SendGrid - NoMethodError（未定义的方法 `[]'，用于 nil:NilClass）

cultiv · 2025 年2 月 23 日 08:48

您弄清楚这个问题了吗？我遇到了同样的错误，在同一行代码上：

app/controllers/webhooks_controller.rb

main


      
          end
          
          def sendgrid
            if SiteSetting.sendgrid_verification_key.present?
              return signature_failure if !valid_sendgrid_signature?
            else
              Rails.logger.warn(
                "Received a Sendgrid webhook, but no verification key has been configured. This is unsafe behaviour and will be disallowed in the future.",
              )
            end
          
            events = params["_json"] || [params]
            events.each do |event|
              message_id = Email::MessageIdService.message_id_clean((event["smtp-id"] || ""))
              to_address = event["email"]
              error_code = event["status"]
          
              if event["event"] == "bounce"
                # Sendgrid does not provide status field for emails that can't be delivered due to the recipient's server not existing
                # so we set the error code to 5.1.2 which translates to permanent failure bad destination system address.
                error_code = "5.1.2" if !error_code && event["type"] == "blocked"

我不熟悉 Ruby，但它似乎可以很好地解析 JSON，直到尝试解析错误代码 Email::SMTP_STATUS_TRANSIENT_FAILURE 指向：

github.com/discourse/discourse

lib/email.rb

main


      
          # frozen_string_literal: true
          
          require "mail"
          
          module Email
            # See https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml#smtp-enhanced-status-codes-1
            SMTP_STATUS_SUCCESS = "2."
            SMTP_STATUS_TRANSIENT_FAILURE = "4."
            SMTP_STATUS_PERMANENT_FAILURE = "5."
          
            def self.is_valid?(email)
              return false unless String === email
              EmailAddressValidator.valid_value?(email)
            end
          
            def self.downcase(email)
              return email unless Email.is_valid?(email)
              email.downcase

我在 Webhook.site 上检查了 Sendgrid 在我测试 Webhook 时实际发送的内容，对于弹跳，它看起来像这样：

[
  {
    "email": "example@test.com",
    "timestamp": 1740136261,
    "smtp-id": "<14c5d75ce93.dfd.64b469@ismtpd-555>",
    "event": "bounce",
    "category": [
      "cat facts"
    ],
    "sg_event_id": "ovGQ2rRo8ytNezHPDq-7Ig==",
    "sg_message_id": "14c5d75ce93.dfd.64b469.filter0001.16648.5515E0B88.0",
    "reason": "500 unknown recipient",
    "status": "5.0.0"
  }
]

看起来应该可以工作！

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SendGrid - NoMethodError（未定义的方法 `[]'，用于 nil:NilClass）

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