PIE-1526: Fix account permissioning check case matching (#1314)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

ethereum/permissioning/src/main/java/tech/pegasys/pantheon/ethereum/permissioning/AccountWhitelistController.java

@@ -141,7 +141,7 @@ public class AccountWhitelistController {
   }
 
   public boolean contains(final String account) {
-    return (accountWhitelist.contains(account));
+    return accountWhitelist.stream().anyMatch(a -> a.equalsIgnoreCase(account));
   }
 
   public List<String> getAccountWhitelist() {

ethereum/permissioning/src/test/java/tech/pegasys/pantheon/ethereum/permissioning/AccountWhitelistControllerTest.java

@@ -231,6 +231,16 @@ public class AccountWhitelistControllerTest {
         .isTrue();
   }
 
+  @Test
+  public void shouldMatchAccountsWithInconsistentCasing() {
+    when(permissioningConfig.isAccountWhitelistEnabled()).thenReturn(true);
+    when(permissioningConfig.getAccountWhitelist())
+        .thenReturn(singletonList("0xfe3b557e8fb62b89f4916b721be55ceb828dbd73"));
+    controller = new AccountWhitelistController(permissioningConfig, whitelistPersistor);
+
+    assertThat(controller.contains("0xFE3B557E8Fb62b89F4916B721be55cEb828dBd73")).isTrue();
+  }
+
   private Path createPermissionsFileWithAccount(final String account) throws IOException {
     final String nodePermissionsFileContent = "accounts-whitelist=[\"" + account + "\"]";
     final Path permissionsFile = Files.createTempFile("account_permissions", "");