Search & paginate flicker photos for a given search filters and returns the collection of photos urls

flickerphotos.js

var Client = require('node-rest-client').Client;
var _ = require("underscore");
var json2xls = require('json2xls');
var fs = require('fs');


//API Explorer : https://www.flickr.com/services/api/explore/flickr.photos.search
var flickr_api_endpoint = "https://api.flickr.com/services/rest/?method=flickr.photos.search&format=json&nojsoncallback=1";
var flickerPhotos = [];

exports.handler = function (request, context) {   
    
    //1) Resolve input and execute REST calls
    try {
        var flickr_api_key = request.api_key;
        var flickr_search_tags = request.search_tags;
        var flickr_search_text = request.search_text;
        var flickr_search_limit = request.search_limit;
        var flickr_search_currentpage = request.search_currentpage;
        flickr_api_endpoint = flickr_api_endpoint + "&api_key=" + flickr_api_key + "&tags=" + flickr_search_tags + "&text=" + flickr_search_text + "&per_page=" + flickr_search_limit + "&page=" + flickr_search_currentpage
        console.log(flickr_api_endpoint);
        var client = new Client();
        
        client.registerMethod("flickrSearch", flickr_api_endpoint, "GET");
    }
    catch (e) {
        context.fail("Something wrong in the input! please check. [" + e.message + "]");
    }
    //2) Process REST call response and send it back to the client.
    var args = { headers: { "Content-Type": "application/json", "Cache-Control": "no-cache" } };
    client.methods.flickrSearch(args,function (res, rawdata) {

        try {
            console.log("Length = [" + res.photos.photo.length + "]");
            _.each(res.photos.photo, function (item, index, list) {
                //console.log("http://farm" + item.farm + ".staticflickr.com/" + item.server + "/" + item.id + "_" + item.secret + "_b.jpg");
                flickerPhotos[index] = "http://farm" + item.farm + ".staticflickr.com/" + item.server + "/" + item.id + "_" + item.secret + "_b.jpg";
            });
            context.succeed(flickerPhotos);
        }
        catch (e) {
            context.fail(e.message);
        }       
    }
)
};