com.aliyun.darabonba.encode.Encoder Maven / Gradle / Ivy
// This file is auto-generated, don't edit it. Thanks.
package com.aliyun.darabonba.encode;
import com.aliyun.tea.*;
import com.aliyun.tea.utils.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.util.Arrays;
public class Encoder {
public final static String ENCODING = "UTF-8";
public static final String HASH_SHA256 = "SHA-256";
public static final String HASH_SM3 = "SM3";
public static final String HMAC_SHA256 = "ACS3-HMAC-SHA256";
public static final String RSA_SHA256 = "ACS3-RSA-SHA256";
public static final String HMAC_SM3 = "ACS3-HMAC-SM3";
/**
* Encode the URL
* @param url string
* @return encoded string
*/
public static String urlEncode(String url) throws UnsupportedEncodingException {
return url != null ? URLEncoder.encode(url, ENCODING) : "";
}
/**
* Special encoding for url params.
* @param raw string
* @return encoded string
*/
public static String percentEncode(String raw) throws UnsupportedEncodingException {
return raw != null ? URLEncoder.encode(raw, ENCODING).replace("+", "%20")
.replace("*", "%2A").replace("%7E", "~") : null;
}
/**
* Encode the partial path of url.
* @param path string
* @return encoded string
*/
public static String pathEncode(String path) throws Exception {
if (StringUtils.isEmpty(path) || "/".equals(path)) {
return path;
}
String[] paths = path.split("/");
StringBuilder sb = new StringBuilder();
for (String s : paths) {
sb.append(percentEncode(s));
sb.append("/");
}
return sb.deleteCharAt(sb.length() - 1).toString();
}
/**
* Hex encode for byte array.
* @param raw byte array
* @return encoded string
*/
public static String hexEncode(byte[] raw) {
if (raw == null) {
return null;
}
StringBuilder sb = new StringBuilder();
for (byte b : raw) {
String hex = Integer.toHexString(b & 0xFF);
if (hex.length() < 2) {
sb.append(0);
}
sb.append(hex);
}
return sb.toString();
}
/**
* Hash the raw data with signatureAlgorithm.
* @param raw hashing data
* @param signatureAlgorithm the autograph method
* @return hashed bytes
*/
public static byte[] hash(byte[] raw, String signatureAlgorithm) throws Exception {
if (signatureAlgorithm == null) {
return null;
}
if (signatureAlgorithm.equals(HMAC_SHA256) || signatureAlgorithm.equals(RSA_SHA256)) {
MessageDigest digest = MessageDigest.getInstance(HASH_SHA256);
return digest.digest(raw);
} else if (signatureAlgorithm.equals(HMAC_SM3)) {
BouncyCastleProvider provider = new BouncyCastleProvider();
MessageDigest digest = MessageDigest.getInstance(HASH_SM3, provider);
return digest.digest(raw);
}
return null;
}
/**
* Base64 encoder for byte array.
* @param raw byte array
* @return encoded string
*/
public static String base64EncodeToString(byte[] raw) throws Exception {
return DaraBase64.RFC4648.encode(raw);
}
/**
* Base64 encoder for string.
* @param src string
* @return dncoded byte array
*/
public static byte[] base64Decode(String src) throws Exception {
return DaraBase64.RFC4648.decode(src);
}
public static class DaraBase64 {
private final byte[] newline;
private final int linemax;
private final boolean isURL;
private final boolean doPadding;
private final boolean isMIME;
private DaraBase64(boolean isURL, boolean isMIME, byte[] newline, int linemax, boolean doPadding) {
this.isURL = isURL;
this.isMIME = isMIME;
this.newline = newline;
this.linemax = linemax;
this.doPadding = doPadding;
}
/**
* This array is a lookup table that translates 6-bit positive integer
* index values into their "Base64 Alphabet" equivalents as specified
* in "Table 1: The Base64 Alphabet" of RFC 2045 (and RFC 4648).
*/
private static final char[] toBase64 = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/**
* It's the lookup table for "URL and Filename safe Base64" as specified
* in Table 2 of the RFC 4648, with the '+' and '/' changed to '-' and
* '_'. This table is used when BASE64_URL is specified.
*/
private static final char[] toBase64URL = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
};
private static final int[] fromBase64 = new int[256];
static {
Arrays.fill(fromBase64, -1);
for (int i = 0; i < toBase64.length; i++)
fromBase64[toBase64[i]] = i;
fromBase64['='] = -2;
}
private static final int[] fromBase64URL = new int[256];
static {
Arrays.fill(fromBase64URL, -1);
for (int i = 0; i < toBase64URL.length; i++)
fromBase64URL[toBase64URL[i]] = i;
fromBase64URL['='] = -2;
}
static final DaraBase64 RFC4648 = new DaraBase64(false, false, null, -1, true);
private int encodeOutLength(int srclen) {
int len = 0;
if (doPadding) {
len = 4 * ((srclen + 2) / 3);
} else {
int n = srclen % 3;
len = 4 * (srclen / 3) + (n == 0 ? 0 : n + 1);
}
if (linemax > 0) // line separators
len += (len - 1) / linemax * newline.length;
return len;
}
public String encode(byte[] src) throws UnsupportedEncodingException {
int len = encodeOutLength(src.length); // dst array size
byte[] dst = new byte[len];
int ret = encode0(src, 0, src.length, dst);
if (ret != dst.length)
return new String(Arrays.copyOf(dst, ret), ENCODING);
return new String(dst, ENCODING);
}
private int encode0(byte[] src, int off, int end, byte[] dst) {
char[] base64 = isURL ? toBase64URL : toBase64;
int sp = off;
int slen = (end - off) / 3 * 3;
int sl = off + slen;
if (linemax > 0 && slen > linemax / 4 * 3)
slen = linemax / 4 * 3;
int dp = 0;
while (sp < sl) {
int sl0 = Math.min(sp + slen, sl);
for (int sp0 = sp, dp0 = dp ; sp0 < sl0; ) {
int bits = (src[sp0++] & 0xff) << 16 |
(src[sp0++] & 0xff) << 8 |
(src[sp0++] & 0xff);
dst[dp0++] = (byte)base64[(bits >>> 18) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 12) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 6) & 0x3f];
dst[dp0++] = (byte)base64[bits & 0x3f];
}
int dlen = (sl0 - sp) / 3 * 4;
dp += dlen;
sp = sl0;
if (dlen == linemax && sp < end) {
for (byte b : newline){
dst[dp++] = b;
}
}
}
if (sp < end) { // 1 or 2 leftover bytes
int b0 = src[sp++] & 0xff;
dst[dp++] = (byte)base64[b0 >> 2];
if (sp == end) {
dst[dp++] = (byte)base64[(b0 << 4) & 0x3f];
if (doPadding) {
dst[dp++] = '=';
dst[dp++] = '=';
}
} else {
int b1 = src[sp++] & 0xff;
dst[dp++] = (byte)base64[(b0 << 4) & 0x3f | (b1 >> 4)];
dst[dp++] = (byte)base64[(b1 << 2) & 0x3f];
if (doPadding) {
dst[dp++] = '=';
}
}
}
return dp;
}
public byte[] decode(String src) throws UnsupportedEncodingException {
return decode(src.getBytes(ENCODING));
}
public byte[] decode(byte[] src) {
byte[] dst = new byte[decodeOutLength(src, 0, src.length)];
int ret = decode0(src, 0, src.length, dst);
if (ret != dst.length) {
dst = Arrays.copyOf(dst, ret);
}
return dst;
}
private int decodeOutLength(byte[] src, int sp, int sl) {
int[] base64 = isURL ? fromBase64URL : fromBase64;
int paddings = 0;
int len = sl - sp;
if (len == 0)
return 0;
if (len < 2) {
if (isMIME && base64[0] == -1)
return 0;
throw new IllegalArgumentException(
"Input byte[] should at least have 2 bytes for base64 bytes");
}
if (isMIME) {
// scan all bytes to fill out all non-alphabet. a performance
// trade-off of pre-scan or Arrays.copyOf
int n = 0;
while (sp < sl) {
int b = src[sp++] & 0xff;
if (b == '=') {
len -= (sl - sp + 1);
break;
}
if ((b = base64[b]) == -1)
n++;
}
len -= n;
} else {
if (src[sl - 1] == '=') {
paddings++;
if (src[sl - 2] == '=')
paddings++;
}
}
if (paddings == 0 && (len & 0x3) != 0)
paddings = 4 - (len & 0x3);
return 3 * ((len + 3) / 4) - paddings;
}
private int decode0(byte[] src, int sp, int sl, byte[] dst) {
int[] base64 = isURL ? fromBase64URL : fromBase64;
int dp = 0;
int bits = 0;
int shiftto = 18; // pos of first byte of 4-byte atom
while (sp < sl) {
int b = src[sp++] & 0xff;
if ((b = base64[b]) < 0) {
if (b == -2) { // padding byte '='
// = shiftto==18 unnecessary padding
// x= shiftto==12 a dangling single x
// x to be handled together with non-padding case
// xx= shiftto==6&&sp==sl missing last =
// xx=y shiftto==6 last is not =
if (shiftto == 6 && (sp == sl || src[sp++] != '=') ||
shiftto == 18) {
throw new IllegalArgumentException(
"Input byte array has wrong 4-byte ending unit");
}
break;
}
if (isMIME) // skip if for rfc2045
continue;
else
throw new IllegalArgumentException(
"Illegal base64 character " +
Integer.toString(src[sp - 1], 16));
}
bits |= (b << shiftto);
shiftto -= 6;
if (shiftto < 0) {
dst[dp++] = (byte)(bits >> 16);
dst[dp++] = (byte)(bits >> 8);
dst[dp++] = (byte)(bits);
shiftto = 18;
bits = 0;
}
}
// reached end of byte array or hit padding '=' characters.
if (shiftto == 6) {
dst[dp++] = (byte)(bits >> 16);
} else if (shiftto == 0) {
dst[dp++] = (byte)(bits >> 16);
dst[dp++] = (byte)(bits >> 8);
} else if (shiftto == 12) {
// dangling single "x", incorrectly encoded.
throw new IllegalArgumentException(
"Last unit does not have enough valid bits");
}
// anything left is invalid, if is not MIME.
// if MIME, ignore all non-base64 character
while (sp < sl) {
if (isMIME && base64[src[sp++]] < 0)
continue;
throw new IllegalArgumentException(
"Input byte array has incorrect ending byte at " + sp);
}
return dp;
}
}
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