Mashup Guide

Continuing on Mashup Guide :: listing keys with S3Ajax, here I present a Chickenfoot script to create a bucket and upload a file (specifically, it creates a bucket by the name of raymondyeetest and uploads a file (D:\Document\PersonalInfoRemixBook\examples\ch16\Exported Items.rdf from my WinXP machine) to the key exportitems.rdf in the bucket:

include("D:\\document\\JavaScriptLib\\sha1.js");
include("D:\\document\\JavaScriptLib\\S3Ajax.js");

var AWSAccessKeyId = "[AWSAccessKeyId]";
var AWSSecretAccessKey = "[AWSSecretAccessKey]";

S3Ajax.URL = 'http://s3.amazonaws.com';
S3Ajax.DEBUG = true;
S3Ajax.KEY_ID = AWSAccessKeyId;
S3Ajax.SECRET_KEY = AWSSecretAccessKey;

// function to read contents from a file

function read_file_contents(aFileURL) {
  // https://developer.mozilla.org/en/Code_snippets/File_I%2f%2fO#Binary_File

  var ios = Components.classes["@mozilla.org/network/io-service;1"]
                      .getService(Components.interfaces.nsIIOService);
  var url = ios.newURI(aFileURL, null, null);

  if (!url || !url.schemeIs("file")) throw "Expected a file URL.";
  var bFile = url.QueryInterface(Components.interfaces.nsIFileURL).file;
  var istream = Components.classes["@mozilla.org/network/file-input-stream;1"]
                          .createInstance(Components.interfaces.nsIFileInputStream);
  istream.init(bFile, -1, -1, false);
  var bstream = Components.classes["@mozilla.org/binaryinputstream;1"]
                          .createInstance(Components.interfaces.nsIBinaryInputStream);
  bstream.setInputStream(istream);
  var bytes = bstream.readBytes(bstream.available());
  return bytes;

}

// create a bucket

var newBucketName = 'raymondyeetest';

S3Ajax.createBucket(newBucketName, function() {
    output("created a buicket: " + newBucketName);
    s3_list();
}, function () {
      output ("error in createBucket");
   }
);

// add a key to a bucket

var fileURL = 'file:///D:/Document/PersonalInfoRemixBook/examples/ch16/Exported%20Items.rdf'
var content = read_file_contents(fileURL);
alert(content);

S3Ajax.put(newBucketName , "exportitems.rdf", content,
    {
       content_type: "application/xml; charset=UTF-8",
       meta:  {'creator':'Raymond Yee'},
       acl:    "public-read",
    },
    function(req) {
        output("Upload succeeded");
    },
    function(req, obj) {
        output("Upload failed");
    }
);

A few things to note about this code:

• read_file_contents() doesn't strike me as a terribly elegant way of reading contents from a file — but that's what I have working for now
• a tricky part of getting this to work was to note that in FF 3.x,  charset=UTF-8 is automatically tacked on to content-type HTTP request header in a xmlhttprequest — I don't know how to change the charset or whether you can — and why UTF-8 is being tacked on.  But figuring out the charset was crucial to getting this working since the content-type HTTP header is used in the calculation of the Amazon S3 signature.