Let's reverse-engineer Omegle. PROPERLY!
========================================
I didn't manage to find a proper, detailed (and up-to-date) reverse-engineerment
of Omegle's text chat protocol on the interwebs, so here, have one!  
The responses are beautified and the query strings split up and URI-decoded for
readability.  
Note that "query string" refers to parameters encoded into the URL and
"form data" to parameters in the request body, which don't have to be encoded.

TODO:
* Find out how college authorization works
* Find out how WebRTC video streaming works
* Generally phrase things better

Used Request Headers:
```
Accept: application/json
Accept-Encoding: gzip,deflate
Accept-Language: en-US;q=0.6,en;q=0.4
Connection: keep-alive
DNT: 1
Host: front9.omegle.com
Origin: http://www.omegle.com
Referer: http://www.omegle.com/
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36
```


Status
------
Pro-Tip: Fetch this first and then use one of the servers listed for future
connections. You can just connect to the main server here.

`GET http://[server].omegle.com/status`

Query String:
* `nocache = 0.4695589093025774` (optional, random nonce to prevent cached responses from being sent)
* `randid = CHPZGFFW` (optional, see section "Start")

Response:
```
{
    "count": 20840, (connection count, people say it's faked)
    "force_unmon": true, (see section "Getting b&")
    "antinudeservers": [
        "waw3.omegle.com", "waw2.omegle.com", "waw1.omegle.com"
    ],
    "antinudepercent": 1.0,
    "spyQueueTime": 0.0, (if spyQueueTime is larger, there are more spies than spyees online, which the client uses to suggest a mode)
    "spyeeQueueTime": 2.173300027847,
    "timestamp": 1409233880.7561221,
    "servers": [
        "front5.omegle.com", "front1.omegle.com", "front2.omegle.com",
        "front9.omegle.com", "front6.omegle.com", "front7.omegle.com",
        "front8.omegle.com", "front4.omegle.com", "front3.omegle.com"
    ]
}
```


Start
-----
This actually starts the chat and gets us our client ID. If you want to start
a question/spy chat, send `wantsspy = 1` for spyee mode and `ask = blah` for
spyer mode.

`POST http://[server].omegle.com/start`

Query String:
* `rcs = 1`
* `firstevents = 1`
* `m = 1` (imitate a mobile connection, shouldn't really matter)
* `lang = en` (two-char language code)
* `randid = CHPZGFFW` (this is really just a random string containing 2-9 and A-Z)
* `spid =` (some kind of ID from Adobe Stratus, never used though)
* `topics = ["asdf", "test", ...]` (optional, for default mode)
* `wantsspy = 1` (for spyee mode)
* `ask = blah question?` (for spyer mode)
* `cansavequestion = 1` (Omegle may reuse your question)
* `group = unmon` (join the unmonitored section instead)

Response:
```
{
    "events": [
        ...see section "Events"...
    ],
    "clientID": "central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh" (needed for all subsequent requests)
}
```


Events
------
This one uses long polling, which means that the server will be blocking the
connection until an event happens. You can handle this with some async magic and
long timeouts.

`POST http://[server].omegle.com/events`

Form Data:
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`

Response:
```
[
    [...see below...], ...
]
```

### Status events
* `["waiting"]` (the server is searching for strangers)
* `["connected"]` (you can start sending messages now)
* `["statusInfo", {...stripped...}]` (see section "Status")

### Notifications
* `["commonLikes", ["asdf", "test", ...]]` (the shared topics from the ones you've passed)
* `["serverMessage", "blah"]` (most likely `You both speak the same language.`)
* `["recaptchaRequired", "[challenge]"]` (see section "ReCAPTCHAs")
* `["recaptchaRejected", "[challenge]"]`
* `["identDigests", "blah,blah,blah"]` (probably just used for sharing logs)

### Error events (disconnects you)
* `["error", "blah blah error text!"]` (general error message)
* `["connectionDied"]` (some technical error)
* `["antinudeBanned"]` (see section "Getting b8")

### Chat events
* `["typing"]` (the stranger started typing)
* `["stoppedTyping"]` (...stopped typing)
* `["gotMessage", "blah"]` (...sent a message)
* `["strangerDisconnected"]` (...decided to disconnect)

### In spyee mode
* `["question", "blah?"]` (the question you'll discuss with the stranger)

### In spyer mode
* `["question", "blah question?"]` (your question)
* `["spyTyping", "Stranger <1/2>"]` (Stranger 1/2 started typing)
* `["spyStoppedTyping", "Stranger <1/2>"]` (...stopped typing)
* `["spyMessage", "Stranger <1/2>", "blah"]` (...sent a message)
* `["spyDisconnected", "Stranger <1/2>"]` (...decided to disconnect)


Send messages
-------------
I'm not sure about the Unicode support, but it should work in most cases.

`POST http://[server].omegle.com/send`

Form Data:
* `msg = lol`
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`

Response:
```
win
```


Set your "typing" status
------------------------
The server may detect clients that don't send these.

`POST http://[server].omegle.com/typing`  
`POST http://[server].omegle.com/stoppedtyping`

Form Data:
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`

Response:
```
win
```


Stop looking for common topics
------------------------------
If you've passed `topics` to `/start`, the server will send the `waiting` event
and then search for people with the same topics until this gets posted.
Use this to stop the running search, ignore the topics and continue with connecting.

`POST http://[server].omegle.com/stoplookingforcommonlikes`

Form Data:
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`

Response:
```
win
```


Disconnect from the current chat
--------------------------------
Simple as that. Always use this to end sessions gracefully, unless noted beneath
events.

`POST http://[server].omegle.com/disconnect`

Form Data:
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`

Response:
```
win
```


ReCAPTCHAS
----------
If you run into an `recaptchaRequired` event, you must prove that you're a
human by fetching the captcha using the URL-encoded passed code from
`http://www.google.com/recaptcha/api/image?c=[challenge]` and sending the answer
like this. Note that I haven't tried this yet.

`POST http://[server].omegle.com/recaptcha`

Form Data:
* `id = central2:k0m4akq5ry4ytvklsrs2jmtsjkpbkh`
* `challenge = [challenge]`
* `response = [answer]`


Getting b&
----------
If you got an `antinudeBanned` event, chances are that the moderators banned you
from the monitored section for "bad behaviour". This also applies if the server
status object (see section "Status") has `force_unmon` set as `true`. You can
retry by passing `group = unmon` to `/start`. That won't work if you got your IP
banned because of too rapid connecting or advertising, though.


Sharing logs
------------
To upload your logs to Omegles server, use this.  
Pro-Tip: You can actually pass any arbitrary text as the log (note the double
brackets though). The first item is always the header, ("You're chatting with a
random stranger on Omegle!") and the last the footer ("You have disconnected.").
If the second item is "Question to discuss:", it will be styled with the third
item to resemble the question box on the web client. Lines starting with "You:"
and "Stranger:" will be coloured blue/red.

`POST http://logs.omegle.com/generate`

Form Data:
* `logs = [["blah",...]]` (JSON table of the plaintext chat, split in lines)
* `randid = CHPZGFFW` (Your random ID)
* `topics = ["asdf", "test", ...]` (optional, the shared topics)
* `identdigests = blah,blah,blah` (the most recent data from the `identDigests` event)
* `host = 1`

Response: 302 Found, the `Location` header contains the log link.