context.js

var path = require("path");
var fs = require("fs");
var footprint = require("footprint");

var Context = function (request, response, session, framework) {
    this.request = request;
    this.response = response;
    this.session = session;
    this.framework = framework;
};
Context.prototype.none = function () {
    this.response.writeHead(204);
    this.response.end();
};
Context.prototype.renderJSON = function (jsonObj) {
    this.response.setHeader("Content-Type", "application/json");
    this.response.writeHead(200);
    this.response.end(JSON.stringify(jsonObj));
};
Context.prototype.redirect = function (url) {
    this.response.setHeader("Location", url);
    this.response.writeHead(301);
    this.response.end();
};
Context.prototype._renderView = function (viewEngine, template, data) {
    var framework = this.framework,
        request = this.request,
        response = this.response;

    try {
        response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
        response.write(viewEngine.template(template, data));
        response.end();
    } catch (ex) {
        console.log(ex.message);
        console.log(ex.stack);
        framework.handler500(request, response, "Parse template error.");
    }
};

Context.prototype.renderView = function (view, data) {
    var context = this,
        framework = context.framework,
        request = context.request,
        response = context.response;

    // Get engine.
    var viewEngine = footprint;

    // Check cache.
    viewEngine._cache = viewEngine._cache || {};
    var template = viewEngine._cache[view];
    if (template) {
        context._renderView(viewEngine, template, data);
    } else {
        var filePath = path.join(__dirname, "views/", view);

        path.exists(filePath, function (exists) {
            if(!exists) {
                framework.handler500(request, response, "This template file doesn't exist.");  
            } else {
                fs.readFile(filePath, "utf8", function(err, file) {  
                    if (err) {
                        framework.handler500(request, response, err);
                    } else {
                        viewEngine._cache[view] = file;
                        context._renderView(viewEngine, file, data);
                    }
                });
            }
        });
    }
};
Context.prototype.renderPartial = Context.prototype.renderView;

exports.Context = Context;