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Log non-matching verification tokens in registration #297

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Merged
kzu merged 1 commit into from
Sep 14, 2025
Merged

Log non-matching verification tokens in registration #297

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5 changes: 4 additions & 1 deletion src/WhatsApp/AzureFunctionsWebhook.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Primitives;
using static Microsoft.IO.RecyclableMemoryStreamManager;

namespace Devlooped.WhatsApp;
Expand Down Expand Up @@ -181,8 +182,9 @@ async Task<IActionResult> ProcessFlowDataAsync(string json, EncryptedFlowData en
[Function("whatsapp_register")]
public IActionResult Register([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "whatsapp")] HttpRequest req)
{
StringValues token = default;
if (req.Query.TryGetValue("hub.mode", out var mode) && mode == "subscribe" &&
req.Query.TryGetValue("hub.verify_token", out var token) && token == metaOptions.Value.VerifyToken &&
req.Query.TryGetValue("hub.verify_token", out token) && token == metaOptions.Value.VerifyToken &&
req.Query.TryGetValue("hub.challenge", out var values) &&
values.ToString() is { } challenge)
{
Expand All @@ -191,6 +193,7 @@ public IActionResult Register([HttpTrigger(AuthorizationLevel.Anonymous, "get",
return new OkObjectResult(challenge);
}

logger.LogError("Received token {ACTUAL} but expected {EXPECTED}.", token, metaOptions.Value.VerifyToken);
return new BadRequestObjectResult("Received verification token doesn't match the configured one.");
}
}
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