Handles k8s style bindings

When a binding is provided as a mounted ConfigMap/Secret pair (containing
metadata and secret values respectively) the files within the metadata and
secret directories will be symlinks to files in a colocated hidden directory
that contains the content. In order to handle bindings presented in this
format a Binding object will ignore hidden files and directories when it is
contructed using a path. This prevents errors that previously occured
when the Binding assumed all metadata and secret entries were regular files, and
attempted to read the content of those directories directly.

Resolves #40

Signed-off-by: Emily Casey <ecasey@pivotal.io>

src/main/java/org/springframework/cloud/bindings/Binding.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.cloud.bindings;
 
+import java.io.File;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
@@ -141,6 +142,8 @@ public final class Binding {
     private Map<String, String> createFilePerEntryMap(Path path) {
         try {
             return Files.list(path)
+                    .filter(p -> !p.getFileName().toString().startsWith("."))
+                    .filter(p -> !new File(p.toString()).isDirectory())
                     .collect(Collectors.toMap(
                             p -> p.getFileName().toString(),
                             p -> {

src/test/java/org/springframework/cloud/bindings/BindingTest.java

@@ -39,4 +39,17 @@ final class BindingTest {
                 .isEqualTo(Paths.get("src/test/resources/test-name-1/secret/test-key"));
     }
 
+    @Test
+    @DisplayName("populates k8s style content from filesystem")
+    void testK8s() {
+        //When bindings are provided as a k8s configmap secret pairs data files will be symlinks to hidden directories
+        Binding binding = new Binding(Paths.get("src/test/resources/test-k8s"));
+
+        assertThat(binding.getKind()).isEqualTo("test-kind-1");
+        assertThat(binding.getProvider()).isEqualTo("test-provider-1");
+        assertThat(binding.getMetadataFilePath("test-key"))
+                .isEqualTo(Paths.get("src/test/resources/test-k8s/metadata/test-key"));
+        assertThat(binding.getSecretFilePath("test-key"))
+                .isEqualTo(Paths.get("src/test/resources/test-k8s/secret/test-key"));
+    }
 }

src/test/java/org/springframework/cloud/bindings/BindingsTests.java

@@ -65,7 +65,7 @@ final class BindingsTests {
             String path = "src/test/resources";
             Bindings b = new Bindings(path);
 
-            assertThat(b.getBindings()).hasSize(2);
+            assertThat(b.getBindings()).hasSize(3);
         }
 
     }
@@ -102,5 +102,4 @@ final class BindingsTests {
         }
 
     }
-
 }

src/test/java/org/springframework/cloud/bindings/boot/BindingSpecificEnvironmentPostProcessorTest.java

@@ -98,7 +98,7 @@ final class BindingSpecificEnvironmentPostProcessorTest {
     @Test
     @DisplayName("included implementations are registered")
     void includedImplementations() {
-        assertThat(new BindingSpecificEnvironmentPostProcessor().processors).hasSize(14);
+        assertThat(new BindingSpecificEnvironmentPostProcessor().processors).hasSize(15);
     }
 
 }

src/test/resources/test-k8s/metadata/.hidden-data

@@ -0,0 +1 @@
+.hidden-data-1

src/test/resources/test-k8s/metadata/.hidden-data-1/kind

@@ -0,0 +1 @@
+test-kind-1

src/test/resources/test-k8s/metadata/.hidden-data-1/provider

@@ -0,0 +1 @@
+test-provider-1

src/test/resources/test-k8s/metadata/kind

@@ -0,0 +1 @@
+.hidden-data/kind

src/test/resources/test-k8s/metadata/provider

@@ -0,0 +1 @@
+.hidden-data/provider

src/test/resources/test-k8s/secret/.hidden-data

@@ -0,0 +1 @@
+.hidden-data-1

src/test/resources/test-k8s/secret/.hidden-data-1/test-key

@@ -0,0 +1 @@
+test-value

src/test/resources/test-k8s/secret/test-key

@@ -0,0 +1 @@
+.hidden-data/test-key