Deletes+unboosts (#52)

* Status deletes properly streamed now.
* Unboosts now work locally and federated.
* Documentation updates.

4 files changed, 153 insertions, 0 deletions

diff --git a/internal/processing/synchronous/status/status.go b/internal/processing/synchronous/status/status.go
index cfc48ff30..d83c325fd 100644
--- a/internal/processing/synchronous/status/status.go
+++ b/internal/processing/synchronous/status/status.go
@@ -21,6 +21,8 @@ type Processor interface {
 	Fave(account *gtsmodel.Account, targetStatusID string) (*apimodel.Status, gtserror.WithCode)
 	// Boost processes the boost/reblog of a given status, returning the newly-created boost if all is well.
 	Boost(account *gtsmodel.Account, application *gtsmodel.Application, targetStatusID string) (*apimodel.Status, gtserror.WithCode)
+	// Unboost processes the unboost/unreblog of a given status, returning the status if all is well.
+	Unboost(account *gtsmodel.Account, application *gtsmodel.Application, targetStatusID string) (*apimodel.Status, gtserror.WithCode)
 	// BoostedBy returns a slice of accounts that have boosted the given status, filtered according to privacy settings.
 	BoostedBy(account *gtsmodel.Account, targetStatusID string) ([]*apimodel.Account, gtserror.WithCode)
 	// FavedBy returns a slice of accounts that have liked the given status, filtered according to privacy settings.
diff --git a/internal/processing/synchronous/status/unboost.go b/internal/processing/synchronous/status/unboost.go
new file mode 100644
index 000000000..2a1394695
--- /dev/null
+++ b/internal/processing/synchronous/status/unboost.go
@@ -0,0 +1,95 @@
+package status
+
+import (
+	"errors"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) Unboost(account *gtsmodel.Account, application *gtsmodel.Application, targetStatusID string) (*apimodel.Status, gtserror.WithCode) {
+	l := p.log.WithField("func", "Unboost")
+
+	l.Tracef("going to search for target status %s", targetStatusID)
+	targetStatus := &gtsmodel.Status{}
+	if err := p.db.GetByID(targetStatusID, targetStatus); err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("error fetching status %s: %s", targetStatusID, err))
+	}
+
+	l.Tracef("going to search for target account %s", targetStatus.AccountID)
+	targetAccount := &gtsmodel.Account{}
+	if err := p.db.GetByID(targetStatus.AccountID, targetAccount); err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("error fetching target account %s: %s", targetStatus.AccountID, err))
+	}
+
+	l.Trace("going to see if status is visible")
+	visible, err := p.filter.StatusVisible(targetStatus, account)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("error seeing if status %s is visible: %s", targetStatus.ID, err))
+	}
+
+	if !visible {
+		return nil, gtserror.NewErrorNotFound(errors.New("status is not visible"))
+	}
+
+	// check if we actually have a boost for this status
+	var toUnboost bool
+
+	gtsBoost := &gtsmodel.Status{}
+	where := []db.Where{
+		{
+			Key:   "boost_of_id",
+			Value: targetStatusID,
+		},
+		{
+			Key:   "account_id",
+			Value: account.ID,
+		},
+	}
+	err = p.db.GetWhere(where, gtsBoost)
+	if err == nil {
+		// we have a boost
+		toUnboost = true
+	}
+
+	if err != nil {
+		// something went wrong in the db finding the boost
+		if _, ok := err.(db.ErrNoEntries); !ok {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching existing boost from database: %s", err))
+		}
+		// we just don't have a boost
+		toUnboost = false
+	}
+
+	if toUnboost {
+		// we had a boost, so take some action to get rid of it
+		if err := p.db.DeleteWhere(where, &gtsmodel.Status{}); err != nil {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error unboosting status: %s", err))
+		}
+
+		// pin some stuff onto the boost while we have it out of the db
+		gtsBoost.GTSBoostedStatus = targetStatus
+		gtsBoost.GTSBoostedStatus.GTSAuthorAccount = targetAccount
+		gtsBoost.GTSBoostedAccount = targetAccount
+		gtsBoost.GTSAuthorAccount = account
+
+		// send it back to the processor for async processing
+		p.fromClientAPI <- gtsmodel.FromClientAPI{
+			APObjectType:   gtsmodel.ActivityStreamsAnnounce,
+			APActivityType: gtsmodel.ActivityStreamsUndo,
+			GTSModel:       gtsBoost,
+			OriginAccount:  account,
+			TargetAccount:  targetAccount,
+		}
+	}
+
+	mastoStatus, err := p.tc.StatusToMasto(targetStatus, account)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting status %s to frontend representation: %s", targetStatus.ID, err))
+	}
+
+	return mastoStatus, nil
+}
diff --git a/internal/processing/synchronous/streaming/streamdelete.go b/internal/processing/synchronous/streaming/streamdelete.go
new file mode 100644
index 000000000..2282c29ae
--- /dev/null
+++ b/internal/processing/synchronous/streaming/streamdelete.go
@@ -0,0 +1,51 @@
+package streaming
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) StreamDelete(statusID string) error {
+	errs := []string{}
+
+	// we want to range through ALL streams for ALL accounts here to make sure it's very clear to everyone that the status has been deleted
+	p.streamMap.Range(func(k interface{}, v interface{}) bool {
+		// the key of this map should be an accountID (string)
+		accountID, ok := k.(string)
+		if !ok {
+			errs = append(errs, "key in streamMap was not a string!")
+			return false
+		}
+
+		// the value of the map should be a buncha streams
+		streamsForAccount, ok := v.(*gtsmodel.StreamsForAccount)
+		if !ok {
+			errs = append(errs, fmt.Sprintf("stream map error for account stream %s", accountID))
+		}
+
+		// lock the streams while we work on them
+		streamsForAccount.Lock()
+		defer streamsForAccount.Unlock()
+		for _, stream := range streamsForAccount.Streams {
+			// lock each individual stream as we work on it
+			stream.Lock()
+			defer stream.Unlock()
+			if stream.Connected {
+				stream.Messages <- &gtsmodel.Message{
+					Stream:  []string{stream.Type},
+					Event:   "delete",
+					Payload: statusID,
+				}
+			}
+		}
+		return true
+	})
+
+	if len(errs) != 0 {
+		return fmt.Errorf("one or more errors streaming status delete: %s", strings.Join(errs, ";"))
+	}
+
+	return nil
+}
diff --git a/internal/processing/synchronous/streaming/streaming.go b/internal/processing/synchronous/streaming/streaming.go
index 9fd628547..de75b8f27 100644
--- a/internal/processing/synchronous/streaming/streaming.go
+++ b/internal/processing/synchronous/streaming/streaming.go
@@ -18,9 +18,14 @@ import (
 type Processor interface {
 	// AuthorizeStreamingRequest returns an oauth2 token info in response to an access token query from the streaming API
 	AuthorizeStreamingRequest(accessToken string) (*gtsmodel.Account, error)
+	// OpenStreamForAccount returns a new Stream for the given account, which will contain a channel for passing messages back to the caller.
 	OpenStreamForAccount(account *gtsmodel.Account, streamType string) (*gtsmodel.Stream, gtserror.WithCode)
+	// StreamStatusToAccount streams the given status to any open, appropriate streams belonging to the given account.
 	StreamStatusToAccount(s *apimodel.Status, account *gtsmodel.Account) error
+	// StreamNotificationToAccount streams the given notification to any open, appropriate streams belonging to the given account.
 	StreamNotificationToAccount(n *apimodel.Notification, account *gtsmodel.Account) error
+	// StreamDelete streams the delete of the given statusID to *ALL* open streams.
+	StreamDelete(statusID string) error
 }
 
 type processor struct {