Vibe.d: Implementing file upload with WEB interface

[aberba via Digitalmars-d-learn]

So I implemented a file upload at 
https://aberba.github.io/2016/form-upload-in-vibe-d/. I'm trying 
to understand how HTTPServerRequest req.files can be accessed 
when using the web interface (Porting the same example to use 
vibe.d WEB interface).

I couldn't find the implementation details in the vibed.org docs 
either.

import vibe.d;

static this()
{
    auto router = new URLRouter;
    router.get("*", staticTemplate!"index.dt");
    router.post("/upload", &upload);

    auto settings = new HTTPServerSettings;
    settings.port = 8080;
    settings.bindAddresses = ["::1", "127.0.0.1"];
    listenHTTP(settings, router);

    logInfo("Server Running");
}

void upload(HTTPServerRequest req, HTTPServerResponse res)
{

    // File upload here
    auto file = "document" in req.files;
    try {
        moveFile(file.tempPath, Path("./public/uploads") ~ 
file.filename);
        logInfo("Uploaded successfully!");
    } catch (Exception e) {
        logInfo("Exception thrown, trying copy");
        copyFile(file.tempPath, Path("./public/uploads") ~ 
file.filename);
    }

    res.redirect("/");
}