[feature] Implement `/api/v1/reports` endpoints on client API (#1330)

* start adding report client api

* route + test reports get

* start report create endpoint

* you can create reports now babyy

* stub account report processor

* add single reportGet endpoint

* fix test

* add more filtering params to /api/v1/reports GET

* update swagger

* use marshalIndent in tests

* add + test missing Link info

4 files changed, 284 insertions, 0 deletions

diff --git a/internal/processing/report/create.go b/internal/processing/report/create.go
new file mode 100644
index 000000000..ac4c4390d
--- /dev/null
+++ b/internal/processing/report/create.go
@@ -0,0 +1,103 @@
+/*
+   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 report
+
+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/id"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/uris"
+)
+
+func (p *processor) Create(ctx context.Context, account *gtsmodel.Account, form *apimodel.ReportCreateRequest) (*apimodel.Report, gtserror.WithCode) {
+	if account.ID == form.AccountID {
+		err := errors.New("cannot report your own account")
+		return nil, gtserror.NewErrorBadRequest(err, err.Error())
+	}
+
+	// validate + fetch target account
+	targetAccount, err := p.db.GetAccountByID(ctx, form.AccountID)
+	if err != nil {
+		if errors.Is(err, db.ErrNoEntries) {
+			err = fmt.Errorf("account with ID %s does not exist", form.AccountID)
+			return nil, gtserror.NewErrorBadRequest(err, err.Error())
+		}
+		err = fmt.Errorf("db error fetching report target account: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	// fetch statuses by IDs given in the report form (noop if no statuses given)
+	statuses, err := p.db.GetStatuses(ctx, form.StatusIDs)
+	if err != nil {
+		err = fmt.Errorf("db error fetching report target statuses: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	for _, s := range statuses {
+		if s.AccountID != form.AccountID {
+			err = fmt.Errorf("status with ID %s does not belong to account %s", s.ID, form.AccountID)
+			return nil, gtserror.NewErrorBadRequest(err, err.Error())
+		}
+	}
+
+	reportID, err := id.NewULID()
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	report := &gtsmodel.Report{
+		ID:              reportID,
+		URI:             uris.GenerateURIForReport(reportID),
+		AccountID:       account.ID,
+		Account:         account,
+		TargetAccountID: form.AccountID,
+		TargetAccount:   targetAccount,
+		Comment:         form.Comment,
+		StatusIDs:       form.StatusIDs,
+		Statuses:        statuses,
+		Forwarded:       &form.Forward,
+	}
+
+	if err := p.db.PutReport(ctx, report); err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	p.clientWorker.Queue(messages.FromClientAPI{
+		APObjectType:   ap.ObjectProfile,
+		APActivityType: ap.ActivityFlag,
+		GTSModel:       report,
+		OriginAccount:  account,
+	})
+
+	apiReport, err := p.tc.ReportToAPIReport(ctx, report)
+	if err != nil {
+		err = fmt.Errorf("error converting report to frontend representation: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return apiReport, nil
+}
diff --git a/internal/processing/report/getreport.go b/internal/processing/report/getreport.go
new file mode 100644
index 000000000..6d4a18daa
--- /dev/null
+++ b/internal/processing/report/getreport.go
@@ -0,0 +1,51 @@
+/*
+   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 report
+
+import (
+	"context"
+	"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) ReportGet(ctx context.Context, account *gtsmodel.Account, id string) (*apimodel.Report, gtserror.WithCode) {
+	report, err := p.db.GetReportByID(ctx, id)
+	if err != nil {
+		if err == db.ErrNoEntries {
+			return nil, gtserror.NewErrorNotFound(err)
+		}
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if report.AccountID != account.ID {
+		err = fmt.Errorf("report with id %s does not belong to account %s", report.ID, account.ID)
+		return nil, gtserror.NewErrorNotFound(err)
+	}
+
+	apiReport, err := p.tc.ReportToAPIReport(ctx, report)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting report to api: %s", err))
+	}
+
+	return apiReport, nil
+}
diff --git a/internal/processing/report/getreports.go b/internal/processing/report/getreports.go
new file mode 100644
index 000000000..e58e847a2
--- /dev/null
+++ b/internal/processing/report/getreports.go
@@ -0,0 +1,79 @@
+/*
+   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 report
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+
+	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/util"
+)
+
+func (p *processor) ReportsGet(ctx context.Context, account *gtsmodel.Account, resolved *bool, targetAccountID string, maxID string, sinceID string, minID string, limit int) (*apimodel.PageableResponse, gtserror.WithCode) {
+	reports, err := p.db.GetReports(ctx, resolved, account.ID, targetAccountID, maxID, sinceID, minID, limit)
+	if err != nil {
+		if err == db.ErrNoEntries {
+			return util.EmptyPageableResponse(), nil
+		}
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	count := len(reports)
+	items := make([]interface{}, 0, count)
+	nextMaxIDValue := ""
+	prevMinIDValue := ""
+	for i, r := range reports {
+		item, err := p.tc.ReportToAPIReport(ctx, r)
+		if err != nil {
+			return nil, gtserror.NewErrorInternalError(fmt.Errorf("error converting report to api: %s", err))
+		}
+
+		if i == count-1 {
+			nextMaxIDValue = item.ID
+		}
+
+		if i == 0 {
+			prevMinIDValue = item.ID
+		}
+
+		items = append(items, item)
+	}
+
+	extraQueryParams := []string{}
+	if resolved != nil {
+		extraQueryParams = append(extraQueryParams, "resolved="+strconv.FormatBool(*resolved))
+	}
+	if targetAccountID != "" {
+		extraQueryParams = append(extraQueryParams, "target_account_id="+targetAccountID)
+	}
+
+	return util.PackagePageableResponse(util.PageableResponseParams{
+		Items:            items,
+		Path:             "/api/v1/reports",
+		NextMaxIDValue:   nextMaxIDValue,
+		PrevMinIDValue:   prevMinIDValue,
+		Limit:            limit,
+		ExtraQueryParams: extraQueryParams,
+	})
+}
diff --git a/internal/processing/report/report.go b/internal/processing/report/report.go
new file mode 100644
index 000000000..8658ac808
--- /dev/null
+++ b/internal/processing/report/report.go
@@ -0,0 +1,51 @@
+/*
+   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 report
+
+import (
+	"context"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/concurrency"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+type Processor interface {
+	ReportsGet(ctx context.Context, account *gtsmodel.Account, resolved *bool, targetAccountID string, maxID string, sinceID string, minID string, limit int) (*apimodel.PageableResponse, gtserror.WithCode)
+	ReportGet(ctx context.Context, account *gtsmodel.Account, id string) (*apimodel.Report, gtserror.WithCode)
+	Create(ctx context.Context, account *gtsmodel.Account, form *apimodel.ReportCreateRequest) (*apimodel.Report, gtserror.WithCode)
+}
+
+type processor struct {
+	db           db.DB
+	tc           typeutils.TypeConverter
+	clientWorker *concurrency.WorkerPool[messages.FromClientAPI]
+}
+
+func New(db db.DB, tc typeutils.TypeConverter, clientWorker *concurrency.WorkerPool[messages.FromClientAPI]) Processor {
+	return &processor{
+		tc:           tc,
+		db:           db,
+		clientWorker: clientWorker,
+	}
+}