Add cli option to enable CORS

Update oasgraph-cli package in order to add ability
to enable cors if needed by adding `--cors` to the cli.

Signed-off-by: Anthony Guimard <[email protected]>

Author: Anthony Guimard

packages/oasgraph-cli/lib/oasgraph.js

@@ -43,6 +43,7 @@
   },
   "dependencies": {
     "commander": "^2.19.0",
+    "cors": "^2.8.5",
     "express": "^4.16.4",
     "express-graphql": "^0.7.1",
     "graphql": "^14.0.2",

packages/oasgraph-cli/lib/oasgraph.js.map

@@ -2,6 +2,7 @@
 
 import * as express from 'express'
 import * as graphqlHTTP from 'express-graphql'
+import * as cors from 'cors'
 import { createGraphQlSchema } from 'oasgraph'
 import * as path from 'path'
 import * as request from 'request'
@@ -25,6 +26,7 @@ program
   .option('-s, --strict', 'throw an error if OASGraph cannot run without compensating for errors or missing data in the OAS')
   .option('-a, --addSubOperations', 'nest operations based on path hierarchy')
   .option('-f, --fillEmptyResponses', 'create placeholder schemas for operations with HTTP status code 204 (no response) rather than ignore them')
+  .option('--cors', 'enable Cross-origin resource sharing (CORS)')
   .option('--no-viewer', 'do not create GraphQL viewer objects for passing authentication credentials')
   .option('--save <file path>', 'save schema to path and do not start server')
   .action(function (path) {
@@ -42,16 +44,16 @@ if (program.port) {
   portNumber = program.port
 }
 
-// check if the file exists 
+// check if the file exists
 if (fs.existsSync(path.resolve(filePath))) {
   try {
     let oas = readFile(path.resolve(filePath))
     startGraphQLServer(oas, portNumber)
   } catch (e) {
     console.error(e)
   }
-  
-} else { 
+
+} else {
   // falls back to a remote location
   if (filePath.match(/^https?/g)) {
     getRemoteFileSpec(filePath).then(remoteContent=> {
@@ -105,7 +107,7 @@ function getRemoteFileSpec (uri) {
 }
 
 /**
- * generates a GraphQL schema and starts the GraphQL server on the specified port 
+ * generates a GraphQL schema and starts the GraphQL server on the specified port
  * @param {Object} oas the OAS specification file
  * @param {number} port the port number to listen on on this server
  */
@@ -117,14 +119,19 @@ function startGraphQLServer(oas, port) {
     addSubOperations: program.addSubOperations,
     fillEmptyResponses: program.fillEmptyResponses,
     baseUrl: program.url
-  }) 
+  })
      .then(({schema, report}) => {
       console.log(JSON.stringify(report, null, 2))
 
-      // save local file if required 
+      // save local file if required
       if (program.save) {
         writeSchema(schema);
       } else {
+        // Enable CORS
+        if (program.cors) {
+          app.use(cors());
+        }
+
         // mounting graphql endpoint using the middleware express-graphql
         app.use('/graphql', graphqlHTTP({
           schema: schema,
@@ -144,7 +151,7 @@ function startGraphQLServer(oas, port) {
 
 /**
  * saves a grahpQL schema generated by OASGraph to a file
- * @param {createGraphQlSchema} schema 
+ * @param {createGraphQlSchema} schema
  */
 function writeSchema(schema){
   fs.writeFile(program.save, printSchema(schema), (err) => {