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dev.dirs.Util Maven / Gradle / Ivy
package dev.dirs;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.File;
import java.lang.reflect.Method;
import java.nio.charset.Charset;
import java.util.Locale;
final class Util {
private Util() {
throw new Error();
}
static final String operatingSystemName = System.getProperty("os.name");
static final char operatingSystem;
static final char LIN = 'l';
static final char MAC = 'm';
static final char WIN = 'w';
static final char BSD = 'b';
static final char SOLARIS = 's';
static final String UTF8_BOM = "\ufeff";
static {
final String os = operatingSystemName.toLowerCase(Locale.ROOT);
if (os.contains("linux"))
operatingSystem = LIN;
else if (os.contains("mac"))
operatingSystem = MAC;
else if (os.contains("windows"))
operatingSystem = WIN;
else if (os.contains("bsd"))
operatingSystem = BSD;
else if (os.contains("sunos"))
operatingSystem = SOLARIS;
else
throw new UnsupportedOperatingSystemException("directories are not supported on " + operatingSystemName);
}
private static Object base64Encoder = null;
private static Method base64EncodeMethod = null;
// This string needs to end up being a multiple of 3 bytes after conversion to UTF-16. (It is currently 1200 bytes.)
// This is because Base64 converts 3 bytes to 4 letters; other numbers of bytes would introduce padding, which
// would make it harder to simply concatenate this precomputed string with whatever directories the user requests.
static final String SCRIPT_START_BASE64 = operatingSystem == 'w' ? toUTF16LEBase64("& {\n" +
"[Console]::OutputEncoding = [System.Text.Encoding]::UTF8\n" +
"Add-Type @\"\n" +
"using System;\n" +
"using System.Runtime.InteropServices;\n" +
"public class Dir {\n" +
" [DllImport(\"shell32.dll\")]\n" +
" private static extern int SHGetKnownFolderPath([MarshalAs(UnmanagedType.LPStruct)] Guid rfid, uint dwFlags, IntPtr hToken, out IntPtr pszPath);\n" +
" public static string GetKnownFolderPath(string rfid) {\n" +
" IntPtr pszPath;\n" +
" if (SHGetKnownFolderPath(new Guid(rfid), 0, IntPtr.Zero, out pszPath) != 0) return \"\";\n" +
" string path = Marshal.PtrToStringUni(pszPath);\n" +
" Marshal.FreeCoTaskMem(pszPath);\n" +
" return path;\n" +
" }\n" +
"}\n" +
"\"@\n") : null;
static void requireNonNull(Object value) {
if (value == null)
throw new NullPointerException();
}
static boolean isNullOrEmpty(String value) {
return value == null || value.isEmpty();
}
static String defaultIfNullOrEmpty(String value, String fallbackValue, String fallbackArg) {
requireNonNull(fallbackArg);
if (isNullOrEmpty(value))
return ensureSingleSlash(fallbackValue, fallbackArg);
else
return value;
}
static String defaultIfNullOrEmptyExtended(String value, String valueArg, String fallbackValue, String fallbackArg) {
requireNonNull(valueArg);
requireNonNull(fallbackValue);
requireNonNull(fallbackArg);
if (isNullOrEmpty(value))
return ensureSingleSlash(fallbackValue, fallbackArg);
else
return ensureSingleSlash(value, valueArg);
}
static String ensureSingleSlash(String arg1, String arg2) {
boolean arg1Slash = arg1.endsWith("/");
boolean slashArg2 = arg2.startsWith("/");
if (arg1Slash && slashArg2) {
StringBuilder buf = new StringBuilder(arg1.length() + arg2.length() - 1);
buf.append(arg1, 0, arg1.length() - 1).append(arg2);
return buf.toString();
} else if (!arg1Slash && !slashArg2) {
return arg1 + '/' + arg2;
} else {
return arg1 + arg2;
}
}
static String linuxRuntimeDir(String path) {
String runDir = System.getenv("XDG_RUNTIME_DIR");
if (isNullOrEmpty(runDir))
return null;
else if (path == null)
return runDir;
else
return runDir + '/' + path;
}
static String linuxExecutableDir(String homeDir, String dataDir) {
String binDir = System.getenv("XDG_BIN_HOME");
if (isNullOrEmpty(binDir))
return defaultIfNullOrEmptyExtended(dataDir, "/../bin/", homeDir, "/.local/bin/");
else
return binDir;
}
static String[] getXDGUserDirs(String... dirs) {
int dirsLength = dirs.length;
StringBuilder buf = new StringBuilder(dirsLength * 22);
String[] commands = new String[3];
commands[0] = "/bin/sh";
commands[1] = "-c";
for (int i = 0; i < dirsLength; i++) {
buf.append("xdg-user-dir ");
buf.append(dirs[i]);
buf.append(';');
}
commands[2] = buf.toString();
try {
return runCommands(dirsLength, Charset.defaultCharset(), commands);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
static String[] getWinDirs(String... guids) {
int guidsLength = guids.length;
StringBuilder buf = new StringBuilder(guidsLength * 68);
for (int i = 0; i < guidsLength; i++) {
buf.append("[Dir]::GetKnownFolderPath(\"");
buf.append(guids[i]);
buf.append("\")\n");
}
String encodedCommand = SCRIPT_START_BASE64 + toUTF16LEBase64(buf + "}");
String path = System.getenv("Path");
String[] dirs = path == null ? new String[0] : path.split(File.pathSeparator);
if (dirs.length == 0) {
return windowsFallback(guidsLength, encodedCommand);
}
try {
return runWinCommands(guidsLength, dirs, encodedCommand);
} catch (IOException e) {
return windowsFallback(guidsLength, encodedCommand);
}
}
private static String toUTF16LEBase64(String script) {
byte[] scriptInUtf16LEBytes = script.getBytes(Charset.forName("UTF-16LE"));
if (base64EncodeMethod == null) {
initBase64Encoding();
}
try {
return (String) base64EncodeMethod.invoke(base64Encoder, scriptInUtf16LEBytes);
} catch (Exception e) {
throw new RuntimeException("Base64 encoding failed!", e);
}
}
private static void initBase64Encoding() {
try {
base64Encoder = Class.forName("java.util.Base64").getMethod("getEncoder").invoke(null);
base64EncodeMethod = base64Encoder.getClass().getMethod("encodeToString", byte[].class);
} catch (Exception e1) {
try {
base64EncodeMethod = Class.forName("sun.misc.BASE64Encoder").getMethod("encode", byte[].class);
} catch (Exception e2) {
throw new RuntimeException(
"Could not find any viable Base64 encoder! (java.util.Base64 failed with: " + e1.getMessage() + ")", e2);
}
}
}
private static String[] runCommands(int expectedResultLines, Charset charset, String... commands) throws IOException {
final Process process = new ProcessBuilder(commands).start();
String[] results = new String[expectedResultLines];
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream(), charset));
try {
for (int i = 0; i < expectedResultLines; i++) {
String line = reader.readLine();
if (i == 0 && operatingSystem == 'w' && line != null && line.startsWith(UTF8_BOM))
line = line.substring(UTF8_BOM.length());
results[i] = line;
}
return results;
} finally {
process.destroy();
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static String[] runWinCommands(int guidsLength, String[] dirs, String encodedCommand) throws IOException {
// legacy powershell.exe seems to run faster than pwsh.exe so prefer it if available
String[] commands = { "powershell.exe", "pwsh.exe" };
IOException firstException = null;
for (String dir : dirs) {
for (String command : commands) {
File commandFile = new File(dir, command);
if (commandFile.exists()) {
try {
String[] stdout;
// try to run using powershell V2 to bypass constrained language mode
// note that this has been deprecated in new version of Windows
// https://devblogs.microsoft.com/powershell/windows-powershell-2-0-deprecation/
// for some set up, running this requires installation of extra dependency on Windows host
stdout = runCommands(guidsLength, Charset.forName("UTF-8"),
commandFile.toString(),
"-version",
"2",
"-NoProfile",
"-EncodedCommand",
encodedCommand
);
if (stdout[0] != null) return stdout;
// fall-forward to higher version of powershell
stdout = runCommands(guidsLength, Charset.forName("UTF-8"),
commandFile.toString(),
"-NoProfile",
"-EncodedCommand",
encodedCommand
);
return stdout;
} catch (IOException e) {
firstException = firstException == null ? e : firstException;
}
}
}
}
if (firstException != null) {
throw firstException;
}
else throw new IOException("no directories");
}
private static String[] windowsFallback(int guidsLength, String encodedCommand) {
File powerShellBase = new File("C:\\Program Files\\Powershell");
String[] powerShellDirs = powerShellBase.list();
if (powerShellDirs == null) {
powerShellDirs = new String[0];
}
String[] allPowerShellDirs = new String[powerShellDirs.length + 1];
// legacy powershell.exe seems to run faster than pwsh.exe so prefer it if available
String systemRoot = System.getenv("SystemRoot");
if (systemRoot == null) {
systemRoot = "C:\\Windows";
}
allPowerShellDirs[0] = systemRoot + "\\System32\\WindowsPowerShell\\v1.0\\";
for (int i = 0; i < powerShellDirs.length; ++i) {
allPowerShellDirs[i + 1] = new File(powerShellBase, powerShellDirs[i]).toString();
}
try {
return runWinCommands(guidsLength, allPowerShellDirs, encodedCommand);
} catch (final IOException ex) {
throw new RuntimeException("Couldn't find pwsh.exe or powershell.exe on path or in default system locations", ex);
}
}
static String macOSApplicationPath(String qualifier, String organization, String application) {
StringBuilder buf = new StringBuilder(Math.max(stringLength(qualifier) + stringLength(organization) + stringLength(application), 0));
boolean qualPresent = !isNullOrEmpty(qualifier);
boolean orgPresent = !isNullOrEmpty(organization);
boolean appPresent = !isNullOrEmpty(application);
if (qualPresent) {
buf.append(trimLowercaseReplaceWhitespace(qualifier, "-", false));
if (orgPresent || appPresent)
buf.append('.');
}
if (orgPresent) {
buf.append(trimLowercaseReplaceWhitespace(organization, "-", false));
if (appPresent)
buf.append('.');
}
if (appPresent)
buf.append(trimLowercaseReplaceWhitespace(application, "-", false));
return buf.toString();
}
static String windowsApplicationPath(String qualifier, String organization, String application) {
StringBuilder buf = new StringBuilder(Math.max(stringLength(organization) + stringLength(application), 0));
boolean orgPresent = !isNullOrEmpty(organization);
boolean appPresent = !isNullOrEmpty(application);
if (orgPresent) {
buf.append(organization);
if (appPresent)
buf.append('\\');
}
if (appPresent)
buf.append(application);
return buf.toString();
}
static String stripQualification(String value) {
int startingPosition = value.lastIndexOf('.') + 1;
return value.substring(startingPosition);
}
static int stringLength(String value) {
if (value == null)
return -1;
else
return value.length();
}
static String trimLowercaseReplaceWhitespace(String value, String replacement, boolean lowerCase) {
StringBuilder buf = new StringBuilder(value.length());
boolean charsBefore = false;
int codePointCount = value.codePointCount(0, value.length());
boolean replace = !replacement.isEmpty();
for (int index = 0; index < codePointCount; index += 1) {
int codepoint = value.codePointAt(index);
if (codepoint == ' ') {
if (charsBefore && replace && codePointExistsAndNotSpace(value, codePointCount, index + 1)) {
buf.append('-');
charsBefore = false;
}
} else {
buf.appendCodePoint(lowerCase ? Character.toLowerCase(codepoint) : codepoint);
charsBefore = true;
}
}
return buf.toString();
}
private static boolean codePointExistsAndNotSpace(String value, int count, int index) {
return index < count && value.codePointAt(index) != ' ';
}
}
