Implement responding to /comments request.

var MySQLStore = require('connect-mysql-session')(express);

var DbFacade = require('./db_facade');

var Comments = require('./comments');

var crypto = require('crypto');

var app = express();

    });

});

// Returns a list of comments for a particular target (eg class, guide, video)

app.get('/auth/:sdk/:version/comments', function(req, res) {

    if (!req.query.startkey) {

        res.json({error: 'Invalid request'});

        return;

    }

    function formatComment(comment) {

        return {

            author: comment.username,

            contentHtml: comment.content_html,

            createdAt: String(comment.created_at),

            score: comment.vote,

            moderator: comment.moderator,

            emailHash: crypto.createHash('md5').update(comment.email).digest("hex")

        };

    }

    var db = new DbFacade(config.mysql);

    var comments = new Comments(db, req.params.sdk+"-"+req.params.version);

    var target = JSON.parse(req.query.startkey);

    var query = {

        type: target[0],

        cls: target[1],

        member: target[2] || ""

    };

    comments.find(query, function(err, comments) {

        res.json(comments.map(formatComment));

    });

});

app.listen(config.port);

console.log("Server started at port "+config.port+"...");