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Implement or show how to upload files to your sketch #7

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hamoid opened this issue Nov 11, 2019 · 1 comment
Open

Implement or show how to upload files to your sketch #7

hamoid opened this issue Nov 11, 2019 · 1 comment

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@hamoid
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hamoid commented Nov 11, 2019

Hi! :) I was wondering if it's possible to upload files to the server?

I tried this:

import http.*;
import java.util.Map;

SimpleHTTPServer server;

void setup() {
  SimpleHTTPServer.useIndexHtml = false;
  server = new SimpleHTTPServer(this); 
  TemplateFileHandler templateHandler = new ResultFromPost("index.ftl");
  server.createContext("", templateHandler);
}

class ResultFromPost extends TemplateFileHandler {
  public ResultFromPost(String templateFileName) {
    super(templateFileName);
  }
  void createMap() {
    Map<String, String> params = queryToMap();
    println(params.get("image"));
  }
}

And this is the ftl

<!DOCTYPE html>
<html>
	<header></header>
	<body>
	<form  action="" method="post" enctype="multipart/form-data">
		<input type="file" name="image">
		<input type="submit" value="Upload" />
	</form>
	</body>
</html>

The data is there printed in the console, so that part works, but the data must be decoded. Does SimpleHTTPServer come with any helper functions for this?

A nice Example for this feature would be a tiny image gallery. Allow uploading images, and then show them as thumbnails in the html. Maybe convert them to black and white in Processing before saving them :)

Here some info about the decoding part:

https://stackoverflow.com/questions/3337056/convenient-way-to-parse-incoming-multipart-form-data-parameters-in-a-servlet
@transfluxus
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Owner

Hi,

I think there would be some things todo in the DynamicResponseHandler, which tells it that the method is post with content-type: multipart/form-data. The Handler (SHTTPSHandler) uses com.sun.net.httpserver.HttpExchange, for which I couldn't find anything that does that.
only the head can be derived like this, which could be the beginning:

DynamicResponseHandler responder1;

void setup() {
  SimpleHTTPServer.useIndexHtml = false;
  server = new SimpleHTTPServer(this); 
  TemplateFileHandler templateHandler = new ResultFromPost("index.ftl");
  server.createContext("", templateHandler);
  
  responder1 = new DynamicResponseHandler(new FileUpload(), "application/json");
  server.createContext("upload", responder1); 
}

class FileUpload extends ResponseBuilder {
    public  String getResponse(String requestBody) {
      //println(requestBody.split("\n")[0]);
      println(parent.getExchange().getRequestHeaders().values());
      return "";
    }
}

see: http://www.docjar.com/html/api/sun/net/httpserver/UnmodifiableHeaders.java.html

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@hamoid @transfluxus