instagram.js

var express = require('express');
var request = require("request");
var jsdom = require("jsdom");
var router = express.Router();

/* POST /instagram/userID. */
router.post('/userID', function (req, res) {
    var userName = req.body.userName;
    if (typeof userName === 'undefined') {
        res.status(400);
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.send(JSON.stringify({
            meta: {
                code: 400,
                reason: 'Username not provided'
            }
        }));
        res.end();
    } else {
        dbcs.instagramUserID.findOne({name: userName}, function (err, user) {
            if (user) {
                res.status(200);
                res.setHeader('Access-Control-Allow-Origin', '*');
                res.send(JSON.stringify({
                    meta: {
                        code: 200
                    }, data: {
                        userID: user.id,
                        userName: userName
                    }
                }));
                res.end();
            } else
                request('http://instagram.com/' + userName, function (error, response, body) {
                    if (typeof body === 'undefined') {
                        res.status(500);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 500,
                                reason: 'Could not connect to instagram. Try again later.'
                            }
                        }));
                        res.end();
                        return;
                    }
                    jsdom.env(
                        body,
                        ['http://instagram.com'],
                        function (err, window) {
                            var elements = window.document.querySelectorAll('html body script');

                            eval(elements[2].innerHTML);

                            //noinspection JSUnresolvedVariable
                            if (typeof window._sharedData === 'undefined' || typeof window._sharedData.entry_data === 'undefined') {
                                res.status(400);
                                res.setHeader('Access-Control-Allow-Origin', '*');
                                res.send(JSON.stringify({
                                    meta: {
                                        code: 400,
                                        reason: 'User not found'
                                    }
                                }));
                                res.end();
                            } else {
                                //noinspection JSUnresolvedVariable
                                var userID = window._sharedData.entry_data.ProfilePage[0].user.id;
                                res.status(200);
                                res.setHeader('Access-Control-Allow-Origin', '*');
                                res.send(JSON.stringify({
                                    meta: {
                                        code: 200
                                    }, data: {
                                        userID: userID,
                                        userName: userName
                                    }
                                }));
                                res.end();
                                dbcs.instagramUserID.insert({
                                    name: userName,
                                    id: userID
                                });
                            }
                        });
                });
            //});

        });
    }
});


/* POST /instagram/mediaID. */
router.post('/mediaID', function (req, res) {
    var publicID = req.body.publicID;
    if (typeof publicID === 'undefined') {
        res.status(400);
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.send(JSON.stringify({
            meta: {
                code: 400,
                reason: 'Media ID not provided'
            }
        }));
        res.end();
    } else {
        dbcs.instagramMediaID.findOne({publicId: publicID}, function (err, media) {
            if (media) {
                res.status(200);
                res.setHeader('Access-Control-Allow-Origin', '*');
                res.send(JSON.stringify({
                    meta: {
                        code: 200
                    }, data: {
                        mediaID: media.mediaID,
                        userName: media.authorName
                    }
                }));
                res.end();
            } else {
                request('https://api.instagram.com/oembed?url=http://instagram.com/p/' + publicID, function (error, response, body) {
                    if (typeof body === 'undefined') {
                        res.status(500);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 500,
                                reason: 'Could not connect to instagram. Try again later.'
                            }
                        }));
                        res.end();
                        return;
                    }

                    if (body === 'No Media Match') {
                        res.status(400);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 400,
                                reason: 'Media Not Found'
                            }
                        }));
                        res.end();
                    } else {
                        var json = JSON.parse(body);
                        res.status(200);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 200
                            }, data: {
                                mediaID: json.media_id,
                                userName: json.author_name
                            }
                        }));
                        res.end();
                        dbcs.instagramMediaID.insert({
                            publicId: publicID,
                            mediaID: json.media_id,
                            authorName: json.author_name
                        });
                    }
                });
            }
        });
    }
});


/* POST /instagram/postDetails. */
router.post('/postDetails', function (req, res) {
    var publicID = req.body.publicID;
    if (typeof publicID === 'undefined') {
        res.status(400);
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.send(JSON.stringify({
            meta: {
                code: 400,
                reason: 'Media ID not provided'
            }
        }));
        res.end();
    } else {
        dbcs.instagramPostDetails.findOne({publicID: publicID}, function (err, media) {
            if (media) {
                res.status(200);
                res.setHeader('Access-Control-Allow-Origin', '*');
                res.send(JSON.stringify({
                    meta: {
                        code: 200
                    }, data: {
                        mediaID: media.mediaID,
                        userName: media.authorName,
                        imageLink: media.thumbnailURL,
                        height: media.height,
                        width: media.width,
                        title: media.title
                    }
                }));
                res.end();
            } else {
                request('https://api.instagram.com/oembed?url=http://instagram.com/p/' + publicID, function (error, response, body) {
                    if (typeof body === 'undefined') {
                        res.status(500);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 500,
                                reason: 'Could not connect to instagram. Try again later.'
                            }
                        }));
                        res.end();
                        return;
                    }
                    if (body === 'No Media Match') {
                        res.status(400);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        res.send(JSON.stringify({
                            meta: {
                                code: 400,
                                reason: 'Media Not Found'
                            }
                        }));
                        res.end();
                    } else {
                        var json = JSON.parse(body);
                        res.status(200);
                        res.setHeader('Access-Control-Allow-Origin', '*');
                        //noinspection JSUnresolvedVariable
                        res.send(JSON.stringify({
                            meta: {
                                code: 200
                            }, data: {
                                mediaID: json.media_id,
                                userName: json.author_name,
                                imageLink: json.thumbnail_url,
                                height: json.thumbnail_height,
                                width: json.thumbnail_width,
                                title: json.title
                            }
                        }));
                        res.end();
                        //noinspection JSUnresolvedVariable
                        dbcs.instagramPostDetails.insert({
                            publicID: publicID,
                            mediaID: json.media_id,
                            authorName: json.author_name,
                            thumbnailURL: json.thumbnail_url,
                            height: json.thumbnail_height,
                            width: json.thumbnail_width,
                            title: json.title
                        });
                    }
                });
            }
        });
    }
});

module.exports = router;