Ghost/core/server/lib/image/gravatar.js

const Promise = require('bluebird');
const crypto = require('crypto');

class Gravatar {
    constructor({config, request}) {
        this.config = config;
        this.request = request;
    }

    lookup(userData, timeout) {
        let gravatarUrl = '//www.gravatar.com/avatar/' +
            crypto.createHash('md5').update(userData.email.toLowerCase().trim()).digest('hex') +
            '?s=250';
    
        if (this.config.isPrivacyDisabled('useGravatar')) {
            return Promise.resolve();
        }
    
        return Promise.resolve(this.request('https:' + gravatarUrl + '&d=404&r=x', {timeout: timeout || 2 * 1000}))
            .then(function () {
                gravatarUrl += '&d=mm&r=x';
    
                return {
                    image: gravatarUrl
                };
            })
            .catch({statusCode: 404}, function () {
                return {
                    image: undefined
                };
            })
            .catch(function () {
                // ignore error, just resolve with no image url
            });
    }
}

module.exports = Gravatar;