Notes.txt

PLANS:
-----
- Implement MSE (Media Source Extension) for synced, smooth playback of high-bandwidth and long videos - instead of current, crappy sync hax
- Statistically find lyrics in comments / description
- Different Layouts (Music-focussed with playlist, lyrics, etc. and Video-focussed)
- Subtitles support (custom)

BROWSING MECHANISM:
-------------------
- First page load gives csn (client-screen-nonce)
- Loading subsequent pages with csn set gives access to raw, small JSON
	1. Get URL as youtube.com$URL
	2. Get URL Hash:
		for (var hash = 0, c = 0; c < URL.length; ++c)
			hash = 31 * hash + URL.charCodeAt(c) >>> 0;
	3. Set cookie 'ST-$hash' to session-data 'itct=...&csn=...'
	4. Download URL with cookie as JSON
	5. Response automatically deletes cookie
	6. Set csn to new csn contained in response JSON
- IDEA: Get pages always as JSON with csn
	- ALWAYS get csn first from small page
	- /feed/history or /feed/library are smallest with just over 200kb
- DONT DO - session data is actually pretty stupid to get, itct is specific for every link in a page - which means, it only works visiting pages that are referenced in the current page - also, there's other stuff involved for some other pages (most notably search). Don't bother for that bit of extra data transferred

IMPORTANT KEYS:
---------------
ID_TOKEN (some youtube player id, looks important and is set as request headers, but can be omitted)
VISITOR_DATA (no idea but it's a key - maybe, a key to success?)
XSRF_TOKEN (required in request body as session_token=XSRF_TOKEN
INNERTUBE_CONTEXT_CLIENT_NAME (required in request headers as x-youtube-client-name)
INNERTUBE_CONTEXT_CLIENT_VERSION (required in request headers as x-youtube-client-version)
INNERTUBE_API_KEY (used a lot in tracking requests)
EI (playbackTracking ID, used for some stats and some content fetches - stored elsewhere in page)


SUSPECTED LIST OF AJAX COMMANDS:
--------------------------------

list_ajax (excluding style=json/style=xml)
GET    /list_ajax?action_get_list=1 &list= &index=						WORKS
GET    /list_ajax?action_get_user_uploads_by_user=1 &username=			WORKS - NEEDS USER, NOT CHANNEL!!
																				unsure what the general way to find it is
GET    /list_ajax?action_get_templist=1 &video_ids=,,,,					NOT GOTTEN TO WORK

search_ajax (excluding style=json/style=xml)
GET    /search_ajax?embeddable=1 &search_query= &index=					WORKS

comment_service_ajax (needs parameters ctoken, continuation and itct plus xsrf-token as session data in body)
POST   /comment_service_ajax?action_get_video_preview=1 &video_id=
POST   /comment_service_ajax?action_get_comment_replies=1 &pbj=1	WORKS
POST   /comment_service_ajax?action_get_comments=1 &pbj=1    		WORKS

channels_profile_ajax (NOT TESTED / NOT INTERESTED)
GET  ? /channels_profile_ajax?action_get_business_email_captcha=1
POST   /channels_profile_ajax?action_update_banner_image=1      postParams:b WITH b.crop_top=a.top,b.crop_right=a.right,b.crop_bottom=a.bottom,b.crop_left=a.left AND is_gallery_image:"ytbanner"==b

notifications_ajax (BODY very complex set of parameters)
POST   /notifications_ajax?action_get_registration_token=1		WITH CREDENTIALS
POST   /notifications_ajax?action_register_device=1        		WITH BODY AND CREDENTIALS
POST   /notifications_ajax?action_convert_endpoint_to_url=1     WITH BODY AND CREDENTIALS
POST   /notifications_ajax?action_notification_click=1    		WITH BODY AND CREDENTIALS
POST   /notifications_ajax?action_get_notifications=1        	WITH BODY AND CREDENTIALS
- Can be substituted by own notification system: channels supply RSS feed

playlist_video_ajax (NOT TESTED)
POST   playlist_video_ajax?action_"+a+"=1" 
		WITH feature  -  authuser  -  pageId  -  add_to_playlists  -  plid=(PlaybackID)
		WITH video_ids  -  source_playlist_id  -  full_list_id  -  delete_from_playlists  -  add_to_playlists  -  plid=(PlaybackID)
		MAYBE: playlist_video_ajax?action_delete_from_playlist=1 &video_ids=,,, &source_playlist_id=

subscription_ajax 	(Alternative /subscription_service or smth?)
POST   /subscription_ajax?action_update_subscription_preferences=1 &channel_id= &receive_all_updates=

guide_ajax	(Loads the lefthandside bar with channels/playlists etc. when logged in)
GET    /guide_ajax?action_load_guide=1

EXTRA
- CreateListCommand: /service_ajax
	onCreateListCommand:{commandMetadata:{webCommandMetadata:{url:"/service_ajax",sendPost:!0}},createPlaylistServiceEndpoint:{videoIds:[],hack:!0,params:"CAQ%3D"}};
- /live_chat_push_config_ajax