Add configuration for disabling/enabling spoofing

Set default value to enable spoofing and explicitly set this value in the editor service in docker-compose to retain current behavior

connects to #309

__tests__/Config.test.js

@@ -12,6 +12,10 @@ describe('Config', () => {
       expect(Config.sinopiaUrl).toEqual('https://sinopia.io')
     })
 
+    it('spoof sinopia server has static value', () => {
+      expect(Config.spoofSinopiaServer).toEqual(true)
+    })
+
     it('aws client ID has static value', () => {
       expect(Config.awsClientID).toEqual('2u6s7pqkc1grq1qs464fsi82at')
     })
@@ -52,6 +56,7 @@ describe('Config', () => {
 
     beforeAll(() => {
       process.env = {
+        SPOOF_SINOPIA_SERVER: 'false',
         SINOPIA_URI: 'sinopia.foo',
         COGNITO_CLIENT_ID: '1a2b3c',
         AWS_COGNITO_DOMAIN: 'sinopia-foo.amazoncognito.com'
@@ -62,6 +67,10 @@ describe('Config', () => {
       expect(Config.sinopiaUrl).toEqual('https://sinopia.foo')
     })
 
+    it('spoof sinopia server has static value', () => {
+      expect(Config.spoofSinopiaServer).toEqual(false)
+    })
+
     it('aws client ID has static value', () => {
       expect(Config.awsClientID).toEqual('1a2b3c')
     })

docker-compose.yml

@@ -3,6 +3,8 @@ services:
   editor:
     build:
       context: .
+    environment:
+      SPOOF_SINOPIA_SERVER: true
     ports:
       - 8000:8000
     depends_on:

src/Config.js

@@ -7,6 +7,17 @@ class Config {
     return `https://${this.sinopiaDomainName}`
   }
 
+  static get spoofSinopiaServer() {
+    // There are two value types of `process.env` variables:
+    //   1. When undefined, `if` condition it not satisfied and default `true` is returned
+    //   2. When defined, will always be a string.
+    //     a. When set to 'true' return `true` (use spoof)
+    //     b. When set to 'false' or any other string, return `false` (don't use spoof)
+    if (process.env.SPOOF_SINOPIA_SERVER)
+      return process.env.SPOOF_SINOPIA_SERVER === 'true'
+    return true
+  }
+
   static get awsClientID() {
     return process.env.COGNITO_CLIENT_ID || '2u6s7pqkc1grq1qs464fsi82at'
   }