psid-to-fbid

Mapping PSID to FBID

This package allows you to match page-specific id (psid) with user's real id (id starts with 1000...) from webhook events.

Requirement: You must have admin or editor role on that page.

Getting started

This package uses Android or iOS access_token. You can generate one by using this code:

const PsidToFbid = require('psid-to-fbid');
const email = "[e-mail]";
const password = "this_is_my_facebook_password"
console.log(PsidToFbid.genLoginURLiOS(email, password));

The code will print out an URL. You must access this URL using a browser, on client side, in order to prevent being locked down your facebook account.

The code will return some JSON stuffs. Just find the pattern starts with EAAA.... That's your access_token.

This action should be done every time you change your password, since facebook will invalidate all your access_tokens.

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How to use

npm install psid-to-fbid --save

For example you have a page with id = 182794865548469, and your Android token is EAAAAUaZA8jlABAIv...

Firstly, you must setup the package like this:

const PsidToFbid = require('psid-to-fbid');
const psidToFbid = new PsidToFbid("182794865548469")
psidToFbid.fetchPageToken("EAAAAUaZA8jlABAIv...")
    .then((page_token) => {
        console.log("Setup complete", page_token);
    }).catch(() => {
        console.log("Setup failed");
    })

After that, you can use these functions:

• getFromWebhookEvent(messaging_event)
• getFromMid(mid, psid)

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getFromWebhookEvent(messaging_event)

Get fbid from messaging_event of webhook

This does NOT work with postback from buttons / Get Started button (but works with quick replies)

Arguments

• @param {Object} messaging_event messaging_event from webhook.
• @returns {Promise} Returns Promise resolve(fbid), with fbid = null if there's an error.

Example

app.post('/webhook/', function (req, res) {
    let messaging_events = req.body.entry[0].messaging;
    for (let i = 0; i < messaging_events.length; i++) {
        let event = req.body.entry[0].messaging[i];
        let psid = event.sender.id;
        psidToFbid.getFromWebhookEvent(event).then(fbid => {
            console.log("Got psid = "+psid+", fbid = "+fbid);
        })
    }
    res.sendStatus(200);
})

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getFromMid(mid, psid)

Get fbid from mid (message_id)

For example, each time you send a message via /me/messages endpoint, you receive an object which contains message_id. The message_id can then be passed into getFromMid to get fbid of the receiver.

Arguments

• @param {String} mid message_id.
• @param {String} psid Optional, user's psid. Used for cache feature.
• @returns {Promise} Returns Promise resolve(fbid), with fbid = null if there's an error.

Example

request({
    url: 'https://graph.facebook.com/v2.6/me/messages',
    qs: {access_token:token},
    method: 'POST',
    json: {
        recipient: {id:psid},
        message: messageData,
    }
}, function(error, response, body) {
    if (!error && !response.body.error && response.body.message_id) {
        var mid = response.body.message_id;
        psidToFbid.getFromMid(mid, psid).then(fbid => {
            console.log("Got psid = "+psid+", fbid = "+fbid);
        })
    }
})

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Author

• ngxson (Nui Nguyen)
• Email: contact at ngxson dot com
• My website: https://ngxson.com