如何通过 Facebook Messenger API 接收图片形式的附件？ 他们的文档仅提供有关如何接收基于文本的消息的说明。
【问题讨论】：
我不确定您使用什么语言来编写您的机器人，但因为您指的是 facebook 文档，其中大多数信使代码 sn-ps 都在 node.js 中 这里有一些东西供你尝试，如果有帮助，请告诉我。
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);
}
}
}
}
【讨论】：
request.message.attachments[0].payload.url.
2017 年 2 月，我遇到了同样的问题，并且在很长一段时间内都在努力解决这个问题。原来message.attachments 作为对象出现，实际附件在对象内。
结构如下：
附件对象 > JSON 响应 >Type & Payload > 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如下所示：
if (event.message) {
let attachment = event.message.attachments
console.log(attachment[0].payload.url)
}
作为额外的奖励，您还可以检查类型是否为图像。您可以通过添加此调整来实现：
if (event.message && ) {
let attachment = event.message.attachments[0]
if (attachment.type === "image") {
console.log(attachment.payload.url)
}
}
希望这会有所帮助， 朱利安
【讨论】：
在 PYTHON 中接收图像附件并将其保存在您的 facebook 聊天机器人中：
@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)
很好的聊天机器人！ 马可
【讨论】：
在 PHP 中，
当用户将其发送给机器人时，我们会得到下面的响应，其中包含附件 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
}
}
]
}
}
]
}
]
}
这是您从用户那里获得不同类型消息的方式
//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'];
希望对你有帮助
【讨论】：
https://developers.facebook.com/docs/messenger-platform/implementation#receive_message
查看此链接。
它说， “消息可能带有图像、视频或音频附件。”
更新：
上述链接已损坏，因为 Facebook 最近将其文档更新为一个奇怪的降级版本，其中许多内容丢失。
正如评论中指出的那样详细说明，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"
}
}]
}
您也许可以创建一个下载函数来将图像下载到您的服务器。
要使用这些数据，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。
【讨论】：