[bugfix] Normalize status content (don't parse status content as IRI) (#1665)

* start fannying about

* finish up Normalize

* tidy up

* pin to tag

* move errors about just a little bit

internal/federation/dereferencing/account.go

@@ -357,39 +357,13 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
 
 // dereferenceAccountable calls remoteAccountID with a GET request, and tries to parse whatever
 // it finds as something that an account model can be constructed out of.
-//
-// Will work for Person, Application, or Service models.
 func (d *deref) dereferenceAccountable(ctx context.Context, transport transport.Transport, remoteAccountID *url.URL) (ap.Accountable, error) {
 	b, err := transport.Dereference(ctx, remoteAccountID)
 	if err != nil {
-		return nil, fmt.Errorf("DereferenceAccountable: error deferencing %s: %w", remoteAccountID.String(), err)
+		return nil, fmt.Errorf("dereferenceAccountable: error deferencing %s: %w", remoteAccountID.String(), err)
 	}
 
-	m := make(map[string]interface{})
-	if err := json.Unmarshal(b, &m); err != nil {
-		return nil, fmt.Errorf("DereferenceAccountable: error unmarshalling bytes into json: %w", err)
-	}
-
-	t, err := streams.ToType(ctx, m)
-	if err != nil {
-		return nil, fmt.Errorf("DereferenceAccountable: error resolving json into ap vocab type: %w", err)
-	}
-
-	//nolint:forcetypeassert
-	switch t.GetTypeName() {
-	case ap.ActorApplication:
-		return t.(vocab.ActivityStreamsApplication), nil
-	case ap.ActorGroup:
-		return t.(vocab.ActivityStreamsGroup), nil
-	case ap.ActorOrganization:
-		return t.(vocab.ActivityStreamsOrganization), nil
-	case ap.ActorPerson:
-		return t.(vocab.ActivityStreamsPerson), nil
-	case ap.ActorService:
-		return t.(vocab.ActivityStreamsService), nil
-	}
-
-	return nil, newErrWrongType(fmt.Errorf("DereferenceAccountable: type name %s not supported as Accountable", t.GetTypeName()))
+	return ap.ResolveAccountable(ctx, b)
 }
 
 func (d *deref) fetchRemoteAccountAvatar(ctx context.Context, tsport transport.Transport, avatarURL string, accountID string) (string, error) {

internal/federation/dereferencing/error.go

@@ -66,20 +66,6 @@ func newErrTransportError(err error) error {
 	return &ErrTransportError{wrapped: err}
 }
 
-// ErrWrongType indicates that an unexpected type was returned from a remote call;
-// for example, we were served a Person when we were looking for a statusable.
-type ErrWrongType struct {
-	wrapped error
-}
-
-func (err *ErrWrongType) Error() string {
-	return fmt.Sprintf("wrong received type: %v", err.wrapped)
-}
-
-func newErrWrongType(err error) error {
-	return &ErrWrongType{wrapped: err}
-}
-
 // ErrOther denotes some other kind of weird error, perhaps from a malformed json
 // or some other weird crapola.
 type ErrOther struct {

internal/federation/dereferencing/status.go

@@ -19,14 +19,11 @@ package dereferencing
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"net/url"
 	"strings"
 
-	"github.com/superseriousbusiness/activity/streams"
-	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
@@ -161,78 +158,10 @@ func (d *deref) dereferenceStatusable(ctx context.Context, tsport transport.Tran
 
 	b, err := tsport.Dereference(ctx, remoteStatusID)
 	if err != nil {
-		return nil, fmt.Errorf("DereferenceStatusable: error deferencing %s: %s", remoteStatusID.String(), err)
+		return nil, fmt.Errorf("dereferenceStatusable: error deferencing %s: %w", remoteStatusID.String(), err)
 	}
 
-	m := make(map[string]interface{})
-	if err := json.Unmarshal(b, &m); err != nil {
-		return nil, fmt.Errorf("DereferenceStatusable: error unmarshalling bytes into json: %s", err)
-	}
-
-	t, err := streams.ToType(ctx, m)
-	if err != nil {
-		return nil, fmt.Errorf("DereferenceStatusable: error resolving json into ap vocab type: %s", err)
-	}
-
-	// Article, Document, Image, Video, Note, Page, Event, Place, Mention, Profile
-	switch t.GetTypeName() {
-	case ap.ObjectArticle:
-		p, ok := t.(vocab.ActivityStreamsArticle)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsArticle")
-		}
-		return p, nil
-	case ap.ObjectDocument:
-		p, ok := t.(vocab.ActivityStreamsDocument)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsDocument")
-		}
-		return p, nil
-	case ap.ObjectImage:
-		p, ok := t.(vocab.ActivityStreamsImage)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsImage")
-		}
-		return p, nil
-	case ap.ObjectVideo:
-		p, ok := t.(vocab.ActivityStreamsVideo)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsVideo")
-		}
-		return p, nil
-	case ap.ObjectNote:
-		p, ok := t.(vocab.ActivityStreamsNote)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsNote")
-		}
-		return p, nil
-	case ap.ObjectPage:
-		p, ok := t.(vocab.ActivityStreamsPage)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsPage")
-		}
-		return p, nil
-	case ap.ObjectEvent:
-		p, ok := t.(vocab.ActivityStreamsEvent)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsEvent")
-		}
-		return p, nil
-	case ap.ObjectPlace:
-		p, ok := t.(vocab.ActivityStreamsPlace)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsPlace")
-		}
-		return p, nil
-	case ap.ObjectProfile:
-		p, ok := t.(vocab.ActivityStreamsProfile)
-		if !ok {
-			return nil, errors.New("DereferenceStatusable: error resolving type as ActivityStreamsProfile")
-		}
-		return p, nil
-	}
-
-	return nil, newErrWrongType(fmt.Errorf("DereferenceStatusable: type name %s not supported as Statusable", t.GetTypeName()))
+	return ap.ResolveStatusable(ctx, b)
 }
 
 // populateStatusFields fetches all the information we temporarily pinned to an incoming