Santosh Sahoo toshsan

Data Serialization Formats

JSON, MessagePack, and Google's Protocol Buffers are all awesome. Here's how they're awesome on different client environments and how to use them on your rails env.

Some links:

JSON: http://json.org/
MsgPack: http://msgpack.org/
ProtoBufs: https://code.google.com/p/protobuf/

Output from Ruby Client:

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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Better SSH Authorized Keys Management

A seemingly common problem that people encounter is how to handle all of your users authorized_keys file.

People struggle over management, ensuring that users only have specific keys in the authorized_keys file or even a method for expiring keys. A centralized key management system could help provide all of this functionality with a little scripting.

One piece of functionality overlooked in OpenSSH is the AuthorizedKeysCommand configuration keyword. This configuration allows you to specify a command that will run during login to retrieve a users public key file from a remote source and perform validation just as if the authorized_keys file was local.

Here is an example directory structure for a set of users with SSH public keys that can be shared out via a web server:

	class Graph:
	def __init__(self):
	self.nodes = set()
	self.edges = defaultdict(list)
	self.distances = {}

	def add_node(self, value):
	self.nodes.add(value)

	def add_edge(self, from_node, to_node, distance):

	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>collab editing, yo</title>
	<link rel="stylesheet" href="http://codemirror.net/lib/codemirror.css">
	<link rel="stylesheet" href="http://codemirror.net/theme/ambiance.css">
	<script src="http://codemirror.net/lib/codemirror.js"></script>
	<script src="http://codemirror.net/addon/mode/overlay.js"></script>
	<script src="http://codemirror.net/mode/xml/xml.js"></script>

	1033edge.com
	11mail.com
	123.com
	123box.net
	123india.com
	123mail.cl
	123qwe.co.uk
	126.com
	150ml.com
	15meg4free.com

	// Live video stream management for HTML5 video. Uses FFMPEG to connect to H.264 camera stream,
	// Camera stream is remuxed to a MP4 stream for HTML5 video compatibility and segments are recorded for later playback
	var liveStream = function (req, resp) { // handle each client request by instantiating a new FFMPEG instance
	// For live streaming, create a fragmented MP4 file with empty moov (no seeking possible).

	var reqUrl = url.parse(req.url, true)
	var cameraName = typeof reqUrl.pathname === "string" ? reqUrl.pathname.substring(1) : undefined;
	if (cameraName) {
	try {
	cameraName = decodeURIComponent(cameraName);

	var w = require('whoisclient');

	var tld = '.com';
	var arr = ["google","apple","superlongnottakendomain"];

	whoisList(arr, function(data) {
	console.log("We found one: " + data + tld);
	});

	function isNotTaken(data) {

	var mediaJSON = { "categories" : [ { "name" : "Movies",
	"videos" : [
	{ "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org",
	"sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ],
	"subtitle" : "By Blender Foundation",
	"thumb" : "images/BigBuckBunny.jpg",
	"title" : "Big Buck Bunny"
	},
	{ "description" : "The first Blender Open Movie from 2006",
	"sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ],

	var AWS = require('aws-sdk');

	AWS.config.update({
	accessKeyId: '{AWS_KEY}',
	secretAccessKey: '{AWS_SECRET}',
	region: '{SNS_REGION}'
	});

	var sns = new AWS.SNS();