add config to specify available providers for each component

boilerplate/config/communication.json

@@ -1,6 +1,7 @@
 {
   "default": {
     "enabled": true,
-    "provider": "whisper"
+    "provider": "whisper",
+    "available_providers": ["whisper", "orbit"]
   }
 }

boilerplate/config/storage.json

@@ -3,6 +3,7 @@
     "enabled": true,
     "ipfs_bin": "ipfs",
     "provider": "ipfs",
+    "available_providers": ["ipfs"],
     "host": "localhost",
     "port": 5001
   },

demo/config/communication.json

@@ -1,6 +1,7 @@
 {
   "default": {
     "enabled": true,
-    "provider": "whisper"
+    "provider": "whisper",
+    "available_providers": ["whisper", "orbit"]
   }
 }

demo/config/storage.json

@@ -3,6 +3,7 @@
     "enabled": true,
     "ipfs_bin": "ipfs",
     "provider": "ipfs",
+    "available_providers": ["ipfs"],
     "host": "localhost",
     "port": 5001
   },

lib/core/config.js

@@ -114,6 +114,9 @@ Config.prototype.loadStorageConfigFile = function() {
   if (this.storageConfig.enabled === undefined) {
     this.storageConfig.enabled = true;
   }
+  if (this.storageConfig.available_providers === undefined) {
+    this.storageConfig.available_providers = [];
+  }
 };
 
 Config.prototype.loadCommunicationConfigFile = function() {
@@ -139,6 +142,9 @@ Config.prototype.loadCommunicationConfigFile = function() {
   if (this.communicationConfig.enabled === undefined) {
     this.communicationConfig.enabled = true;
   }
+  if (this.communicationConfig.available_providers === undefined) {
+    this.communicationConfig.available_providers = [];
+  }
 };
 
 Config.prototype.loadEmbarkConfigFile = function() {
@@ -181,15 +187,15 @@ Config.prototype.loadFiles = function(files) {
   }).filter(function(file) {
     if (file === 'embark.js') {
 
-      if (self.blockchainConfig.enabled || self.communicationConfig.provider === 'whisper') {
+      if (self.blockchainConfig.enabled || self.communicationConfig.provider === 'whisper' || self.communicationConfig.available_providers.indexOf('whisper') >= 0) {
         readFiles.push({filename: 'web3.js',   content: fs.readFileSync(fs.embarkPath("js/web3.js")).toString(), path: fs.embarkPath("js/web3.js")});
       }
 
-      if (self.storageConfig.enabled && self.storageConfig.provider === 'ipfs') {
+      if (self.storageConfig.enabled && (self.storageConfig.provider === 'ipfs' || self.storageConfig.available_providers.indexOf('ipfs') >= 0)) {
         readFiles.push({filename: 'ipfs.js',   content: fs.readFileSync(fs.embarkPath("js/ipfs.js")).toString(), path: fs.embarkPath("js/ipfs.js")});
       }
 
-      if (self.communicationConfig.enabled && self.communicationConfig.provider === 'orbit') {
+      if (self.communicationConfig.enabled && (self.communicationConfig.provider === 'orbit' || self.communicationConfig.available_providers.indexOf('orbit') >= 0)) {
         // TODO: remove duplicated files if functionality is the same for storage and orbit
         readFiles.push({filename: 'ipfs-api.js',   content: fs.readFileSync(fs.embarkPath("js/ipfs-api.min.js")).toString(), path: fs.embarkPath("js/ipfs-api.min.js")});
         readFiles.push({filename: 'orbit.js',  content: fs.readFileSync(fs.embarkPath("js/orbit.min.js")).toString(), path: fs.embarkPath("js/orbit.min.js")});

test_app/config/communication.json

@@ -1,6 +1,7 @@
 {
   "default": {
     "enabled": true,
-    "provider": "whisper"
+    "provider": "whisper",
+    "available_providers": ["whisper", "orbit"]
   }
 }

test_app/config/storage.json

@@ -1,6 +1,7 @@
 {
   "default": {
     "enabled": true,
+    "available_providers": ["ipfs"],
     "ipfs_bin": "ipfs",
     "provider": "ipfs",
     "host": "localhost",