[feature] Implement profile API (#2926)

* Implement profile API

This Mastodon 4.2 extension provides capabilities missing from the existing Mastodon account update API: deleting an account's avatar or header.

See: https://docs.joinmastodon.org/methods/profile/

* Move profile media methods to media processor

* Remove check for moved account

internal/processing/media/profile.go

@@ -0,0 +1,77 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// 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 media
+
+import (
+	"context"
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+// DeleteAvatar deletes the account's avatar, if one exists, and returns the updated account.
+// If no avatar exists, it returns anyway with no error.
+func (p *Processor) DeleteAvatar(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) (*apimodel.Account, gtserror.WithCode) {
+	attachmentID := account.AvatarMediaAttachmentID
+	account.AvatarMediaAttachmentID = ""
+	return p.deleteProfileAttachment(ctx, account, "avatar_media_attachment_id", attachmentID)
+}
+
+// DeleteHeader deletes the account's header, if one exists, and returns the updated account.
+// If no header exists, it returns anyway with no error.
+func (p *Processor) DeleteHeader(
+	ctx context.Context,
+	account *gtsmodel.Account,
+) (*apimodel.Account, gtserror.WithCode) {
+	attachmentID := account.HeaderMediaAttachmentID
+	account.HeaderMediaAttachmentID = ""
+	return p.deleteProfileAttachment(ctx, account, "header_media_attachment_id", attachmentID)
+}
+
+// deleteProfileAttachment updates an attachment ID column and then deletes the attachment.
+// Precondition: the relevant attachment ID field of the account model has already been set to the empty string.
+func (p *Processor) deleteProfileAttachment(
+	ctx context.Context,
+	account *gtsmodel.Account,
+	attachmentIDColumn string,
+	attachmentID string,
+) (*apimodel.Account, gtserror.WithCode) {
+	if attachmentID != "" {
+		// Remove attachment from account.
+		if err := p.state.DB.UpdateAccount(ctx, account, attachmentIDColumn); err != nil {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("could not update account: %s", err))
+		}
+
+		// Delete attachment media.
+		if err := p.Delete(ctx, attachmentID); err != nil {
+			return nil, err
+		}
+	}
+
+	acctSensitive, err := p.converter.AccountToAPIAccountSensitive(ctx, account)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("could not convert account into apisensitive account: %s", err))
+	}
+
+	return acctSensitive, nil
+}