requestingPublicKeyID.String(), err)
+	}
 
 	return pkOwnerURI, nil
 }

internal/gtsmodel/mention.go

@@ -38,6 +38,14 @@ type Mention struct {
 	TargetAccountID string `pg:",notnull"`
 	// Prevent this mention from generating a notification?
 	Silent bool
+
+	/*
+		NON-DATABASE CONVENIENCE FIELDS
+		These fields are just for convenience while passing the mention
+		around internally, to make fewer database calls and whatnot. They're
+		not meant to be put in the database!
+	*/
+
 	// NameString is for putting in the namestring of the mentioned user
 	// before the mention is dereferenced. Should be in a form along the lines of:
 	// @whatever_username@example.org
@@ -48,4 +56,6 @@ type Mention struct {
 	//
 	// This will not be put in the database, it's just for convenience.
 	MentionedAccountURI string `pg:"-"`
+	// A pointer to the gtsmodel account of the mentioned account.
+	GTSAccount *Account `pg:"-"`
 }

internal/message/fediprocess.go

@@ -22,6 +22,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"net/url"
 
 	"github.com/go-fed/activity/streams"
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
@@ -122,6 +123,89 @@ func (p *processor) GetFediUser(requestedUsername string, request *http.Request)
 	return data, nil
 }
 
+func (p *processor) GetFediFollowers(requestedUsername string, request *http.Request) (interface{}, ErrorWithCode) {
+	// get the account the request is referring to
+	requestedAccount := &gtsmodel.Account{}
+	if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
+		return nil, NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
+	if err != nil {
+		return nil, NewErrorNotAuthorized(err)
+	}
+
+	blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
+	if err != nil {
+		return nil, NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, 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, NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
+	}
+
+	requestedFollowers, err := p.federator.FederatingDB().Followers(context.Background(), requestedAccountURI)
+	if err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("error fetching followers for uri %s: %s", requestedAccountURI.String(), err))
+	}
+
+	data, err := streams.Serialize(requestedFollowers)
+	if err != nil {
+		return nil, NewErrorInternalError(err)
+	}
+
+	return data, nil
+}
+
+func (p *processor) GetFediStatus(requestedUsername string, requestedStatusID string, request *http.Request) (interface{}, ErrorWithCode) {
+		// get the account the request is referring to
+		requestedAccount := &gtsmodel.Account{}
+		if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
+			return nil, NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+		}
+
+		// authenticate the request
+		requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
+		if err != nil {
+			return nil, NewErrorNotAuthorized(err)
+		}
+
+		blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
+		if err != nil {
+			return nil, NewErrorInternalError(err)
+		}
+
+		if blocked {
+			return nil, NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+		}
+
+		s := &gtsmodel.Status{}
+		if err := p.db.GetWhere([]db.Where{
+			{Key: "id", Value: requestedStatusID},
+			{Key: "account_id", Value: requestedAccount.ID},
+		}, s); err != nil {
+			return nil, NewErrorNotFound(fmt.Errorf("database error getting status with id %s and account id %s: %s", requestedStatusID, requestedAccount.ID, err))
+		}
+
+		asStatus, err := p.tc.StatusToAS(s)
+		if err != nil {
+			return nil, NewErrorInternalError(err)
+		}
+
+		data, err := streams.Serialize(asStatus)
+		if err != nil {
+			return nil, NewErrorInternalError(err)
+		}
+
+		return data, nil
+}
+
 func (p *processor) GetWebfingerAccount(requestedUsername string, request *http.Request) (*apimodel.WebfingerAccountResponse, ErrorWithCode) {
 	// get the account the request is referring to
 	requestedAccount := &gtsmodel.Account{}

internal/message/fromclientapiprocess.go

@@ -90,30 +90,18 @@ func (p *processor) processFromClientAPI(clientMsg gtsmodel.FromClientAPI) error
 }
 
 func (p *processor) federateStatus(status *gtsmodel.Status) error {
-	// // derive the sending account -- it might be attached to the status already
-	// sendingAcct := &gtsmodel.Account{}
-	// if status.GTSAccount != nil {
-	// 	sendingAcct = status.GTSAccount
-	// } else {
-	// 	// it wasn't attached so get it from the db instead
-	// 	if err := p.db.GetByID(status.AccountID, sendingAcct); err != nil {
-	// 		return err
-	// 	}
-	// }
+	asStatus, err := p.tc.StatusToAS(status)
+	if err != nil {
+		return fmt.Errorf("federateStatus: error converting status to as format: %s", err)
+	}
 
-	// outboxURI, err := url.Parse(sendingAcct.OutboxURI)
-	// if err != nil {
-	// 	return err
-	// }
+	outboxIRI, err := url.Parse(status.GTSAccount.OutboxURI)
+	if err != nil {
+		return fmt.Errorf("federateStatus: error parsing outboxURI %s: %s", status.GTSAccount.OutboxURI, err)
+	}
 
-	// // convert the status to AS format Note
-	// note, err := p.tc.StatusToAS(status)
-	// if err != nil {
-	// 	return err
-	// }
-
-	// _, err = p.federator.FederatingActor().Send(context.Background(), outboxURI, note)
-	return nil
+	_, err = p.federator.FederatingActor().Send(context.Background(), outboxIRI, asStatus)
+	return err
 }
 
 func (p *processor) federateFollow(follow *gtsmodel.Follow, originAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) error {

internal/message/processor.go

@@ -133,6 +133,14 @@ type Processor interface {
 	// before returning a JSON serializable interface to the caller.
 	GetFediUser(requestedUsername string, request *http.Request) (interface{}, ErrorWithCode)
 
+	// GetFediFollowers 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.
+	GetFediFollowers(requestedUsername string, request *http.Request) (interface{}, ErrorWithCode)
+
+	// GetFediStatus handles the getting of a fedi/activitypub representation of a particular status, performing appropriate
+	// authentication before returning a JSON serializable interface to the caller.
+	GetFediStatus(requestedUsername string, requestedStatusID string, request *http.Request) (interface{}, ErrorWithCode)
+
 	// GetWebfingerAccount handles the GET for a webfinger resource. Most commonly, it will be used for returning account lookups.
 	GetWebfingerAccount(requestedUsername string, request *http.Request) (*apimodel.WebfingerAccountResponse, ErrorWithCode)
 

internal/message/processorutil.go

@@ -206,7 +206,7 @@ func (p *processor) processMentions(form *apimodel.AdvancedStatusCreateForm, acc
 		if err := p.db.Put(menchie); err != nil {
 			return fmt.Errorf("error putting mentions in db: %s", err)
 		}
-		menchies = append(menchies, menchie.TargetAccountID)
+		menchies = append(menchies, menchie.ID)
 	}
 	// add full populated gts menchies to the status for passing them around conveniently
 	status.GTSMentions = gtsMenchies

internal/typeutils/converter.go

@@ -117,7 +117,11 @@ type TypeConverter interface {
 	// FollowToASFollow converts a gts model Follow into an activity streams Follow, suitable for federation
 	FollowToAS(f *gtsmodel.Follow, originAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (vocab.ActivityStreamsFollow, error)
 
+	// MentionToAS converts a gts model mention into an activity streams Mention, suitable for federation
 	MentionToAS(m *gtsmodel.Mention) (vocab.ActivityStreamsMention, error)
+
+	// AttachmentToAS converts a gts model media attachment into an activity streams Attachment, suitable for federation
+	AttachmentToAS(a *gtsmodel.MediaAttachment) (vocab.ActivityStreamsDocument, error)
 }
 
 type converter struct {

internal/typeutils/internaltoas.go

@@ -26,6 +26,7 @@ import (
 
 	"github.com/go-fed/activity/streams"
 	"github.com/go-fed/activity/streams/vocab"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
 
@@ -348,9 +349,10 @@ func (c *converter) StatusToAS(s *gtsmodel.Status) (vocab.ActivityStreamsNote, e
 	}
 
 	// tag -- emojis
+	// TODO
 
 	// tag -- hashtags
-
+	// TODO
 
 	status.SetActivityStreamsTag(tagProp)
 
@@ -365,27 +367,80 @@ func (c *converter) StatusToAS(s *gtsmodel.Status) (vocab.ActivityStreamsNote, e
 		return nil, fmt.Errorf("StatusToAS: error parsing url %s: %s", asPublicURI, err)
 	}
 
-	// to
+	// to and cc
+	toProp := streams.NewActivityStreamsToProperty()
+	ccProp := streams.NewActivityStreamsCcProperty()
 	switch s.Visibility {
 	case gtsmodel.VisibilityDirect:
+		// if DIRECT, then only mentioned users should be added to TO, and nothing to CC
+		for _, m := range s.GTSMentions {
+			iri, err := url.Parse(m.GTSAccount.URI)
+			if err != nil {
+				return nil, fmt.Errorf("StatusToAS: error parsing uri %s: %s", m.GTSAccount.URI, err)
 			}
-
-	// cc
+			toProp.AppendIRI(iri)
+		}
+	case gtsmodel.VisibilityMutualsOnly:
+		// TODO
+	case gtsmodel.VisibilityFollowersOnly:
+		// if FOLLOWERS ONLY then we want to add followers to TO, and mentions to CC
+		toProp.AppendIRI(authorFollowersURI)
+		for _, m := range s.GTSMentions {
+			iri, err := url.Parse(m.GTSAccount.URI)
+			if err != nil {
+				return nil, fmt.Errorf("StatusToAS: error parsing uri %s: %s", m.GTSAccount.URI, err)
+			}
+			ccProp.AppendIRI(iri)
+		}
+	case gtsmodel.VisibilityUnlocked:
+		// if UNLOCKED, we want to add followers to TO, and public and mentions to CC
+		toProp.AppendIRI(authorFollowersURI)
+		ccProp.AppendIRI(publicURI)
+		for _, m := range s.GTSMentions {
+			iri, err := url.Parse(m.GTSAccount.URI)
+			if err != nil {
+				return nil, fmt.Errorf("StatusToAS: error parsing uri %s: %s", m.GTSAccount.URI, err)
+			}
+			ccProp.AppendIRI(iri)
+		}
+	case gtsmodel.VisibilityPublic:
+		// if PUBLIC, we want to add public to TO, and followers and mentions to CC
+		toProp.AppendIRI(publicURI)
+		ccProp.AppendIRI(authorFollowersURI)
+		for _, m := range s.GTSMentions {
+			iri, err := url.Parse(m.GTSAccount.URI)
+			if err != nil {
+				return nil, fmt.Errorf("StatusToAS: error parsing uri %s: %s", m.GTSAccount.URI, err)
+			}
+			ccProp.AppendIRI(iri)
+		}
+	}
+	status.SetActivityStreamsTo(toProp)
+	status.SetActivityStreamsCc(ccProp)
 
 	// conversation
+	// TODO
 
-	// content
+	// content -- the actual post itself
+	contentProp := streams.NewActivityStreamsContentProperty()
+	contentProp.AppendXMLSchemaString(s.Content)
+	status.SetActivityStreamsContent(contentProp)
 
 	// attachment
-
-
-
-
+	attachmentProp := streams.NewActivityStreamsAttachmentProperty()
+	for _, a := range s.GTSMediaAttachments {
+		doc, err := c.AttachmentToAS(a)
+		if err != nil {
+			return nil, fmt.Errorf("StatusToAS: error converting attachment: %s", err)
+		}
+		attachmentProp.AppendActivityStreamsDocument(doc)
+	}
+	status.SetActivityStreamsAttachment(attachmentProp)
 
 	// replies
+	// TODO
 	
-
-	return nil, nil
+	return status, nil
 }
 
 func (c *converter) FollowToAS(f *gtsmodel.Follow, originAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (vocab.ActivityStreamsFollow, error) {
@@ -435,11 +490,72 @@ func (c *converter) FollowToAS(f *gtsmodel.Follow, originAccount *gtsmodel.Accou
 }
 
 func (c *converter) MentionToAS(m *gtsmodel.Mention) (vocab.ActivityStreamsMention, error) {
-	mention := streams.NewActivityStreamsMention()
-
-	if m.NameString == "" {
-		m.NameString = 
+	if m.GTSAccount == nil {
+		a := &gtsmodel.Account{}
+		if err := c.db.GetWhere([]db.Where{{Key: "target_account_id", Value: m.TargetAccountID}}, a); err != nil {
+			return nil, fmt.Errorf("MentionToAS: error getting target account from db: %s", err)
+		}
+		m.GTSAccount = a
 	}
 
+	// create the mention
+	mention := streams.NewActivityStreamsMention()
 
+	// href -- this should be the URI of the mentioned user
+	hrefProp := streams.NewActivityStreamsHrefProperty()
+	hrefURI, err := url.Parse(m.GTSAccount.URI)
+	if err != nil {
+		return nil, fmt.Errorf("MentionToAS: error parsing uri %s: %s", m.GTSAccount.URI, err)
+	}
+	hrefProp.SetIRI(hrefURI)
+	mention.SetActivityStreamsHref(hrefProp)
+
+	// name -- this should be the namestring of the mentioned user, something like @whatever@example.org
+	var domain string
+	if m.GTSAccount.Domain == "" {
+		domain = c.config.Host
+	} else {
+		domain = m.GTSAccount.Domain
+	}
+	username := m.GTSAccount.Username
+	nameString := fmt.Sprintf("@%s@%s", username, domain)
+	nameProp := streams.NewActivityStreamsNameProperty()
+	nameProp.AppendXMLSchemaString(nameString)
+	mention.SetActivityStreamsName(nameProp)
+
+	return mention, nil
+}
+
+func (c *converter) AttachmentToAS(a *gtsmodel.MediaAttachment) (vocab.ActivityStreamsDocument, error) {
+	// type -- Document
+	doc := streams.NewActivityStreamsDocument()
+
+	// mediaType aka mime content type
+	mediaTypeProp := streams.NewActivityStreamsMediaTypeProperty()
+	mediaTypeProp.Set(a.File.ContentType)
+	doc.SetActivityStreamsMediaType(mediaTypeProp)
+
+	// url -- for the original image not the thumbnail
+	urlProp := streams.NewActivityStreamsUrlProperty()
+	imageURL, err := url.Parse(a.URL)
+	if err != nil {
+		return nil, fmt.Errorf("AttachmentToAS: error parsing uri %s: %s", a.URL, err)
+	}
+	urlProp.AppendIRI(imageURL)
+	doc.SetActivityStreamsUrl(urlProp)
+
+	// name -- aka image description
+	nameProp := streams.NewActivityStreamsNameProperty()
+	nameProp.AppendXMLSchemaString(a.Description)
+	doc.SetActivityStreamsName(nameProp)
+
+	// blurhash
+	blurProp := streams.NewTootBlurhashProperty()
+	blurProp.Set(a.Blurhash)
+	doc.SetTootBlurhash(blurProp)
+
+	// focalpoint
+	// TODO
+
+	return doc, nil
 }