get remote follows/accepts working

internal/api/client/account/account.go

@@ -59,6 +59,8 @@ const (
 	GetFollowersPath = BasePathWithID + "/followers"
 	// GetRelationshipsPath is for showing an account's relationship with other accounts
 	GetRelationshipsPath = BasePath + "/relationships"
+	// FollowPath is for POSTing new follows to, and updating existing follows
+	PostFollowPath = BasePathWithID + "/follow"
 )
 
 // Module implements the ClientAPIModule interface for account-related actions
@@ -85,6 +87,7 @@ func (m *Module) Route(r router.Router) error {
 	r.AttachHandler(http.MethodGet, GetStatusesPath, m.AccountStatusesGETHandler)
 	r.AttachHandler(http.MethodGet, GetFollowersPath, m.AccountFollowersGETHandler)
 	r.AttachHandler(http.MethodGet, GetRelationshipsPath, m.AccountRelationshipsGETHandler)
+	r.AttachHandler(http.MethodPost, PostFollowPath, m.AccountFollowPOSTHandler)
 	return nil
 }
 

internal/api/client/account/follow.go

@@ -0,0 +1,56 @@
+/*
+   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 account
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// AccountFollowPOSTHandler is the endpoint for creating a new follow request to the target account
+func (m *Module) AccountFollowPOSTHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
+		return
+	}
+
+	targetAcctID := c.Param(IDKey)
+	if targetAcctID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no account id specified"})
+		return
+	}
+	form := &model.AccountFollowRequest{}
+	if err := c.ShouldBind(form); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	form.TargetAccountID = targetAcctID
+
+	relationship, errWithCode := m.processor.AccountFollowCreate(authed, form)
+	if errWithCode != nil {
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	c.JSON(http.StatusOK, relationship)
+}

internal/api/client/account/relationships.go

@@ -21,9 +21,14 @@ func (m *Module) AccountRelationshipsGETHandler(c *gin.Context) {
 
 	targetAccountIDs := c.QueryArray("id[]")
 	if len(targetAccountIDs) == 0 {
-		l.Debug("no account id specified in query")
-		c.JSON(http.StatusBadRequest, gin.H{"error": "no account id specified"})
-		return
+		// check fallback -- let's be generous and see if maybe it's just set as 'id'?
+		id := c.Query("id")
+		if id == "" {
+			l.Debug("no account id specified in query")
+			c.JSON(http.StatusBadRequest, gin.H{"error": "no account id specified"})
+			return
+		}
+		targetAccountIDs = append(targetAccountIDs, id)
 	}
 
 	relationships := []model.Relationship{}

internal/api/model/account.go

@@ -130,7 +130,18 @@ type UpdateSource struct {
 // By default, max 4 fields and 255 characters per property/value.
 type UpdateField struct {
 	// Name of the field
-	Name *string `form:"name"`
+	Name *string `form:"name" json:"name" xml:"name"`
 	// Value of the field
-	Value *string `form:"value"`
+	Value *string `form:"value" json:"value" xml:"value"`
+}
+
+// AccountFollowRequest is for parsing requests at /api/v1/accounts/:id/follow
+type AccountFollowRequest struct {
+	// ID of the account to follow request
+	// This should be a URL parameter not a form field
+	TargetAccountID string `form:"-"`
+	// Show reblogs for this account?
+	Reblogs *bool `form:"reblogs" json:"reblogs" xml:"reblogs"`
+	// Notify when this account posts?
+	Notify *bool `form:"notify" json:"notify" xml:"notify"`
 }

internal/db/db.go

@@ -32,11 +32,17 @@ const (
 
 // ErrNoEntries is to be returned from the DB interface when no entries are found for a given query.
 type ErrNoEntries struct{}
-
 func (e ErrNoEntries) Error() string {
 	return "no entries"
 }
 
+// ErrAlreadyExists is to be returned from the DB interface when an entry already exists for a given query or its constraints.
+type ErrAlreadyExists struct{}
+func (e ErrAlreadyExists) Error() string {
+	return "already exists"
+}
+
+
 // DB provides methods for interacting with an underlying database or other storage mechanism (for now, just postgres).
 // Note that in all of the functions below, the passed interface should be a pointer or a slice, which will then be populated
 // by whatever is returned from the database.
@@ -226,6 +232,9 @@ type DB interface {
 	// Follows returns true if sourceAccount follows target account, or an error if something goes wrong while finding out.
 	Follows(sourceAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (bool, error)
 
+	// FollowRequested returns true if sourceAccount has requested to follow target account, or an error if something goes wrong while finding out.
+	FollowRequested(sourceAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (bool, error)
+
 	// Mutuals returns true if account1 and account2 both follow each other, or an error if something goes wrong while finding out.
 	Mutuals(account1 *gtsmodel.Account, account2 *gtsmodel.Account) (bool, error)
 

internal/db/pg/pg.go

@@ -242,6 +242,9 @@ func (ps *postgresService) GetAll(i interface{}) error {
 
 func (ps *postgresService) Put(i interface{}) error {
 	_, err := ps.conn.Model(i).Insert(i)
+	if err != nil && strings.Contains(err.Error(), "duplicate key value violates unique constraint") {
+		return db.ErrAlreadyExists{}
+	}
 	return err
 }
 
@@ -900,6 +903,10 @@ func (ps *postgresService) Follows(sourceAccount *gtsmodel.Account, targetAccoun
 	return ps.conn.Model(&gtsmodel.Follow{}).Where("account_id = ?", sourceAccount.ID).Where("target_account_id = ?", targetAccount.ID).Exists()
 }
 
+func (ps *postgresService) FollowRequested(sourceAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (bool, error) {
+	return ps.conn.Model(&gtsmodel.FollowRequest{}).Where("account_id = ?", sourceAccount.ID).Where("target_account_id = ?", targetAccount.ID).Exists()
+}
+
 func (ps *postgresService) Mutuals(account1 *gtsmodel.Account, account2 *gtsmodel.Account) (bool, error) {
 	// make sure account 1 follows account 2
 	f1, err := ps.conn.Model(&gtsmodel.Follow{}).Where("account_id = ?", account1.ID).Where("target_account_id = ?", account2.ID).Exists()

internal/federation/federating_db.go

@@ -40,7 +40,8 @@ import (
 
 type FederatingDB interface {
 	pub.Database
-	Undo(c context.Context, asType vocab.Type) error
+	Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error
+	Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error
 }
 
 // FederatingDB uses the underlying DB interface to implement the go-fed pub.Database interface.
@@ -352,6 +353,7 @@ func (f *federatingDB) Get(c context.Context, id *url.URL) (value vocab.Type, er
 		if err := f.db.GetWhere("uri", id.String(), acct); err != nil {
 			return nil, err
 		}
+		l.Debug("is user path! returning account")
 		return f.typeConverter.AccountToAS(acct)
 	}
 
@@ -426,6 +428,9 @@ func (f *federatingDB) Create(ctx context.Context, asType vocab.Type) error {
 					return fmt.Errorf("error converting note to status: %s", err)
 				}
 				if err := f.db.Put(status); err != nil {
+					if _, ok := err.(db.ErrAlreadyExists); ok {
+						return nil
+					}
 					return fmt.Errorf("database error inserting status: %s", err)
 				}
 
@@ -461,98 +466,6 @@ func (f *federatingDB) Create(ctx context.Context, asType vocab.Type) error {
 	return nil
 }
 
-func (f *federatingDB) Undo(ctx context.Context, asType vocab.Type) error {
-	l := f.log.WithFields(
-		logrus.Fields{
-			"func":   "Undo",
-			"asType": asType.GetTypeName(),
-		},
-	)
-	m, err := streams.Serialize(asType)
-	if err != nil {
-		return err
-	}
-	b, err := json.Marshal(m)
-	if err != nil {
-		return err
-	}
-	l.Debugf("received UNDO asType %s", string(b))
-
-	targetAcctI := ctx.Value(util.APAccount)
-	if targetAcctI == nil {
-		l.Error("UNDO: target account wasn't set on context")
-		return nil
-	}
-	targetAcct, ok := targetAcctI.(*gtsmodel.Account)
-	if !ok {
-		l.Error("UNDO: target account was set on context but couldn't be parsed")
-		return nil
-	}
-
-	// fromFederatorChanI := ctx.Value(util.APFromFederatorChanKey)
-	// if fromFederatorChanI == nil {
-	// 	l.Error("from federator channel wasn't set on context")
-	// 	return nil
-	// }
-	// fromFederatorChan, ok := fromFederatorChanI.(chan gtsmodel.FromFederator)
-	// if !ok {
-	// 	l.Error("from federator channel was set on context but couldn't be parsed")
-	// 	return nil
-	// }
-
-	switch asType.GetTypeName() {
-	// UNDO
-	case gtsmodel.ActivityStreamsUndo:
-		undo, ok := asType.(vocab.ActivityStreamsUndo)
-		if !ok {
-			return errors.New("UNDO: couldn't parse UNDO into vocab.ActivityStreamsUndo")
-		}
-		undoObject := undo.GetActivityStreamsObject()
-		if undoObject == nil {
-			return errors.New("UNDO: no object set on vocab.ActivityStreamsUndo")
-		}
-
-		for iter := undoObject.Begin(); iter != undoObject.End(); iter = iter.Next() {
-			switch iter.GetType().GetTypeName() {
-			case string(gtsmodel.ActivityStreamsFollow):
-				// UNDO FOLLOW
-				ASFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
-				if !ok {
-					return errors.New("UNDO: couldn't parse follow into vocab.ActivityStreamsFollow")
-				}
-				// make sure the actor owns the follow
-				if !sameActor(undo.GetActivityStreamsActor(), ASFollow.GetActivityStreamsActor()) {
-					return errors.New("UNDO: follow actor and activity actor not the same")
-				}
-				// convert the follow to something we can understand
-				gtsFollow, err := f.typeConverter.ASFollowToFollow(ASFollow)
-				if err != nil {
-					return fmt.Errorf("UNDO: error converting asfollow to gtsfollow: %s", err)
-				}
-				// make sure the addressee of the original follow is the same as whatever inbox this landed in
-				if gtsFollow.TargetAccountID != targetAcct.ID {
-					return errors.New("UNDO: follow object account and inbox account were not the same")
-				}
-				// delete any existing FOLLOW
-				if err := f.db.DeleteWhere("uri", gtsFollow.URI, &gtsmodel.Follow{}); err != nil {
-					return fmt.Errorf("UNDO: db error removing follow: %s", err)
-				}
-				// delete any existing FOLLOW REQUEST
-				if err := f.db.DeleteWhere("uri", gtsFollow.URI, &gtsmodel.FollowRequest{}); err != nil {
-					return fmt.Errorf("UNDO: db error removing follow request: %s", err)
-				}
-				l.Debug("follow undone")
-				return nil
-			case string(gtsmodel.ActivityStreamsLike):
-				// UNDO LIKE
-			case string(gtsmodel.ActivityStreamsAnnounce):
-				// UNDO BOOST/REBLOG/ANNOUNCE
-			}
-		}
-	}
-	return nil
-}
-
 // Update sets an existing entry to the database based on the value's
 // id.
 //
@@ -715,9 +628,38 @@ func (f *federatingDB) NewID(c context.Context, t vocab.Type) (id *url.URL, err
 	if err != nil {
 		return nil, err
 	}
-
 	l.Debugf("received NEWID request for asType %s", string(b))
 
+	switch t.GetTypeName() {
+	case gtsmodel.ActivityStreamsFollow:
+		// FOLLOW
+		// ID might already be set on a follow we've created, so check it here and return it if it is
+		follow, ok := t.(vocab.ActivityStreamsFollow)
+		if !ok {
+			return nil, errors.New("newid: follow couldn't be parsed into vocab.ActivityStreamsFollow")
+		}
+		idProp := follow.GetJSONLDId()
+		if idProp != nil {
+			if idProp.IsIRI() {
+				return idProp.GetIRI(), nil
+			}
+		}
+		// it's not set so create one based on the actor set on the follow (ie., the followER not the followEE)
+		actorProp := follow.GetActivityStreamsActor()
+		if actorProp != nil {
+			for iter := actorProp.Begin(); iter != actorProp.End(); iter = iter.Next() {
+				// take the IRI of the first actor we can find (there should only be one)
+				if iter.IsIRI() {
+					actorAccount := &gtsmodel.Account{}
+					if err := f.db.GetWhere("uri", iter.GetIRI().String(), actorAccount); err == nil { // if there's an error here, just use the fallback behavior -- we don't need to return an error here
+						return url.Parse(util.GenerateURIForFollow(actorAccount.Username, f.config.Protocol, f.config.Host))
+					}
+				}
+			}
+		}
+	}
+
+	// fallback default behavior: just return a random UUID after our protocol and host
 	return url.Parse(fmt.Sprintf("%s://%s/%s", f.config.Protocol, f.config.Host, uuid.NewString()))
 }
 
@@ -821,3 +763,139 @@ func (f *federatingDB) Liked(c context.Context, actorIRI *url.URL) (liked vocab.
 	l.Debugf("entering LIKED function with actorIRI %s", actorIRI.String())
 	return nil, nil
 }
+
+/*
+	CUSTOM FUNCTIONALITY FOR GTS
+*/
+
+func (f *federatingDB) Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Undo",
+			"asType": undo.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(undo)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	l.Debugf("received UNDO asType %s", string(b))
+
+	targetAcctI := ctx.Value(util.APAccount)
+	if targetAcctI == nil {
+		l.Error("UNDO: target account wasn't set on context")
+		return nil
+	}
+	targetAcct, ok := targetAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("UNDO: target account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	undoObject := undo.GetActivityStreamsObject()
+	if undoObject == nil {
+		return errors.New("UNDO: no object set on vocab.ActivityStreamsUndo")
+	}
+
+	for iter := undoObject.Begin(); iter != undoObject.End(); iter = iter.Next() {
+		switch iter.GetType().GetTypeName() {
+		case string(gtsmodel.ActivityStreamsFollow):
+			// UNDO FOLLOW
+			ASFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
+			if !ok {
+				return errors.New("UNDO: couldn't parse follow into vocab.ActivityStreamsFollow")
+			}
+			// make sure the actor owns the follow
+			if !sameActor(undo.GetActivityStreamsActor(), ASFollow.GetActivityStreamsActor()) {
+				return errors.New("UNDO: follow actor and activity actor not the same")
+			}
+			// convert the follow to something we can understand
+			gtsFollow, err := f.typeConverter.ASFollowToFollow(ASFollow)
+			if err != nil {
+				return fmt.Errorf("UNDO: error converting asfollow to gtsfollow: %s", err)
+			}
+			// make sure the addressee of the original follow is the same as whatever inbox this landed in
+			if gtsFollow.TargetAccountID != targetAcct.ID {
+				return errors.New("UNDO: follow object account and inbox account were not the same")
+			}
+			// delete any existing FOLLOW
+			if err := f.db.DeleteWhere("uri", gtsFollow.URI, &gtsmodel.Follow{}); err != nil {
+				return fmt.Errorf("UNDO: db error removing follow: %s", err)
+			}
+			// delete any existing FOLLOW REQUEST
+			if err := f.db.DeleteWhere("uri", gtsFollow.URI, &gtsmodel.FollowRequest{}); err != nil {
+				return fmt.Errorf("UNDO: db error removing follow request: %s", err)
+			}
+			l.Debug("follow undone")
+			return nil
+		case string(gtsmodel.ActivityStreamsLike):
+			// UNDO LIKE
+		case string(gtsmodel.ActivityStreamsAnnounce):
+			// UNDO BOOST/REBLOG/ANNOUNCE
+		}
+	}
+
+	return nil
+}
+
+func (f *federatingDB) Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Accept",
+			"asType": accept.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(accept)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	l.Debugf("received ACCEPT asType %s", string(b))
+
+	inboxAcctI := ctx.Value(util.APAccount)
+	if inboxAcctI == nil {
+		l.Error("ACCEPT: inbox account wasn't set on context")
+		return nil
+	}
+	inboxAcct, ok := inboxAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("ACCEPT: inbox account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	acceptObject := accept.GetActivityStreamsObject()
+	if acceptObject == nil {
+		return errors.New("ACCEPT: no object set on vocab.ActivityStreamsUndo")
+	}
+
+	for iter := acceptObject.Begin(); iter != acceptObject.End(); iter = iter.Next() {
+		switch iter.GetType().GetTypeName() {
+		case string(gtsmodel.ActivityStreamsFollow):
+			// ACCEPT FOLLOW
+			asFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
+			if !ok {
+				return errors.New("ACCEPT: couldn't parse follow into vocab.ActivityStreamsFollow")
+			}
+			// convert the follow to something we can understand
+			gtsFollow, err := f.typeConverter.ASFollowToFollow(asFollow)
+			if err != nil {
+				return fmt.Errorf("ACCEPT: error converting asfollow to gtsfollow: %s", err)
+			}
+			// make sure the addressee of the original follow is the same as whatever inbox this landed in
+			if gtsFollow.AccountID != inboxAcct.ID {
+				return errors.New("ACCEPT: follow object account and inbox account were not the same")
+			}
+			_, err = f.db.AcceptFollowRequest(gtsFollow.AccountID, gtsFollow.TargetAccountID)
+			return err
+		}
+	}
+
+	return nil
+}

internal/federation/federatingprotocol.go

@@ -266,11 +266,15 @@ func (f *federator) FederatingCallbacks(ctx context.Context) (wrapped pub.Federa
 		OnFollow: onFollow,
 	}
 
-	// override default undo behavior
 	other = []interface{}{
+		// override default undo behavior
 		func(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
 			return f.FederatingDB().Undo(ctx, undo)
 		},
+		// override default accept behavior
+		func(ctx context.Context, accept vocab.ActivityStreamsAccept) error {
+			return f.FederatingDB().Accept(ctx, accept)
+		},
 	}
 
 	return

internal/gtsmodel/messages.go

@@ -12,6 +12,8 @@ type FromClientAPI struct {
 	APObjectType   string
 	APActivityType string
 	GTSModel       interface{}
+	OriginAccount  *Account
+	TargetAccount  *Account
 }
 
 // // ToFederator wraps a message that travels from the processor into the federator

internal/message/accountprocess.go

@@ -326,3 +326,87 @@ func (p *processor) AccountRelationshipGet(authed *oauth.Auth, targetAccountID s
 
 	return r, nil
 }
+
+func (p *processor) AccountFollowCreate(authed *oauth.Auth, form *apimodel.AccountFollowRequest) (*apimodel.Relationship, ErrorWithCode) {
+	// if there's a block between the accounts we shouldn't create the request ofc
+	blocked, err := p.db.Blocked(authed.Account.ID, form.TargetAccountID)
+	if err != nil {
+		return nil, NewErrorInternalError(err)
+	}
+	if blocked {
+		return nil, NewErrorNotFound(fmt.Errorf("accountfollowcreate: block exists between accounts"))
+	}
+
+	// make sure the target account actually exists in our db
+	targetAcct := &gtsmodel.Account{}
+	if err := p.db.GetByID(form.TargetAccountID, targetAcct); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			return nil, NewErrorNotFound(fmt.Errorf("accountfollowcreate: account %s not found in the db: %s", form.TargetAccountID, err))
+		}
+	}
+
+	// check if a follow exists already
+	follows, err := p.db.Follows(authed.Account, targetAcct)
+	if err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("accountfollowcreate: error checking follow in db: %s", err))
+	}
+	if follows {
+		// already follows so just return the relationship
+		return p.AccountRelationshipGet(authed, form.TargetAccountID)
+	}
+
+	// check if a follow exists already
+	followRequested, err := p.db.FollowRequested(authed.Account, targetAcct)
+	if err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("accountfollowcreate: error checking follow request in db: %s", err))
+	}
+	if followRequested {
+		// already follow requested so just return the relationship
+		return p.AccountRelationshipGet(authed, form.TargetAccountID)
+	}
+
+	// make the follow request
+	fr := &gtsmodel.FollowRequest{
+		AccountID:       authed.Account.ID,
+		TargetAccountID: form.TargetAccountID,
+		ShowReblogs:     true,
+		URI:             util.GenerateURIForFollow(authed.Account.Username, p.config.Protocol, p.config.Host),
+		Notify:          false,
+	}
+	if form.Reblogs != nil {
+		fr.ShowReblogs = *form.Reblogs
+	}
+	if form.Notify != nil {
+		fr.Notify = *form.Notify
+	}
+
+	// whack it in the database
+	if err := p.db.Put(fr); err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("accountfollowcreate: error creating follow request in db: %s", err))
+	}
+
+	// if it's a local account that's not locked we can just straight up accept the follow request
+	if !targetAcct.Locked && targetAcct.Domain == "" {
+		if _, err := p.db.AcceptFollowRequest(authed.Account.ID, form.TargetAccountID); err != nil {
+			return nil, NewErrorInternalError(fmt.Errorf("accountfollowcreate: error accepting folow request for local unlocked account: %s", err))
+		}
+		// return the new relationship
+		return p.AccountRelationshipGet(authed, form.TargetAccountID)
+	}
+
+	// otherwise we leave the follow request as it is and we handle the rest of the process asynchronously
+	p.fromClientAPI <- gtsmodel.FromClientAPI{
+		APObjectType:   gtsmodel.ActivityStreamsFollow,
+		APActivityType: gtsmodel.ActivityStreamsCreate,
+		GTSModel: &gtsmodel.Follow{
+			AccountID:       authed.Account.ID,
+			TargetAccountID: form.TargetAccountID,
+			URI:             fr.URI,
+		},
+		OriginAccount: authed.Account,
+		TargetAccount: targetAcct,
+	}
+
+	// return whatever relationship results from this
+	return p.AccountRelationshipGet(authed, form.TargetAccountID)
+}

internal/message/fromclientapiprocess.go

@@ -49,6 +49,18 @@ func (p *processor) processFromClientAPI(clientMsg gtsmodel.FromClientAPI) error
 				return p.federateStatus(status)
 			}
 			return nil
+		case gtsmodel.ActivityStreamsFollow:
+			// CREATE FOLLOW (request)
+			follow, ok := clientMsg.GTSModel.(*gtsmodel.Follow)
+			if !ok {
+				return errors.New("follow was not parseable as *gtsmodel.Follow")
+			}
+
+			if err := p.notifyFollow(follow); err != nil {
+				return err
+			}
+
+			return p.federateFollow(follow, clientMsg.OriginAccount, clientMsg.TargetAccount)
 		}
 	case gtsmodel.ActivityStreamsUpdate:
 		// UPDATE
@@ -90,8 +102,26 @@ func (p *processor) federateStatus(status *gtsmodel.Status) error {
 	return nil
 }
 
+func (p *processor) federateFollow(follow *gtsmodel.Follow, originAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) error {
+	asFollow, err := p.tc.FollowToAS(follow, originAccount, targetAccount)
+	if err != nil {
+		return fmt.Errorf("federateFollow: error converting follow to as format: %s", err)
+	}
+
+	outboxIRI, err := url.Parse(originAccount.OutboxURI)
+	if err != nil {
+		return fmt.Errorf("federateFollow: error parsing outboxURI %s: %s", originAccount.OutboxURI, err)
+	}
+
+	_, err = p.federator.FederatingActor().Send(context.Background(), outboxIRI, asFollow)
+	return err
+}
+
 func (p *processor) federateAcceptFollowRequest(follow *gtsmodel.Follow) error {
 
+	// TODO: tidy up this whole function -- move most of the logic for the conversion to the type converter because this is just a mess! Shame on me!
+
+
 	followAccepter := &gtsmodel.Account{}
 	if err := p.db.GetByID(follow.TargetAccountID, followAccepter); err != nil {
 		return fmt.Errorf("error federating follow accept: %s", err)

internal/message/fromcommonprocess.go

@@ -23,3 +23,7 @@ import "github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 func (p *processor) notifyStatus(status *gtsmodel.Status) error {
 	return nil
 }
+
+func (p *processor) notifyFollow(follow *gtsmodel.Follow) error {
+   return nil
+}

internal/message/processor.go

@@ -71,10 +71,12 @@ type Processor interface {
 	// AccountStatusesGet fetches a number of statuses (in time descending order) from the given account, filtered by visibility for
 	// the account given in authed.
 	AccountStatusesGet(authed *oauth.Auth, targetAccountID string, limit int, excludeReplies bool, maxID string, pinned bool, mediaOnly bool) ([]apimodel.Status, ErrorWithCode)
-	// AccountFollowersGet
+	// AccountFollowersGet fetches a list of the target account's followers.
 	AccountFollowersGet(authed *oauth.Auth, targetAccountID string) ([]apimodel.Account, ErrorWithCode)
-	// AccountRelationshipGet
+	// AccountRelationshipGet returns a relationship model describing the relationship of the targetAccount to the Authed account.
 	AccountRelationshipGet(authed *oauth.Auth, targetAccountID string) (*apimodel.Relationship, ErrorWithCode)
+	// AccountFollowCreate handles a follow request to an account, either remote or local.
+	AccountFollowCreate(authed *oauth.Auth, form *apimodel.AccountFollowRequest) (*apimodel.Relationship, ErrorWithCode)
 
 	// AdminEmojiCreate handles the creation of a new instance emoji by an admin, using the given form.
 	AdminEmojiCreate(authed *oauth.Auth, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, error)

internal/typeutils/converter.go

@@ -99,7 +99,7 @@ type TypeConverter interface {
 	ASFollowToFollowRequest(followable Followable) (*gtsmodel.FollowRequest, error)
 	// ASFollowToFollowRequest converts a remote activitystreams `follow` representation into gts model follow.
 	ASFollowToFollow(followable Followable) (*gtsmodel.Follow, error)
-	
+
 	/*
 		INTERNAL (gts) MODEL TO ACTIVITYSTREAMS MODEL
 	*/
@@ -109,6 +109,9 @@ type TypeConverter interface {
 
 	// StatusToAS converts a gts model status into an activity streams note, suitable for federation
 	StatusToAS(s *gtsmodel.Status) (vocab.ActivityStreamsNote, error)
+
+	// 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)
 }
 
 type converter struct {

internal/typeutils/internaltoas.go

@@ -21,6 +21,7 @@ package typeutils
 import (
 	"crypto/x509"
 	"encoding/pem"
+	"fmt"
 	"net/url"
 
 	"github.com/go-fed/activity/streams"
@@ -258,3 +259,49 @@ func (c *converter) AccountToAS(a *gtsmodel.Account) (vocab.ActivityStreamsPerso
 func (c *converter) StatusToAS(s *gtsmodel.Status) (vocab.ActivityStreamsNote, error) {
 	return nil, nil
 }
+
+func (c *converter) FollowToAS(f *gtsmodel.Follow, originAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) (vocab.ActivityStreamsFollow, error) {
+	// parse out the various URIs we need for this
+	// origin account (who's doing the follow)
+	originAccountURI, err := url.Parse(originAccount.URI)
+	if err != nil {
+		return nil, fmt.Errorf("followtoasfollow: error parsing origin account uri: %s", err)
+	}
+	originActor := streams.NewActivityStreamsActorProperty()
+	originActor.AppendIRI(originAccountURI)
+
+	// target account (who's being followed)
+	targetAccountURI, err := url.Parse(targetAccount.URI)
+	if err != nil {
+		return nil, fmt.Errorf("followtoasfollow: error parsing target account uri: %s", err)
+	}
+
+	// uri of the folow activity itself
+	followURI, err := url.Parse(f.URI)
+	if err != nil {
+		return nil, fmt.Errorf("followtoasfollow: error parsing follow uri: %s", err)
+	}
+
+	// start preparing the follow activity
+	follow := streams.NewActivityStreamsFollow()
+
+	// set the actor
+	follow.SetActivityStreamsActor(originActor)
+
+	// set the id
+	followIDProp := streams.NewJSONLDIdProperty()
+	followIDProp.SetIRI(followURI)
+	follow.SetJSONLDId(followIDProp)
+
+	// set the object
+	followObjectProp := streams.NewActivityStreamsObjectProperty()
+	followObjectProp.AppendIRI(targetAccountURI)
+	follow.SetActivityStreamsObject(followObjectProp)
+
+	// set the To property
+	followToProp := streams.NewActivityStreamsToProperty()
+	followToProp.AppendIRI(targetAccountURI)
+	follow.SetActivityStreamsTo(followToProp)
+
+	return follow, nil
+}

internal/util/uri.go

@@ -22,6 +22,8 @@ import (
 	"fmt"
 	"net/url"
 	"strings"
+
+	"github.com/google/uuid"
 )
 
 const (
@@ -47,6 +49,8 @@ const (
 	FeaturedPath = "featured"
 	// PublicKeyPath is for serving an account's public key
 	PublicKeyPath = "main-key"
+	// FollowPath used to generate the URI for an individual follow or follow request
+	FollowPath = "follow"
 )
 
 // APContextKey is a type used specifically for settings values on contexts within go-fed AP request chains
@@ -103,6 +107,12 @@ type UserURIs struct {
 	PublicKeyURI string
 }
 
+// GenerateURIForFollow returns the AP URI for a new follow -- something like:
+// https://example.org/users/whatever_user/follow/41c7f33f-1060-48d9-84df-38dcb13cf0d8
+func GenerateURIForFollow(username string, protocol string, host string) string {
+	return fmt.Sprintf("%s://%s/%s/%s/%s", protocol, host, UsersPath, FollowPath, uuid.NewString())
+}
+
 // GenerateURIsForAccount throws together a bunch of URIs for the given username, with the given protocol and host.
 func GenerateURIsForAccount(username string, protocol string, host string) *UserURIs {
 	// The below URLs are used for serving web requests