# Baileys - WhatsApp Web API for Node.js

 Reverse Engineered WhatsApp Web API in pure Node.js. Baileys does not require Selenium or any other browser to be interface with WhatsApp Web, it does so directly using a WebSocket. Not running Selenium or Chromimum saves you like half a gig of ram :/ 

 Thank you to [@Sigalor](https://github.com/sigalor/whatsapp-web-reveng) for writing the guide to reverse engineering WhatsApp Web and thanks to [@Rhymen](https://github.com/Rhymen/go-whatsapp/) for the __go__ reimplementation.

 Baileys has also been written from the ground up to be very extensible and simple to use. 
 If you require more functionality than provided, it'll super easy for you to write an extension (More on this at the end).

* __Install__
    Create and cd to your NPM project directory and then in terminal, write: ``` npm install github:adiwajshing/Baileys ```
    Then import in your code using:
    ``` javascript 
        const WhatsAppWeb = require('Baileys') 
    ```
* __Connecting__
    ``` javascript
        const client = new WhatsAppWeb() 
        client.connect()
        .then (([user, chats, contacts, unread]) => {
            console.log ("oh hello " + user.name + " (" + user.id + ")")
            console.log ("you have " + unread.length + " unread messages")
            console.log ("you have " + chats.length + " chats")
        })
        .catch (err => console.log("unexpected error: " + err) )
    ``` 
    If the connection is successful, you will see a QR code printed on your terminal screen, scan it with WhatsApp on your phone and you'll be logged in!
* __Handling Events__
    Implement the following callbacks in your code:

    - Called when you have a pending unread message or recieve a new message
        ``` javascript 
        client.setOnUnreadMessage (m => {
            const [notificationType, messageType] = client.getNotificationType(m) // get what type of notification it is -- message, group add notification etc.
            console.log("got notification of type: " + notificationType) // message, groupAdd, groupLeave
            console.log("message type: " + messageType) // conversation, imageMessage, videoMessage etc.
        })
    - Called when you recieve an update on someone's presence, they went offline or online
        ``` javascript 
        client.setOnPresenceUpdate (json => console.log(json.id + " presence is " + json.type))
        ```
    - Called when your message gets delivered or read
        ``` javascript 
        client.setOnMessageStatusChange (json => {
            let sent = json.to
            if (json.participant) // participant exists when the message is from a group
                sent += " ("+json.participant+")" // mention as the one sent to
            // log that they acknowledged the message
            console.log(sent + " acknowledged message(s) " + json.ids + " as " + json.type + " at " + json.timestamp)
        })
        ```
    - Called when the connection gets disconnected (either the server loses internet or the phone gets unpaired)
        ``` javascript 
        client.setOnUnexpectedDisconnect (err => console.log ("disconnected unexpectedly: " + err) )
        ```
* __Sending Messages__
    It's super simple

    - Send text messages using
        ``` javascript 
        client.sendTextMessage(id, "oh hello there!") 
        ``` 
    - Send text messages & quote another message using
        ``` javascript 
            client.sendTextMessage(id, "oh hello there", quotedMessage) 
        ``` 
        ``` quotedMessage ``` is a message object
    - Send a media (image, video, sticker, pdf) message using
        ``` javascript
            const buffer = fs.readFileSync("example/ma_gif.mp4") // load some gif
            const info = {gif: true, caption: "hello!"} // some metadata & caption
            client.sendMediaMessage(id, buffer, WhatsAppWeb.MessageType.video, info)
        ```
        - The thumbnail can be generated automatically for images & stickers. Though, to automatically generate thumbnails for videos, you need to have ``` ffmpeg ``` installed on your system
        - ```mediaBuffer``` is just a Buffer containing the contents of the media you want to send
        - ```mediaType``` represents the type of message you are sending. This can be one of the following:
            ``` javascript
                [
                    WhatsAppWeb.MessageType.image, // an image message
                    WhatsAppWeb.MessageType.video, // a video message
                    WhatsAppWeb.MessageType.audio, // an audio message
                    WhatsAppWeb.MessageType.sticker // a sticker message
                ]
            ```
        - ```info``` is a JSON object, providing some information about the media. It can have the following __optional__ values:
            ``` javascript
                info = {
                    caption: "hello there!", // the caption to send with the media (cannot be sent with stickers though)
                    thumbnail: null, /* has to be a base 64 encoded JPEG if you want to send a custom thumb, 
                                        or set to null if you don't want to send a thumbnail.
                                        Do not enter this field if you want to automatically generate a thumb
                                    */
                    mimetype: "application/pdf", /* specify the type of media (optional for all media types except documents),
                                                    for pdf files => set to "application/pdf",
                                                    for txt files => set to "application/txt"
                                                    etc.
                                                */
                    gif: true // only applicable to video messages, if the video should be treated as a GIF
                }
            ```
        - Tested formats: png, jpeg, webp (sticker), mp4, ogg
    ``` id ``` is the WhatsApp id of the person or group you're sending the message to. 
    It must be in the format ```[country code][phone number]@s.whatsapp.net```, for example ```+19999999999@s.whatsapp.net``` for people. For groups, it must be in the format ``` 123456789-123345@g.us ```.
* __Sending Read Receipts__
    ``` javascript 
        client.sendReadReceipt(id, messageID) 
    ```
    The id is in the same format as mentioned earlier. The message ID is the unique identifier of the message that you are marking as read. On a message object, it can be accessed using ```messageID = message.key.id```.
* __Update Presence__
    ``` javascript
        client.updatePresence(id, WhatsAppWeb.Presence.available) 
    ```
    This lets the person/group with ``` id ``` know whether you're online, offline, typing etc. where ``` presence ``` can be one of the following:
    ``` javascript
        [
            WhatsAppWeb.Presence.available, // online
            WhatsAppWeb.Presence.unavailable, // offline
            WhatsAppWeb.Presence.composing, // typing...
            WhatsAppWeb.Presence.recording // recording...
        ]
    ```
* __Decoding Media__
    If you want to save & process some images, videos, documents or stickers you received
    ``` javascript
        client.setOnUnreadMessage (m => {
            const messageType = client.getMessageType(m.message) // get what type of message it is -- text, image, video
            // if the message is not a text message
            if (messageType !== WhatsAppWeb.MessageType.text && messageType !== WhatsAppWeb.MessageType.extendedText) {
                client.decodeMediaMessage(m.message, "filename") // extension applied automatically
                .then (meta => console.log(m.key.remoteJid + " sent media, saved at: " + meta.filename))
                .catch (err => console.log("error in decoding message: " + err))
            }
        }
    ```
* __Restoring Sessions__
    Once you connect successfully, you can get your authentication credentials using
     ``` javascript
        const authJSON = client.base64EncodedAuthInfo() 
    ```
    Then you can use this JSON to log back in without needing to scan a QR code using
    ``` javascript
        const authJSON = JSON.parse( fs.readFileSync("auth_info.json") )
        client.connect (authJSON)
        .then (([user, chats, contacts, unread]) => console.log ("yay connected"))
    ```
* __Querying__
    - To check if a given ID is on WhatsApp
        ``` javascript
            client.isOnWhatsApp ("xyz@c.us")
            .then (([exists, id]) => console.log(id + (exists ? " exists " : " does not exist") + "on WhatsApp"))
        ```
    - To query chat history on a group or with someone
        ``` javascript
        client.loadConversation ("xyz-abc@g.us", 25) // query the last 25 messages (replace 25 with the number of messages you want to query)
        .then (messages => console.log("got back " + messages.length + " messages"))
        ```
        You can also load the entire conversation history if you want
        ``` javascript
        client.loadEntireConversation ("xyz@c.us", (message) => console.log("Loaded message with ID: " + message.key.id))
        .then (() => console.log("queried all messages")) // promise resolves once all messages are retreived
        ```
    - To get the status of some person/group
        ``` javascript
        client.getStatus ("xyz@c.us") // leave empty to get your own
        .then (json => console.log("status: " + json.status))
        ```
    - To get the display picture of some person/group
        ``` javascript
        client.getStatus ("xyz@g.us") // leave empty to get your own
        .then (json => console.log("download profile picture from: " + json.eurl))
        ```
    - To get someone's presence (if they're typing, online)
        ``` javascript
        client.requestPresenceUpdate ("xyz@c.us")
        // the presence update is fetched and called here
        client.setOnPresenceUpdate (json => console.log(json.id + " presence is " + json.type))
        ```
    
    Of course, replace ``` xyz ``` with an actual ID. Also, append ``` @c.us ``` for individuals & ``` @g.us ``` for groups.
* __Groups__
    - To create a group
        ``` javascript
        client.groupCreate ("My Fab Group", ["abcd@s.whatsapp.net", "efgh@s.whatsapp.net"]) // title & participants
        .then (([json, _]) => {
            console.log ("created group with id: " + json.gid)
            client.sendTextMessage(json.gid, "hello everyone") // say hello to everyone on the group
        })
        ```
    - To add people to a group
        ``` javascript
        client.groupAdd ("abcd-xyz@g.us", ["abcd@s.whatsapp.net", "efgh@s.whatsapp.net"]) // id & people to add to the group
        .then (([json, _]) => console.log("added successfully: " + (json.status===200)))
        ```
    - To make someone admin on a group
        ``` javascript
        client.groupMakeAdmin ("abcd-xyz@g.us", ["abcd@s.whatsapp.net", "efgh@s.whatsapp.net"]) // id & people to make admin
        .then (([json, _]) => console.log("made admin successfully: " + (json.status===200)))
        ```
    - To leave a group
        ``` javascript
        client.groupLeave ("abcd-xyz@g.us")
        .then (([json, _]) => console.log("left group successfully: " + (json.status===200)))
        ```
    - To get the invite code for a group
        ``` javascript
        client.groupInviteCode ("abcd-xyz@g.us")
        .then (code => console.log(code))
        ```
* __Writing Custom Functionality__
    Baileys is also written, keeping in mind, that you may require other functionality. Hence, instead of having to fork the project & re-write the internals, you can simply write extensions in your own code.

    First, enable the logging of unhandled messages from WhatsApp by setting
    ``` javascript
    client.logUnhandledMessages = true
    ```
    This will enable you to see all sorts of messages WhatsApp sends in the console. Some examples:

    1. Functionality to track of the battery percentage of your phone.
        You enable logging and you'll see a message about your battery pop up in the console: 
        ``` [Baileys] [Unhandled] s22, ["action",null,[["battery",{"live":"false","value":"52"},null]]] ``` 
        
        You now know what a battery update looks like. It'll have the following characteristics.
        - Given ```const bMessage = ["action",null,[["battery",{"live":"false","value":"52"},null]]]```
        - ```bMessage[0]``` is always ``` "action" ```
        - ```bMessage[1]``` is always ``` null ```
        - ```bMessage[2][0][0]``` is always ``` "battery" ```

        Hence, you can register a callback for an event using the following:
        ``` javascript
        client.registerCallback (["action", null, "battery"], json => {
            const batteryLevelStr = json[2][0][1].value
            const batterylevel = parseInt (batteryLevelStr)
            console.log ("battery level: " + batterylevel + "%")
        })
        ```
        This callback will be fired any time a message is received matching the following criteria:
        ``` message [0] === "action" && message [1] === null && message[2][0][0] === "battery" ```
    2. Functionality to keep track of the pushname changes on your phone.
        You enable logging and you'll see an unhandled message about your pushanme pop up like this: 
        ```[Baileys] [Unhandled] s24, ["Conn",{"pushname":"adiwajshing"}]``` 
        
        You now know what a pushname update looks like. It'll have the following characteristics.
        - Given ```const pMessage = ["Conn",{"pushname":"adiwajshing"}] ```
        - ```pMessage[0]``` is always ``` "Conn" ```
        - ```pMessage[1]``` always has the key ``` "pushname" ```
        - ```pMessage[2]``` is always ``` undefined ```

        Following this, one can implement the following callback:
        ``` javascript
        client.registerCallback (["Conn", "pushname"], json => {
            const pushname = json[1].pushname
            client.userMetaData.name = pushname // update on client too
            console.log ("Name updated: " + pushname)
        })
        ```
        This callback will be fired any time a message is received matching the following criteria:
        ``` message [0] === "Conn" && message [1].pushname ```
    
    A little more testing will reveal that almost all WhatsApp messages are in the format illustrated above. 
    Note: except for the first parameter (in the above cases, ```"action"``` or ```"Conn"```), all the other parameters are optional.

* __Example__
    Do check out & run [example.js](example/example.js) to see example usage of these functions.
    To run the example script, download or clone the repo and then type the following in terminal:
    1. ``` cd path/to/Baileys/example ```
    2. ``` node example.js ```

# Note
 I am in no way affiliated with WhatsApp. This was written for educational purposes. Use at your own discretion.