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node-red/nodes/core/io/21-httpin.js

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/**
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* Copyright 2013,2015 IBM Corp.
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*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
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module.exports = function(RED) {
"use strict";
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var http = require("follow-redirects").http;
var https = require("follow-redirects").https;
var urllib = require("url");
var express = require("express");
var getBody = require('raw-body');
var mustache = require("mustache");
var querystring = require("querystring");
var cors = require('cors');
var jsonParser = express.json();
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 = "";
req._body = true;
getBody(req, {
limit: '1mb',
length: req.headers['content-length'],
encoding: 'utf8'
}, function (err, buf) {
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if (err) { return next(err); }
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req.body = buf;
next();
});
}
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function HTTPIn(n) {
RED.nodes.createNode(this,n);
if (RED.settings.httpNodeRoot !== false) {
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this.url = n.url;
this.method = n.method;
this.swaggerDoc = n.swaggerDoc;
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var node = this;
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this.errorHandler = function(err,req,res,next) {
node.warn(err);
res.send(500);
};
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this.callback = function(req,res) {
var msgid = RED.util.generateId();
res._msgid = msgid;
if (node.method.match(/(^post$|^delete$|^put$|^options$)/)) {
node.send({_msgid:msgid,req:req,res:res,payload:req.body});
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} else if (node.method == "get") {
node.send({_msgid:msgid,req:req,res:res,payload:req.query});
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} else {
node.send({_msgid:msgid,req:req,res:res});
}
};
var corsHandler = function(req,res,next) { next(); }
if (RED.settings.httpNodeCors) {
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corsHandler = cors(RED.settings.httpNodeCors);
RED.httpNode.options(this.url,corsHandler);
}
var httpMiddleware = function(req,res,next) { next(); }
if (RED.settings.httpNodeMiddleware) {
if (typeof RED.settings.httpNodeMiddleware === "function") {
httpMiddleware = RED.settings.httpNodeMiddleware;
}
}
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var metricsHandler = function(req,res,next) { next(); }
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if (this.metric()) {
metricsHandler = function(req, res, next) {
var startAt = process.hrtime();
onHeaders(res, function() {
if (res._msgid) {
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var diff = process.hrtime(startAt);
var ms = diff[0] * 1e3 + diff[1] * 1e-6;
var metricResponseTime = ms.toFixed(3);
var metricContentLength = res._headers["content-length"];
//assuming that _id has been set for res._metrics in HttpOut node!
node.metric("response.time.millis", {_msgid:res._msgid} , metricResponseTime);
node.metric("response.content-length.bytes", {_msgid:res._msgid} , metricContentLength);
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}
});
next();
};
}
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if (this.method == "get") {
RED.httpNode.get(this.url,httpMiddleware,corsHandler,metricsHandler,this.callback,this.errorHandler);
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} else if (this.method == "post") {
RED.httpNode.post(this.url,httpMiddleware,corsHandler,metricsHandler,jsonParser,urlencParser,rawBodyParser,this.callback,this.errorHandler);
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} else if (this.method == "put") {
RED.httpNode.put(this.url,httpMiddleware,corsHandler,metricsHandler,jsonParser,urlencParser,rawBodyParser,this.callback,this.errorHandler);
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} else if (this.method == "delete") {
RED.httpNode.delete(this.url,httpMiddleware,corsHandler,metricsHandler,jsonParser,urlencParser,rawBodyParser,this.callback,this.errorHandler);
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}
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this.on("close",function() {
var routes = RED.httpNode.routes[this.method];
for (var i = 0; i<routes.length; i++) {
if (routes[i].path == this.url) {
routes.splice(i,1);
//break;
}
}
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if (RED.settings.httpNodeCors) {
var routes = RED.httpNode.routes['options'];
if (routes) {
for (var j = 0; j<routes.length; j++) {
if (routes[j].path == this.url) {
routes.splice(j,1);
//break;
}
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}
}
}
});
} else {
this.warn(RED._("httpin.errors.not-created"));
}
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}
RED.nodes.registerType("http in",HTTPIn);
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function HTTPOut(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input",function(msg) {
if (msg.res) {
if (msg.headers) {
msg.res.set(msg.headers);
}
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var statusCode = msg.statusCode || 200;
if (typeof msg.payload == "object" && !Buffer.isBuffer(msg.payload)) {
msg.res.jsonp(statusCode,msg.payload);
} else {
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;
} else if (Buffer.isBuffer(msg.payload)) {
len = msg.payload.length;
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} else if (typeof msg.payload == "number") {
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len = Buffer.byteLength(""+msg.payload);
} else {
len = Buffer.byteLength(msg.payload);
}
msg.res.set('content-length', len);
}
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msg.res.send(statusCode,msg.payload);
}
} else {
node.warn(RED._("httpin.errors.no-response"));
}
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});
}
RED.nodes.registerType("http response",HTTPOut);
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function HTTPRequest(n) {
RED.nodes.createNode(this,n);
var nodeUrl = n.url;
var isTemplatedUrl = (nodeUrl||"").indexOf("{{") != -1;
var nodeMethod = n.method || "GET";
this.ret = n.ret || "txt";
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var node = this;
var prox, noprox;
if (process.env.http_proxy != null) { prox = process.env.http_proxy; }
if (process.env.HTTP_PROXY != null) { prox = process.env.HTTP_PROXY; }
if (process.env.no_proxy != null) { noprox = process.env.no_proxy.split(","); }
if (process.env.NO_PROXY != null) { noprox = process.env.NO_PROXY.split(","); }
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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:RED._("httpin.status.requesting")});
var url = nodeUrl || msg.url;
if (msg.url && nodeUrl && (nodeUrl !== msg.url)) { // revert change below when warning is finally removed
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node.warn(RED._("common.errors.nooverride"));
}
if (isTemplatedUrl) {
url = mustache.render(nodeUrl,msg);
}
if (!url) {
node.error(RED._("httpin.errors.no-url"),msg);
return;
}
// url must start http:// or https:// so assume http:// if not set
if (!((url.indexOf("http://") === 0) || (url.indexOf("https://") === 0))) {
url = "http://"+url;
}
var method = nodeMethod.toUpperCase() || "GET";
if (msg.method && n.method && (n.method !== "use")) { // warn if override option not set
node.warn(RED._("httpin.errors.not-overridden"));
}
if (msg.method && n.method && (n.method === "use")) {
method = msg.method.toUpperCase(); // use the msg parameter
}
var opts = urllib.parse(url);
opts.method = method;
opts.headers = {};
if (msg.headers) {
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for (var v in msg.headers) {
if (msg.headers.hasOwnProperty(v)) {
var name = v.toLowerCase();
if (name !== "content-type" && name !== "content-length") {
// only normalise the known headers used later in this
// function. Otherwise leave them alone.
name = v;
}
opts.headers[name] = msg.headers[v];
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}
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}
}
if (this.credentials && this.credentials.user) {
opts.auth = this.credentials.user+":"+(this.credentials.password||"");
}
var payload = null;
if (msg.payload && (method == "POST" || method == "PUT" || method == "PATCH" ) ) {
if (typeof msg.payload === "string" || Buffer.isBuffer(msg.payload)) {
payload = msg.payload;
} else if (typeof msg.payload == "number") {
payload = msg.payload+"";
} else {
if (opts.headers['content-type'] == 'application/x-www-form-urlencoded') {
payload = querystring.stringify(msg.payload);
} else {
payload = JSON.stringify(msg.payload);
if (opts.headers['content-type'] == null) {
opts.headers['content-type'] = "application/json";
}
}
}
if (opts.headers['content-length'] == null) {
if (Buffer.isBuffer(payload)) {
opts.headers['content-length'] = payload.length;
} else {
opts.headers['content-length'] = Buffer.byteLength(payload);
}
}
}
var urltotest = url;
var noproxy;
if (noprox) {
for (var i in noprox) {
if (url.indexOf(noprox[i]) !== -1) { noproxy=true; }
}
}
if (prox && !noproxy) {
var match = prox.match(/^(http:\/\/)?(.+)?:([0-9]+)?/i);
if (match) {
//opts.protocol = "http:";
//opts.host = opts.hostname = match[2];
//opts.port = (match[3] != null ? match[3] : 80);
opts.headers['Host'] = opts.host;
var heads = opts.headers;
var path = opts.pathname = opts.href;
opts = urllib.parse(prox);
opts.path = opts.pathname = path;
opts.headers = heads;
//console.log(opts);
urltotest = match[0];
}
else { node.warn("Bad proxy url: "+process.env.http_proxy); }
}
var req = ((/^https/.test(urltotest))?https:http).request(opts,function(res) {
(node.ret === "bin") ? res.setEncoding('binary') : res.setEncoding('utf8');
msg.statusCode = res.statusCode;
msg.headers = res.headers;
msg.payload = "";
// msg.url = url; // revert when warning above finally removed
res.on('data',function(chunk) {
msg.payload += chunk;
});
res.on('end',function() {
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if (node.metric()) {
// Calculate request time
var diff = process.hrtime(preRequestTimestamp);
var ms = diff[0] * 1e3 + diff[1] * 1e-6;
var metricRequestDurationMillis = ms.toFixed(3);
node.metric("duration.millis", msg, metricRequestDurationMillis);
if (res.client && res.client.bytesRead) {
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node.metric("size.bytes", msg, res.client.bytesRead);
}
}
if (node.ret === "bin") {
msg.payload = new Buffer(msg.payload,"binary");
}
else if (node.ret === "obj") {
try { msg.payload = JSON.parse(msg.payload); }
catch(e) { node.warn(RED._("httpin.errors.json-error")); }
}
node.send(msg);
node.status({});
});
});
req.on('error',function(err) {
msg.payload = err.toString() + " : " + url;
msg.statusCode = err.code;
node.send(msg);
node.status({fill:"red",shape:"ring",text:err.code});
});
if (payload) {
req.write(payload);
}
req.end();
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});
}
RED.nodes.registerType("http request",HTTPRequest,{
credentials: {
user: {type:"text"},
password: {type: "password"}
}
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});
}