Possibility of attaching files instead of using URLS

[aurasphere]

Currently the reply factory object will allow only to attach files using URLS (audio, video, images and generic files attachments). Facebook API's also allows to upload a file directly. It would be nice to add this feature to the framework. Here's an instance of how to do it with cURL: https://developers.facebook.com/docs/messenger-platform/send-api-reference/audio-attachment.
In order to do this with FaceBot, we should add a method that makes a POST with multipart/data.
I've made some tests with Postman and the API works even if you don't specify the extension of file you are attaching, so we don't need to add that.

[aurasphere]

I'm having some troubles on this. I've tried this:

        public static void postFormDataMessage(String recipient,
		AttachmentType type, File file) {
	String pageToken = FaceBotContext.getInstance().getPageToken();
	// If the page token is invalid, returns.
	if (!validatePageToken(pageToken)) {
		return;
	}

	// TODO: add checks for valid attachmentTypes (FILE, AUDIO or VIDEO)
	HttpPost post = new HttpPost(FaceBotConstants.FACEBOOK_BASE_URL
			+ FaceBotConstants.FACEBOOK_MESSAGES_URL + pageToken);

	FileBody filedata = new FileBody(file);
	StringBody recipientPart = new StringBody("{\"id\":\"" + recipient
			+ "\"}", ContentType.MULTIPART_FORM_DATA);
	StringBody messagePart = new StringBody("{\"attachment\":{\"type\":\""
			+ type.name().toLowerCase() + "\", \"payload\":{}}}",
			ContentType.MULTIPART_FORM_DATA);
	MultipartEntityBuilder builder = MultipartEntityBuilder.create();
	builder.addPart("recipient", recipientPart);
	builder.addPart("message", messagePart);
	builder.addBinaryBody("filedata", file);
	builder.setContentType(ContentType.MULTIPART_FORM_DATA);

	HttpEntity entity = builder.build();
	post.setEntity(entity);
	
	send(post);
}

But I'm getting an error about the attached file not supported. If I do the same request from postman it works though. I think the problem is related to the headers. This is the request generated by postman:

		HTTP/1.1
		Host: graph.facebook.com
		Cache-Control: no-cache
		Postman-Token: 6469ec4e-4622-7a93-7a9c-f428db6f4fcd
		Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

		------WebKitFormBoundary7MA4YWxkTrZu0gW
		Content-Disposition: form-data; name="recipient"

		{"id":"1545768135449437"}
		------WebKitFormBoundary7MA4YWxkTrZu0gW
		Content-Disposition: form-data; name="message"

		{"attachment":{"type":"audio", "payload":{}}}
		------WebKitFormBoundary7MA4YWxkTrZu0gW
		Content-Disposition: form-data; name="filedata"; filename=""
		Content-Type: 


		------WebKitFormBoundary7MA4YWxkTrZu0gW--

As you can see the Content-Type of the file data (the last part) is empty here, meanwhile the one generated with Apache Http is application/octet-stream and I don't really know how to leave it empty.

Any help is appreciated.

[alvin-reyes]

It seems that the UploadAPI should resolve this issue. Please close if so.

[aurasphere]

I think they are 2 different features but I have to look more into it. Meanwhile, I've opened this question on StackOverflow.