initial commit

tests/integration/webhook_emoji_bypass_test.go

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+/*
+ * 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 TestWebhook_EmojiBypas(t *testing.T) {
+	client := newTestClient(t)
+	user := createTestAccount(t, client)
+	ensureSessionStarted(t, client, user.Token)
+
+	guild := createGuild(t, client, user.Token, "Webhook Emoji Test Guild")
+	guildID := parseSnowflake(t, guild.ID)
+
+	emoji := createGuildEmoji(t, client, user.Token, guildID, "external")
+	animatedEmoji := createGuildEmojiWithFile(t, client, user.Token, guildID, "animated", "thisisfine.gif", "image/gif")
+	waitEmoji := createGuildEmoji(t, client, user.Token, guildID, "wait_emoji")
+
+	resp, err := client.getWithAuth(fmt.Sprintf("/guilds/%d", guildID), user.Token)
+	if err != nil {
+		t.Fatalf("failed to get guild: %v", err)
+	}
+	var guildData struct {
+		SystemChannelID string `json:"system_channel_id"`
+	}
+	decodeJSONResponse(t, resp, &guildData)
+	resp.Body.Close()
+	systemChannelID := parseSnowflake(t, guildData.SystemChannelID)
+
+	webhookPayload := map[string]any{
+		"name": "Emoji Test Webhook",
+	}
+
+	webhookResp, err := client.postJSONWithAuth(
+		fmt.Sprintf("/channels/%d/webhooks", systemChannelID),
+		webhookPayload,
+		user.Token,
+	)
+	if err != nil {
+		t.Fatalf("failed to create webhook: %v", err)
+	}
+	defer webhookResp.Body.Close()
+	assertStatus(t, webhookResp, http.StatusOK)
+
+	var webhook struct {
+		ID    string `json:"id"`
+		Token string `json:"token"`
+	}
+	decodeJSONResponse(t, webhookResp, &webhook)
+
+	t.Run("webhook can use external emoji without sanitization", func(t *testing.T) {
+		messagePayload := map[string]any{
+			"content": fmt.Sprintf("Webhook message <:external:%s> <a:animated:%s>", emoji.ID, animatedEmoji.ID),
+		}
+
+		executeResp, err := client.postJSON(
+			fmt.Sprintf("/webhooks/%s/%s", webhook.ID, webhook.Token),
+			messagePayload,
+		)
+		if err != nil {
+			t.Fatalf("failed to execute webhook: %v", err)
+		}
+		defer executeResp.Body.Close()
+
+		if executeResp.StatusCode != http.StatusOK && executeResp.StatusCode != http.StatusNoContent {
+			t.Errorf("expected webhook to succeed, got %d", executeResp.StatusCode)
+		}
+
+		if executeResp.StatusCode == http.StatusOK {
+			var msg struct {
+				Content string `json:"content"`
+			}
+			decodeJSONResponse(t, executeResp, &msg)
+
+			if !strings.Contains(msg.Content, "<:external:") {
+				t.Error("expected webhook to preserve emoji format, but emoji was sanitized")
+			}
+			if !strings.Contains(msg.Content, "<a:animated:") {
+				t.Error("expected webhook to preserve animated emoji format, but emoji was sanitized")
+			}
+		}
+	})
+
+	t.Run("webhook can use non-existent emoji", func(t *testing.T) {
+		messagePayload := map[string]any{
+			"content": "Fake emoji <:doesnotexist:123456789012345678>",
+		}
+
+		executeResp, err := client.postJSON(
+			fmt.Sprintf("/webhooks/%s/%s", webhook.ID, webhook.Token),
+			messagePayload,
+		)
+		if err != nil {
+			t.Fatalf("failed to execute webhook: %v", err)
+		}
+		defer executeResp.Body.Close()
+
+		if executeResp.StatusCode != http.StatusOK && executeResp.StatusCode != http.StatusNoContent {
+			t.Errorf("expected webhook with fake emoji to succeed, got %d", executeResp.StatusCode)
+		}
+	})
+
+	t.Run("webhook emoji in code block", func(t *testing.T) {
+		messagePayload := map[string]any{
+			"content": "Code: `<:code_emoji:111111111111111111>`",
+		}
+
+		executeResp, err := client.postJSON(
+			fmt.Sprintf("/webhooks/%s/%s", webhook.ID, webhook.Token),
+			messagePayload,
+		)
+		if err != nil {
+			t.Fatalf("failed to execute webhook: %v", err)
+		}
+		defer executeResp.Body.Close()
+
+		if executeResp.StatusCode != http.StatusOK && executeResp.StatusCode != http.StatusNoContent {
+			t.Errorf("expected webhook to succeed, got %d", executeResp.StatusCode)
+		}
+	})
+
+	t.Run("webhook wait parameter returns message", func(t *testing.T) {
+		messagePayload := map[string]any{
+			"content": fmt.Sprintf("Wait test <:wait_emoji:%s>", waitEmoji.ID),
+		}
+
+		executeResp, err := client.postJSON(
+			fmt.Sprintf("/webhooks/%s/%s?wait=true", webhook.ID, webhook.Token),
+			messagePayload,
+		)
+		if err != nil {
+			t.Fatalf("failed to execute webhook: %v", err)
+		}
+		defer executeResp.Body.Close()
+		assertStatus(t, executeResp, http.StatusOK)
+
+		var msg struct {
+			ID      string `json:"id"`
+			Content string `json:"content"`
+		}
+		decodeJSONResponse(t, executeResp, &msg)
+
+		if msg.ID == "" {
+			t.Error("expected message ID with wait=true")
+		}
+
+		if !strings.Contains(msg.Content, "<:wait_emoji:") {
+			t.Error("expected webhook to preserve emoji format with wait=true")
+		}
+	})
+}