Merge pull request #1 from harobed/44-add-headers-to-docker-image

Add HEADERS environment variable to allow header in graphql req…

Author: harobed

README.md

@@ -220,7 +220,9 @@ app.use(router.allowedMethods());
 app.listen(3001);
 ```
 
-## Build Docker Image
+## Docker image
+
+### Build
 
 ```
 $ npm install
@@ -232,5 +234,13 @@ $ docker build . -f docker-image/Dockerfile -t apisguru/graphql-voyager
 $ docker push apisguru/graphql-voyager
 ```
 
+### Configuration
+
+You can config docker image with environment variable
+
+- `PORT` to change listen port
+- `GRAPHQL_ENDPOINT` address of graphql API
+- `HEADER` headers to add to request, formated as 'header1=value1&header2=value2'
+
 ## Credits
 This tool is inspired by [graphql-visualizer](https://github.com/NathanRSmith/graphql-visualizer) project.

docker-image/index.js

@@ -3,7 +3,26 @@ const voyager = require('graphql-voyager/middleware');
 
 const app = express();
 
-app.use('/', voyager.express({ endpointUrl: process.env.GRAPHQL_ENDPOINT }));
+const headersJS = (() => {
+  if (!process.env.HEADERS || typeof process.env.HEADERS !== 'string') {
+    return {};
+  };
+  const headers = {};
+
+  process.env.HEADERS.split('&').forEach(header => {
+      let headerSplit = header.split('=');
+
+    if (headerSplit.length === 2) {
+        headers[headerSplit[0]] = headerSplit[1];
+      }
+  });
+  return JSON.stringify(headers);
+})()
+
+app.use('/', voyager.express({
+  endpointUrl: process.env.GRAPHQL_ENDPOINT,
+  headersJS: headersJS
+}));
 
 process.on('SIGINT', function () {
   console.log("\nGracefully shutting down from SIGINT (Ctrl-C)");