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Check hash of existing file in case a download is not required.

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This commit is contained in:
sk89q 2014-01-15 02:16:04 -08:00
parent f6fb3139a2
commit 70057607ad
1 changed files with 26 additions and 4 deletions
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30
src/main/java/com/skcraft/launcher/model/modpack/FileInstall.java
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@ -7,6 +7,9 @@
package com.skcraft.launcher.model.modpack;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import com.google.common.io.Files;
import com.skcraft.launcher.install.InstallLog;
import com.skcraft.launcher.install.InstallLogFileMover;
import com.skcraft.launcher.install.Installer;
@ -17,7 +20,7 @@ import lombok.NonNull;
import org.apache.commons.io.FilenameUtils;
import java.io.File;
import java.net.MalformedURLException;
import java.io.IOException;
import java.net.URL;
import static com.google.common.base.Preconditions.checkNotNull;
@ -27,6 +30,7 @@ import static com.skcraft.launcher.LauncherUtils.concat;
@EqualsAndHashCode(callSuper = false)
public class FileInstall extends ManifestEntry {
private static HashFunction hf = Hashing.sha1();
private String version;
private String hash;
private String location;
@ -46,7 +50,7 @@ public class FileInstall extends ManifestEntry {
@Override
public void install(@NonNull Installer installer, @NonNull InstallLog log,
@NonNull UpdateCache cache, @NonNull File contentDir) throws MalformedURLException {
@NonNull UpdateCache cache, @NonNull File contentDir) throws IOException {
if (getWhen() != null && !getWhen().matches()) {
return;
}
@ -56,8 +60,7 @@ public class FileInstall extends ManifestEntry {
String fileVersion = getImpliedVersion();
URL url = concat(getManifest().getObjectsUrl(), getLocation());
if (!(isUserFile() && targetFile.exists()) &&
(!targetFile.exists() || cache.mark(FilenameUtils.normalize(targetPath), fileVersion))) {
if (shouldUpdate(cache, targetFile)) {
long size = this.size;
if (size <= 0) {
size = 10 * 1024;
@ -70,4 +73,23 @@ public class FileInstall extends ManifestEntry {
}
}
private boolean shouldUpdate(UpdateCache cache, File targetFile) throws IOException {
if (targetFile.exists() && isUserFile()) {
return false;
}
if (!targetFile.exists()) {
return true;
}
if (hash != null) {
String existingHash = Files.hash(targetFile, hf).toString();
if (existingHash.equalsIgnoreCase(hash)) {
return false;
}
}
return cache.mark(FilenameUtils.normalize(getTargetPath()), getImpliedVersion());
}
}