Make maps key externally configurable.

.gitignore

@@ -27,3 +27,4 @@ obj/
 jni/libspeex/.deps/
 pkcs11.password
 dev.keystore
+maps.key

app/build.gradle

@@ -171,6 +171,8 @@ android {
         vectorDrawables.useSupportLibrary = true
         project.ext.set("archivesBaseName", "Signal");
 
+        manifestPlaceholders = [mapsKey:"AIzaSyCSx9xea86GwDKGznCAULE9Y5a8b-TfN9U"]
+
         buildConfigField "long", "BUILD_TIMESTAMP", getLastCommitTimestamp() + "L"
         buildConfigField "String", "GIT_HASH", "\"${getGitHash()}\""
         buildConfigField "String", "SIGNAL_URL", "\"https://chat.signal.org\""
@@ -263,6 +265,8 @@ android {
             testProguardFiles 'proguard/proguard-automation.pro',
                     'proguard/proguard.cfg'
 
+            manifestPlaceholders = [mapsKey:getMapsKey()]
+
             buildConfigField "String", "BUILD_VARIANT_TYPE", "\"Debug\""
         }
 
@@ -637,3 +641,11 @@ def getDateSuffix() {
     def formattedDate = date.format('yyyy-MM-dd-HH:mm')
     return formattedDate
 }
+
+def getMapsKey() {
+    def mapKey = file("${project.rootDir}/maps.key")
+    if (mapKey.exists()) {
+        return mapKey.readLines()[0]
+    }
+    return "AIzaSyCSx9xea86GwDKGznCAULE9Y5a8b-TfN9U"
+}

app/src/main/AndroidManifest.xml

@@ -109,7 +109,7 @@
 
     <meta-data
             android:name="com.google.android.geo.API_KEY"
-            android:value="AIzaSyCSx9xea86GwDKGznCAULE9Y5a8b-TfN9U"/>
+            android:value="${mapsKey}"/>
 
     <meta-data android:name="android.supports_size_changes"
                android:value="true" />