mirror of
https://github.com/node-red/node-red.git
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300 lines
12 KiB
JavaScript
300 lines
12 KiB
JavaScript
/**
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* Copyright 2013,2015 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var http = require("follow-redirects").http;
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var https = require("follow-redirects").https;
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var urllib = require("url");
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var express = require("express");
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var getBody = require('raw-body');
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var mustache = require("mustache");
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var querystring = require("querystring");
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var cors = require('cors');
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var jsonParser = express.json();
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var urlencParser = express.urlencoded();
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var onHeaders = require('on-headers');
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function rawBodyParser(req, res, next) {
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if (req._body) { return next(); }
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req.body = "";
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req._body = true;
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getBody(req, {
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limit: '1mb',
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length: req.headers['content-length'],
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encoding: 'utf8'
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}, function (err, buf) {
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if (err) { return next(err); }
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req.body = buf;
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next();
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});
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}
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function HTTPIn(n) {
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RED.nodes.createNode(this,n);
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if (RED.settings.httpNodeRoot !== false) {
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this.url = n.url;
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this.method = n.method;
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var node = this;
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this.errorHandler = function(err,req,res,next) {
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node.warn(err);
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res.send(500);
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};
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this.callback = function(req,res) {
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if (node.method == "post") {
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node.send({req:req,res:res,payload:req.body});
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} else if (node.method == "get") {
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node.send({req:req,res:res,payload:req.query});
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} else {
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node.send({req:req,res:res});
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}
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};
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var corsHandler = function(req,res,next) { next(); }
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if (RED.settings.httpNodeCors) {
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corsHandler = cors(RED.settings.httpNodeCors);
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RED.httpNode.options(this.url,corsHandler);
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}
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var metricsHandler = function(req,res,next) { next(); }
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if (this.metric()) {
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metricsHandler = function(req, res, next) {
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var startAt = process.hrtime();
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onHeaders(res, function() {
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if(res._msgId) {
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var diff = process.hrtime(startAt);
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var ms = diff[0] * 1e3 + diff[1] * 1e-6;
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var metricResponseTime = ms.toFixed(3);
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var metricContentLength = res._headers["content-length"];
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//assuming that _id has been set for res._metrics in HttpOut node!
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node.metric("response.time.millis", {_id:res._msgId} , metricResponseTime);
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node.metric("response.content-length.bytes", {_id:res._msgId} , metricContentLength);
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}
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});
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next();
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};
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}
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if (this.method == "get") {
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RED.httpNode.get(this.url,corsHandler,metricsHandler,this.callback,this.errorHandler);
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} else if (this.method == "post") {
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RED.httpNode.post(this.url,corsHandler,metricsHandler,jsonParser,urlencParser,rawBodyParser,this.callback,this.errorHandler);
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} else if (this.method == "put") {
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RED.httpNode.put(this.url,corsHandler,metricsHandler,jsonParser,urlencParser,rawBodyParser,this.callback,this.errorHandler);
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} else if (this.method == "delete") {
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RED.httpNode.delete(this.url,corsHandler,metricsHandler,this.callback,this.errorHandler);
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}
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this.on("close",function() {
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var routes = RED.httpNode.routes[this.method];
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for (var i = 0; i<routes.length; i++) {
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if (routes[i].path == this.url) {
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routes.splice(i,1);
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//break;
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}
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}
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if (RED.settings.httpNodeCors) {
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var routes = RED.httpNode.routes['options'];
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if (routes) {
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for (var j = 0; j<routes.length; j++) {
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if (routes[j].path == this.url) {
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routes.splice(j,1);
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//break;
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}
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}
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}
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}
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});
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} else {
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this.warn("Cannot create http-in node when httpNodeRoot set to false");
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}
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}
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RED.nodes.registerType("http in",HTTPIn);
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function HTTPOut(n) {
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RED.nodes.createNode(this,n);
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var node = this;
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this.on("input",function(msg) {
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if (msg.res) {
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if (msg.headers) {
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msg.res.set(msg.headers);
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}
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var statusCode = msg.statusCode || 200;
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if (typeof msg.payload == "object" && !Buffer.isBuffer(msg.payload)) {
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msg.res.jsonp(statusCode,msg.payload);
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} else {
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if (msg.res.get('content-length') == null) {
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var len;
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if (msg.payload == null) {
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len = 0;
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} else if (typeof msg.payload == "number") {
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len = Buffer.byteLength(""+msg.payload);
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} else {
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len = Buffer.byteLength(msg.payload);
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}
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msg.res.set('content-length', len);
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}
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msg.res._msgId = msg._id;
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msg.res.send(statusCode,msg.payload);
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}
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} else {
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node.warn("No response object");
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}
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});
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}
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RED.nodes.registerType("http response",HTTPOut);
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function HTTPRequest(n) {
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RED.nodes.createNode(this,n);
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var nodeUrl = n.url;
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var isTemplatedUrl = (nodeUrl||"").indexOf("{{") != -1;
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var nodeMethod = n.method || "GET";
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this.ret = n.ret || "txt";
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var node = this;
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this.on("input",function(msg) {
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var preRequestTimestamp = process.hrtime();
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node.status({fill:"blue",shape:"dot",text:"requesting"});
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var url;
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if (msg.url) {
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if (n.url && (n.url !== msg.url)) {
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node.warn("Deprecated: msg properties should not override set node properties. See bit.ly/nr-override-msg-props");
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}
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url = msg.url;
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} else if (isTemplatedUrl) {
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url = mustache.render(nodeUrl,msg);
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} else {
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url = nodeUrl;
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}
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// url must start http:// or https:// so assume http:// if not set
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if (!((url.indexOf("http://")===0) || (url.indexOf("https://")===0))) {
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url = "http://"+url;
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}
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var method;
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if (msg.method) { // if method set in msg
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if (n.method && (n.method !== "use")) { // warn if override option not set
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node.warn("Deprecated: msg properties should not override fixed node properties. Use explicit override option. See bit.ly/nr-override-msg-props");
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}
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method = msg.method.toUpperCase(); // but use it anyway
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} else {
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if (n.method !== "use") {
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method = nodeMethod.toUpperCase(); // otherwise use the selected method
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} else { // unless they selected override
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method = "GET"; // - in which case default to GET
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}
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}
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var opts = urllib.parse(url);
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opts.method = method;
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opts.headers = {};
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if (msg.headers) {
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for (var v in msg.headers) {
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if (msg.headers.hasOwnProperty(v)) {
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var name = v.toLowerCase();
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if (name !== "content-type" && name !== "content-length") {
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// only normalise the known headers used later in this
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// function. Otherwise leave them alone.
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name = v;
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}
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opts.headers[name] = msg.headers[v];
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}
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}
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}
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if (this.credentials && this.credentials.user) {
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opts.auth = this.credentials.user+":"+(this.credentials.password||"");
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}
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var payload = null;
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if (msg.payload && (method == "POST" || method == "PUT" || method == "PATCH" ) ) {
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if (typeof msg.payload === "string" || Buffer.isBuffer(msg.payload)) {
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payload = msg.payload;
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} else if (typeof msg.payload == "number") {
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payload = msg.payload+"";
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} else {
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if (opts.headers['content-type'] == 'application/x-www-form-urlencoded') {
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payload = querystring.stringify(msg.payload);
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} else {
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payload = JSON.stringify(msg.payload);
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if (opts.headers['content-type'] == null) {
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opts.headers['content-type'] = "application/json";
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}
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}
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}
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if (opts.headers['content-length'] == null) {
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opts.headers['content-length'] = Buffer.byteLength(payload);
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}
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}
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var req = ((/^https/.test(url))?https:http).request(opts,function(res) {
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(node.ret === "bin") ? res.setEncoding('binary') : res.setEncoding('utf8');
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msg.statusCode = res.statusCode;
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msg.headers = res.headers;
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msg.payload = "";
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msg.url = url;
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res.on('data',function(chunk) {
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msg.payload += chunk;
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});
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res.on('end',function() {
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if (node.metric()) {
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// Calculate request time
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var diff = process.hrtime(preRequestTimestamp);
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var ms = diff[0] * 1e3 + diff[1] * 1e-6;
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var metricRequestDurationMillis = ms.toFixed(3);
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node.metric("duration.millis", msg, metricRequestDurationMillis);
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if(res.client && res.client.bytesRead) {
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node.metric("size.bytes", msg, res.client.bytesRead);
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}
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}
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if (node.ret === "bin") {
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msg.payload = new Buffer(msg.payload,"binary");
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}
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else if (node.ret === "obj") {
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try { msg.payload = JSON.parse(msg.payload); }
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catch(e) { node.warn("JSON parse error"); }
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}
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node.send(msg);
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node.status({});
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});
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});
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req.on('error',function(err) {
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msg.payload = err.toString() + " : " + url;
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msg.statusCode = err.code;
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node.send(msg);
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node.status({fill:"red",shape:"ring",text:err.code});
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});
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if (payload) {
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req.write(payload);
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}
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req.end();
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});
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}
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RED.nodes.registerType("http request",HTTPRequest,{
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credentials: {
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user: {type:"text"},
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password: {type: "password"}
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}
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});
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}
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