验证 Slack 请求答案

【问题标题】：Verify Slack request验证 Slack 请求
【发布时间】：2019-07-10 23:14:21
【问题描述】：

我正在 Slack 上创建一条交互式消息，因此当您单击一个按钮时，它会将值返回给我的 API。我在验证响应时遇到问题here。

如果我使用文档中的值作为示例，我的测试通过了，但如果我使用真实的响应正文，它会失败。我认为它可能导致错误的唯一原因是没有正确检索响应正文。

示例数据如下：

token=xyzz0WbapA4vBCDEFasx0q6G&team_id=T1DC2JH3J&team_domain=testteamnow&channel_id=G8PSS9T3V&channel_name=foobar&user_id=U2CERLKJA&user_name=roadrunner&command=%2Fwebhook-collect&text=&response_url=https%3A%2F%2Fhooks.slack.com%2Fcommands%2FT1DC2JH3J%2F397700885554%2F96rGlfmibIGlgcZRskXaIFfN&trigger_id=398738663015.47445629121.803a0bc887a14d10d2c447fce8b6703c

但我的数据看起来像一个 json 对象：

{""type"":""block_actions"",""team"":{""id"":""TKAKBLC56"",""domain"":""removed""},""user"":{""id"":""UJZ6URSMR"",""username"":""removed"",""name"":""removed"",""team_id"":""removed""},""api_app_id"":""removed"",""token"":""removed"",""container"":{""type"":""message"",""message_ts"":""1562642155.000100"",""channel_id"":""CKCEGGARM"",""is_ephemeral"":false},""trigger_id"":""693043647686.656657692176.b781b587db5dde32e149e03e3442d5ec"",""channel"":{""id"":""CKCEGGARM"",""name"":""general""},""message"":{""type"":""message"",""subtype"":""bot_message"",""text"":""test1"",""ts"":""1562642155.000100"",""username"":""removed"",""bot_id"":""BKE0G32UX"",""blocks"":[{""type"":""actions"",""block_id"":""O4i1"",""elements"":[{""type"":""button"",""action_id"":""DKC"",""text"":{""type"":""plain_text"",""text"":""Farmhouse"",""emoji"":true},""value"":""click_me_123""},{""type"":""button"",""action_id"":""rRVe1"",""text"":{""type"":""plain_text"",""text"":""Kin Khao"",""emoji"":true},""value"":""click_me_123""},{""type"":""button"",""action_id"":""3nT"",""text"":{""type"":""plain_text"",""text"":""Ler Ros"",""emoji"":true},""value"":""click_me_123""}]}]},""response_url"":""https:\/\/hooks.slack.com\/actions\/TKAKBLC56\/690896030256\/yAQ7AGoHcX8HgTcQQH1YnmOM"",""actions"":[{""action_id"":""DKC"",""block_id"":""O4i1"",""text"":{""type"":""plain_text"",""text"":""Farmhouse"",""emoji"":true},""value"":""click_me_123"",""type"":""button"",""action_ts"":""1562799606.639327""}]}

更新：

我的操作方法如下所示：

[HttpPost]
public IHttpActionResult ProcessResponse(FormDataCollection response)
{
    var rawPayload = response.Get("payload");

    var slackSignature = Request.Headers.GetValues("X-Slack-Signature").FirstOrDefault();
    var timestampString = Request.Headers.GetValues("X-Slack-Request-Timestamp").FirstOrDefault();

    if (slackSignature.IsNullOrWhiteSpace() || timestampString.IsNullOrWhiteSpace()) return Unauthorized();

    if (!int.TryParse(timestampString, out int timestamp)) return BadRequest();

    if (DateTimeOffset.Now.ToUnixTimeSeconds() - timestamp > 60 * 5) return BadRequest();

    var signingSecret = ConfigurationManager.AppSettings["SlackSigningSecret"];

    var isValid = uSlack.Security.Security.IsValidSlackSignature(timestamp, rawPayload, slackSignature, signingSecret);

    return Ok();
}

我没有将代码放在 IsValidSlackSignature 方法中，因为它实际上是在处理 Slack 的演示数据。

【问题讨论】：

您需要将整个请求正文作为字符串。不管是 url 编码还是 JSON。
如果您将当前代码添加到问题中，我们可以讨论详细信息
谢谢，我已经添加了处理响应的操作方法。
您需要包含计算签名的请求的完整主体，而不仅仅是payload属性中的数据。
换句话说：payload 属性是需要用于签名的正文字符串的一部分。整个身体应该看起来像payload= %7B%22%22type...

标签： .net slack slack-api

【解决方案1】：

在您的代码中，您仅包含有效负载属性的数据作为计算签名的基础：

var rawPayload = response.Get("payload");

但您需要包含完整的正文，包括有效负载属性。

【讨论】：

为了更清楚，我用var rawBody = await Request.Content.ReadAsStringAsync();得到了全身