[feature] Admin accounts endpoints; approve/reject sign-ups (#2826)

* update settings panels, add pending overview + approve/deny functions

* add admin accounts get, approve, reject

* send approved/rejected emails

* use signup URL

* docs!

* email

* swagger

* web linting

* fix email tests

* wee lil fixerinos

* use new paging logic for GetAccounts() series of admin endpoints, small changes to query building

* shuffle useAccountIDIn check *before* adding to query

* fix parse from toot react error

* use `netip.Addr`

* put valid slices in globals

* optimistic updates for account state

---------

Co-authored-by: kim <grufwub@gmail.com>

internal/processing/admin/accountreject.go

@@ -0,0 +1,113 @@
+// 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 admin
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	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"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+)
+
+func (p *Processor) AccountReject(
+	ctx context.Context,
+	adminAcct *gtsmodel.Account,
+	accountID string,
+	privateComment string,
+	sendEmail bool,
+	message string,
+) (*apimodel.AdminAccountInfo, gtserror.WithCode) {
+	user, err := p.state.DB.GetUserByAccountID(ctx, accountID)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting user for account id %s: %w", accountID, err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if user == nil {
+		err := fmt.Errorf("user for account %s not found", accountID)
+		return nil, gtserror.NewErrorNotFound(err, err.Error())
+	}
+
+	// Get a lock on the account URI,
+	// since we're going to be deleting
+	// it and its associated user.
+	unlock := p.state.ClientLocks.Lock(user.Account.URI)
+	defer unlock()
+
+	// Can't reject an account with a
+	// user that's already been approved.
+	if *user.Approved {
+		err := fmt.Errorf("account %s has already been approved", accountID)
+		return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
+	}
+
+	// Convert to API account *before* doing the
+	// rejection, since the rejection will cause
+	// the user and account to be removed.
+	apiAccount, err := p.converter.AccountToAdminAPIAccount(ctx, user.Account)
+	if err != nil {
+		err := gtserror.Newf("error converting account %s to admin api model: %w", accountID, err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// Set approved to false on the API model, to
+	// reflect the changes that will occur
+	// asynchronously in the processor.
+	apiAccount.Approved = false
+
+	// Ensure we an email address.
+	var email string
+	if user.Email != "" {
+		email = user.Email
+	} else {
+		email = user.UnconfirmedEmail
+	}
+
+	// Create a denied user entry for
+	// the worker to process + store.
+	deniedUser := &gtsmodel.DeniedUser{
+		ID:                     user.ID,
+		Email:                  email,
+		Username:               user.Account.Username,
+		SignUpIP:               user.SignUpIP,
+		InviteID:               user.InviteID,
+		Locale:                 user.Locale,
+		CreatedByApplicationID: user.CreatedByApplicationID,
+		SignUpReason:           user.Reason,
+		PrivateComment:         privateComment,
+		SendEmail:              &sendEmail,
+		Message:                message,
+	}
+
+	// Process rejection side effects asynschronously.
+	p.state.Workers.EnqueueClientAPI(ctx, messages.FromClientAPI{
+		APObjectType:   ap.ActorPerson,
+		APActivityType: ap.ActivityReject,
+		GTSModel:       deniedUser,
+		OriginAccount:  adminAcct,
+		TargetAccount:  user.Account,
+	})
+
+	return apiAccount, nil
+}