fix: support mTLS in 1.0 Binary and Structured emitters

This commit modifies both of the 1.0 emitters so that they may
accept typed objects as a part of the configuration. When using
mTLS in Node, you need to provide an `Agent` to the underlying
HTTP handler. In this case, Axios will pass this object along to
Node.js when it is provided.

Fixes: https://github.com/cloudevents/sdk-javascript/issues/48

Signed-off-by: Lance Ball <lball@redhat.com>

lib/bindings/http/emitter_binary.js

@@ -2,58 +2,48 @@ var axios = require("axios");
 var empty = require("is-empty");
 
 const Constants = require("./constants.js");
+const defaults = {};
+defaults[Constants.HEADERS] = {};
+defaults[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE] = Constants.DEFAULT_CONTENT_TYPE;
 
 function BinaryHTTPEmitter(config, headerByGetter, extensionPrefix){
-  this.config = JSON.parse(JSON.stringify(config));
+  this.config = Object.assign({}, defaults, config);
   this.headerByGetter = headerByGetter;
   this.extensionPrefix = extensionPrefix;
-
-  this.config[Constants.HEADERS] =
-    (!this.config[Constants.HEADERS]
-      ? {}
-      : this.config[Constants.HEADERS]);
-
-  // default is json
-  if(!this.config[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE]){
-    this.config[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE] =
-      Constants.DEFAULT_CONTENT_TYPE;
-  }
 }
 
-BinaryHTTPEmitter.prototype.emit = function(cloudevent) {
-  // Create new request object
-  var _config = JSON.parse(JSON.stringify(this.config));
-
-  // Always set stuff in _config
-  var _headers = _config[Constants.HEADERS];
+BinaryHTTPEmitter.prototype.emit = function (cloudevent) {
+  const config = Object.assign({}, this.config);
+  const headers = Object.assign({}, this.config[Constants.HEADERS]);
 
   Object.keys(this.headerByGetter)
     .filter((getter) => cloudevent[getter]())
     .forEach((getter) => {
-      let header = this.headerByGetter[getter];
-      _headers[header.name] =
+      const header = this.headerByGetter[getter];
+      headers[header.name] =
         header.parser(
           cloudevent[getter]()
         );
     });
 
   // Set the cloudevent payload
-  let formatted = cloudevent.format();
+  const formatted = cloudevent.format();
   let data = formatted.data;
   data = (formatted.data_base64 ? formatted.data_base64: data);
 
-  _config[Constants.DATA_ATTRIBUTE] = data;
-
   // Have extensions?
-  var exts = cloudevent.getExtensions();
+  const exts = cloudevent.getExtensions();
   Object.keys(exts)
     .filter((ext) => Object.hasOwnProperty.call(exts, ext))
     .forEach((ext) => {
-      _headers[this.extensionPrefix + ext] = exts[ext];
+      headers[this.extensionPrefix + ext] = exts[ext];
     });
 
-  // Return the Promise
-  return axios.request(_config);
-};
+  config[Constants.DATA_ATTRIBUTE] = data;
+  config.headers = headers;
+
+    // Return the Promise
+  return axios.request(config);
+ };
 
 module.exports = BinaryHTTPEmitter;

lib/bindings/http/emitter_structured.js

@@ -1,30 +1,23 @@
 var axios = require("axios");
 
 const Constants = require("./constants.js");
+const defaults = {};
+defaults[Constants.HEADERS] = {};
+defaults[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE] = Constants.DEFAULT_CE_CONTENT_TYPE;
 
 function StructuredHTTPEmitter(configuration){
-  this.config = JSON.parse(JSON.stringify(configuration));
-
-  this.config[Constants.HEADERS] =
-    (!this.config[Constants.HEADERS]
-      ? {}
-      : this.config[Constants.HEADERS]);
-
-  if(!this.config[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE]){
-    this.config[Constants.HEADERS][Constants.HEADER_CONTENT_TYPE] =
-      Constants.DEFAULT_CE_CONTENT_TYPE;
-  }
+  this.config = Object.assign({}, defaults, configuration);
 }
 
-StructuredHTTPEmitter.prototype.emit = function(cloudevent) {
-  // Create new request object
-  var _config = JSON.parse(JSON.stringify(this.config));
-
+StructuredHTTPEmitter.prototype.emit = function (cloudevent) {
   // Set the cloudevent payload
-  _config[Constants.DATA_ATTRIBUTE] = cloudevent.format();
+  this.config[Constants.DATA_ATTRIBUTE] = cloudevent.format();
 
   // Return the Promise
-  return axios.request(_config);
+  return axios.request(this.config).then(response => {
+    delete this.config[Constants.DATA_ATTRIBUTE];
+    return response;
+  });
 };
 
 module.exports = StructuredHTTPEmitter;

test/http_binding_1.js

@@ -1,14 +1,14 @@
 const expect = require("chai").expect;
 const nock = require("nock");
-const http = require("http");
-const request = require("request");
+const https = require("https");
 const {asBase64} = require("../lib/utils/fun.js");
 
-const BinaryHTTPEmitter =
-  require("../lib/bindings/http/emitter_binary_1.js");
-const Cloudevent = require("../lib/cloudevent.js");
-
-const v1 = require("../v1/index.js");
+const {
+  Spec,
+  BinaryHTTPEmitter,
+  StructuredHTTPEmitter,
+  Cloudevent
+} = require("../v1/index.js");
 
 const type        = "com.github.pull.create";
 const source      = "urn:event:from:myapi/resourse/123";
@@ -28,7 +28,7 @@ const ext2Name  = "extension2";
 const ext2Value = "acme";
 
 const cloudevent =
-  new Cloudevent(v1.Spec)
+  new Cloudevent(Spec)
     .type(type)
     .source(source)
     .dataContentType(ceContentType)
@@ -48,7 +48,7 @@ const httpcfg = {
 };
 
 const binary = new BinaryHTTPEmitter(httpcfg);
-const structured = new v1.StructuredHTTPEmitter(httpcfg);
+const structured = new StructuredHTTPEmitter(httpcfg);
 
 describe("HTTP Transport Binding - Version 1.0", () => {
   beforeEach(() => {
@@ -59,6 +59,21 @@ describe("HTTP Transport Binding - Version 1.0", () => {
   });
 
   describe("Structured", () => {
+    it('works with mTLS authentication', () => {
+      const event = new StructuredHTTPEmitter({
+        method: 'POST',
+        url: `${webhook}/json`,
+        httpsAgent: new https.Agent({
+          cert: 'some value',
+          key: 'other value'
+        })
+      })
+      return event.emit(cloudevent).then(response => {
+        expect(response.config.headers['Content-Type'])
+          .to.equal(contentType);
+      });
+    });
+
     describe("JSON Format", () => {
       it("requires '" + contentType + "' Content-Type in the header", () => {
         return structured.emit(cloudevent)
@@ -81,7 +96,7 @@ describe("HTTP Transport Binding - Version 1.0", () => {
           let bindata = Uint32Array.from(dataString, (c) => c.codePointAt(0));
           let expected = asBase64(bindata);
           let binevent =
-            new Cloudevent(v1.Spec)
+            new Cloudevent(Spec)
               .type(type)
               .source(source)
               .dataContentType("text/plain")
@@ -98,7 +113,7 @@ describe("HTTP Transport Binding - Version 1.0", () => {
 
         it("the payload must have 'data_base64' when data is binary", () => {
           let binevent =
-            new Cloudevent(v1.Spec)
+            new Cloudevent(Spec)
               .type(type)
               .source(source)
               .dataContentType("text/plain")
@@ -117,6 +132,21 @@ describe("HTTP Transport Binding - Version 1.0", () => {
   });
 
   describe("Binary", () => {
+    it('works with mTLS authentication', () => {
+      const event = new BinaryHTTPEmitter({
+        method: 'POST',
+        url: `${webhook}/json`,
+        httpsAgent: new https.Agent({
+          cert: 'some value',
+          key: 'other value'
+        })
+      })
+      return event.emit(cloudevent).then(response => {
+        expect(response.config.headers['Content-Type'])
+          .to.equal(cloudevent.getDataContentType());
+      });
+    });
+
     describe("JSON Format", () => {
       it("requires '" + cloudevent.getDataContentType() + "' Content-Type in the header", () => {
         return binary.emit(cloudevent)
@@ -138,7 +168,7 @@ describe("HTTP Transport Binding - Version 1.0", () => {
         let bindata = Uint32Array.from(dataString, (c) => c.codePointAt(0));
         let expected = asBase64(bindata);
         let binevent =
-          new Cloudevent(v1.Spec)
+          new Cloudevent(Spec)
             .type(type)
             .source(source)
             .dataContentType("text/plain")

v1/index.js

@@ -22,5 +22,7 @@ module.exports = {
   BinaryHTTPEmitter,
   StructuredHTTPReceiver,
   BinaryHTTPReceiver,
+  Cloudevent: event,
+  CloudEvent: event,
   event
 };