Add gradle task to register service providers

.gitignore

@@ -34,4 +34,5 @@ app/libs/javarosa-libraries.jar
 build/
 **/*~
 app/google-services.json
-app/fabric.properties
+app/fabric.properties
+app/src/META-INF/

app/build.gradle

@@ -161,17 +161,21 @@ ext {
     HQ_API_PASSWORD = project.properties['HQ_API_PASSWORD'] ?: ""
     TEST_BUILD_TYPE = project.properties['TEST_BUILD_TYPE'] ?: "debug"
     FIREBASE_DATABASE_URL = project.properties['FIREBASE_DATABASE_URL'] ?: ""
+
+    // properties related to Service providers
+    SERVICE_PROVIDERS = ["org.commcare.util.IEncryptionKeyProvider" : "org.commcare.utils.EncryptionKeyProvider"]
+    SERVICE_PROVIDERS_REL_DIR = "META-INF/services"
 }
 
 afterEvaluate {
     // Hack to get assets to show up in robolectric tests; try to eventually remove this
-    preCommcareDebugUnitTestBuild.dependsOn mergeCommcareDebugAssets
-    processStandaloneDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
-    processStandaloneReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
-    processLtsDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
-    processLtsReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
-    processCommcareDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
-    processCommcareReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile
+    preCommcareDebugUnitTestBuild.dependsOn mergeCommcareDebugAssets, registerServiceProviders
+    processStandaloneDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
+    processStandaloneReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
+    processLtsDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
+    processLtsReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
+    processCommcareDebugGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
+    processCommcareReleaseGoogleServices.dependsOn injectPropertiesIntoFirebaseConfigFile, registerServiceProviders
 }
 
 /**
@@ -632,3 +636,17 @@ downloadLicenses {
     includeProjectDependencies = true
     dependencyConfiguration = 'compile'
 }
+
+task registerServiceProviders {
+    doLast {
+        def servProvAbsPath = android.sourceSets.main.java.srcDirs[0].path + File.separator + project.ext.SERVICE_PROVIDERS_REL_DIR
+        project.ext.SERVICE_PROVIDERS.each { servProv ->
+            println(servProvAbsPath  + File.separator + "$servProv.key")
+            def file = new File(servProvAbsPath  + File.separator + "$servProv.key")
+            if(!file.getParentFile().exists()) {
+                file.getParentFile().mkdirs()
+            }
+            file.write("$entry.value")
+        }
+    }
+}