/**
* Split the password property into file password and user password if necessary, and convert them
* to the internal hash format.
*/
private void convertPasswords() {
char[] password = removePassword();
boolean passwordHash =
removeProperty("PASSWORD_HASH", false); // 如果PASSWORD_HASH参数是true那么不再进行SHA256
// 如果配置了CIPHER，则password包含两部份，用一个空格分开这两部份，第一部份是filePassword，第二部份是userPassword。
// 如果PASSWORD_HASH参数是true那么不再进行SHA256，此时必须使用16进制字符，字符个数是偶数。
// 如果PASSWORD_HASH参数是false，不必是16进制字符，会按SHA256算法进行hash
if (getProperty("CIPHER", null) != null) {
// split password into (filePassword+' '+userPassword)
int space = -1;
for (int i = 0, len = password.length; i < len; i++) {
if (password[i] == ' ') {
space = i;
break;
}
}
if (space < 0) {
throw DbException.get(ErrorCode.WRONG_PASSWORD_FORMAT);
}
char[] np = new char[password.length - space - 1];
char[] filePassword = new char[space];
System.arraycopy(password, space + 1, np, 0, np.length);
System.arraycopy(password, 0, filePassword, 0, space);
Arrays.fill(password, (char) 0);
password = np;
// filePasswordHash用"file"进行hash
fileEncryptionKey = FilePathEncrypt.getPasswordBytes(filePassword);
filePasswordHash = hashPassword(passwordHash, "file", filePassword);
}
// userPasswordHash用用户名进行hash
userPasswordHash = hashPassword(passwordHash, user, password);
}
/**
* Try to open the file.
*
* @param fileName the file name
* @param readOnly whether the file should only be opened in read-only mode, even if the file is
* writable
* @param encryptionKey the encryption key, or null if encryption is not used
*/
public void open(String fileName, boolean readOnly, char[] encryptionKey) {
if (file != null) {
return;
}
if (fileName != null) {
FilePath p = FilePath.get(fileName);
// if no explicit scheme was specified, NIO is used
if (p instanceof FilePathDisk && !fileName.startsWith(p.getScheme() + ":")) {
// ensure the NIO file system is registered
FilePathNio.class.getName();
fileName = "nio:" + fileName;
}
}
this.fileName = fileName;
FilePath f = FilePath.get(fileName);
FilePath parent = f.getParent();
if (parent != null && !parent.exists()) {
throw DataUtils.newIllegalArgumentException("Directory does not exist: {0}", parent);
}
if (f.exists() && !f.canWrite()) {
readOnly = true;
}
this.readOnly = readOnly;
try {
file = f.open(readOnly ? "r" : "rw");
if (encryptionKey != null) {
byte[] key = FilePathEncrypt.getPasswordBytes(encryptionKey);
encryptedFile = file;
file = new FilePathEncrypt.FileEncrypt(fileName, key, file);
}
file = FilePathCache.wrap(file);
try {
if (readOnly) {
fileLock = file.tryLock(0, Long.MAX_VALUE, true);
} else {
fileLock = file.tryLock();
}
} catch (OverlappingFileLockException e) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName, e);
}
if (fileLock == null) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName);
}
fileSize = file.size();
} catch (IOException e) {
throw DataUtils.newIllegalStateException(
DataUtils.ERROR_READING_FAILED, "Could not open file {0}", fileName, e);
}
}