[bugfix] Use punycode for host part of resource query param when doing webfinger requests (#3133)

* [bugfix] use punycode when webfingering

* account for punycode when checking if final URI matches expected

* hmm

* fix test

internal/util/puny_test.go

@@ -0,0 +1,101 @@
+// 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_test
+
+import (
+	"net/url"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+	"github.com/superseriousbusiness/gotosocial/testrig"
+)
+
+type PunyTestSuite struct {
+	suite.Suite
+}
+
+func (suite *PunyTestSuite) TestMatches() {
+	for i, testCase := range []struct {
+		expect *url.URL
+		actual []*url.URL
+		match  bool
+	}{
+		{
+			expect: testrig.URLMustParse("https://%D5%A9%D5%B8%D6%82%D5%A9.%D5%B0%D5%A1%D5%B5/@ankap"),
+			actual: []*url.URL{
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/users/ankap"),
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/@ankap"),
+			},
+			match: true,
+		},
+		{
+			expect: testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/@ankap"),
+			actual: []*url.URL{
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/users/ankap"),
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/@ankap"),
+			},
+			match: true,
+		},
+		{
+			expect: testrig.URLMustParse("https://թութ.հայ/@ankap"),
+			actual: []*url.URL{
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/users/ankap"),
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/@ankap"),
+			},
+			match: true,
+		},
+		{
+			expect: testrig.URLMustParse("https://թութ.հայ/@ankap"),
+			actual: []*url.URL{
+				testrig.URLMustParse("https://example.org/users/ankap"),
+				testrig.URLMustParse("https://%D5%A9%D5%B8%D6%82%D5%A9.%D5%B0%D5%A1%D5%B5/@ankap"),
+			},
+			match: true,
+		},
+		{
+			expect: testrig.URLMustParse("https://example.org/@ankap"),
+			actual: []*url.URL{
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/users/ankap"),
+				testrig.URLMustParse("https://xn--69aa8bzb.xn--y9a3aq/@ankap"),
+			},
+			match: false,
+		},
+	} {
+		matches, err := util.URIMatches(
+			testCase.expect,
+			testCase.actual...,
+		)
+		if err != nil {
+			suite.FailNow(err.Error())
+		}
+
+		if matches != testCase.match {
+			suite.Failf(
+				"case "+strconv.Itoa(i)+" matches not equal expected",
+				"wanted %t, got %t",
+				testCase.match, matches,
+			)
+		}
+	}
+}
+
+func TestPunyTestSuite(t *testing.T) {
+	suite.Run(t, new(PunyTestSuite))
+}