change grade build to sign application from external properties file

build.gradle

@@ -11,10 +11,6 @@ buildscript {
 apply plugin: 'com.android.application'
 apply plugin: 'witness'
 
-if(project.hasProperty("duckduckgo.signing") && new File(project.property("duckduckgo.signing")).exists()) {
-    apply from: project.property("duckduckgo.signing");
-}
-
 android {
   compileSdkVersion 23
   buildToolsVersion "23.0.1"
@@ -60,13 +56,24 @@ android {
     }
   }
 
+  signingConfigs {
+    release
+  }
+
   buildTypes {
     debug {
       debuggable true
       jniDebuggable true
       minifyEnabled false
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
     }
+    release {
+      signingConfig signingConfigs.release
+    }
+  }
+
+  lintOptions {
+    abortOnError false
   }
 
   applicationVariants.all { variant ->
@@ -82,4 +89,24 @@ android {
       }
     }
   }
+
+  def Properties props = new Properties()
+  def propFile = new File('/Users/jenkins/jenkins_static/duckduckgo_android/ddg_android_build.properties')
+  if (propFile.exists()){
+      props.load(new FileInputStream(propFile))
+
+    if (props!=null && props.containsKey('key.store') && props.containsKey('key.store.password') &&
+        props.containsKey('key.alias') && props.containsKey('key.alias.password')) {
+      android.signingConfigs.release.storeFile = file(props['key.store'])
+      android.signingConfigs.release.storePassword = props['key.store.password']
+      android.signingConfigs.release.keyAlias = props['key.alias']
+      android.signingConfigs.release.keyPassword = props['key.alias.password']
+    } else {
+      println 'signing.properties found but some entries are missing'
+      android.buildTypes.release.signingConfig = null
+    }
+  } else {
+    println 'signing.properties not found'
+    android.buildTypes.release.signingConfig = null
+  }
 }