Interpolate property values for repositories

Update RepositoryConfigurationFactory to apply a RegexBasedInterpolator
to repository IDs and URLs.

Fixes gh-4318
Closes gh-4319

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/RepositoryConfigurationFactory.java

@@ -23,6 +23,10 @@ import java.util.List;
 
 import org.apache.maven.settings.Profile;
 import org.apache.maven.settings.Repository;
+import org.codehaus.plexus.interpolation.InterpolationException;
+import org.codehaus.plexus.interpolation.Interpolator;
+import org.codehaus.plexus.interpolation.PropertiesBasedValueSource;
+import org.codehaus.plexus.interpolation.RegexBasedInterpolator;
 
 import org.springframework.boot.cli.compiler.grape.RepositoryConfiguration;
 import org.springframework.boot.cli.compiler.maven.MavenSettings;
@@ -78,17 +82,37 @@ public final class RepositoryConfigurationFactory {
 	}
 
 	private static void addActiveProfileRepositories(List<Profile> activeProfiles,
-			List<RepositoryConfiguration> repositoryConfiguration) {
+			List<RepositoryConfiguration> configurations) {
 		for (Profile activeProfile : activeProfiles) {
+			Interpolator interpolator = new RegexBasedInterpolator();
+			interpolator.addValueSource(
+					new PropertiesBasedValueSource(activeProfile.getProperties()));
 			for (Repository repository : activeProfile.getRepositories()) {
-				repositoryConfiguration.add(new RepositoryConfiguration(
+				configurations.add(getRepositoryConfiguration(interpolator, repository));
-						repository.getId(), URI.create(repository.getUrl()),
-						repository.getSnapshots() != null
-								? repository.getSnapshots().isEnabled() : false));
 			}
 		}
 	}
 
+	private static RepositoryConfiguration getRepositoryConfiguration(
+			Interpolator interpolator, Repository repository) {
+		String name = interpolate(interpolator, repository.getId());
+		String url = interpolate(interpolator, repository.getUrl());
+		boolean snapshotsEnabled = false;
+		if (repository.getSnapshots() != null) {
+			snapshotsEnabled = repository.getSnapshots().isEnabled();
+		}
+		return new RepositoryConfiguration(name, URI.create(url), snapshotsEnabled);
+	}
+
+	private static String interpolate(Interpolator interpolator, String value) {
+		try {
+			return interpolator.interpolate(value);
+		}
+		catch (InterpolationException ex) {
+			return value;
+		}
+	}
+
 	private static File getLocalRepositoryDirectory(String localRepository) {
 		if (StringUtils.hasText(localRepository)) {
 			return new File(localRepository);

spring-boot-cli/src/test/java/org/springframework/boot/cli/compiler/RepositoryConfigurationFactoryTests.java

@@ -90,6 +90,21 @@ public class RepositoryConfigurationFactoryTests {
 				"foo:bar");
 	}
 
+	@Test
+	public void interpolationProfileRepositories() {
+		SystemProperties.doWithSystemProperties(new Runnable() {
+			@Override
+			public void run() {
+				List<RepositoryConfiguration> repositoryConfiguration = RepositoryConfigurationFactory
+						.createDefaultRepositoryConfiguration();
+				assertRepositoryConfiguration(repositoryConfiguration, "central", "local",
+						"spring-snapshot", "spring-milestone", "interpolate-releases",
+						"interpolate-snapshots");
+			}
+		}, "user.home:src/test/resources/maven-settings/active-profile-repositories",
+				"interpolate:true");
+	}
+
 	private void assertRepositoryConfiguration(
 			List<RepositoryConfiguration> configurations, String... expectedNames) {
 		assertThat(configurations, hasSize(expectedNames.length));

spring-boot-cli/src/test/resources/maven-settings/active-profile-repositories/.m2/settings.xml

@@ -56,6 +56,42 @@
 				</repository>
 			</repositories>
 		</profile>
+		<profile>
+			<id>interpolation-profile</id>
+			<activation>
+      			<property>
+        			<name>interpolate</name>
+        			<value>true</value>
+      			</property>
+			</activation>
+			<properties>
+				<repo.base>maven.example.com</repo.base>
+				<repo.content>${repo.base}/content</repo.content>
+			</properties>
+			<repositories>
+				<repository>
+					<id>interpolate-releases</id>
+					<url>${repo.content}/releases</url>
+					<releases>
+						<enabled>true</enabled>
+						<updatePolicy>never</updatePolicy>
+					</releases>
+					<snapshots>
+						<enabled>false</enabled>
+					</snapshots>
+				</repository>
+				<repository>
+					<id>interpolate-snapshots</id>
+					<url>${repo.content}/snapshots</url>
+					<releases>
+						<enabled>false</enabled>
+					</releases>
+					<snapshots>
+						<enabled>true</enabled>
+					</snapshots>
+				</repository>
+			</repositories>
+		</profile>
 	</profiles>
 
 </settings>