Upload file from Javascript Socket to Golang API (Gin Gonic)

[adriend45871304]

I am trying to upload a file to my server (Golang) from a photoshop script (javascript)

Here is the service reading the file on the server:

func Post(c *gin.Context) {
    // Read uploaded file
    file, header, err := c.Request.FormFile("file")
    if err != nil {
        c.JSON(utils.BuildError(err))
    }
    if file == nil {
        c.JSON(utils.BuildError(errors.New("no file provided")))
        return
    }
    // Get Client's informations ready to be processed
    var inputDTO InputDTO
    inputDTO.File = file
    inputDTO.Name = header.Filename
    c.JSON(utils.BuildResponse(inputDTO.addService()))
}

I tested it using this curl request and it works as expected:

curl -i -X POST -H "Content-Type: multipart/form-data" -F "file=@FILE.pdf" localhost:14000/api/v2/items

Result:

c.Request.Header => map[Content-Length:[787347] Expect:[100-continue] Content-Type:[multipart/form-data; boundary=------------------------b01a62679831e49b] User-Agent:[curl/7.46.0] Accept:[*/*]]
c.Request.Body => &{0xc0422a6000 0xc042280180 false false}
header => [some binary]
file => {0xc042080930}

Now, Photoshop javascript only allows the usage of Socket, so I use this script:

function sendDataToServerLocal(filepath, filename) {
    conn = new Socket;
    reply = "";

    // Read file
    var f = File(filepath);
    f.encoding = 'BINARY';
    f.open("r");
    var fContent = f.read();
    f.close();

    // Connect to server
    if (conn.open("127.0.0.1:14000", "BINARY")) {
        conn.timeout = 20000;
        boundary = Math.random().toString().substr(2);
        content = "--" + boundary
         + "Content-Disposition: form-data; name=\"file\"; filename=\"" + filename + ".pdf\"\n"
         + "Content-Type: application/octet-stream\n"
         + "\n"
         + fContent;

        cs = "POST /api/v2/items HTTP/1.1\n"
         + "Content-Length: " + content.length + "\n"
         + "Content-Type: multipart/form-data; charset=utf-8; boundary=" + boundary + "\n"
         + "Host: 127.0.0.1:14000\n"
         + "User-Agent: Apache-HttpClient/4.3.1 (java 1.5)\n"
         + "Accept: */*\n"
         + "Expect: 100-continue\n"
         + "\n"
         + content
         + "--" + boundary + "--\n"

        conn.write(cs);
        reply = conn.read(999999);
        conn.close();
        if (reply.indexOf("200 OK") > 0) {
            alert("File successfully uploaded!");
        } else {
            throw new Error("Error:" + reply);
        }
    } else {
        throw new Error("Can't connect to server");
    }
}

And I get the same nice request, but header and body are nil...

c.Request.Header => map[User-Agent:[Apache-HttpClient/4.3.1 (java 1.5)] Accept:[*/*] Expect:[100-continue] Content-Length:[787299] Content-Type:[multipart/form-data; boundary=XLuvdG51D_BRiiAda_0y79ImMN_ddtKYzeFFLlu8]]
c.Request.Body => &{0xc042278380 0xc04204e2c0 false false}
header => nil
file => nil

Any idea of why the file is nil when sent from the Socket?

Thank you!

[Davide_Barranca]

I've used GET request via Socket in the past, not POST. E.g.

var reply = "";
// The HTTP Request string
var req = "GET http://currentmillis.com/time/minutes-since-unix-epoch.php " +
          "HTTP/1.1\r\nHost: currentmillis.com\r\nConnection: close\r\n\r\n";
conn = new Socket();
if (conn.open("www.currentmillis.com:80", "binary")) { // 188.121.45.1
    conn.write(req);
        reply = conn.read(999999);
        $.writeln("Full Reply ---------------\n" + reply);
        conn.close();
        $.writeln("Minutes since Unix epoch: " +
             reply.substr(this.reply.indexOf("\r\n\r\n") + 7, 10));
}

Any chance you can use a CEP Panel, that would be easier...

Davide