AWS SDK Smart Package -- Exposes the SDK as AWS.SDK and provides a helper function to sign URLs

aws-sdk.js

AWS = (function () {

	var SDK = Npm.require("aws-sdk");
	var crypto = Npm.require("crypto");
	var url = Npm.require("url");

	function getAuthenticatedURL(fullUrl, accessKeyID, secretAccessKey, expires) {
		/*
		Signature = URL-Encode( Base64( HMAC-SHA1( YourSecretAccessKeyID, UTF-8-Encoding-Of( StringToSign ) ) ) );

		StringToSign = HTTP-VERB + "\n" +
		    Content-MD5 + "\n" +
		    Content-Type + "\n" +
		    Expires + "\n" +
		    CanonicalizedAmzHeaders +
		    CanonicalizedResource;
		*/

		var stringToSign, hmac, authUrl, matches, signature;
		var urlObj = url.parse(fullUrl);
		var hostname = urlObj.hostname;
		var pathname = urlObj.pathname;

		matches = hostname.match(/^(.+?)\.s3\.amazonaws\.com$/);
		if (matches[1]) {
			pathname = "/" + matches[1] + pathname;
		}

		expires = expires || 2145916800;
		stringToSign = "GET\n\n\n" + expires + "\n" + pathname;
		hmac = crypto.createHmac("sha1", secretAccessKey);
		hmac.update(stringToSign);
		signature = hmac.digest("base64");

		urlObj.search	= "AWSAccessKeyId=" + accessKeyID
						+ "&Expires=" + expires
						+ "&Signature=" + encodeURIComponent(signature);

		authUrl = url.format(urlObj);

		return authUrl;
	}

	return {
		SDK: SDK,
		getAuthenticatedURL: getAuthenticatedURL
	};

})();

package.js

Npm.depends({"aws-sdk": "0.9.5-pre.6"});

Package.describe({
	summary: "AWS SDK"
});

Package.on_use(function (api, where) {
	api.add_files("aws-sdk.js", "server");
});