gotosocial/internal/processing/federation.go
2021-06-26 16:21:40 +02:00

354 lines
13 KiB
Go

/*
GoToSocial
Copyright (C) 2021 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 processing
import (
"context"
"fmt"
"net/http"
"net/url"
"github.com/go-fed/activity/streams"
"github.com/go-fed/activity/streams/vocab"
"github.com/sirupsen/logrus"
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/util"
)
// authenticateAndDereferenceFediRequest authenticates the HTTP signature of an incoming federation request, using the given
// username to perform the validation. It will *also* dereference the originator of the request and return it as a gtsmodel account
// for further processing. NOTE that this function will have the side effect of putting the dereferenced account into the database,
// and passing it into the processor through a channel for further asynchronous processing.
func (p *processor) authenticateAndDereferenceFediRequest(username string, r *http.Request) (*gtsmodel.Account, error) {
// first authenticate
requestingAccountURI, err := p.federator.AuthenticateFederatedRequest(username, r)
if err != nil {
return nil, fmt.Errorf("couldn't authenticate request for username %s: %s", username, err)
}
// OK now we can do the dereferencing part
// we might already have an entry for this account so check that first
requestingAccount := &gtsmodel.Account{}
err = p.db.GetWhere([]db.Where{{Key: "uri", Value: requestingAccountURI.String()}}, requestingAccount)
if err == nil {
// we do have it yay, return it
return requestingAccount, nil
}
if _, ok := err.(db.ErrNoEntries); !ok {
// something has actually gone wrong so bail
return nil, fmt.Errorf("database error getting account with uri %s: %s", requestingAccountURI.String(), err)
}
// we just don't have an entry for this account yet
// what we do now should depend on our chosen federation method
// for now though, we'll just dereference it
// TODO: slow-fed
requestingPerson, err := p.federator.DereferenceRemoteAccount(username, requestingAccountURI)
if err != nil {
return nil, fmt.Errorf("couldn't dereference %s: %s", requestingAccountURI.String(), err)
}
// convert it to our internal account representation
requestingAccount, err = p.tc.ASRepresentationToAccount(requestingPerson, false)
if err != nil {
return nil, fmt.Errorf("couldn't convert dereferenced uri %s to gtsmodel account: %s", requestingAccountURI.String(), err)
}
requestingAccountID, err := id.NewRandomULID()
if err != nil {
return nil, err
}
requestingAccount.ID = requestingAccountID
if err := p.db.Put(requestingAccount); err != nil {
return nil, fmt.Errorf("database error inserting account with uri %s: %s", requestingAccountURI.String(), err)
}
// put it in our channel to queue it for async processing
p.fromFederator <- gtsmodel.FromFederator{
APObjectType: gtsmodel.ActivityStreamsProfile,
APActivityType: gtsmodel.ActivityStreamsCreate,
GTSModel: requestingAccount,
}
return requestingAccount, nil
}
func (p *processor) GetFediUser(requestedUsername string, request *http.Request) (interface{}, gtserror.WithCode) {
l := p.log.WithFields(logrus.Fields{
"func": "GetFediUser",
"requestedUsername": requestedUsername,
"requestURL": request.URL.String(),
})
// get the account the request is referring to
requestedAccount := &gtsmodel.Account{}
if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
}
var requestedPerson vocab.ActivityStreamsPerson
var err error
if util.IsPublicKeyPath(request.URL) {
l.Debug("serving from public key path")
// if it's a public key path, we don't need to authenticate but we'll only serve the bare minimum user profile needed for the public key
requestedPerson, err = p.tc.AccountToASMinimal(requestedAccount)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
} else if util.IsUserPath(request.URL) {
l.Debug("serving from user path")
// if it's a user path, we want to fully authenticate the request before we serve any data, and then we can serve a more complete profile
requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
if err != nil {
return nil, gtserror.NewErrorNotAuthorized(err)
}
blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
if blocked {
return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
}
requestedPerson, err = p.tc.AccountToAS(requestedAccount)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
} else {
return nil, gtserror.NewErrorBadRequest(fmt.Errorf("path was not public key path or user path"))
}
data, err := streams.Serialize(requestedPerson)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
return data, nil
}
func (p *processor) GetFediFollowers(requestedUsername string, request *http.Request) (interface{}, gtserror.WithCode) {
// get the account the request is referring to
requestedAccount := &gtsmodel.Account{}
if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
}
// authenticate the request
requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
if err != nil {
return nil, gtserror.NewErrorNotAuthorized(err)
}
blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
if blocked {
return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
}
requestedAccountURI, err := url.Parse(requestedAccount.URI)
if err != nil {
return nil, gtserror.NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
}
requestedFollowers, err := p.federator.FederatingDB().Followers(context.Background(), requestedAccountURI)
if err != nil {
return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching followers for uri %s: %s", requestedAccountURI.String(), err))
}
data, err := streams.Serialize(requestedFollowers)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
return data, nil
}
func (p *processor) GetFediFollowing(requestedUsername string, request *http.Request) (interface{}, gtserror.WithCode) {
// get the account the request is referring to
requestedAccount := &gtsmodel.Account{}
if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
}
// authenticate the request
requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
if err != nil {
return nil, gtserror.NewErrorNotAuthorized(err)
}
blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
if blocked {
return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
}
requestedAccountURI, err := url.Parse(requestedAccount.URI)
if err != nil {
return nil, gtserror.NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
}
requestedFollowing, err := p.federator.FederatingDB().Following(context.Background(), requestedAccountURI)
if err != nil {
return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching following for uri %s: %s", requestedAccountURI.String(), err))
}
data, err := streams.Serialize(requestedFollowing)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
return data, nil
}
func (p *processor) GetFediStatus(requestedUsername string, requestedStatusID string, request *http.Request) (interface{}, gtserror.WithCode) {
// get the account the request is referring to
requestedAccount := &gtsmodel.Account{}
if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
}
// authenticate the request
requestingAccount, err := p.authenticateAndDereferenceFediRequest(requestedUsername, request)
if err != nil {
return nil, gtserror.NewErrorNotAuthorized(err)
}
// authorize the request:
// 1. check if a block exists between the requester and the requestee
blocked, err := p.db.Blocked(requestedAccount.ID, requestingAccount.ID)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
if blocked {
return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
}
// get the status out of the database here
s := &gtsmodel.Status{}
if err := p.db.GetWhere([]db.Where{
{Key: "id", Value: requestedStatusID},
{Key: "account_id", Value: requestedAccount.ID},
}, s); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting status with id %s and account id %s: %s", requestedStatusID, requestedAccount.ID, err))
}
visible, err := p.filter.StatusVisible(s, requestingAccount)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
if !visible {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("status with id %s not visible to user with id %s", s.ID, requestingAccount.ID))
}
// requester is authorized to view the status, so convert it to AP representation and serialize it
asStatus, err := p.tc.StatusToAS(s)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
data, err := streams.Serialize(asStatus)
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
return data, nil
}
func (p *processor) GetWebfingerAccount(requestedUsername string, request *http.Request) (*apimodel.WellKnownResponse, gtserror.WithCode) {
// get the account the request is referring to
requestedAccount := &gtsmodel.Account{}
if err := p.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
}
// return the webfinger representation
return &apimodel.WellKnownResponse{
Subject: fmt.Sprintf("acct:%s@%s", requestedAccount.Username, p.config.Host),
Aliases: []string{
requestedAccount.URI,
requestedAccount.URL,
},
Links: []apimodel.Link{
{
Rel: "http://webfinger.net/rel/profile-page",
Type: "text/html",
Href: requestedAccount.URL,
},
{
Rel: "self",
Type: "application/activity+json",
Href: requestedAccount.URI,
},
},
}, nil
}
func (p *processor) GetNodeInfoRel(request *http.Request) (*apimodel.WellKnownResponse, gtserror.WithCode) {
return &apimodel.WellKnownResponse{
Links: []apimodel.Link{
{
Rel: "http://nodeinfo.diaspora.software/ns/schema/2.0",
Href: fmt.Sprintf("%s://%s/nodeinfo/2.0", p.config.Protocol, p.config.Host),
},
},
}, nil
}
func (p *processor) GetNodeInfo(request *http.Request) (*apimodel.Nodeinfo, gtserror.WithCode) {
return &apimodel.Nodeinfo{
Version: "2.0",
Software: apimodel.NodeInfoSoftware{
Name: "gotosocial",
Version: p.config.SoftwareVersion,
},
Protocols: []string{"activitypub"},
Services: apimodel.NodeInfoServices{
Inbound: []string{},
Outbound: []string{},
},
OpenRegistrations: p.config.AccountsConfig.OpenRegistration,
Usage: apimodel.NodeInfoUsage{
Users: apimodel.NodeInfoUsers{},
},
Metadata: make(map[string]interface{}),
}, nil
}
func (p *processor) InboxPost(ctx context.Context, w http.ResponseWriter, r *http.Request) (bool, error) {
contextWithChannel := context.WithValue(ctx, util.APFromFederatorChanKey, p.fromFederator)
posted, err := p.federator.FederatingActor().PostInbox(contextWithChannel, w, r)
return posted, err
}