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/*
GoToSocial
Copyright (C) 2021-2022 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"
"strings"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/federation"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
)
func GetParseMentionFunc(dbConn db.DB, federator federation.Federator) gtsmodel.ParseMentionFunc {
return func(ctx context.Context, targetAccount string, originAccountID string, statusID string) (*gtsmodel.Mention, error) {
// get the origin account first since we'll need it to create the mention
originAccount, err := dbConn.GetAccountByID(ctx, originAccountID)
if err != nil {
return nil, fmt.Errorf("couldn't get mention origin account with id %s", originAccountID)
}
// A mentioned account looks like "@test@example.org" or just "@test" for a local account
// -- we can guarantee this from the regex that targetAccounts should have been derived from.
// But we still need to do a bit of fiddling to get what we need here -- the username and domain (if given).
// 1. trim off the first @
trimmed := strings.TrimPrefix(targetAccount, "@")
// 2. split the username and domain
split := strings.Split(trimmed, "@")
// 3. if it's length 1 it's a local account, length 2 means remote, anything else means something is wrong
var local bool
switch len(split) {
case 1:
local = true
case 2:
local = false
default:
return nil, fmt.Errorf("mentioned account format '%s' was not valid", targetAccount)
}
var username, domain string
username = split[0]
if !local {
domain = split[1]
}
// 4. check we now have a proper username and domain
if username == "" || (!local && domain == "") {
return nil, fmt.Errorf("username or domain for '%s' was nil", targetAccount)
}
var mentionedAccount *gtsmodel.Account
if local {
localAccount, err := dbConn.GetLocalAccountByUsername(ctx, username)
if err != nil {
return nil, err
}
mentionedAccount = localAccount
} else {
remoteAccount := >smodel.Account{}
where := []db.Where{
{
Key: "username",
Value: username,
CaseInsensitive: true,
},
{
Key: "domain",
Value: domain,
CaseInsensitive: true,
},
}
err := dbConn.GetWhere(ctx, where, remoteAccount)
if err == nil {
// the account was already in the database
mentionedAccount = remoteAccount
} else {
// we couldn't get it from the database
if err != db.ErrNoEntries {
// a serious error has happened so bail
return nil, fmt.Errorf("error getting account with username '%s' and domain '%s': %s", username, domain, err)
}
// We just don't have the account, so try webfingering it.
//
// If the mention originates from our instance we should use the username of the origin account to do the dereferencing,
// otherwise we should just use our instance account (that is, provide an empty string), since obviously we can't use
// a remote account to do remote dereferencing!
var fingeringUsername string
if originAccount.Domain == "" {
fingeringUsername = originAccount.Username
}
acctURI, err := federator.FingerRemoteAccount(ctx, fingeringUsername, username, domain)
if err != nil {
// something went wrong doing the webfinger lookup so we can't process the request
return nil, fmt.Errorf("error fingering remote account with username %s and domain %s: %s", username, domain, err)
}
resolvedAccount, err := federator.GetRemoteAccount(ctx, fingeringUsername, acctURI, true, true)
if err != nil {
return nil, fmt.Errorf("error dereferencing account with uri %s: %s", acctURI.String(), err)
}
// we were able to resolve it!
mentionedAccount = resolvedAccount
}
}
mentionID, err := id.NewRandomULID()
if err != nil {
return nil, err
}
return >smodel.Mention{
ID: mentionID,
StatusID: statusID,
OriginAccountID: originAccount.ID,
OriginAccountURI: originAccount.URI,
TargetAccountID: mentionedAccount.ID,
NameString: targetAccount,
TargetAccountURI: mentionedAccount.URI,
TargetAccountURL: mentionedAccount.URL,
OriginAccount: mentionedAccount,
}, nil
}
}
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