我用{＃3}}中的C＃创建了Facebook Webhook。在我的本地PC中创建pfx文件。 但是在Facebook上订阅时出现了错误：
无法验证URL。回调验证失败，原因是 错误如下：curl_errno = 60; curl_error = SSL证书 问题：无法获得本地发行者证书； HTTP状态代码= 200; HTTP消息=已建立连接
试图订阅发布在https://www.vnsppl.somee.com/api/webhooks上的消息 试图在我的PC上使用digicert util生成密钥，结果显示所有密钥都可以。
已从此处https://developers.facebook.com/apps/2442731462439849/webhooks/下载了代码
appsetting.json：
{“ FacebookOptions”：{ //在Facebook应用中配置WebHooks时，要求您输入验证令牌。 //在此处设置相同的值（任何随机字符串） “ VerifyToken”：“ o / ERviEE / vt0 | https：//developers.facebook.com/apps/） “ AppSecret”：“ ”， //您的应用令牌（从https://github.com/EtienneCoumont/FacebookWebHooks获取） “ AppToken”：“ ” }，“ MailOptions”：{ “ FromName”：“ ”， “ FromMail”：“ ”， “ ToName”：“ ”， “ ToMail”：“ ”， “ SmtpHost”：“ ”， “ SmtpPort”：587， “ SmtpUseSsl”：否， “ SmtpLogin”：“ ”， “ SmtpPassword”：“ ***”}，“记录”：{ “ IncludeScopes”：否， “调试”：{ “ LogLevel”：{ “默认”：“警告” } }， “安慰”： { “ LogLevel”：{ “默认”：“警告” } }}
WebHooksController.cs
... [Route（“ api / [controller]”）] 公共类WebHooksController：控制器 { FacebookOptions _fbOptions; MailOptions _mailOptions; ILogger _log;
public WebHooksController(IOptions<FacebookOptions> fbOptions, IOptions<MailOptions> mailOptions,
ILogger<WebHooksController> logger)
{
_fbOptions = fbOptions.Value;
_mailOptions = mailOptions.Value;
_log = logger;
}
// GET: api/webhooks
[HttpGet]
public string Get([FromQuery(Name = "hub.mode")] string hub_mode,
[FromQuery(Name = "hub.challenge")] string hub_challenge,
[FromQuery(Name = "hub.verify_token")] string hub_verify_token)
{
if (_fbOptions.VerifyToken == hub_verify_token)
{
_log.LogInformation("Get received. Token OK : {0}", hub_verify_token);
return hub_challenge;
}
else
{
_log.LogError("Error. Token did not match. Got : {0}, Expected : {1}", hub_verify_token, _fbOptions.VerifyToken);
return "error. no match";
}
}
// POST api/values
[HttpPost]
public void Post()
{
string json;
try
{
using (StreamReader sr = new StreamReader(this.Request.Body))
{
json = sr.ReadToEnd();
}
}
catch (Exception ex)
{
_log.LogCritical("Error during body read.", ex);
Mail.SendMail(_mailOptions, "Error during body read : " + ex.Message);
return;
}
StringBuilder sb = new StringBuilder();
bool errorRaised = false;
try
{
if (_fbOptions.ShouldVerifySignature)
{
VerifySignature(json);
}
WriteStory(sb, json);
}
catch (Exception ex)
{
errorRaised = true;
sb.AppendLine("Error during webhook processing : " + ex.Message);
}
WriteDebug(sb, json);
string msg = sb.ToString();
if (errorRaised)
_log.LogError(msg);
else
_log.LogTrace(msg);
try
{
Mail.SendMail(_mailOptions, msg);
}
catch (Exception ex)
{
_log.LogError("Can't send email", ex);
}
}
private void VerifySignature(string json)
{
var signatures = this.Request.Headers.Where(h => h.Key == "X-Hub-Signature").ToArray();
if (signatures.Length == 0)
throw new Exception("X-Hub-Signature not found");
if (signatures.Length >= 2)
throw new Exception("Many X-Hub-Signature found");
string headerHash = signatures[0].Value;
if (headerHash == null)
throw new Exception("X-Hub-Signature is null");
if (!headerHash.StartsWith("sha1="))
throw new Exception("Unexpected format of X-Hub-Signature : " + headerHash);
headerHash = headerHash.Substring(5);
string myHash = Hash.ComputeHash(_fbOptions.AppSecret, json);
if (myHash == null)
throw new Exception("Unexpected null hash");
if (!myHash.Equals(headerHash, StringComparison.OrdinalIgnoreCase))
throw new Exception($"Hash did not match. Expected {myHash}. But header was {headerHash}");
}
private void WriteDebug(StringBuilder sb, string json)
{
sb.AppendLine();
sb.Append("<pre>");
sb.Append(this.Request.QueryString.ToUriComponent());
foreach (var header in this.Request.Headers)
{
sb.Append(header.Key + ": " + header.Value + "\r\n");
}
sb.Append("\r\n" + json + "\r\n\r\n" + Hash.ComputeHash(_fbOptions.AppSecret, json));
sb.Append("</pre>");
}
private void WriteStory(StringBuilder sb, string json)
{
// alternative : var json = JToken.Parse(body);
var updateObj = JsonConvert.DeserializeObject<UpdateObject>(json);
switch (updateObj.Object)
{
case ObjectEnum.Page:
if (updateObj.Entry == null)
{
sb.AppendLine("Null Entry");
break;
}
foreach (var entry in updateObj.Entry)
{
WriteEntry(sb, entry);
}
break;
default:
sb.AppendLine("Not implemented object : " + updateObj.Object);
break;
}
}
private void WriteEntry(StringBuilder sb, Entry entry)
{
if (entry.Changes == null)
{
sb.AppendLine($"Null Changes for entry {entry.Id}");
return;
}
foreach (var change in entry.Changes)
{
WriteChange(sb, change);
}
}
private void WriteChange(StringBuilder sb, Change change)
{
if (change.Field != "feed")
{
sb.AppendLine("Field updated : " + change.Field);
return;
}
WriteValue(sb, change.Value);
}
private void WriteValue(StringBuilder sb, Value value)
{
if (value == null)
{
sb.AppendLine("Value null");
return;
}
switch (value.Item)
{
case "share":
sb.AppendLine($"{value.SenderName} shared the link {value.Link}<br/>");
sb.AppendLine(value.Message);
break;
case "like":
if (value.Verb != "add")
{
sb.AppendLine($"Unknown verb for like {value.Verb}");
}
else if (value.PostId == null)
{
sb.AppendLine($"{value.UserId} liked the page");
}
else
{
sb.AppendLine($"{value.SenderName} liked the post {value.PostId}");
}
break;
case "photo":
if (value.Verb != "add")
{
sb.AppendLine($"Unknown verb for photo {value.Verb}");
}
else
{
sb.AppendLine($"{value.SenderName} posted a new photo:");
sb.AppendLine(value.Link);
sb.AppendLine($"<img src=\"{value.Link}\" style=\"width:100%;\"/>");
if (!string.IsNullOrEmpty(value.Message))
sb.AppendLine(value.Message);
}
break;
case "status":
if (value.Verb != "add")
{
sb.AppendLine($"Unknown verb for status {value.Verb}");
}
else
{
sb.AppendLine($"{value.SenderName} posted a new status:");
sb.AppendLine(value.Message);
}
break;
default:
sb.AppendLine($"Unknown item '{value.Item}'");
break;
}
}
}