NativeScript/http/http.ts

import image = require("image-source");
import httpRequest = require("http/http-request");
import dts = require("http");

global.moduleMerge(httpRequest, exports);

export function getString(arg: any): Promise<string> {
    return new Promise<string>((resolve, reject) => {
        httpRequest.request(typeof arg === "string" ? { url: arg, method: "GET" } : arg)
            .then(r => {
            try {
                var str = r.content.toString();
                resolve(str);
            } catch (e) {
                reject(e);
            }
        }, e => reject(e));
    });
}

export function getJSON<T>(arg: any): Promise<T> {
    return new Promise<T>((resolve, reject) => {
        httpRequest.request(typeof arg === "string" ? { url: arg, method: "GET" } : arg)
            .then(r => {
            try {
                var json = r.content.toJSON();
                resolve(json);
            } catch (e) {
                reject(e);
            }
        }, e => reject(e));
    });
}

export function getImage(arg: any): Promise<image.ImageSource> {
    return new Promise<image.ImageSource>((resolve, reject) => {
        httpRequest.request(typeof arg === "string" ? { url: arg, method: "GET" } : arg)
            .then(r => {
            r.content.toImage().then(source => resolve(source), e => reject(e));
        }, e => reject(e));
    });
}

export function getFile(arg: any, destinationFilePath?: string): Promise<any> {
    return new Promise<any>((resolve, reject) => {
        httpRequest.request(typeof arg === "string" ? { url: arg, method: "GET" } : arg)
            .then(r => {
                try {
                    var file = r.content.toFile(destinationFilePath);
                    resolve(file);
                } catch (e) {
                    reject(e);
                }
            }, e => reject(e));
    });
}

export function addHeader(headers: dts.Headers, key: string, value: string): void{
    if(!headers[key]) {
        headers[key] = value;
    } else if (Array.isArray(headers[key])){
        (<string[]>headers[key]).push(value);
    } else {
        let values: string[] = [<string>headers[key]];
        values.push(value);
        headers[key] = values;
    }
}