Add a Proguard build optimisation task

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Make text field in the directory choosing widget always 15 characters wide
+- Significantly reduce the size of the jar
 
 ## [0.1.1] - 2019-05-23
 

build.gradle

@@ -15,6 +15,15 @@
  * along with Impact Installer.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+import proguard.gradle.ProGuardTask
+
+buildscript {
+    dependencies {
+        classpath 'net.sf.proguard:proguard-gradle:6.1.0'
+        classpath 'net.sf.proguard:proguard-base:6.1.0'
+    }
+}
+
 plugins {
     id 'java'
     id 'com.github.johnrengelman.shadow' version '4.0.4'
@@ -54,18 +63,48 @@ jar {
 }
 
 shadowJar {
-    classifier = ''
+    classifier = 'unoptimised'
+}
+
+task('optimize', type: ProGuardTask, dependsOn: shadowJar) {
+    injars tasks.shadowJar.outputs.files
+    outjars "${buildDir}/libs/${project.tasks.jar.archiveName}"
+    libraryjars "${System.getProperty('java.home')}/lib/rt.jar"
+    configuration "${projectDir}/proguard.conf"
+
+    verbose()
+    dontwarn()
+
+    keepattributes 'Signature'
+    keepattributes '*Annotation*'
+    optimizationpasses 9
+    dontusemixedcaseclassnames()
+
+    keepdirectories 'icons'
+
+    keep 'class io.github.ImpactDevelopment.installer.** { *; }'
+
+    [
+            // keep only the RSA stuff from bouncycastle
+            'org.bouncycastle.jcajce.provider.asymmetric.rsa.PSSSignatureSpi$SHA512withRSA',
+            'org.bouncycastle.jcajce.provider.asymmetric.rsa.DigestSignatureSpi$SHA512',
+            'org.bouncycastle.jcajce.provider.asymmetric.rsa.DigestSignatureSpi$SHA256',
+            'org.bouncycastle.jcajce.provider.asymmetric.rsa.KeyFactorySpi',
+            'org.bouncycastle.jcajce.provider.asymmetric.RSA$Mappings'
+    ].each {
+        keep "class ${it}"
+    }
 }
 
 createExe {
-    dependsOn 'build'
+    dependsOn 'optimize'
     mainClassName = project.mainClassName
-    copyConfigurable = project.tasks.shadowJar.outputs.files
-    jar = "lib/${project.tasks.shadowJar.archiveName}"
-    outfile = tasks.shadowJar.archiveName - ".jar" + ".exe"
+    copyConfigurable = project.tasks.optimize.outputs.files
+    jar = "lib/${project.tasks.jar.archiveName}"
+    outfile = tasks.jar.archiveName - ".jar" + ".exe"
     icon = "${projectDir}/Icon.ico"
     companyName = 'ImpactDevelopment'
     copyright = 'Copyright (C) Impact Developers'
 }
 
-build.dependsOn(shadowJar)
+build.finalizedBy(createExe)

proguard.conf

@@ -0,0 +1,288 @@
+# Keep - Applications. Keep all application classes, along with their 'main'
+# methods.
+-keepclasseswithmembers public class * {
+    public static void main(java.lang.String[]);
+}
+
+# Also keep - Enumerations. Keep the special static methods that are required in
+# enumeration classes.
+-keepclassmembers enum  * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+# Also keep - Database drivers. Keep all implementations of java.sql.Driver.
+-keep class * extends java.sql.Driver
+
+# Also keep - Swing UI L&F. Keep all extensions of javax.swing.plaf.ComponentUI,
+# along with the special 'createUI' method.
+-keep class * extends javax.swing.plaf.ComponentUI {
+    public static javax.swing.plaf.ComponentUI createUI(javax.swing.JComponent);
+}
+
+# Keep names - Native method names. Keep all native class/method names.
+-keepclasseswithmembers,includedescriptorclasses,allowshrinking class * {
+    native <methods>;
+}
+
+# Remove - System method calls. Remove all invocations of System
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.System {
+    public static long currentTimeMillis();
+    static java.lang.Class getCallerClass();
+    public static int identityHashCode(java.lang.Object);
+    public static java.lang.SecurityManager getSecurityManager();
+    public static java.util.Properties getProperties();
+    public static java.lang.String getProperty(java.lang.String);
+    public static java.lang.String getenv(java.lang.String);
+    public static java.lang.String mapLibraryName(java.lang.String);
+    public static java.lang.String getProperty(java.lang.String,java.lang.String);
+}
+
+# Remove - Math method calls. Remove all invocations of Math
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.Math {
+    public static double sin(double);
+    public static double cos(double);
+    public static double tan(double);
+    public static double asin(double);
+    public static double acos(double);
+    public static double atan(double);
+    public static double toRadians(double);
+    public static double toDegrees(double);
+    public static double exp(double);
+    public static double log(double);
+    public static double log10(double);
+    public static double sqrt(double);
+    public static double cbrt(double);
+    public static double IEEEremainder(double,double);
+    public static double ceil(double);
+    public static double floor(double);
+    public static double rint(double);
+    public static double atan2(double,double);
+    public static double pow(double,double);
+    public static int round(float);
+    public static long round(double);
+    public static double random();
+    public static int abs(int);
+    public static long abs(long);
+    public static float abs(float);
+    public static double abs(double);
+    public static int max(int,int);
+    public static long max(long,long);
+    public static float max(float,float);
+    public static double max(double,double);
+    public static int min(int,int);
+    public static long min(long,long);
+    public static float min(float,float);
+    public static double min(double,double);
+    public static double ulp(double);
+    public static float ulp(float);
+    public static double signum(double);
+    public static float signum(float);
+    public static double sinh(double);
+    public static double cosh(double);
+    public static double tanh(double);
+    public static double hypot(double,double);
+    public static double expm1(double);
+    public static double log1p(double);
+}
+
+# Remove - Number method calls. Remove all invocations of Number
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.* extends java.lang.Number {
+    public static java.lang.String toString(byte);
+    public static java.lang.Byte valueOf(byte);
+    public static byte parseByte(java.lang.String);
+    public static byte parseByte(java.lang.String,int);
+    public static java.lang.Byte valueOf(java.lang.String,int);
+    public static java.lang.Byte valueOf(java.lang.String);
+    public static java.lang.Byte decode(java.lang.String);
+    public int compareTo(java.lang.Byte);
+    public static java.lang.String toString(short);
+    public static short parseShort(java.lang.String);
+    public static short parseShort(java.lang.String,int);
+    public static java.lang.Short valueOf(java.lang.String,int);
+    public static java.lang.Short valueOf(java.lang.String);
+    public static java.lang.Short valueOf(short);
+    public static java.lang.Short decode(java.lang.String);
+    public static short reverseBytes(short);
+    public int compareTo(java.lang.Short);
+    public static java.lang.String toString(int,int);
+    public static java.lang.String toHexString(int);
+    public static java.lang.String toOctalString(int);
+    public static java.lang.String toBinaryString(int);
+    public static java.lang.String toString(int);
+    public static int parseInt(java.lang.String,int);
+    public static int parseInt(java.lang.String);
+    public static java.lang.Integer valueOf(java.lang.String,int);
+    public static java.lang.Integer valueOf(java.lang.String);
+    public static java.lang.Integer valueOf(int);
+    public static java.lang.Integer getInteger(java.lang.String);
+    public static java.lang.Integer getInteger(java.lang.String,int);
+    public static java.lang.Integer getInteger(java.lang.String,java.lang.Integer);
+    public static java.lang.Integer decode(java.lang.String);
+    public static int highestOneBit(int);
+    public static int lowestOneBit(int);
+    public static int numberOfLeadingZeros(int);
+    public static int numberOfTrailingZeros(int);
+    public static int bitCount(int);
+    public static int rotateLeft(int,int);
+    public static int rotateRight(int,int);
+    public static int reverse(int);
+    public static int signum(int);
+    public static int reverseBytes(int);
+    public int compareTo(java.lang.Integer);
+    public static java.lang.String toString(long,int);
+    public static java.lang.String toHexString(long);
+    public static java.lang.String toOctalString(long);
+    public static java.lang.String toBinaryString(long);
+    public static java.lang.String toString(long);
+    public static long parseLong(java.lang.String,int);
+    public static long parseLong(java.lang.String);
+    public static java.lang.Long valueOf(java.lang.String,int);
+    public static java.lang.Long valueOf(java.lang.String);
+    public static java.lang.Long valueOf(long);
+    public static java.lang.Long decode(java.lang.String);
+    public static java.lang.Long getLong(java.lang.String);
+    public static java.lang.Long getLong(java.lang.String,long);
+    public static java.lang.Long getLong(java.lang.String,java.lang.Long);
+    public static long highestOneBit(long);
+    public static long lowestOneBit(long);
+    public static int numberOfLeadingZeros(long);
+    public static int numberOfTrailingZeros(long);
+    public static int bitCount(long);
+    public static long rotateLeft(long,int);
+    public static long rotateRight(long,int);
+    public static long reverse(long);
+    public static int signum(long);
+    public static long reverseBytes(long);
+    public int compareTo(java.lang.Long);
+    public static java.lang.String toString(float);
+    public static java.lang.String toHexString(float);
+    public static java.lang.Float valueOf(java.lang.String);
+    public static java.lang.Float valueOf(float);
+    public static float parseFloat(java.lang.String);
+    public static boolean isNaN(float);
+    public static boolean isInfinite(float);
+    public static int floatToIntBits(float);
+    public static int floatToRawIntBits(float);
+    public static float intBitsToFloat(int);
+    public static int compare(float,float);
+    public boolean isNaN();
+    public boolean isInfinite();
+    public int compareTo(java.lang.Float);
+    public static java.lang.String toString(double);
+    public static java.lang.String toHexString(double);
+    public static java.lang.Double valueOf(java.lang.String);
+    public static java.lang.Double valueOf(double);
+    public static double parseDouble(java.lang.String);
+    public static boolean isNaN(double);
+    public static boolean isInfinite(double);
+    public static long doubleToLongBits(double);
+    public static long doubleToRawLongBits(double);
+    public static double longBitsToDouble(long);
+    public static int compare(double,double);
+    public boolean isNaN();
+    public boolean isInfinite();
+    public int compareTo(java.lang.Double);
+    public byte byteValue();
+    public short shortValue();
+    public int intValue();
+    public long longValue();
+    public float floatValue();
+    public double doubleValue();
+    public int compareTo(java.lang.Object);
+    public boolean equals(java.lang.Object);
+    public int hashCode();
+    public java.lang.String toString();
+}
+
+# Remove - String method calls. Remove all invocations of String
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.String {
+    public static java.lang.String copyValueOf(char[]);
+    public static java.lang.String copyValueOf(char[],int,int);
+    public static java.lang.String valueOf(boolean);
+    public static java.lang.String valueOf(char);
+    public static java.lang.String valueOf(char[]);
+    public static java.lang.String valueOf(char[],int,int);
+    public static java.lang.String valueOf(double);
+    public static java.lang.String valueOf(float);
+    public static java.lang.String valueOf(int);
+    public static java.lang.String valueOf(java.lang.Object);
+    public static java.lang.String valueOf(long);
+    public boolean contentEquals(java.lang.StringBuffer);
+    public boolean endsWith(java.lang.String);
+    public boolean equalsIgnoreCase(java.lang.String);
+    public boolean equals(java.lang.Object);
+    public boolean matches(java.lang.String);
+    public boolean regionMatches(boolean,int,java.lang.String,int,int);
+    public boolean regionMatches(int,java.lang.String,int,int);
+    public boolean startsWith(java.lang.String);
+    public boolean startsWith(java.lang.String,int);
+    public byte[] getBytes();
+    public byte[] getBytes(java.lang.String);
+    public char charAt(int);
+    public char[] toCharArray();
+    public int compareToIgnoreCase(java.lang.String);
+    public int compareTo(java.lang.Object);
+    public int compareTo(java.lang.String);
+    public int hashCode();
+    public int indexOf(int);
+    public int indexOf(int,int);
+    public int indexOf(java.lang.String);
+    public int indexOf(java.lang.String,int);
+    public int lastIndexOf(int);
+    public int lastIndexOf(int,int);
+    public int lastIndexOf(java.lang.String);
+    public int lastIndexOf(java.lang.String,int);
+    public int length();
+    public java.lang.CharSequence subSequence(int,int);
+    public java.lang.String concat(java.lang.String);
+    public java.lang.String replaceAll(java.lang.String,java.lang.String);
+    public java.lang.String replace(char,char);
+    public java.lang.String replaceFirst(java.lang.String,java.lang.String);
+    public java.lang.String[] split(java.lang.String);
+    public java.lang.String[] split(java.lang.String,int);
+    public java.lang.String substring(int);
+    public java.lang.String substring(int,int);
+    public java.lang.String toLowerCase();
+    public java.lang.String toLowerCase(java.util.Locale);
+    public java.lang.String toString();
+    public java.lang.String toUpperCase();
+    public java.lang.String toUpperCase(java.util.Locale);
+    public java.lang.String trim();
+}
+
+# Remove - StringBuffer method calls. Remove all invocations of StringBuffer
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.StringBuffer {
+    public java.lang.String toString();
+    public char charAt(int);
+    public int capacity();
+    public int codePointAt(int);
+    public int codePointBefore(int);
+    public int indexOf(java.lang.String,int);
+    public int lastIndexOf(java.lang.String);
+    public int lastIndexOf(java.lang.String,int);
+    public int length();
+    public java.lang.String substring(int);
+    public java.lang.String substring(int,int);
+}
+
+# Remove - StringBuilder method calls. Remove all invocations of StringBuilder
+# methods without side effects whose return values are not used.
+-assumenosideeffects public class java.lang.StringBuilder {
+    public java.lang.String toString();
+    public char charAt(int);
+    public int capacity();
+    public int codePointAt(int);
+    public int codePointBefore(int);
+    public int indexOf(java.lang.String,int);
+    public int lastIndexOf(java.lang.String);
+    public int lastIndexOf(java.lang.String,int);
+    public int length();
+    public java.lang.String substring(int);
+    public java.lang.String substring(int,int);
+}