Merge pull request #74 from horizontalsystems/optional-secret

Make Infura secret key optional.

Author: rafaelekol

ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/core/EthereumKit.kt

@@ -228,7 +228,7 @@ class EthereumKit(
         class ApiSyncMode : SyncMode()
     }
 
-    data class InfuraCredentials(val projectId: String, val secretKey: String)
+    data class InfuraCredentials(val projectId: String, val secretKey: String?)
 
     enum class NetworkType {
         MainNet,

ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/network/InfuraService.kt

@@ -39,7 +39,9 @@ class InfuraService(private val networkType: NetworkType, private val infuraCred
 
         val headersInterceptor = Interceptor { chain ->
             val requestBuilder = chain.request().newBuilder()
-            requestBuilder.header("Authorization", Credentials.basic("", infuraCredentials.secretKey))
+            infuraCredentials.secretKey?.let { secretKey ->
+                requestBuilder.header("Authorization", Credentials.basic("", secretKey))
+            }
             requestBuilder.header("Content-Type", "application/json")
             requestBuilder.header("Accept", "application/json")
             chain.proceed(requestBuilder.build())