[chore] Deinterface processor and subprocessors (#1501)

* [chore] Deinterface processor and subprocessors

* expose subprocessors via function calls

* missing license header

1 files changed, 141 insertions, 0 deletions

diff --git a/internal/processing/account/relationships.go b/internal/processing/account/relationships.go
new file mode 100644
index 000000000..cb2789829
--- /dev/null
+++ b/internal/processing/account/relationships.go
@@ -0,0 +1,141 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2023 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 (
+	"context"
+	"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"
+)
+
+// FollowersGet fetches a list of the target account's followers.
+func (p *Processor) FollowersGet(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccountID string) ([]apimodel.Account, gtserror.WithCode) {
+	if blocked, err := p.db.IsBlocked(ctx, requestingAccount.ID, targetAccountID, true); err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	} else if blocked {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("block exists between accounts"))
+	}
+
+	accounts := []apimodel.Account{}
+	follows, err := p.db.GetAccountFollowedBy(ctx, targetAccountID, false)
+	if err != nil {
+		if err == db.ErrNoEntries {
+			return accounts, nil
+		}
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	for _, f := range follows {
+		blocked, err := p.db.IsBlocked(ctx, requestingAccount.ID, f.AccountID, true)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		if blocked {
+			continue
+		}
+
+		if f.Account == nil {
+			a, err := p.db.GetAccountByID(ctx, f.AccountID)
+			if err != nil {
+				if err == db.ErrNoEntries {
+					continue
+				}
+				return nil, gtserror.NewErrorInternalError(err)
+			}
+			f.Account = a
+		}
+
+		account, err := p.tc.AccountToAPIAccountPublic(ctx, f.Account)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		accounts = append(accounts, *account)
+	}
+	return accounts, nil
+}
+
+// FollowingGet fetches a list of the accounts that target account is following.
+func (p *Processor) FollowingGet(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccountID string) ([]apimodel.Account, gtserror.WithCode) {
+	if blocked, err := p.db.IsBlocked(ctx, requestingAccount.ID, targetAccountID, true); err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	} else if blocked {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("block exists between accounts"))
+	}
+
+	accounts := []apimodel.Account{}
+	follows, err := p.db.GetAccountFollows(ctx, targetAccountID)
+	if err != nil {
+		if err == db.ErrNoEntries {
+			return accounts, nil
+		}
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	for _, f := range follows {
+		blocked, err := p.db.IsBlocked(ctx, requestingAccount.ID, f.AccountID, true)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		if blocked {
+			continue
+		}
+
+		if f.TargetAccount == nil {
+			a, err := p.db.GetAccountByID(ctx, f.TargetAccountID)
+			if err != nil {
+				if err == db.ErrNoEntries {
+					continue
+				}
+				return nil, gtserror.NewErrorInternalError(err)
+			}
+			f.TargetAccount = a
+		}
+
+		account, err := p.tc.AccountToAPIAccountPublic(ctx, f.TargetAccount)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(err)
+		}
+		accounts = append(accounts, *account)
+	}
+	return accounts, nil
+}
+
+// RelationshipGet returns a relationship model describing the relationship of the targetAccount to the Authed account.
+func (p *Processor) RelationshipGet(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccountID string) (*apimodel.Relationship, gtserror.WithCode) {
+	if requestingAccount == nil {
+		return nil, gtserror.NewErrorForbidden(errors.New("not authed"))
+	}
+
+	gtsR, err := p.db.GetRelationship(ctx, requestingAccount.ID, targetAccountID)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error getting relationship: %s", err))
+	}
+
+	r, err := p.tc.RelationshipToAPIRelationship(ctx, gtsR)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting relationship: %s", err))
+	}
+
+	return r, nil
+}