[feature] Federate reports to remote instance as Flag (if desired) (#1386)

* reports federate out, we did it lxds

* fix optional line start (should be optional slash)

internal/ap/extract.go

@@ -621,7 +621,7 @@ func ExtractActor(i WithActor) (*url.URL, error) {
 	return nil, errors.New("no iri found for actor prop")
 }
 
-// ExtractObject extracts a URL object from a WithObject interface.
+// ExtractObject extracts the first URL object from a WithObject interface.
 func ExtractObject(i WithObject) (*url.URL, error) {
 	objectProp := i.GetActivityStreamsObject()
 	if objectProp == nil {

internal/federation/federatingdb/get.go

@@ -20,7 +20,7 @@ package federatingdb
 
 import (
 	"context"
-	"errors"
+	"fmt"
 	"net/url"
 
 	"codeberg.org/gruf/go-kv"
@@ -33,34 +33,27 @@ import (
 //
 // The library makes this call only after acquiring a lock first.
 func (f *federatingDB) Get(ctx context.Context, id *url.URL) (value vocab.Type, err error) {
-	l := log.WithFields(kv.Fields{
+	l := log.WithFields(kv.Fields{{"id", id}}...)
-		{"id", id},
-	}...)
 	l.Debug("entering Get")
 
-	if uris.IsUserPath(id) {
+	switch {
+	case uris.IsUserPath(id):
 		acct, err := f.db.GetAccountByURI(ctx, id.String())
 		if err != nil {
 			return nil, err
 		}
 		return f.typeConverter.AccountToAS(ctx, acct)
-	}
+	case uris.IsStatusesPath(id):
-
-	if uris.IsStatusesPath(id) {
 		status, err := f.db.GetStatusByURI(ctx, id.String())
 		if err != nil {
 			return nil, err
 		}
 		return f.typeConverter.StatusToAS(ctx, status)
-	}
+	case uris.IsFollowersPath(id):
-
-	if uris.IsFollowersPath(id) {
 		return f.Followers(ctx, id)
-	}
+	case uris.IsFollowingPath(id):
-
-	if uris.IsFollowingPath(id) {
 		return f.Following(ctx, id)
+	default:
+		return nil, fmt.Errorf("federatingDB: could not Get %s", id.String())
 	}
-
-	return nil, errors.New("could not get")
 }

internal/federation/federatingdb/util.go

@@ -229,60 +229,56 @@ func (f *federatingDB) ActorForInbox(ctx context.Context, inboxIRI *url.URL) (ac
 }
 
 // getAccountForIRI returns the account that corresponds to or owns the given IRI.
-func (f *federatingDB) getAccountForIRI(ctx context.Context, iri *url.URL) (account *gtsmodel.Account, err error) {
+func (f *federatingDB) getAccountForIRI(ctx context.Context, iri *url.URL) (*gtsmodel.Account, error) {
-	acct := &gtsmodel.Account{}
+	var (
+		acct = &gtsmodel.Account{}
+		err  error
+	)
 
-	if uris.IsInboxPath(iri) {
+	switch {
-		if err := f.db.GetWhere(ctx, []db.Where{{Key: "inbox_uri", Value: iri.String()}}, acct); err != nil {
+	case uris.IsUserPath(iri):
-			if err == db.ErrNoEntries {
+		if acct, err = f.db.GetAccountByURI(ctx, iri.String()); err != nil {
-				return nil, fmt.Errorf("no actor found that corresponds to inbox %s", iri.String())
-			}
-			return nil, fmt.Errorf("db error searching for actor with inbox %s", iri.String())
-		}
-		return acct, nil
-	}
-
-	if uris.IsOutboxPath(iri) {
-		if err := f.db.GetWhere(ctx, []db.Where{{Key: "outbox_uri", Value: iri.String()}}, acct); err != nil {
-			if err == db.ErrNoEntries {
-				return nil, fmt.Errorf("no actor found that corresponds to outbox %s", iri.String())
-			}
-			return nil, fmt.Errorf("db error searching for actor with outbox %s", iri.String())
-		}
-		return acct, nil
-	}
-
-	if uris.IsUserPath(iri) {
-		if err := f.db.GetWhere(ctx, []db.Where{{Key: "uri", Value: iri.String()}}, acct); err != nil {
 			if err == db.ErrNoEntries {
 				return nil, fmt.Errorf("no actor found that corresponds to uri %s", iri.String())
 			}
 			return nil, fmt.Errorf("db error searching for actor with uri %s", iri.String())
 		}
 		return acct, nil
-	}
+	case uris.IsInboxPath(iri):
-
+		if err = f.db.GetWhere(ctx, []db.Where{{Key: "inbox_uri", Value: iri.String()}}, acct); err != nil {
-	if uris.IsFollowersPath(iri) {
+			if err == db.ErrNoEntries {
-		if err := f.db.GetWhere(ctx, []db.Where{{Key: "followers_uri", Value: iri.String()}}, acct); err != nil {
+				return nil, fmt.Errorf("no actor found that corresponds to inbox %s", iri.String())
+			}
+			return nil, fmt.Errorf("db error searching for actor with inbox %s", iri.String())
+		}
+		return acct, nil
+	case uris.IsOutboxPath(iri):
+		if err = f.db.GetWhere(ctx, []db.Where{{Key: "outbox_uri", Value: iri.String()}}, acct); err != nil {
+			if err == db.ErrNoEntries {
+				return nil, fmt.Errorf("no actor found that corresponds to outbox %s", iri.String())
+			}
+			return nil, fmt.Errorf("db error searching for actor with outbox %s", iri.String())
+		}
+		return acct, nil
+	case uris.IsFollowersPath(iri):
+		if err = f.db.GetWhere(ctx, []db.Where{{Key: "followers_uri", Value: iri.String()}}, acct); err != nil {
 			if err == db.ErrNoEntries {
 				return nil, fmt.Errorf("no actor found that corresponds to followers_uri %s", iri.String())
 			}
 			return nil, fmt.Errorf("db error searching for actor with followers_uri %s", iri.String())
 		}
 		return acct, nil
-	}
+	case uris.IsFollowingPath(iri):
-
+		if err = f.db.GetWhere(ctx, []db.Where{{Key: "following_uri", Value: iri.String()}}, acct); err != nil {
-	if uris.IsFollowingPath(iri) {
-		if err := f.db.GetWhere(ctx, []db.Where{{Key: "following_uri", Value: iri.String()}}, acct); err != nil {
 			if err == db.ErrNoEntries {
 				return nil, fmt.Errorf("no actor found that corresponds to following_uri %s", iri.String())
 			}
 			return nil, fmt.Errorf("db error searching for actor with following_uri %s", iri.String())
 		}
 		return acct, nil
+	default:
+		return nil, fmt.Errorf("getActorForIRI: iri %s not recognised", iri)
 	}
-
-	return nil, fmt.Errorf("getActorForIRI: iri %s not recognised", iri)
 }
 
 // collectFollows takes a slice of iris and converts them into ActivityStreamsCollection of IRIs.

internal/processing/fromclientapi.go

@@ -345,10 +345,19 @@ func (p *processor) processDeleteAccountFromClientAPI(ctx context.Context, clien
 }
 
 func (p *processor) processReportAccountFromClientAPI(ctx context.Context, clientMsg messages.FromClientAPI) error {
-	// TODO: in a separate PR, handle side effects of flag/report
+	report, ok := clientMsg.GTSModel.(*gtsmodel.Report)
-	// 1. email admin(s)
+	if !ok {
-	// 2. federate report if necessary
+		return errors.New("report was not parseable as *gtsmodel.Report")
-	return nil
+	}
+
+	// TODO: in a separate PR, also email admin(s)
+
+	if !*report.Forwarded {
+		// nothing to do, don't federate the report
+		return nil
+	}
+
+	return p.federateReport(ctx, report)
 }
 
 // TODO: move all the below functions into federation.Federator
@@ -922,3 +931,51 @@ func (p *processor) federateUnblock(ctx context.Context, block *gtsmodel.Block)
 	_, err = p.federator.FederatingActor().Send(ctx, outboxIRI, undo)
 	return err
 }
+
+func (p *processor) federateReport(ctx context.Context, report *gtsmodel.Report) error {
+	if report.TargetAccount == nil {
+		reportTargetAccount, err := p.db.GetAccountByID(ctx, report.TargetAccountID)
+		if err != nil {
+			return fmt.Errorf("federateReport: error getting report target account from database: %w", err)
+		}
+		report.TargetAccount = reportTargetAccount
+	}
+
+	if len(report.StatusIDs) > 0 && len(report.Statuses) == 0 {
+		statuses, err := p.db.GetStatuses(ctx, report.StatusIDs)
+		if err != nil {
+			return fmt.Errorf("federateReport: error getting report statuses from database: %w", err)
+		}
+		report.Statuses = statuses
+	}
+
+	flag, err := p.tc.ReportToASFlag(ctx, report)
+	if err != nil {
+		return fmt.Errorf("federateReport: error converting report to AS flag: %w", err)
+	}
+
+	// add bto so that our federating actor knows where to
+	// send the Flag; it'll still use a shared inbox if possible
+	reportTargetURI, err := url.Parse(report.TargetAccount.URI)
+	if err != nil {
+		return fmt.Errorf("federateReport: error parsing outboxURI %s: %w", report.TargetAccount.URI, err)
+	}
+	bTo := streams.NewActivityStreamsBtoProperty()
+	bTo.AppendIRI(reportTargetURI)
+	flag.SetActivityStreamsBto(bTo)
+
+	// deliver the flag using the outbox of the
+	// instance account to anonymize the report
+	instanceAccount, err := p.db.GetInstanceAccount(ctx, "")
+	if err != nil {
+		return fmt.Errorf("federateReport: error getting instance account: %w", err)
+	}
+
+	outboxIRI, err := url.Parse(instanceAccount.OutboxURI)
+	if err != nil {
+		return fmt.Errorf("federateReport: error parsing outboxURI %s: %w", instanceAccount.OutboxURI, err)
+	}
+
+	_, err = p.federator.FederatingActor().Send(ctx, outboxIRI, flag)
+	return err
+}

internal/processing/report/create.go

@@ -91,6 +91,7 @@ func (p *processor) Create(ctx context.Context, account *gtsmodel.Account, form
 		APActivityType: ap.ActivityFlag,
 		GTSModel:       report,
 		OriginAccount:  account,
+		TargetAccount:  targetAccount,
 	})
 
 	apiReport, err := p.tc.ReportToAPIReport(ctx, report)

internal/regexes/regexes.go

@@ -77,40 +77,45 @@ var (
 	// EmojiFinder extracts emoji strings from a piece of text.
 	EmojiFinder = regexp.MustCompile(emojiFinderString)
 
-	// usernameString defines an acceptable username on this instance
+	// usernameString defines an acceptable username for a new account on this instance
 	usernameString = fmt.Sprintf(`[a-z0-9_]{2,%d}`, maximumUsernameLength)
 	// Username can be used to validate usernames of new signups
 	Username = regexp.MustCompile(fmt.Sprintf(`^%s$`, usernameString))
 
-	userPathString = fmt.Sprintf(`^?/%s/(%s)$`, users, usernameString)
+	// usernameStringRelaxed is like usernameString, but also allows the '.' character,
+	// so it can also be used to match the instance account, which will have a username
+	// like 'example.org', and it has no upper length limit, so will work for long domains.
+	usernameStringRelaxed = `[a-z0-9_\.]{2,}`
+
+	userPathString = fmt.Sprintf(`^/?%s/(%s)$`, users, usernameStringRelaxed)
 	// UserPath parses a path that validates and captures the username part from eg /users/example_username
 	UserPath = regexp.MustCompile(userPathString)
 
-	publicKeyPath = fmt.Sprintf(`^?/%s/(%s)/%s`, users, usernameString, publicKey)
+	publicKeyPath = fmt.Sprintf(`^/?%s/(%s)/%s`, users, usernameStringRelaxed, publicKey)
 	// PublicKeyPath parses a path that validates and captures the username part from eg /users/example_username/main-key
 	PublicKeyPath = regexp.MustCompile(publicKeyPath)
 
-	inboxPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameString, inbox)
+	inboxPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameStringRelaxed, inbox)
 	// InboxPath parses a path that validates and captures the username part from eg /users/example_username/inbox
 	InboxPath = regexp.MustCompile(inboxPath)
 
-	outboxPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameString, outbox)
+	outboxPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameStringRelaxed, outbox)
 	// OutboxPath parses a path that validates and captures the username part from eg /users/example_username/outbox
 	OutboxPath = regexp.MustCompile(outboxPath)
 
-	actorPath = fmt.Sprintf(`^?/%s/(%s)$`, actors, usernameString)
+	actorPath = fmt.Sprintf(`^/?%s/(%s)$`, actors, usernameStringRelaxed)
 	// ActorPath parses a path that validates and captures the username part from eg /actors/example_username
 	ActorPath = regexp.MustCompile(actorPath)
 
-	followersPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameString, followers)
+	followersPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameStringRelaxed, followers)
 	// FollowersPath parses a path that validates and captures the username part from eg /users/example_username/followers
 	FollowersPath = regexp.MustCompile(followersPath)
 
-	followingPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameString, following)
+	followingPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameStringRelaxed, following)
 	// FollowingPath parses a path that validates and captures the username part from eg /users/example_username/following
 	FollowingPath = regexp.MustCompile(followingPath)
 
-	followPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameString, follow, ulid)
+	followPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameStringRelaxed, follow, ulid)
 	// FollowPath parses a path that validates and captures the username part and the ulid part
 	// from eg /users/example_username/follow/01F7XT5JZW1WMVSW1KADS8PVDH
 	FollowPath = regexp.MustCompile(followPath)
@@ -119,22 +124,22 @@ var (
 	// ULID parses and validate a ULID.
 	ULID = regexp.MustCompile(fmt.Sprintf(`^%s$`, ulid))
 
-	likedPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameString, liked)
+	likedPath = fmt.Sprintf(`^/?%s/(%s)/%s$`, users, usernameStringRelaxed, liked)
 	// LikedPath parses a path that validates and captures the username part from eg /users/example_username/liked
 	LikedPath = regexp.MustCompile(likedPath)
 
-	likePath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameString, liked, ulid)
+	likePath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameStringRelaxed, liked, ulid)
 	// LikePath parses a path that validates and captures the username part and the ulid part
 	// from eg /users/example_username/like/01F7XT5JZW1WMVSW1KADS8PVDH
 	LikePath = regexp.MustCompile(likePath)
 
-	statusesPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameString, statuses, ulid)
+	statusesPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameStringRelaxed, statuses, ulid)
 	// StatusesPath parses a path that validates and captures the username part and the ulid part
 	// from eg /users/example_username/statuses/01F7XT5JZW1WMVSW1KADS8PVDH
 	// The regex can be played with here: https://regex101.com/r/G9zuxQ/1
 	StatusesPath = regexp.MustCompile(statusesPath)
 
-	blockPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameString, blocks, ulid)
+	blockPath = fmt.Sprintf(`^/?%s/(%s)/%s/(%s)$`, users, usernameStringRelaxed, blocks, ulid)
 	// BlockPath parses a path that validates and captures the username part and the ulid part
 	// from eg /users/example_username/blocks/01F7XT5JZW1WMVSW1KADS8PVDH
 	BlockPath = regexp.MustCompile(blockPath)

internal/typeutils/converter.go

@@ -188,6 +188,8 @@ type TypeConverter interface {
 	//
 	// Appropriate 'next' and 'prev' fields will be created based on the highest and lowest IDs present in the statuses slice.
 	StatusesToASOutboxPage(ctx context.Context, outboxID string, maxID string, minID string, statuses []*gtsmodel.Status) (vocab.ActivityStreamsOrderedCollectionPage, error)
+	// ReportToASFlag converts a gts model report into an activitystreams FLAG, suitable for federation.
+	ReportToASFlag(ctx context.Context, r *gtsmodel.Report) (vocab.ActivityStreamsFlag, error)
 
 	/*
 		INTERNAL (gts) MODEL TO INTERNAL MODEL

internal/typeutils/internaltoas.go

@@ -1295,3 +1295,53 @@ func (c *converter) OutboxToASCollection(ctx context.Context, outboxID string) (
 
 	return collection, nil
 }
+
+func (c *converter) ReportToASFlag(ctx context.Context, r *gtsmodel.Report) (vocab.ActivityStreamsFlag, error) {
+	flag := streams.NewActivityStreamsFlag()
+
+	flagIDProp := streams.NewJSONLDIdProperty()
+	idURI, err := url.Parse(r.URI)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing url %s: %w", r.URI, err)
+	}
+	flagIDProp.SetIRI(idURI)
+	flag.SetJSONLDId(flagIDProp)
+
+	// for privacy, set the actor as the INSTANCE ACTOR,
+	// not as the actor who created the report
+	instanceAccount, err := c.db.GetInstanceAccount(ctx, "")
+	if err != nil {
+		return nil, fmt.Errorf("error getting instance account: %w", err)
+	}
+	instanceAccountIRI, err := url.Parse(instanceAccount.URI)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing url %s: %w", instanceAccount.URI, err)
+	}
+	flagActorProp := streams.NewActivityStreamsActorProperty()
+	flagActorProp.AppendIRI(instanceAccountIRI)
+	flag.SetActivityStreamsActor(flagActorProp)
+
+	// content should be the comment submitted when the report was created
+	contentProp := streams.NewActivityStreamsContentProperty()
+	contentProp.AppendXMLSchemaString(r.Comment)
+	flag.SetActivityStreamsContent(contentProp)
+
+	// set at least the target account uri as the object of the flag
+	objectProp := streams.NewActivityStreamsObjectProperty()
+	targetAccountURI, err := url.Parse(r.TargetAccount.URI)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing url %s: %w", r.TargetAccount.URI, err)
+	}
+	objectProp.AppendIRI(targetAccountURI)
+	// also set status URIs if they were provided with the report
+	for _, s := range r.Statuses {
+		statusURI, err := url.Parse(s.URI)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing url %s: %w", s.URI, err)
+		}
+		objectProp.AppendIRI(statusURI)
+	}
+	flag.SetActivityStreamsObject(objectProp)
+
+	return flag, nil
+}

internal/typeutils/internaltoas_test.go

@@ -510,6 +510,40 @@ func (suite *InternalToASTestSuite) TestSelfBoostFollowersOnlyToAS() {
 }`, string(bytes))
 }
 
+func (suite *InternalToASTestSuite) TestReportToAS() {
+	ctx := context.Background()
+
+	testReport := suite.testReports["local_account_2_report_remote_account_1"]
+	account := suite.testAccounts["local_account_2"]
+	targetAccount := suite.testAccounts["remote_account_1"]
+	statuses := []*gtsmodel.Status{suite.testStatuses["remote_account_1_status_1"]}
+
+	testReport.Account = account
+	testReport.TargetAccount = targetAccount
+	testReport.Statuses = statuses
+
+	flag, err := suite.typeconverter.ReportToASFlag(ctx, testReport)
+	suite.NoError(err)
+
+	ser, err := streams.Serialize(flag)
+	suite.NoError(err)
+
+	bytes, err := json.MarshalIndent(ser, "", "  ")
+	suite.NoError(err)
+
+	suite.Equal(`{
+  "@context": "https://www.w3.org/ns/activitystreams",
+  "actor": "http://localhost:8080/users/localhost:8080",
+  "content": "dark souls sucks, please yeet this nerd",
+  "id": "http://localhost:8080/reports/01GP3AWY4CRDVRNZKW0TEAMB5R",
+  "object": [
+    "http://fossbros-anonymous.io/users/foss_satan",
+    "http://fossbros-anonymous.io/users/foss_satan/statuses/01FVW7JHQFSFK166WWKR8CBA6M"
+  ],
+  "type": "Flag"
+}`, string(bytes))
+}
+
 func TestInternalToASTestSuite(t *testing.T) {
 	suite.Run(t, new(InternalToASTestSuite))
 }

testrig/testmodels.go

@@ -1928,7 +1928,7 @@ func NewTestReports() map[string]*gtsmodel.Report {
 			ID:              "01GP3AWY4CRDVRNZKW0TEAMB5R",
 			CreatedAt:       TimeMustParse("2022-05-14T12:20:03+02:00"),
 			UpdatedAt:       TimeMustParse("2022-05-14T12:20:03+02:00"),
-			URI:             "http://localhost:8080/01GP3AWY4CRDVRNZKW0TEAMB5R",
+			URI:             "http://localhost:8080/reports/01GP3AWY4CRDVRNZKW0TEAMB5R",
 			AccountID:       "01F8MH5NBDF2MV7CTC4Q5128HF",
 			TargetAccountID: "01F8MH5ZK5VRH73AKHQM6Y9VNX",
 			Comment:         "dark souls sucks, please yeet this nerd",