request.js/index.js

393 lines
11 KiB
JavaScript

'use strict';
var http = require('http');
var https = require('https');
var url = require('url');
function debug() {
if (module.exports.debug) {
console.log.apply(console, arguments);
}
}
function mergeOrDelete(defaults, updates) {
Object.keys(defaults).forEach(function (key) {
if (!(key in updates)) {
updates[key] = defaults[key];
return;
}
// neither accept the prior default nor define an explicit value
// CRDT probs...
if ('undefined' === typeof updates[key]) {
delete updates[key];
} else if ('object' === typeof defaults[key] && 'object' === typeof updates[key]) {
updates[key] = mergeOrDelete(defaults[key], updates[key]);
}
});
return updates;
}
function hasHeader(reqOpts, header) {
var headers = {};
Object.keys(reqOpts.headers).forEach(function (key) {
headers[key.toLowerCase()] = true;
});
return headers[header.toLowerCase()];
}
function toJSONifier(keys) {
return function () {
var obj = {};
var me = this;
keys.forEach(function (key) {
if (me[key] && 'function' === typeof me[key].toJSON) {
obj[key] = me[key].toJSON();
} else {
obj[key] = me[key];
}
});
return obj;
};
}
function setDefaults(defs) {
defs = defs || {};
function urequestHelper(opts, cb) {
debug("\n[urequest] processed options:");
debug(opts);
function onResponse(resp) {
var followRedirect;
Object.keys(defs).forEach(function (key) {
if (key in opts && 'undefined' !== typeof opts[key]) {
return;
}
opts[key] = defs[key];
});
followRedirect = opts.followRedirect;
resp.toJSON = toJSONifier([ 'statusCode', 'body', 'headers', 'request' ]);
resp.request = req;
resp.request.uri = url.parse(opts.url);
//resp.request.method = opts.method;
resp.request.headers = opts.headers;
resp.request.toJSON = toJSONifier([ 'uri', 'method', 'headers' ]);
if (followRedirect && resp.headers.location && -1 !== [ 301, 302 ].indexOf(resp.statusCode)) {
debug('Following redirect: ' + resp.headers.location);
if ('GET' !== opts.method && !opts.followAllRedirects) {
followRedirect = false;
}
if (opts._redirectCount >= opts.maxRedirects) {
followRedirect = false;
}
if ('function' === opts.followRedirect) {
if (!opts.followRedirect(resp)) {
followRedirect = false;
}
}
if (followRedirect) {
if (!opts.followOriginalHttpMethod) {
opts.method = 'GET';
opts.body = null;
}
if (opts.removeRefererHeader && opts.headers) {
delete opts.headers.referer;
}
// TODO needs baseUrl, maybe test for host / socketPath?
opts.url = resp.headers.location;
opts.uri = url.parse(opts.url);
return urequestHelper(opts, cb);
}
}
if (null === opts.encoding) {
resp._body = [];
} else {
resp.body = '';
}
resp._bodyLength = 0;
resp.on('data', function (chunk) {
if ('string' === typeof resp.body) {
resp.body += chunk.toString(opts.encoding);
} else {
resp._body.push(chunk);
resp._bodyLength += chunk.length;
}
});
resp.on('end', function () {
if ('string' !== typeof resp.body) {
if (1 === resp._body.length) {
resp.body = resp._body[0];
} else {
resp.body = Buffer.concat(resp._body, resp._bodyLength);
}
resp._body = null;
}
if (opts.json && 'string' === typeof resp.body) {
// TODO I would parse based on Content-Type
// but request.js doesn't do that.
try {
resp.body = JSON.parse(resp.body);
} catch(e) {
// ignore
}
}
debug("\n[urequest] resp.toJSON():");
debug(resp.toJSON());
cb(null, resp, resp.body);
});
}
var req;
var finalOpts = {};
var _body;
var MyFormData;
var form;
var formHeaders;
var requester;
if (opts.body) {
if (true === opts.json) {
_body = JSON.stringify(opts.body);
} else {
_body = opts.body;
}
} else if (opts.json && true !== opts.json) {
_body = JSON.stringify(opts.json);
} else if (opts.form) {
_body = Object.keys(opts.form).filter(function (key) {
if ('undefined' !== typeof opts.form[key]) {
return true;
}
}).map(function (key) {
return encodeURIComponent(key) + '=' + encodeURIComponent(String(opts.form[key]));
}).join('&');
opts.headers['Content-Type'] = 'application/x-www-form-urlencoded';
}
if ('string' === typeof _body) {
_body = Buffer.from(_body);
}
Object.keys(opts.uri).forEach(function (key) {
finalOpts[key] = opts.uri[key];
});
finalOpts.method = opts.method;
finalOpts.headers = opts.headers;
if (_body) {
// Most APIs expect (or require) Content-Length except in the case of multipart uploads
// Transfer-Encoding: Chunked (the default) is generally only well-supported downstream
finalOpts.headers['Content-Length'] = _body.byteLength || _body.length;
}
if (opts.formData) {
try {
MyFormData = opts.FormData || require('form-data');
// potential options https://github.com/felixge/node-combined-stream/blob/master/lib/combined_stream.js#L7-L15
} catch(e) {
console.error("urequest does not include extra dependencies by default");
console.error("if you need to use 'form-data' you may install it, like so:");
console.error(" npm install --save form-data");
cb(e);
return;
}
try {
form = new MyFormData();
Object.keys(opts.formData).forEach(function (key) {
function add(key, data, opts) {
if (data.value) { opts = data.options; data = data.value; }
form.append(key, data, opts);
}
if (Array.isArray(opts.formData[key])) {
opts.formData[key].forEach(function (data) {
add(key, data);
});
} else {
add(key, opts.formData[key]);
}
});
} catch(e) {
cb(e);
return;
}
formHeaders = form.getHeaders();
Object.keys(formHeaders).forEach(function (header) {
finalOpts.headers[header] = formHeaders[header];
});
}
// TODO support unix sockets
if ('https:' === finalOpts.protocol) {
// https://nodejs.org/api/https.html#https_https_request_options_callback
debug("\n[urequest] https.request(opts):");
debug(finalOpts);
requester = https;
} else if ('http:' === finalOpts.protocol) {
// https://nodejs.org/api/http.html#http_http_request_options_callback
debug("\n[urequest] http.request(opts):");
debug(finalOpts);
requester = http;
} else {
cb(new Error("unknown protocol: '" + opts.uri.protocol + "'"));
return;
}
if (form) {
debug("\n[urequest] '" + finalOpts.method + "' (request) form");
debug(formHeaders);
// generally uploads don't use Chunked Encoding (some systems have issues with it)
// and I don't want to do the work to calculate the content-lengths. This seems to work.
form.submit(finalOpts, onResponse);
//req = requester.request(finalOpts, onResponse);
//req.on('error', cb);
//form.pipe(req);
return;
}
req = requester.request(finalOpts, onResponse);
req.on('error', cb);
if (_body) {
debug("\n[urequest] '" + finalOpts.method + "' (request) body");
debug(_body);
// used for chunked encoding
//req.write(_body);
// used for known content-length
req.end(_body);
} else {
req.end();
}
}
function parseUrl(str) {
var obj = url.parse(str);
var paths;
if ('unix' !== (obj.hostname||obj.host||'').toLowerCase()) {
return obj;
}
obj.href = null;
obj.hostname = obj.host = null;
paths = (obj.pathname||obj.path||'').split(':');
obj.socketPath = paths.shift();
obj.pathname = obj.path = paths.join(':');
return obj;
}
function urequest(opts, cb) {
debug("\n[urequest] received options:");
debug(opts);
var reqOpts = {};
// request.js behavior:
// encoding: null + json ? unknown
// json => attempt to parse, fail silently
// encoding => buffer.toString(encoding)
// null === encoding => Buffer.concat(buffers)
if ('string' === typeof opts) {
opts = { url: opts };
}
module.exports._keys.forEach(function (key) {
if (key in opts && 'undefined' !== typeof opts[key]) {
reqOpts[key] = opts[key];
} else if (key in defs) {
reqOpts[key] = defs[key];
}
});
// TODO url.resolve(defs.baseUrl, opts.url);
if ('string' === typeof opts.url || 'string' === typeof opts.uri) {
if ('string' === typeof opts.url) {
reqOpts.url = opts.url;
reqOpts.uri = parseUrl(opts.url);
} else if ('string' === typeof opts.uri) {
reqOpts.url = opts.uri;
reqOpts.uri = parseUrl(opts.uri);
}
} else {
if ('object' === typeof opts.uri) {
reqOpts.url = url.format(opts.uri);
reqOpts.uri = opts.uri;
//reqOpts.uri = url.parse(reqOpts.uri);
} else if ('object' === typeof opts.url) {
reqOpts.url = url.format(opts.url);
reqOpts.uri = opts.url;
//reqOpts.uri = url.parse(reqOpts.url);
}
}
if (opts.body || opts.json || opts.form || opts.formData) {
reqOpts.method = (reqOpts.method || 'POST').toUpperCase();
} else {
reqOpts.method = (reqOpts.method || 'GET').toUpperCase();
}
reqOpts.headers = reqOpts.headers || {};
// crazy case for easier testing
if (!hasHeader(reqOpts, 'CoNTeNT-TyPe')) {
if ((true === reqOpts.json && reqOpts.body)
|| (true !== reqOpts.json && reqOpts.json)) {
reqOpts.headers['Content-Type'] = 'application/json';
}
}
return urequestHelper(reqOpts, cb);
}
urequest.defaults = function (_defs) {
_defs = mergeOrDelete(defs, _defs);
return setDefaults(_defs);
};
[ 'get', 'put', 'post', 'patch', 'delete', 'head', 'options' ].forEach(function (method) {
urequest[method] = function (obj) {
if ('string' === typeof obj) {
obj = { url: obj };
}
obj.method = method.toUpperCase();
urequest(obj);
};
});
urequest.del = urequest.delete;
return urequest;
}
var _defaults = {
sendImmediately: true
, method: 'GET'
, headers: {}
, useQuerystring: false
, followRedirect: true
, followAllRedirects: false
, followOriginalHttpMethod: false
, maxRedirects: 10
, removeRefererHeader: false
//, encoding: undefined
, gzip: false
//, body: undefined
//, json: undefined
};
module.exports = setDefaults(_defaults);
module.exports._keys = Object.keys(_defaults).concat([
'encoding'
, 'body'
, 'json'
, 'form'
, 'formData'
, 'FormData'
]);
module.exports.debug = (-1 !== (process.env.NODE_DEBUG||'').split(/\s+/g).indexOf('urequest'));
debug("DEBUG ON for urequest");