mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-27 17:40:32 +00:00
2cac5a4613
* [feature] Support Actor URIs for webfinger queries It's now possible to pass an Actor URI as the resource to query for when doing a webfinger query. The code now extracts the username and domain from the URI. The URI needs to be fully qualified, including having a scheme of http or https to be recognised as such. The acct scheme is handled as we used to, including dealing with an erroneous leading @ on the username. We retain the ability to handle resources without a scheme by parsing them again with the acct scheme if the original parse failed. This can happen due to parsing ambiguities when dealing with a string like user@domain.tld:port. * [bugfix] Remove debugging changes * [chore] Make TestExtractNamestring table-driven * [chore] Unnest Trim and Split for readability
123 lines
4.1 KiB
Go
123 lines
4.1 KiB
Go
// 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 util
|
|
|
|
import (
|
|
"fmt"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"github.com/superseriousbusiness/gotosocial/internal/regexes"
|
|
)
|
|
|
|
// ExtractNamestringParts extracts the username test_user and
|
|
// the domain example.org from a string like @test_user@example.org.
|
|
//
|
|
// If nothing is matched, it will return an error.
|
|
func ExtractNamestringParts(mention string) (username, host string, err error) {
|
|
matches := regexes.MentionName.FindStringSubmatch(mention)
|
|
switch len(matches) {
|
|
case 2:
|
|
return matches[1], "", nil
|
|
case 3:
|
|
return matches[1], matches[2], nil
|
|
default:
|
|
return "", "", fmt.Errorf("couldn't match mention %s", mention)
|
|
}
|
|
}
|
|
|
|
// ExtractWebfingerParts returns the username and domain from either an
|
|
// account query or an actor URI.
|
|
//
|
|
// All implementations in the wild generate webfinger account resource
|
|
// queries with the "acct" scheme and without a leading "@"" on the username.
|
|
// This is also the format the "subject" in a webfinger response adheres to.
|
|
//
|
|
// Despite this fact, we're being permissive about a single leading @. This
|
|
// makes a query for acct:user@domain.tld and acct:@user@domain.tld
|
|
// equivalent. But a query for acct:@@user@domain.tld will have its username
|
|
// returned with the @ prefix.
|
|
//
|
|
// We also permit a resource of user@domain.tld or @user@domain.tld, without
|
|
// a scheme. In that case it gets interpreted as if it was using the "acct"
|
|
// scheme.
|
|
//
|
|
// When parsing fails, an error is returned.
|
|
func ExtractWebfingerParts(webfinger string) (username, host string, err error) {
|
|
orig := webfinger
|
|
|
|
u, oerr := url.ParseRequestURI(webfinger)
|
|
if oerr != nil {
|
|
// Most likely reason for failing to parse is if the "acct" scheme was
|
|
// missing but a :port was included. So try an extra time with the scheme.
|
|
u, err = url.ParseRequestURI("acct:" + webfinger)
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("failed to parse %s with acct sheme: %w", orig, oerr)
|
|
}
|
|
}
|
|
|
|
if u.Scheme == "http" || u.Scheme == "https" {
|
|
return ExtractWebfingerPartsFromURI(u)
|
|
}
|
|
|
|
if u.Scheme != "acct" {
|
|
return "", "", fmt.Errorf("unsupported scheme: %s for resource: %s", u.Scheme, orig)
|
|
}
|
|
|
|
stripped := strings.TrimPrefix(u.Opaque, "@")
|
|
userDomain := strings.Split(stripped, "@")
|
|
if len(userDomain) != 2 {
|
|
return "", "", fmt.Errorf("failed to extract user and domain from: %s", orig)
|
|
}
|
|
return userDomain[0], userDomain[1], nil
|
|
}
|
|
|
|
// ExtractWebfingerPartsFromURI returns the user and domain extracted from
|
|
// the passed in URI. The URI should be an actor URI.
|
|
//
|
|
// The domain returned is the hostname, and the user will be extracted
|
|
// from either /@test_user or /users/test_user. These two paths match the
|
|
// "aliasses" we include in our webfinger response and are also present in
|
|
// our "links".
|
|
//
|
|
// Like with ExtractWebfingerParts, we're being permissive about a single
|
|
// leading @.
|
|
//
|
|
// Errors are returned in case we end up with an empty domain or username.
|
|
func ExtractWebfingerPartsFromURI(uri *url.URL) (username, host string, err error) {
|
|
host = uri.Host
|
|
if host == "" {
|
|
return "", "", fmt.Errorf("failed to extract domain from: %s", uri)
|
|
}
|
|
|
|
// strip any leading slashes
|
|
path := strings.TrimLeft(uri.Path, "/")
|
|
segs := strings.Split(path, "/")
|
|
if segs[0] == "users" {
|
|
username = segs[1]
|
|
} else {
|
|
username = segs[0]
|
|
}
|
|
|
|
username = strings.TrimPrefix(username, "@")
|
|
if username == "" {
|
|
return "", "", fmt.Errorf("failed to extract username from: %s", uri)
|
|
}
|
|
|
|
return
|
|
}
|