Block/unblock (#96)

* remote + local block logic, incl. federation

* improve blocking stuff

* fiddle with display of blocked profiles

* go fmt

internal/processing/account/removeblock.go

@@ -0,0 +1,67 @@
+/*
+   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 (
+	"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) BlockRemove(requestingAccount *gtsmodel.Account, targetAccountID string) (*apimodel.Relationship, gtserror.WithCode) {
+	// make sure the target account actually exists in our db
+	targetAcct := &gtsmodel.Account{}
+	if err := p.db.GetByID(targetAccountID, targetAcct); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			return nil, gtserror.NewErrorNotFound(fmt.Errorf("BlockRemove: account %s not found in the db: %s", targetAccountID, err))
+		}
+	}
+
+	// check if a block exists, and remove it if it does (storing the URI for later)
+	var blockChanged bool
+	block := &gtsmodel.Block{}
+	if err := p.db.GetWhere([]db.Where{
+		{Key: "account_id", Value: requestingAccount.ID},
+		{Key: "target_account_id", Value: targetAccountID},
+	}, block); err == nil {
+		block.Account = requestingAccount
+		block.TargetAccount = targetAcct
+		if err := p.db.DeleteByID(block.ID, &gtsmodel.Block{}); err != nil {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("BlockRemove: error removing block from db: %s", err))
+		}
+		blockChanged = true
+	}
+
+	// block status changed so send the UNDO activity to the channel for async processing
+	if blockChanged {
+		p.fromClientAPI <- gtsmodel.FromClientAPI{
+			APObjectType:   gtsmodel.ActivityStreamsBlock,
+			APActivityType: gtsmodel.ActivityStreamsUndo,
+			GTSModel:       block,
+			OriginAccount:  requestingAccount,
+			TargetAccount:  targetAcct,
+		}
+	}
+
+	// return whatever relationship results from all this
+	return p.RelationshipGet(requestingAccount, targetAccountID)
+}