[feature] Account alias / move API + db models (#2518)

* [feature] Account alias / move API + db models

* go fmt

* fix little cherry-pick issues

* update error checking, formatting

* add and use new util functions to simplify alias logic

internal/processing/account/alias_test.go

@@ -0,0 +1,161 @@
+// 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 account_test
+
+import (
+	"context"
+	"slices"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+type AliasTestSuite struct {
+	AccountStandardTestSuite
+}
+
+func (suite *AliasTestSuite) TestAliasAccount() {
+	for _, test := range []struct {
+		newAliases      []string
+		expectedAliases []string
+		expectedErr     string
+	}{
+		// Alias zork to turtle.
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+			},
+		},
+		// Alias zork to admin.
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/admin",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/admin",
+			},
+		},
+		// Alias zork to turtle AND admin.
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+			},
+		},
+		// Same again (noop).
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+			},
+		},
+		// Remove admin alias.
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+			},
+		},
+		// Clear aliases.
+		{
+			newAliases:      []string{},
+			expectedAliases: []string{},
+		},
+		// Set bad alias.
+		{
+			newAliases:  []string{"oh no"},
+			expectedErr: "invalid also_known_as_uri (oh no) provided in account alias request: uri must not be empty and scheme must be http or https",
+		},
+		// Try to alias to self (won't do anything).
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/the_mighty_zork",
+			},
+			expectedAliases: []string{},
+		},
+		// Try to alias to self and admin
+		// (only non-self alias will work).
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/the_mighty_zork",
+				"http://localhost:8080/users/admin",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/admin",
+			},
+		},
+		// Alias zork to turtle AND admin,
+		// duplicates should be removed.
+		{
+			newAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+				"http://localhost:8080/users/admin",
+			},
+			expectedAliases: []string{
+				"http://localhost:8080/users/1happyturtle",
+				"http://localhost:8080/users/admin",
+			},
+		},
+	} {
+		var (
+			ctx      = context.Background()
+			testAcct = new(gtsmodel.Account)
+		)
+
+		// Copy zork test account.
+		*testAcct = *suite.testAccounts["local_account_1"]
+
+		apiAcct, err := suite.accountProcessor.Alias(ctx, testAcct, test.newAliases)
+		if err != nil {
+			if err.Error() != test.expectedErr {
+				suite.FailNow("", "unexpected error: %s", err)
+			} else {
+				continue
+			}
+		}
+
+		if !slices.Equal(apiAcct.Source.AlsoKnownAsURIs, test.expectedAliases) {
+			suite.FailNow("", "unexpected aliases: %+v", apiAcct.Source.AlsoKnownAsURIs)
+		}
+	}
+}
+
+func TestAliasTestSuite(t *testing.T) {
+	suite.Run(t, new(AliasTestSuite))
+}