[BENCH-4609] Add a new Utility method isServiceAccount

src/main/java/bio/terra/common/iam/IamUtils.java

@@ -0,0 +1,18 @@
+package bio.terra.common.iam;
+
+public final class IamUtils {
+
+	/**
+	 * Check whether the provided email address is a service account.
+	 *
+	 * @param email
+	 * @return true if the email address is a service account
+	 */
+	public static boolean isServiceAccount(String email) {
+		if (email == null) {
+			return false;
+		}
+		return email.matches("\\S+@\\S*gserviceaccount\\.com$");
+	}
+
+}

src/test/java/bio/terra/common/iam/IamUtilsTest.java

@@ -0,0 +1,33 @@
+package bio.terra.common.iam;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class IamUtilsTest {
+
+	@Test
+	public void isServiceAccountWithValidServiceAccountEmail() {
+		assertTrue(IamUtils.isServiceAccount("user@gserviceaccount.com"));
+	}
+
+	@Test
+	public void isServiceAccountWithInvalidServiceAccountEmail() {
+		assertFalse(IamUtils.isServiceAccount("user@verily.com"));
+	}
+
+	@Test
+	public void isServiceAccountWithWhitespaceInEmail() {
+		assertFalse(IamUtils.isServiceAccount(" user@gserviceaccount.com"));
+	}
+
+	@Test
+	public void isServiceAccountWithEmptyEmail() {
+		assertFalse(IamUtils.isServiceAccount(""));
+	}
+
+	@Test
+	public void isServiceAccountWithNullEmail() {
+		assertFalse(IamUtils.isServiceAccount(null));
+	}
+}