initial commit

tests/integration/emoji_message_sanitization_dm_test.go

@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer 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.
+ *
+ * Fluxer 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 Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+func TestEmoji_MessageSanitization_DM(t *testing.T) {
+	client := newTestClient(t)
+	user := createTestAccount(t, client)
+	user2 := createTestAccount(t, client)
+	ensureSessionStarted(t, client, user.Token)
+
+	createFriendship(t, client, user, user2)
+	dmChannel := createDmChannel(t, client, user.Token, parseSnowflake(t, user2.UserID))
+	dmChannelID := parseSnowflake(t, dmChannel.ID)
+
+	t.Run("non-premium user has external emoji replaced with name", func(t *testing.T) {
+		content := "Hello <:external_emoji:999999999999999999>"
+
+		msg := sendChannelMessage(t, client, user.Token, dmChannelID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", dmChannelID, msg.ID), user.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if strings.Contains(result.Content, "<:external_emoji:") {
+			t.Error("expected custom emoji to be sanitized for non-premium user in DM")
+		}
+
+		if !strings.Contains(result.Content, ":external_emoji:") {
+			t.Error("expected emoji to be replaced with :name: format")
+		}
+	})
+
+	t.Run("non-premium user animated emoji replaced with name", func(t *testing.T) {
+		content := "Animated <a:dance:999999999999999999>"
+
+		msg := sendChannelMessage(t, client, user.Token, dmChannelID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", dmChannelID, msg.ID), user.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if strings.Contains(result.Content, "<a:dance:") {
+			t.Error("expected animated emoji to be sanitized for non-premium user")
+		}
+	})
+
+	t.Run("premium user can use external emoji in DM", func(t *testing.T) {
+		premiumUser := createTestAccount(t, client)
+		ensureSessionStarted(t, client, premiumUser.Token)
+		grantPremium(t, client, premiumUser.UserID, PremiumTypeSubscription)
+
+		guild := createGuild(t, client, premiumUser.Token, "Emoji Guild")
+		guildID := parseSnowflake(t, guild.ID)
+		emoji := createGuildEmoji(t, client, premiumUser.Token, guildID, "premium_emoji")
+
+		createFriendship(t, client, premiumUser, user2)
+		premiumDM := createDmChannel(t, client, premiumUser.Token, parseSnowflake(t, user2.UserID))
+		premiumDMID := parseSnowflake(t, premiumDM.ID)
+
+		content := fmt.Sprintf("Premium test <:premium_emoji:%s>", emoji.ID)
+		msg := sendChannelMessage(t, client, premiumUser.Token, premiumDMID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", premiumDMID, msg.ID), premiumUser.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if !strings.Contains(result.Content, "<:premium_emoji:") {
+			t.Errorf("expected premium user message to contain custom emoji, got: %s", result.Content)
+		}
+	})
+
+	t.Run("emoji in code block preserved", func(t *testing.T) {
+		content := "Look at this: `<:code_emoji:123456789>`"
+
+		msg := sendChannelMessage(t, client, user.Token, dmChannelID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", dmChannelID, msg.ID), user.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if !strings.Contains(result.Content, "`<:code_emoji:123456789>`") {
+			t.Error("expected emoji in code block to be preserved")
+		}
+	})
+
+	t.Run("emoji in triple backtick code block preserved", func(t *testing.T) {
+		content := "```\n<:block_emoji:123456789>\n```"
+
+		msg := sendChannelMessage(t, client, user.Token, dmChannelID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", dmChannelID, msg.ID), user.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if !strings.Contains(result.Content, "<:block_emoji:123456789>") {
+			t.Error("expected emoji in code block to be preserved")
+		}
+	})
+
+	t.Run("unicode emoji allowed", func(t *testing.T) {
+		content := "Hello 👋 world 🌍"
+
+		msg := sendChannelMessage(t, client, user.Token, dmChannelID, content)
+
+		resp, err := client.getWithAuth(fmt.Sprintf("/channels/%d/messages/%s", dmChannelID, msg.ID), user.Token)
+		if err != nil {
+			t.Fatalf("failed to fetch message: %v", err)
+		}
+		defer resp.Body.Close()
+		assertStatus(t, resp, http.StatusOK)
+
+		var result struct {
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, resp, &result)
+
+		if !strings.Contains(result.Content, "👋") {
+			t.Error("expected unicode emoji to be preserved")
+		}
+	})
+}