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| /*jshint esnext: true */
var request = require('request'),
_url = require('url');
/**
* Sends a HTTP request to a specified URL with optional proxy, query strings, and handlers.
* Convenient handling of request error and unexpected status code.
* GET redirection is handled by default by request module.
* Non-GET redirection is handled by params followAllRedirects: true.
*
* @param {String} method: http method
* @param {String} url: URL without query string
* @param {Object} opts: optional
* - proxy: proxy server URL with format http://user:pass@host:port
* - noProxyHosts: an array of host names which will ignore any proxy settings, defaults to: localhost, 127.0.0.1
* - queryStrings: object containing URL query strings with format { name: value }
* - handlers: response handlers with format { statuscode: function(result, cb) }
* - headers: object containing http headers, exact map to mikeal/request headers opt
* - body, form, json, multipart: request payload, exact map to mikeal/request module body, form, json, multipart opts
* - timeout: request timeout in milliseconds, default to 2000 milliseconds
* - requestOpts: mikeal/request module opts, these opts will override any params set by http#req
* @param {Function} cb: standard cb(err, result) callback
*/
function req(method, url, opts, cb) {
opts.handlers = opts.handlers || {};
const TIMEOUT = 2000;
// init default settings with follow redirections on all methods, and 2 seconds timeout
var params = { url: url, followAllRedirects: true, timeout: opts.timeout || TIMEOUT },
envProxy = proxy(url);
function _proxyIgnored() {
const NO_PROXY_HOSTS = ['localhost', '127.0.0.1'];
return (opts.noProxyHosts || NO_PROXY_HOSTS).indexOf(_url.parse(url).hostname) !== -1;
}
// set proxy setting based on environment variable
if (!_proxyIgnored()) {
if (opts.proxy) {
params.proxy = opts.proxy;
} else if (envProxy) {
params.proxy = envProxy;
}
}
// just a more readable opt name for query strings
if (opts.queryStrings) {
params.qs = opts.queryStrings;
}
// headers and payload handling
['headers', 'body', 'form', 'json', 'multipart'].forEach(function (opt) {
if (opts[opt]) {
params[opt] = opts[opt];
}
});
// override defaults with mikeal/request-specific opts
if (opts.requestOpts) {
Object.keys(opts.requestOpts).forEach(function (opt) {
params[opt] = opts.requestOpts[opt];
});
}
// check for any wildcard match (e.g. 201 matches 2xx)
function _wildcardMatch(statusCode) {
var match;
Object.keys(opts.handlers).forEach(function (handlerStatusCode) {
var regex = new RegExp(handlerStatusCode.replace(/x/g, '.'));
if (!match && statusCode.toString().match(regex)) {
match = handlerStatusCode;
}
});
return match;
}
function _requestMethod(method) {
var requestMethod = method.toLowerCase();
if (requestMethod === 'delete') {
requestMethod = 'del';
}
return requestMethod;
}
request[_requestMethod(method)](params, function (err, result) {
Iif (err) {
cb(err);
} else {
var wildcardMatch = _wildcardMatch(result.statusCode);
if (opts.handlers[result.statusCode]) {
opts.handlers[result.statusCode](result, cb);
} else Eif (wildcardMatch) {
opts.handlers[wildcardMatch](result, cb);
} else {
cb(new Error('Unexpected status code: ' + result.statusCode + '\nResponse body:\n' + result.body));
}
}
});
}
/**
* Determines proxy value based on URL and process environment variable (http_proxy, https_proxy).
* This allows library clients to control which proxy to use by setting environment variable.
* - if url starts with http, use http_proxy when available
* - if url starts with https, use https_proxy when available, otherwise fallback to http_proxy
* - if url does not have protocol, assume http protocol
* - if url is not specified, http_proxy takes precedence over https_proxy
*
* @param {String} url: URL used to determine which proxy environment variable to use
*/
function proxy(url) {
var _proxy;
if (!url) {
_proxy = process.env.http_proxy || process.env.HTTP_PROXY || process.env.https_proxy || process.env.HTTPS_PROXY;
} else {
if (!url.match(/^https?:\/\//)) {
url += 'http://' + url;
}
if (url.match(/^https:\/\//)) {
_proxy = process.env.https_proxy || process.env.HTTPS_PROXY || process.env.http_proxy || process.env.HTTP_PROXY;
} else {
_proxy = process.env.http_proxy;
}
}
return _proxy;
}
exports.request = req;
exports.proxy = proxy;
|