SONAR-2106: New Java library to bootstrap project analysis

* Add BatchResourcesServlet to allow downloading libraries from server

* Create in memory POM for non-maven environments

* Provide fake MavenPluginExecutor for non-maven environments

* Add new module sonar-batch-maven-compat with shaded maven-project

5 files changed, 318 insertions, 0 deletions

diff --git a/sonar-batch-bootstrapper/pom.xml b/sonar-batch-bootstrapper/pom.xml
new file mode 100644
index 00000000000..75a7498f456
--- /dev/null
+++ b/sonar-batch-bootstrapper/pom.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.codehaus.sonar</groupId>
+    <artifactId>sonar</artifactId>
+    <version>2.6-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>sonar-batch-bootstrapper</artifactId>
+  <name>Sonar :: Batch Bootstrapper</name>
+  <description>Provides API to bootstrap Sonar Batch.</description>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.hamcrest</groupId>
+      <artifactId>hamcrest-all</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>
diff --git a/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BatchDownloader.java b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BatchDownloader.java
new file mode 100644
index 00000000000..b5eba165324
--- /dev/null
+++ b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BatchDownloader.java
@@ -0,0 +1,134 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.batch.bootstrapper;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BatchDownloader {
+
+  private static final String VERSION_PATH = "/api/server/version";
+  private static final String BATCH_PATH = "/batch/";
+
+  public static final int CONNECT_TIMEOUT_MILLISECONDS = 30000;
+  public static final int READ_TIMEOUT_MILLISECONDS = 60000;
+
+  private String serverUrl;
+  private String serverVersion;
+
+  public BatchDownloader(String serverUrl) {
+    if (serverUrl.endsWith("/")) {
+      this.serverUrl = serverUrl.substring(0, serverUrl.length() - 1);
+    } else {
+      this.serverUrl = serverUrl;
+    }
+  }
+
+  /**
+   * @return server url
+   */
+  public String getServerUrl() {
+    return serverUrl;
+  }
+
+  /**
+   * @return server version
+   */
+  public String getServerVersion() {
+    if (serverVersion == null) {
+      try {
+        serverVersion = remoteContent(VERSION_PATH);
+      } catch (IOException e) {
+        throw new RuntimeException(e.getMessage(), e);
+      }
+    }
+    return serverVersion;
+  }
+
+  /**
+   * @return list of downloaded files
+   */
+  public List<File> downloadBatchFiles(File toDir) {
+    try {
+      List<File> files = new ArrayList<File>();
+
+      String libs = remoteContent(BATCH_PATH);
+
+      for (String lib : libs.split(",")) {
+        File file = new File(toDir, lib);
+        remoteContentToFile(BATCH_PATH + lib, file);
+        files.add(file);
+      }
+
+      return files;
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private void remoteContentToFile(String path, File toFile) {
+    InputStream input = null;
+    FileOutputStream output = null;
+    String fullUrl = serverUrl + path;
+    try {
+      HttpURLConnection connection = newHttpConnection(new URL(fullUrl));
+      output = new FileOutputStream(toFile, false);
+      input = connection.getInputStream();
+      BootstrapperIOUtils.copyLarge(input, output);
+    } catch (Exception e) {
+      BootstrapperIOUtils.closeQuietly(output);
+      BootstrapperIOUtils.deleteFileQuietly(toFile);
+      throw new RuntimeException("Fail to download the file: " + fullUrl);
+    } finally {
+      BootstrapperIOUtils.closeQuietly(input);
+      BootstrapperIOUtils.closeQuietly(output);
+    }
+  }
+
+  String remoteContent(String path) throws IOException {
+    String fullUrl = serverUrl + path;
+    HttpURLConnection conn = newHttpConnection(new URL(fullUrl));
+    Reader reader = new InputStreamReader((InputStream) conn.getContent());
+    try {
+      int statusCode = conn.getResponseCode();
+      if (statusCode != HttpURLConnection.HTTP_OK) {
+        throw new IOException("Status returned by url : '" + fullUrl + "' is invalid : " + statusCode);
+      }
+      return BootstrapperIOUtils.toString(reader);
+    } finally {
+      BootstrapperIOUtils.closeQuietly(reader);
+      conn.disconnect();
+    }
+  }
+
+  static HttpURLConnection newHttpConnection(URL url) throws IOException {
+    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+    connection.setConnectTimeout(CONNECT_TIMEOUT_MILLISECONDS);
+    connection.setReadTimeout(READ_TIMEOUT_MILLISECONDS);
+    connection.setInstanceFollowRedirects(true);
+    connection.setRequestMethod("GET");
+    // TODO connection.setRequestProperty("User-Agent", userAgent);
+    return connection;
+  }
+
+}
diff --git a/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BootstrapperIOUtils.java b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BootstrapperIOUtils.java
new file mode 100644
index 00000000000..c764ac50105
--- /dev/null
+++ b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/BootstrapperIOUtils.java
@@ -0,0 +1,79 @@
+package org.sonar.batch.bootstrapper;
+
+import java.io.*;
+
+final class BootstrapperIOUtils {
+
+  private BootstrapperIOUtils() {
+  }
+
+  /**
+   * The default buffer size to use.
+   */
+  private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
+
+  /**
+   * Unconditionally close a <code>Closeable</code>.
+   */
+  public static void closeQuietly(Closeable closeable) {
+    try {
+      if (closeable != null) {
+        closeable.close();
+      }
+    } catch (IOException ioe) {
+      // ignore
+    }
+  }
+
+  /**
+   * Get the contents of a <code>Reader</code> as a String.
+   */
+  public static String toString(Reader input) throws IOException {
+    StringWriter sw = new StringWriter();
+    copyLarge(input, sw);
+    return sw.toString();
+  }
+
+  /**
+   * Copy bytes from an <code>InputStream</code> to an <code>OutputStream</code>.
+   */
+  public static long copyLarge(InputStream input, OutputStream output) throws IOException {
+    byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
+    long count = 0;
+    int n = 0;
+    while (-1 != (n = input.read(buffer))) {
+      output.write(buffer, 0, n);
+      count += n;
+    }
+    return count;
+  }
+
+  /**
+   * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
+   */
+  public static long copyLarge(Reader input, Writer output) throws IOException {
+    char[] buffer = new char[DEFAULT_BUFFER_SIZE];
+    long count = 0;
+    int n = 0;
+    while (-1 != (n = input.read(buffer))) {
+      output.write(buffer, 0, n);
+      count += n;
+    }
+    return count;
+  }
+
+  /**
+   * Deletes a file (not a directory).
+   */
+  public static boolean deleteFileQuietly(File file) {
+    if (file == null) {
+      return false;
+    }
+    try {
+      return file.delete();
+    } catch (Exception e) {
+      return false;
+    }
+  }
+
+}
diff --git a/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/package-info.java b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/package-info.java
new file mode 100644
index 00000000000..7c23a7aa9ec
--- /dev/null
+++ b/sonar-batch-bootstrapper/src/main/java/org/sonar/batch/bootstrapper/package-info.java
@@ -0,0 +1,24 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+
+/**
+ * Provides API to bootstrap Sonar Batch.
+ */
+package org.sonar.batch.bootstrapper;
\ No newline at end of file
diff --git a/sonar-batch-bootstrapper/src/test/java/org/sonar/batch/bootstrapper/BatchDownloaderTest.java b/sonar-batch-bootstrapper/src/test/java/org/sonar/batch/bootstrapper/BatchDownloaderTest.java
new file mode 100644
index 00000000000..1822a53f014
--- /dev/null
+++ b/sonar-batch-bootstrapper/src/test/java/org/sonar/batch/bootstrapper/BatchDownloaderTest.java
@@ -0,0 +1,54 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.batch.bootstrapper;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
+public class BatchDownloaderTest {
+
+  @Test
+  public void shouldRemoveLastUrlSlash() {
+    BatchDownloader bootstrapper = new BatchDownloader("http://test/");
+    assertThat(bootstrapper.getServerUrl(), is("http://test"));
+  }
+
+  @Test(expected = Exception.class)
+  public void shouldFailIfCanNotConnectServer() {
+    BatchDownloader bootstrapper = new BatchDownloader("http://unknown.foo");
+    bootstrapper.getServerVersion();
+  }
+
+  @Test
+  public void shouldReturnValidVersion() {
+    BatchDownloader bootstrapper = new BatchDownloader("http://test") {
+      @Override
+      String remoteContent(String path) throws IOException {
+        return "2.6";
+      }
+    };
+    assertThat(bootstrapper.getServerVersion(), is("2.6"));
+  }
+
+}