Recording video/audio from video conferencing calls

If you’re looking to use this repo to retrieve video or audio streams from meeting platforms like Zoom, Google Meet, Microsoft Teams, consider checking out Recall.ai, an API for meeting recording.

zoomer - Bot library for Zoom meetings

Good bot support is part of what makes Discord so nice to use. Unfortunately, the official Zoom API is basically only useful for scheduling meetings and using Zoom Chat, not for making in-meeting bots. So I decided to bring this feature to Zoom myself.

Here is a demo of a basic, ~130 lines of code bot:

WEB SDK

I created this by reverse engineering the Zoom Web SDK. Regular web joins are captcha-gated but web SDK joins are not. I use an API only used by the Web SDK to get tokens needed to join the meeting. This means you need a Zoom API key/secret, specifically a "Meeting SDK" one. These can be obtained on the Zoom App Marketplace site: click Meeting SDK (Create) -> name app, disable publishing to marketplace -> fill descriptions and contact information with anything you want -> click App Credentials. The demo at cmd/zoomer/main.go reads these from the environment as ZOOM_API_KEY and ZOOM_API_SECRET.

NOTE

Because the API keys are associated with your account, using this software may get your Zoom account banned (reverse engineering is against the Zoom Terms of Service). Please do not use this on an important account.

PLAY WITH DEMO

$ go get github.com/chris124567/zoomer
$ cd $GOPATH/src/github.com/chris124567/zoomer
$ scripts/build.sh
$ ZOOM_API_KEY="xxx" ZOOM_API_SECRET="xxx" ./zoomer -meetingNumber xxxxx -password xxxxx

Feel free to use the demo as a template. If you want to use the library elsewhere just import github.com/chris124567/zoomer/pkg/zoom.

DEMO WALKTHROUGH

See the comments in cmd/zoomer/main.go

FEATURES / SUPPORTED MESSAGE TYPES

Feature	Send/recv	Message Name	Function (if send) / struct type (if recv)	Host Required	Tested
Send a chat message	Send	WS_CONF_CHAT_REQ	ZoomSession.SendChatMessage	No	Yes
Pretend to "join audio"	Send	WS_AUDIO_VOIP_JOIN_CHANNEL_REQ	ZoomSession.JoinAudioVoipChannel	No	Yes
Pretend to turn on/off video (if enabled camera indicator appears to be on but actually just shows a black screen)	Send	WS_VIDEO_MUTE_VIDEO_REQ	ZoomSession.SetVideoMuted	No	Yes
Pretending to screen share (shows "x" is sharing their screen but is just a black screen)	Send	WS_CONF_SET_SHARE_STATUS_REQ	ZoomSession.SetScreenShareMuted	Depending on share settings	Yes
Pretend to turn on/off audio (if enabled audio indicator appears to be on but no audio is actually outputted)	Send	WS_AUDIO_MUTE_REQ	ZoomSession.SetAudioMuted	No	Yes
Rename self	Send	WS_CONF_RENAME_REQ	ZoomSession.RenameMe	Depending on settings	Yes
Rename others	Send	WS_CONF_RENAME_REQ	ZoomSession.RenameById	Yes	No
Request everyone mutes themselves	Send	WS_AUDIO_MUTEALL_REQ	ZoomSession.RequestAllMute	Yes	No
Set mute upon entry status	Send	WS_CONF_SET_MUTE_UPON_ENTRY_REQ	ZoomSession.SetMuteUponEntry	Yes	No
Set allow unmuting audio	Send	WS_CONF_ALLOW_UNMUTE_AUDIO_REQ	ZoomSesssion.SetAllowUnmuteAudio	Yes	No
Set allow participant renaming	Send	WS_CONF_ALLOW_PARTICIPANT_RENAME_REQ	ZoomSession.SetAllowParticipantRename	Yes	No
Set chat restrictions level	Send	WS_CONF_CHAT_PRIVILEDGE_REQ	ZoomSession.SetChatLevel	Yes	Yes
Set screen sharing locked status	Send	WS_CONF_LOCK_SHARE_REQ	ZoomSession.SetShareLockedStatus	Yes	No
End meeting	Send	WS_CONF_END_REQ	ZoomSession.EndMeeting	Yes	No
Set allow unmuting video	Send	WS_CONF_ALLOW_UNMUTE_VIDEO_REQ	ZoomSession.SetAllowUnmuteVideo	Yes	No
Request breakout room join token	Send	WS_CONF_BO_JOIN_REQ	ZoomSession.RequestBreakoutRoomJoinToken	No	Yes
Breakout room broadcast	Send	WS_CONF_BO_BROADCAST_REQ	ZoomSession.BreakoutRoomBroadcast	Yes	No
Request a token for creation of a breakout room	Send	WS_CONF_BO_TOKEN_BATCH_REQ	ZoomSession.RequestBreakoutRoomToken	Yes	Yes
Create a breakout room	Send	WS_CONF_BO_START_REQ	ZoomSession.CreateBreakoutRoom	Yes	No
Join information (user ID, participant ID and some other stuff)	Recv	WS_CONF_JOIN_RES	JoinConferenceResponse		Yes
Breakout room creation token response (response to WS_CONF_BO_TOKEN_BATCH_REQ)	Recv	WS_CONF_BO_TOKEN_RES	ConferenceBreakoutRoomTokenResponse		Yes
Breakout room join response	Recv	WS_CONF_BO_JOIN_RES	ConferenceBreakoutRoomJoinResponse		Yes
Permission to show avatars changed	Recv	WS_CONF_AVATAR_PERMISSION_CHANGED	ConferenceAvatarPermissionChanged		Yes
Roster change (mute/unmute, renames, leaves/joins)	Recv	WS_CONF_ROSTER_INDICATION	ConferenceRosterIndication		Yes
Meeting attribute setting (stuff like "is sharing allowed" or "is the meeting locked")	Recv	WS_CONF_ATTRIBUTE_INDICATION	ConferenceAttributeIndication		Yes
Host change	Recv	WS_CONF_HOST_CHANGE_INDICATION	ConferenceHostChangeIndication		Yes
Cohost change	Recv	WS_CONF_COHOST_CHANGE_INDICATION	ConferenceCohostChangeIndication		Yes
"Hold" state (waiting rooms)	Recv	WS_CONF_HOLD_CHANGE_INDICATION	ConferenceHoldChangeIndication		Yes
Chat message	Recv	WS_CONF_CHAT_INDICATION	ConferenceChatIndication		Yes
Meeting "option" parameter (used for waiting room and breakout rooms)	Recv	WS_CONF_OPTION_INDICATION	ConferenceOptionIndication		Yes
??? Local Record Indication ???	Recv	WS_CONF_LOCAL_RECORD_INDICATION	ConferenceLocalRecordIndication		Yes
Breakout room command (forcing you to join a room, broadcasts)	Recv	WS_CONF_BO_COMMAND_INDICATION	ConferenceBreakoutRoomCommandIndication		Yes
Breakout room attributes (settings and list of rooms)	Recv	WS_CONF_BO_ATTRIBUTE_INDICATION	ConferenceBreakoutRoomAttributeIndication		Yes
Datacenter Region	Recv	WS_CONF_DC_REGION_INDICATION	ConferenceDCRegionIndication		Yes
??? Audio Asn ???	Recv	WS_AUDIO_ASN_INDICATION	AudioAsnIndication		Yes
??? Audio Ssrc ???	Recv	WS_AUDIO_SSRC_INDICATION	AudioSSRCIndication		Yes
Someone has enabled video	Recv	WS_VIDEO_ACTIVE_INDICATION	VideoActiveIndication		Yes
??? Video Ssrc ???	Recv	WS_VIDEO_SSRC_INDICATION	SSRCIndication		Yes
Someone is sharing their screen	Recv	WS_SHARING_STATUS_INDICATION	SharingStatusIndication		Yes

Note that you are free to construct your own message types for any I have not implemented.

For sending: Look at zoom/requests.go and switch out the struct and message type names for your new message type

For receiving: Create a definition for the type and update the getPointerForBody function in zoom/message.go.

INFORMATION ON PROTOCOL

The protocol used by the Zoom Web client is basically just JSON over Websockets. The messages look something like this:

{"body":{"bCanUnmuteVideo":true},"evt":7938,"seq":44}
{"body":{"add":null,"remove":null,"update":[{"audio":"","bAudioUnencrytped":false,"id":16785408}]},"evt":7937,"seq":47}
{"body":{"add":null,"remove":null,"update":[{"caps":5,"id":16785408,"muted":true}]},"evt":7937,"seq":63}
{"body":{"dc":"the United States(SC)","network":"Zoom Global Network","region":"the United States"},"evt":7954,"seq":3}

The "evt" number specifies the event number. There is a (mostly complete) list of these in zoom/constant.go that I extracted from javascript code on the meeting page.

For the above three messages, the types are:

WS_CONF_ATTRIBUTE_INDICATION                     = 7938 // ConferenceAttributeIndication
WS_CONF_ROSTER_INDICATION                        = 7937 // ConferenceRosterIndication
WS_CONF_DC_REGION_INDICATION                     = 7954 // ConferenceDCRegionIndication

The thing in the comments to the right is the struct type for that message, which can be found in zoom/message_types.go.

Also, the server and client both have sequence numbers ("seq") for the messages they send but it doesn't appear to be used for anything (?).

TODO (DESCENDING ORDER OF PRIORITY)

• Gracefully exit/disconnect
• Organize zoom/message_types.go and general refactoring
• Support for meetings where you don't have the password but just a Zoom url with the "pwd" parameter in it (anyone know anything about this??)
• Thoroughly test things
• Make it more extensible
• Joining breakout room support
• More comments and documentation
• Support audio/video

REMARK ON MAINTENANCE AND STABILITY

This is hobbyist software that has no guarantees of being maintained or supported. Please don't use it anywhere near production.