Question

如何通过Facebook Messenger API以图像的形式接收附件？他们的文档仅提供有关如何接收基于文本的消息的说明。

Answer 1

我不确定您使用什么语言对机器人进行编码，但因为您指的是facebook文档，其中大多数信使代码片段都在node.js中这是给你尝试的东西，让我知道这是否有帮助。

app.post('/webhook/', function (req, res) {
 //Getting the mesagess
 var messaging_events = req.body.entry[0].messaging;
  //Looping through all the messaging events
  for (var i = 0; i < messaging_events.length; i++) {
   var event = req.body.entry[0].messaging[i];
   //Checking for attachments
   if (event.message.attachments) {
    //Checking if there are any image attachments 
    if(atts[0].type === "image"){
     var imageURL = atts[0].payload.url;
     console.log(imageURL);
    }
   }
  }      
 }

Answer 2

2017年2月，我遇到了同样的问题，并且很难在很长一段时间内完成这项工作。原来，message.attachments作为对象进入，其中实际附件位于对象内。

结构如下：

附件对象＆gt; JSON响应＆gt;类型＆amp;有效负载＆gt; URL

app.post('/webhook/', function(req, res) {

  let messaging_events = req.body.entry[0].messaging

  for (let i = 0; i < messaging_events.length; i++) {
    let event = req.body.entry[0].messaging[i]
    let sender = event.sender.id

    // Check if it's a message
    if (event.message) {

      //Create the attachment
      let attachment = event.message.attachments

      // Here we access the JSON as object
      let object1 = attachment[0];

      //Here we access the payload property 
      let payload = object1.payload;

      // Finally we access the URL
      let url = payload.url;

      console.log(url)
    }         
    else if (event.message && event.message.text) {
       // Here you can handle the text 
       console.log("Just Text")
    } 

   }        
  res.sendStatus(200)
})

没有解释的更紧凑的版本看起来像这样：

  if (event.message) {
    let attachment = event.message.attachments
    console.log(attachment[0].payload.url)
  }

作为额外奖励，您还可以检查类型是否为图像。您可以通过添加执行此调整来实现此目的：

  if (event.message && ) {
    let attachment = event.message.attachments[0]
    if (attachment.type === "image") {
        console.log(attachment.payload.url)
    } 
  }

希望这有帮助，儒略

Answer 3

在PYTHON中，在Facebook聊天机器人中接收并保存图像附件时可以使用：

@app.route('/', methods=['POST'])
def webhook():   # endpoint for processing incoming messaging events

data = request.get_json()

if data["object"] == "page":

    for entry in data["entry"]:
        for messaging_event in entry["messaging"]:
             if messaging_event["message"].get("attachments"):
                 attachment_link = messaging_event["message"]["attachments"][0]["payload"]["url"]
              print("Image received, boss!")
              print(attachment_link)

好的聊天机器人！马可

Answer 4

在PHP中，

当用户将其设置为机器人时，我们得到的响应中包含附件type和url

{
  "object": "page",
  "entry": [
    {
      "id": "000000000000000",
      "time": 1511956708068,
      "messaging": [
        {
          "sender": {
            "id": "000000000000000"
          },
          "recipient": {
            "id": "000000000000000"
          },
          "timestamp": 1511956707862,
          "message": {
            "mid": "mid.$xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            "seq": 42172,
            "sticker_id": 369239263222822,
            "attachments": [
              {
                "type": "image",
                "payload": {
                  "url": "https:\/\/scontent.xx.fbcdn.net\/v\/t39.1997-6\/851557_369239266556155_759568595_n.png?_nc_ad=z-m&_nc_cid=0&oh=9058fb52f628d0a6ab92f85ea310db0a&oe=5A9DAADC",
                  "sticker_id": 369239263222822
                }
              }
            ]
          }
        }
      ]
    }
  ]
}

这是您从用户

获取不同类型的消息的方式

//get the response from user
$input     = json_decode(file_get_contents('php://input'), true);

//first check if attachment is present
$attachment = array_key_exists('attachments', $input['entry'][0]['messaging'][0]['message']);

//get the attachement type and url
$type     = $input['entry'][0]['messaging'][0]['message']['attachments'][0]['type'];
$file_url = $input['entry'][0]['messaging'][0]['message']['attachments'][0]['payload']['url'];

希望这有助于你

Answer 5

https://developers.facebook.com/docs/messenger-platform/implementation#receive_message

检查此链接。

它说，＆＃34;消息可能包含图像，视频或音频附件。＆＃34;

更新：

上述链接已被打破，因为Facebook最近以一个奇怪的降级版本更新了他们的文档，其中包含许多内容。

如评论中所指出的，当用户发送请求时，您的服务器将收到这样的json：

    {
        "mid": "some mid",
        "seq": 26,
        "attachments": [{
            "type": "image",
            "payload": {
                "url": "some image url"
            }
        }]
    }

您可以创建下载功能，将图像下载到服务器。

要使用此数据，如上所述，您可以使用webhook。

  app.post('/webhook', function (req, res) {
    var data = req.body;
    // Make sure this is a page subscription
    if (data.object == 'page') {
      console.log(data.entry);
      // Iterate over each entry
      // There may be multiple if batched
      data.entry.forEach(function(pageEntry) {
        var pageID = pageEntry.id;
        var timeOfEvent = pageEntry.time;

        // Iterate over each messaging event
        pageEntry.messaging.forEach(function(messagingEvent) {
          receivedMessage(messagingEvent);
        });
      });

      // Assume all went well.
      //
      // You must send back a 200, within 20 seconds, to let us know you've
      // successfully received the callback. Otherwise, the request will time out.
      res.sendStatus(200);
    }
  });


  function receivedMessage(event) {
    var senderID = event.sender.id;
    var recipientID = event.recipient.id;
    var timeOfMessage = event.timestamp;
    var message = event.message;

    if (senderID == PAGE_ID) {
      console.error("Sender is self.");
      return;
    }

    console.log("Received message for user %d and page %d at %d with message:",
      senderID, recipientID, timeOfMessage);
    console.log(JSON.stringify(message));

    var messageId = message.mid;

    // You may get a text or attachment but not both
    var messageText = message.text;
    var messageAttachments = message.attachments;

    if (messageText) {

      // If we receive a text message, check to see if it matches any special
      // keywords and send back the corresponding example. Otherwise, just echo
      // the text we received.


    } else if (messageAttachments) {
      messageAttachments.forEach(function(messageAttachment) {
        var attachmentUrl = messageAttachment.payload.url;
        console.log("Received Attachment");
        download(attachmentUrl);
    }
  }

此代码取自Facebook的示例代码。

如何在Facebook Messenger bot中接收图像

5 个答案: