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// 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"
"net/textproto"
"regexp"
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/headerfilter"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// GetAllowHeaderFilter fetches allow HTTP header filter with provided ID from the database.
func (p *Processor) GetAllowHeaderFilter(ctx context.Context, id string) (*apimodel.HeaderFilter, gtserror.WithCode) {
return p.getHeaderFilter(ctx, id, p.state.DB.GetAllowHeaderFilter)
}
// GetBlockHeaderFilter fetches block HTTP header filter with provided ID from the database.
func (p *Processor) GetBlockHeaderFilter(ctx context.Context, id string) (*apimodel.HeaderFilter, gtserror.WithCode) {
return p.getHeaderFilter(ctx, id, p.state.DB.GetBlockHeaderFilter)
}
// GetAllowHeaderFilters fetches all allow HTTP header filters stored in the database.
func (p *Processor) GetAllowHeaderFilters(ctx context.Context) ([]*apimodel.HeaderFilter, gtserror.WithCode) {
return p.getHeaderFilters(ctx, p.state.DB.GetAllowHeaderFilters)
}
// GetBlockHeaderFilters fetches all block HTTP header filters stored in the database.
func (p *Processor) GetBlockHeaderFilters(ctx context.Context) ([]*apimodel.HeaderFilter, gtserror.WithCode) {
return p.getHeaderFilters(ctx, p.state.DB.GetBlockHeaderFilters)
}
// CreateAllowHeaderFilter inserts the incoming allow HTTP header filter into the database, marking as authored by provided admin account.
func (p *Processor) CreateAllowHeaderFilter(ctx context.Context, admin *gtsmodel.Account, request *apimodel.HeaderFilterRequest) (*apimodel.HeaderFilter, gtserror.WithCode) {
return p.createHeaderFilter(ctx, admin, request, p.state.DB.PutAllowHeaderFilter)
}
// CreateBlockHeaderFilter inserts the incoming block HTTP header filter into the database, marking as authored by provided admin account.
func (p *Processor) CreateBlockHeaderFilter(ctx context.Context, admin *gtsmodel.Account, request *apimodel.HeaderFilterRequest) (*apimodel.HeaderFilter, gtserror.WithCode) {
return p.createHeaderFilter(ctx, admin, request, p.state.DB.PutBlockHeaderFilter)
}
// DeleteAllowHeaderFilter deletes the allowing HTTP header filter with provided ID from the database.
func (p *Processor) DeleteAllowHeaderFilter(ctx context.Context, id string) gtserror.WithCode {
return p.deleteHeaderFilter(ctx, id, p.state.DB.DeleteAllowHeaderFilter)
}
// DeleteBlockHeaderFilter deletes the blocking HTTP header filter with provided ID from the database.
func (p *Processor) DeleteBlockHeaderFilter(ctx context.Context, id string) gtserror.WithCode {
return p.deleteHeaderFilter(ctx, id, p.state.DB.DeleteBlockHeaderFilter)
}
// getHeaderFilter fetches an HTTP header filter with
// provided ID, using given get function, converting the
// resulting filter to returnable frontend API model.
func (p *Processor) getHeaderFilter(
ctx context.Context,
id string,
get func(context.Context, string) (*gtsmodel.HeaderFilter, error),
) (
*apimodel.HeaderFilter,
gtserror.WithCode,
) {
// Select filter by ID from db.
filter, err := get(ctx, id)
switch {
// Successfully found.
case err == nil:
return toAPIHeaderFilter(filter), nil
// Filter does not exist with ID.
case errors.Is(err, db.ErrNoEntries):
const text = "filter not found"
return nil, gtserror.NewErrorNotFound(errors.New(text), text)
// Any other error type.
default:
err := gtserror.Newf("error selecting from database: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
}
// getHeaderFilters fetches all HTTP header filters
// using given get function, converting the resulting
// filters to returnable frontend API models.
func (p *Processor) getHeaderFilters(
ctx context.Context,
get func(context.Context) ([]*gtsmodel.HeaderFilter, error),
) (
[]*apimodel.HeaderFilter,
gtserror.WithCode,
) {
// Select all filters from DB.
filters, err := get(ctx)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
// Only handle errors other than not-found types.
err := gtserror.Newf("error selecting from database: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Convert passed header filters to apimodel filters.
apiFilters := make([]*apimodel.HeaderFilter, len(filters))
for i := range filters {
apiFilters[i] = toAPIHeaderFilter(filters[i])
}
return apiFilters, nil
}
// createHeaderFilter inserts the given HTTP header
// filter into database, marking as authored by the
// provided admin, using the given insert function.
func (p *Processor) createHeaderFilter(
ctx context.Context,
admin *gtsmodel.Account,
request *apimodel.HeaderFilterRequest,
insert func(context.Context, *gtsmodel.HeaderFilter) error,
) (
*apimodel.HeaderFilter,
gtserror.WithCode,
) {
// Convert header key to canonical mime header format.
request.Header = textproto.CanonicalMIMEHeaderKey(request.Header)
// Validate incoming header filter.
if errWithCode := validateHeaderFilter(
request.Header,
request.Regex,
); errWithCode != nil {
return nil, errWithCode
}
// Create new database model with ID.
var filter gtsmodel.HeaderFilter
filter.ID = id.NewULID()
filter.Header = request.Header
filter.Regex = request.Regex
filter.AuthorID = admin.ID
filter.Author = admin
// Insert new header filter into the database.
if err := insert(ctx, &filter); err != nil {
err := gtserror.Newf("error inserting into database: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Finally return API model response.
return toAPIHeaderFilter(&filter), nil
}
// deleteHeaderFilter deletes the HTTP header filter
// with provided ID, using the given delete function.
func (p *Processor) deleteHeaderFilter(
ctx context.Context,
id string,
delete func(context.Context, string) error,
) gtserror.WithCode {
if err := delete(ctx, id); err != nil && !errors.Is(err, db.ErrNoEntries) {
err := gtserror.Newf("error deleting from database: %w", err)
return gtserror.NewErrorInternalError(err)
}
return nil
}
// toAPIFilter performs a simple conversion of database model HeaderFilter to API model.
func toAPIHeaderFilter(filter *gtsmodel.HeaderFilter) *apimodel.HeaderFilter {
return &apimodel.HeaderFilter{
ID: filter.ID,
Header: filter.Header,
Regex: filter.Regex,
CreatedBy: filter.AuthorID,
CreatedAt: util.FormatISO8601(filter.CreatedAt),
}
}
// validateHeaderFilter validates incoming filter's header key, and regular expression.
func validateHeaderFilter(header, regex string) gtserror.WithCode {
// Check header validity (within our own bound checks).
if header == "" || len(header) > headerfilter.MaxHeaderValue {
const text = "invalid request header key (empty or too long)"
return gtserror.NewErrorBadRequest(errors.New(text), text)
}
// Ensure this is compilable regex.
_, err := regexp.Compile(regex)
if err != nil {
return gtserror.NewErrorBadRequest(err, err.Error())
}
return nil
}
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