enhancer-data-bridge/controllers/httpproxy.js

A bridge between Enhancer Clould and user business datasource

var logger = require('log4js').getLogger('io');
var request = require('request');

var pattern = {
    variableAndIdentifier: /(@(\d+-)?\w+(\.\w+)*@)|(\$(\d+-)?\w+(\.\w+)*\$)/g,
    variable: /@(\d+-)?\w+(\.\w+)*@/g,
    clientVariable: /(@\d+-\w+(\.\w+)*@)|(\$\d+-\w+(\.\w+)*\$)/g,
    identifier:  /\$(\d+-)?\w+(\.\w+)*\$/g
};

module.exports = {
    request: function(req, res, next) {
        // mock server vars for user debug
        var serverVars = req.body.serverVars;
        try {
            serverVars = JSON.parse(decodeURIComponent(serverVars));
        } catch(e) {
            serverVars = {};
        }

        var criteria;
        try {
            criteria = JSON.parse(req.body.criteria);
        } catch (e) {
            return res.end('Invalid criteria');
        }

        // merge
        var params = criteria.params || {};

        for (var i in serverVars) {
            params[i.toUpperCase()] = serverVars[i];
        }

        var options = JSON.parse(req.body.httpOptions);
        
        if (!options.url) {
            return res.end('Invalid http proxy url');
        }
        options.url = options.url.replace(pattern.variableAndIdentifier, function(s) {
            var name = s.split(/\@|\$/)[1].toUpperCase();
            var val = params[name];
            if (typeof val === 'object') {
                return encodeURIComponent(JSON.stringify(val));
            }
            return encodeURIComponent(val);
        });
        
        options.bodyContent = options.bodyContent.replace(pattern.variableAndIdentifier, function(s) {
            var name = s.split(/\@|\$/)[1].toUpperCase();
            return options.contentType === 'application/json'
                ? JSON.stringify(params[name])
                : encodeURIComponent(params[name]);
        });

        request({
            url: options.url,
            method: options.requestMethod,
            headers: {
                'Cookie': options.mockCookie,
                'Content-Type': options.contentType
            },
            body: options.bodyContent,
            timeout: 3000,
            callback: function(err, res0) {
                if (err) {
                    return res.jsonp({
                        success: false,
                        message: err.message
                    });
                }
                res.jsonp({
                    success: true,
                    data: res0.body
                });
            }
        });

    }
};