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Add mavenArtifact function to standard library #12 
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‎doc/api.md‎

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| [javac](api/javac.md) | Compiles java files. |
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| [junit](api/junit.md) | Runs junit tests. |
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| [map](api/map.md) | Applies given function to each element of an array. |
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| [mavenArtifact](api/mavenArtifact.md) | Downloads a Java library from Maven Central repository. |
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| [not](api/not.md) | Returns negation of its argument. |
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| [or](api/or.md) | Returns `true` if any argument is `true`. |
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| [size](api/size.md) | Returns size of an array. |

‎doc/api/mavenArtifact.md‎

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## File mavenArtifact<>(String groupId, String artifactId, String version)
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Downloads a Java library from Maven Central repository.
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| Name | Type | Default | Description |
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|------------|--------|---------|------------------------------------------------------------|
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| groupId | String | | Group ID of the Maven artifact (e.g., "org.junit.jupiter") |
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| artifactId | String | | Artifact ID of the Maven artifact (e.g., "junit-jupiter") |
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| version | String | | Version of the Maven artifact (e.g., "5.8.1") |
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Returns __File__ containing the downloaded JAR file.
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### examples
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Download JUnit Jupiter API:
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```
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File junit = mavenArtifact("org.junit.jupiter", "junit-jupiter-api", "5.8.1");
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```
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Download Google Guava:
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```
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File guava = mavenArtifact("com.google.guava", "guava", "31.1-jre");
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```

‎src/standard-library/src/main/java/org/smoothbuild/stdlib/java/MavenArtifactFunc.java‎

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package org.smoothbuild.stdlib.java;
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import static java.lang.Thread.currentThread;
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import static java.net.http.HttpResponse.BodyHandlers.ofInputStream;
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import static okio.Okio.buffer;
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import static okio.Okio.source;
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import java.io.IOException;
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import java.net.URI;
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import java.net.http.HttpClient;
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import java.net.http.HttpRequest;
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import org.smoothbuild.virtualmachine.bytecode.BytecodeException;
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import org.smoothbuild.virtualmachine.bytecode.expr.base.BString;
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import org.smoothbuild.virtualmachine.bytecode.expr.base.BTuple;
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import org.smoothbuild.virtualmachine.bytecode.expr.base.BValue;
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import org.smoothbuild.virtualmachine.evaluate.plugin.NativeApi;
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public class MavenArtifactFunc {
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public static BValue func(NativeApi nativeApi, BTuple args) throws BytecodeException {
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try (var httpClient = HttpClient.newHttpClient()) {
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return func(nativeApi, args, httpClient);
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}
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}
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static BValue func(NativeApi nativeApi, BTuple args, HttpClient httpClient)
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throws BytecodeException {
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var coordinate = mavenCoordinate(args);
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try {
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var response = httpClient.send(httpRequest(coordinate.url()), ofInputStream());
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if (response.statusCode() != 200) {
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var template =
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"""
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Failed to download Maven artifact %s
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from %s
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Status code: %d""";
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var message = template.formatted(coordinate, coordinate.url(), response.statusCode());
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nativeApi.log().error(message);
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return null;
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}
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try (var blobBuilder = nativeApi.factory().blobBuilder()) {
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try (var sourceBuffer = buffer(source(response.body()))) {
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sourceBuffer.readAll(blobBuilder);
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}
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var content = blobBuilder.build();
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var jarName = nativeApi.factory().string(coordinate.jarName());
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return nativeApi.factory().file(content, jarName);
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}
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} catch (IOException e) {
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nativeApi.log().error("Error downloading Maven artifact: " + e.getMessage());
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return null;
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} catch (InterruptedException e) {
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nativeApi.log().error("Error downloading Maven artifact: " + e.getMessage());
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currentThread().interrupt();
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return null;
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}
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}
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private static HttpRequest httpRequest(String mavenUrl) {
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return HttpRequest.newBuilder().uri(URI.create(mavenUrl)).GET().build();
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}
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private static MavenCoordinate mavenCoordinate(BTuple args) throws BytecodeException {
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String groupIdPath = ((BString) args.get(0)).toJavaString();
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String artifactIdStr = ((BString) args.get(1)).toJavaString();
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String versionStr = ((BString) args.get(2)).toJavaString();
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return new MavenCoordinate(groupIdPath, artifactIdStr, versionStr);
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}
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}

‎src/standard-library/src/main/java/org/smoothbuild/stdlib/java/MavenCoordinate.java‎

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package org.smoothbuild.stdlib.java;
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import static java.util.Objects.requireNonNull;
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public record MavenCoordinate(String groupId, String artifactId, String version) {
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private static final String MAVEN_CENTRAL_URL = "https://repo1.maven.org/maven2";
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public MavenCoordinate {
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requireNonNull(groupId, "groupId cannot be null");
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requireNonNull(artifactId, "artifactId cannot be null");
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requireNonNull(version, "version cannot be null");
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}
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public String url() {
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var groupIdPath = groupId.replace('.', '/');
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return MAVEN_CENTRAL_URL + "/" + groupIdPath + "/" + artifactId + "/" + version + "/"
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+ jarName();
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}
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public String jarName() {
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return artifactId + "-" + version + ".jar";
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}
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@Override
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public String toString() {
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return groupId + ":" + artifactId + ":" + version;
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}
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}

‎src/standard-library/src/main/smooth/std_lib.smooth‎

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@Native("org.smoothbuild.stdlib.compress.ZipFunc")
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Blob compressZip([File] files);
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@Native("org.smoothbuild.stdlib.java.MavenFunc")
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File mavenArtifact(String groupId, String artifactId, String version);
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A id<A>(A a) = a;
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@Native("org.smoothbuild.stdlib.core.ErrorFunc")

‎src/standard-library/src/test/java/org/smoothbuild/stdlib/java/MavenArtifactFuncTest.java‎

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package org.smoothbuild.stdlib.java;
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import static com.google.common.truth.Truth.assertThat;
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import static org.mockito.ArgumentMatchers.any;
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import static org.mockito.ArgumentMatchers.eq;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.when;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.net.http.HttpClient;
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import java.net.http.HttpRequest;
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import java.net.http.HttpResponse;
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import java.net.http.HttpResponse.BodyHandlers;
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import org.junit.jupiter.api.Test;
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import org.smoothbuild.virtualmachine.testing.VmTestContext;
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public class MavenArtifactFuncTest extends VmTestContext {
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@Test
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void downloads_artifact_via_http_client() throws Exception {
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var jarContent = "jar content";
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HttpClient httpClient = mock();
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HttpResponse<InputStream> response = mock();
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when(httpClient.send(any(HttpRequest.class), eq(BodyHandlers.ofInputStream())))
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.thenReturn(response);
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when(response.statusCode()).thenReturn(200);
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when(response.body()).thenReturn(new ByteArrayInputStream(jarContent.getBytes()));
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var result = MavenArtifactFunc.func(
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nativeApi(),
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bTuple(bString("com.example"), bString("library"), bString("1.0.0")),
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httpClient);
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assertThat(result).isEqualTo(bFile("library-1.0.0.jar", jarContent));
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}
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@Test
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void reports_error_when_downloading_fails() throws Exception {
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HttpClient httpClient = mock();
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HttpResponse<InputStream> response = mock();
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when(httpClient.send(any(HttpRequest.class), eq(BodyHandlers.ofInputStream())))
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.thenReturn(response);
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when(response.statusCode()).thenReturn(404);
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var nativeApi = nativeApi();
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var result = MavenArtifactFunc.func(
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nativeApi,
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bTuple(bString("com.example"), bString("library"), bString("1.0.0")),
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httpClient);
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assertThat(result).isNull();
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assertThat(nativeApi.messages())
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.isEqualTo(
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bArray(
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bErrorLog(
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"""
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Failed to download Maven artifact com.example:library:1.0.0
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from https://repo1.maven.org/maven2/com/example/library/1.0.0/library-1.0.0.jar
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Status code: 404""")));
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}
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}

‎src/standard-library/src/test/java/org/smoothbuild/stdlib/java/MavenCoordinateTest.java‎

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package org.smoothbuild.stdlib.java;
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import static com.google.common.truth.Truth.assertThat;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import org.junit.jupiter.api.Nested;
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import org.junit.jupiter.api.Test;
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public class MavenCoordinateTest {
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@Test
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void to_string() {
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var mavenCoordinate = new MavenCoordinate("com.example", "example", "1.0.0");
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assertThat(mavenCoordinate.toString()).isEqualTo("com.example:example:1.0.0");
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}
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@Nested
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class _url {
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@Test
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void with_simple_groupId() {
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var mavenCoordinate = new MavenCoordinate("group", "artifact", "1.0.0");
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assertThat(mavenCoordinate.url())
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.isEqualTo("https://repo1.maven.org/maven2/group/artifact/1.0.0/artifact-1.0.0.jar");
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}
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@Test
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void with_dotted_groupId() {
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var mavenCoordinate = new MavenCoordinate("com.example.group", "artifact", "1.0.0");
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assertThat(mavenCoordinate.url())
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.isEqualTo(
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"https://repo1.maven.org/maven2/com/example/group/artifact/1.0.0/artifact-1.0.0.jar");
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}
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}
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@Test
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void jar_name() {
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var mavenCoordinate = new MavenCoordinate("group", "artifact", "1.0.0");
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assertThat(mavenCoordinate.jarName()).isEqualTo("artifact-1.0.0.jar");
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}
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@Test
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void null_groupId_throws_exception() {
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assertThrows(
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NullPointerException.class, () -> new MavenCoordinate(null, "artifact", "version"));
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}
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@Test
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void null_artifactId_throws_exception() {
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assertThrows(NullPointerException.class, () -> new MavenCoordinate("group", null, "version"));
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}
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@Test
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void null_version_throws_exception() {
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assertThrows(NullPointerException.class, () -> new MavenCoordinate("group", "artifact", null));
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}
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}

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