122 lines
4.5 KiB
Go
122 lines
4.5 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 fedi
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import (
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"context"
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"errors"
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"fmt"
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"net/url"
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"github.com/superseriousbusiness/activity/streams/vocab"
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"github.com/superseriousbusiness/gotosocial/internal/ap"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/uris"
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)
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// UserGet handles the getting of a fedi/activitypub representation of a user/account,
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// performing authentication before returning a JSON serializable interface to the caller.
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func (p *Processor) UserGet(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
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// (Try to) get the requested local account from the db.
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receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUsername, "")
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if err != nil {
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if errors.Is(err, db.ErrNoEntries) {
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// Account just not found w/ this username.
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err := fmt.Errorf("account with username %s not found in the db", requestedUsername)
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return nil, gtserror.NewErrorNotFound(err)
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}
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// Real db error.
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err := fmt.Errorf("db error getting account with username %s: %w", requestedUsername, err)
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return nil, gtserror.NewErrorInternalError(err)
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}
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if uris.IsPublicKeyPath(requestURL) {
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// If request is on a public key path, we don't need to
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// authenticate this request. However, we'll only serve
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// the bare minimum user profile needed for the pubkey.
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//
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// TODO: https://github.com/superseriousbusiness/gotosocial/issues/1186
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minimalPerson, err := p.converter.AccountToASMinimal(ctx, receiver)
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if err != nil {
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err := gtserror.Newf("error converting to minimal account: %w", err)
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return nil, gtserror.NewErrorInternalError(err)
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}
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// Return early with bare minimum data.
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return data(minimalPerson)
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}
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// If the request is not on a public key path, we want to
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// try to authenticate it before we serve any data, so that
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// we can serve a more complete profile.
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pubKeyAuth, errWithCode := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
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if errWithCode != nil {
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return nil, errWithCode // likely 401
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}
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// Auth passed, generate the proper AP representation.
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person, err := p.converter.AccountToAS(ctx, receiver)
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if err != nil {
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err := gtserror.Newf("error converting account: %w", err)
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return nil, gtserror.NewErrorInternalError(err)
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}
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if pubKeyAuth.Handshaking {
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// If we are currently handshaking with the remote account
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// making the request, then don't be coy: just serve the AP
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// representation of the target account.
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//
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// This handshake check ensures that we don't get stuck in
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// a loop with another GtS instance, where each instance is
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// trying repeatedly to dereference the other account that's
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// making the request before it will reveal its own account.
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//
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// Instead, we end up in an 'I'll show you mine if you show me
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// yours' situation, where we sort of agree to reveal each
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// other's profiles at the same time.
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return data(person)
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}
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// Get requester from auth.
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requester := pubKeyAuth.Owner
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// Check that block does not exist between receiver and requester.
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blocked, err := p.state.DB.IsBlocked(ctx, receiver.ID, requester.ID)
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if err != nil {
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err := gtserror.Newf("error checking block: %w", err)
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return nil, gtserror.NewErrorInternalError(err)
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} else if blocked {
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const text = "block exists between accounts"
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return nil, gtserror.NewErrorForbidden(errors.New(text))
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}
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return data(person)
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}
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func data(requestedPerson vocab.ActivityStreamsPerson) (interface{}, gtserror.WithCode) {
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data, err := ap.Serialize(requestedPerson)
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if err != nil {
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err := gtserror.Newf("error serializing person: %w", err)
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return nil, gtserror.NewErrorInternalError(err)
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}
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return data, nil
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}
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