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126 lines
4.1 KiB
Go
126 lines
4.1 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package admin
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import (
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"context"
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"io"
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"net/http"
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"net/url"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
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"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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)
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// DebugAPUrl performs a GET to the given url, using the
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// signature of the given admin account. The GET will
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// have Accept set to the ActivityPub content types.
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//
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// Only urls with schema http or https are allowed.
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//
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// Calls to blocked domains are not allowed, not only
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// because it's unfair to call them when they can't
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// call us, but because it probably won't work anyway
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// if they try to dereference the calling account.
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//
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// Errors returned from this function should be fairly
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// verbose, to help with debugging.
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func (p *Processor) DebugAPUrl(
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ctx context.Context,
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adminAcct *gtsmodel.Account,
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urlStr string,
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) (*apimodel.DebugAPUrlResponse, gtserror.WithCode) {
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// Validate URL.
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if urlStr == "" {
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err := gtserror.New("empty URL")
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return nil, gtserror.NewErrorBadRequest(err, err.Error())
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}
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url, err := url.Parse(urlStr)
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if err != nil {
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err := gtserror.Newf("invalid URL: %w", err)
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return nil, gtserror.NewErrorBadRequest(err, err.Error())
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}
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if url == nil || (url.Scheme != "http" && url.Scheme != "https") {
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err = gtserror.New("invalid URL scheme, acceptable schemes are http or https")
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return nil, gtserror.NewErrorBadRequest(err, err.Error())
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}
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// Ensure URL not blocked.
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blocked, err := p.state.DB.IsDomainBlocked(ctx, url.Host)
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if err != nil {
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err = gtserror.Newf("db error checking for domain block: %w", err)
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return nil, gtserror.NewErrorInternalError(err, err.Error())
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}
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if blocked {
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err = gtserror.Newf("target domain %s is blocked", url.Host)
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return nil, gtserror.NewErrorBadRequest(err, err.Error())
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}
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// All looks fine. Prepare the transport and (signed) GET request.
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tsport, err := p.transport.NewTransportForUsername(ctx, adminAcct.Username)
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if err != nil {
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err = gtserror.Newf("error creating transport: %w", err)
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return nil, gtserror.NewErrorInternalError(err, err.Error())
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}
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req, err := http.NewRequestWithContext(
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// Caller will want a snappy
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// response so don't retry.
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gtscontext.SetFastFail(ctx),
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http.MethodGet, urlStr, nil,
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)
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if err != nil {
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err = gtserror.Newf("error creating request: %w", err)
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return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
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}
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req.Header.Add("Accept", string(apiutil.AppActivityLDJSON)+","+string(apiutil.AppActivityJSON))
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req.Header.Add("Accept-Charset", "utf-8")
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// Perform the HTTP request,
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// and return everything.
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rsp, err := tsport.GET(req)
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if err != nil {
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err = gtserror.Newf("error doing dereference: %w", err)
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return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
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}
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defer rsp.Body.Close()
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b, err := io.ReadAll(rsp.Body)
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if err != nil {
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err := gtserror.Newf("error reading response body bytes: %w", err)
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return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
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}
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debugResponse := &apimodel.DebugAPUrlResponse{
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RequestURL: urlStr,
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RequestHeaders: req.Header,
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ResponseHeaders: rsp.Header,
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ResponseCode: rsp.StatusCode,
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ResponseBody: string(b),
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}
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return debugResponse, nil
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}
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