2 files changed, 97 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
+}