Add support for remote --in-jar URLs

You can now provide an HTTP URL to --in-jar and
it will be downloaded to a temporary file before
remapping. Example:

java -jar target/SpecialSource-1.3-SNAPSHOT-shaded.jar --in-jar http://assets.minecraft.net/1_4_7/minecraft_server.jar --out-jar /tmp/net.jar --srg-in ../MinecraftForge/mcp/conf/

src/main/java/net/md_5/specialsource/SpecialSource.java

@@ -29,11 +29,8 @@
 package net.md_5.specialsource;
 
 import java.io.*;
-import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
 
-import com.google.common.base.Joiner;
 import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
 import joptsimple.OptionException;
@@ -83,7 +80,7 @@ public class SpecialSource {
 
                 acceptsAll(asList("i", "in-jar"), "Input jar to remap")
                         .withRequiredArg()
-                        .ofType(File.class);
+                        .ofType(String.class);
 
                 acceptsAll(asList("o", "out-jar"), "Output jar to write")
                         .withRequiredArg()
@@ -211,11 +208,12 @@ public class SpecialSource {
                 return;
             }
 
-            log("Remapping final jar");
-            Jar jar3 = Jar.init((File) options.valueOf("in-jar"));
+            URLDownloader.verbose = !options.has("quiet");
+            Jar jar3 = Jar.init(URLDownloader.getLocalFile((String) options.valueOf("in-jar")));
 
             inheritanceProviders.add(new JarInheritanceProvider(jar3));
 
+            log("Remapping final jar");
             JarRemapper jarRemapper = new JarRemapper(jarMapping);
             jarRemapper.remapJar(jar3, (File) options.valueOf("out-jar"));
         }

src/main/java/net/md_5/specialsource/URLDownloader.java

@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) 2012, md_5. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * The name of the author may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.md_5.specialsource;
+
+import com.google.common.io.Files;
+
+import java.io.*;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class URLDownloader {
+
+    private URL url;
+    public static boolean verbose = true;
+
+    public URLDownloader(String urlString) throws MalformedURLException {
+        this.url = new URL(urlString);
+    }
+
+    public File download() throws IOException {
+        if (verbose) {
+            System.out.println("Downloading "+url);
+        }
+
+        url.openConnection();
+        InputStream inputStream = url.openStream();
+
+        String path = url.getPath();
+        String baseName = URLDownloader.getNameWithoutExtension(path);
+        String extension = Files.getFileExtension(path);
+
+        File tempFile = File.createTempFile(baseName, "." + extension);
+        FileOutputStream outputStream = new FileOutputStream(tempFile);
+
+        byte[] buffer = new byte[4096];
+        int n = 0;
+        while ((n = inputStream.read(buffer)) != -1) {
+            outputStream.write(buffer, 0, n);
+        }
+
+        inputStream.close();
+        outputStream.close();
+
+        if (verbose) {
+            System.out.println("Downloaded to "+tempFile.getPath());
+        }
+
+        return tempFile;
+    }
+
+    public static File getLocalFile(String string) throws IOException {
+        if (new File(string).exists()) {
+            return new File(string);
+        }
+
+        if (string.startsWith("http://") || string.startsWith("https://")) {
+            URLDownloader downloader = new URLDownloader(string);
+            return downloader.download();
+        } else {
+            throw new FileNotFoundException(string);
+        }
+    }
+
+    // Borrowed from Guava 13 (since we're on Guava 12) - TODO: remove and use Guava after https://github.com/MinecraftForge/FML/commit/937e9a016936195e4dc51f33ab9e8dde52621684
+    /**
+     * Returns the file name without its
+     * <a href="http://en.wikipedia.org/wiki/Filename_extension">file extension</a> or path. This is
+     * similar to the {@code basename} unix command. The result does not include the '{@code .}'.
+     *
+     * @param file The name of the file to trim the extension from. This can be either a fully
+     *     qualified file name (including a path) or just a file name.
+     * @return The file name without its path or extension.
+     * @since 14.0
+     */
+    public static String getNameWithoutExtension(String file) {
+        String fileName = new File(file).getName();
+        int dotIndex = fileName.lastIndexOf('.');
+        return (dotIndex == -1) ? fileName : fileName.substring(0, dotIndex);
+    }
+}