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Highly-available version-controlled service configuration repository based on Git, ZooKeeper and HTTP/2 (centraldogma-common)
/*
* Copyright 2017 LINE Corporation
*
* LINE Corporation licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package com.linecorp.centraldogma.internal;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.jayway.jsonpath.JsonPath;
/**
* This class borrowed some of its methods from a NetUtil class which was part of Netty project.
*/
public final class Util {
private static final Pattern FILE_NAME_PATTERN = Pattern.compile(
"^(?:[-_0-9a-zA-Z](?:[-_.0-9a-zA-Z]*[-_0-9a-zA-Z])?)+$");
private static final Pattern FILE_PATH_PATTERN = Pattern.compile(
"^(?:/[-_0-9a-zA-Z](?:[-_.0-9a-zA-Z]*[-_0-9a-zA-Z])?)+$");
private static final Pattern JSON_FILE_PATH_PATTERN = Pattern.compile(
"^(?:/[-_0-9a-zA-Z](?:[-_.0-9a-zA-Z]*[-_0-9a-zA-Z])?)+\\.(?i)json$");
private static final Pattern DIR_PATH_PATTERN = Pattern.compile(
"^(?:/[-_0-9a-zA-Z](?:[-_.0-9a-zA-Z]*[-_0-9a-zA-Z])?)*/?$");
private static final Pattern PATH_PATTERN_PATTERN = Pattern.compile("^[- /*_.,0-9a-zA-Z]+$");
private static final Pattern EMAIL_PATTERN = Pattern.compile(
"^[_A-Za-z0-9-+]+(?:\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(?:\\.[A-Za-z0-9]+)*(?:\\.[A-Za-z]{2,})$");
private static final Pattern GENERAL_EMAIL_PATTERN = Pattern.compile(
"^[_A-Za-z0-9-+]+(?:\\.[_A-Za-z0-9-]+)*@(.+)$");
/**
* Start with an alphanumeric character.
* An alphanumeric character, minus, plus, underscore and dot are allowed in the middle.
* End with an alphanumeric character.
*/
private static final Pattern PROJECT_AND_REPO_NAME_PATTERN =
Pattern.compile("^[0-9A-Za-z](?:[-+_0-9A-Za-z.]*[0-9A-Za-z])?$");
public static String validateFileName(String name, String paramName) {
requireNonNull(name, paramName);
checkArgument(isValidFileName(name),
"%s: %s (expected: %s)", paramName, name, FILE_NAME_PATTERN);
return name;
}
public static boolean isValidFileName(String name) {
requireNonNull(name, "name");
return !name.isEmpty() && FILE_NAME_PATTERN.matcher(name).matches();
}
public static String validateFilePath(String path, String paramName) {
requireNonNull(path, paramName);
checkArgument(isValidFilePath(path),
"%s: %s (expected: %s)", paramName, path, FILE_PATH_PATTERN);
return path;
}
public static boolean isValidFilePath(String path) {
requireNonNull(path, "path");
return !path.isEmpty() && path.charAt(0) == '/' &&
FILE_PATH_PATTERN.matcher(path).matches();
}
public static String validateJsonFilePath(String path, String paramName) {
requireNonNull(path, paramName);
checkArgument(isValidJsonFilePath(path),
"%s: %s (expected: %s)", paramName, path, JSON_FILE_PATH_PATTERN);
return path;
}
public static boolean isValidJsonFilePath(String path) {
requireNonNull(path, "path");
return !path.isEmpty() && path.charAt(0) == '/' &&
JSON_FILE_PATH_PATTERN.matcher(path).matches();
}
public static String validateJsonPath(String jsonPath, String paramName) {
requireNonNull(jsonPath, paramName);
checkArgument(isValidJsonPath(jsonPath),
"%s: %s (expected: a valid JSON path)", paramName, jsonPath);
return jsonPath;
}
public static boolean isValidJsonPath(String jsonPath) {
try {
JsonPath.compile(jsonPath);
return true;
} catch (Exception e) {
return false;
}
}
public static String validateDirPath(String path, String paramName) {
requireNonNull(path, paramName);
checkArgument(isValidDirPath(path),
"%s: %s (expected: %s)", paramName, path, DIR_PATH_PATTERN);
return path;
}
public static boolean isValidDirPath(String path) {
return isValidDirPath(path, false);
}
public static boolean isValidDirPath(String path, boolean mustEndWithSlash) {
requireNonNull(path);
if (mustEndWithSlash && !path.endsWith("/")) {
return false;
}
return !path.isEmpty() && path.charAt(0) == '/' &&
DIR_PATH_PATTERN.matcher(path).matches();
}
public static String validatePathPattern(String pathPattern, String paramName) {
requireNonNull(pathPattern, paramName);
checkArgument(isValidPathPattern(pathPattern),
"%s: %s (expected: %s)", paramName, pathPattern, PATH_PATTERN_PATTERN);
return pathPattern;
}
public static boolean isValidPathPattern(String pathPattern) {
requireNonNull(pathPattern, "pathPattern");
return PATH_PATTERN_PATTERN.matcher(pathPattern).matches();
}
public static String validateProjectName(String projectName, String paramName) {
requireNonNull(projectName, paramName);
checkArgument(isValidProjectName(projectName),
"%s: %s (expected: %s)", paramName, projectName, PROJECT_AND_REPO_NAME_PATTERN);
return projectName;
}
public static boolean isValidProjectName(String projectName) {
requireNonNull(projectName, "projectName");
return PROJECT_AND_REPO_NAME_PATTERN.matcher(projectName).matches();
}
public static String validateRepositoryName(String repoName, String paramName) {
requireNonNull(repoName, paramName);
checkArgument(isValidRepositoryName(repoName),
"%s: %s (expected: %s)", paramName, repoName, PROJECT_AND_REPO_NAME_PATTERN);
return repoName;
}
public static boolean isValidRepositoryName(String repoName) {
requireNonNull(repoName, "repoName");
return PROJECT_AND_REPO_NAME_PATTERN.matcher(repoName).matches();
}
public static String validateEmailAddress(String emailAddr, String paramName) {
requireNonNull(emailAddr, paramName);
checkArgument(isValidEmailAddress(emailAddr),
"%s: %s (expected: a valid e-mail address)", paramName, emailAddr);
return emailAddr;
}
public static boolean isValidEmailAddress(String emailAddr) {
requireNonNull(emailAddr, "emailAddr");
if (EMAIL_PATTERN.matcher(emailAddr).matches()) {
return true;
}
// Try to check whether the domain part is IP address format.
final Matcher m = GENERAL_EMAIL_PATTERN.matcher(emailAddr);
if (m.matches()) {
final String domainPart = m.group(1);
return isValidIpV4Address(domainPart) ||
isValidIpV6Address(domainPart);
}
return false;
}
public static String toEmailAddress(String emailAddr, String paramName) {
requireNonNull(emailAddr, paramName);
if (isValidEmailAddress(emailAddr)) {
return emailAddr;
}
return emailAddr + "@localhost.localdomain";
}
public static String emailToUsername(String emailAddr, String paramName) {
validateEmailAddress(emailAddr, paramName);
return emailAddr.substring(0, emailAddr.indexOf('@'));
}
public static List stringToLines(String str) {
final BufferedReader reader = new BufferedReader(new StringReader(str));
final List lines = new ArrayList<>(128);
try {
String line;
while ((line = reader.readLine()) != null) {
lines.add(line);
}
} catch (IOException ignored) {
// Should never happen.
}
return lines;
}
/**
* Returns the simplified name of the type of the specified object.
*/
public static String simpleTypeName(Object obj) {
if (obj == null) {
return "null";
}
return simpleTypeName(obj.getClass(), false);
}
/**
* Returns the simplified name of the specified type.
*/
public static String simpleTypeName(Class clazz) {
return simpleTypeName(clazz, false);
}
/**
* Returns the simplified and (optionally) decapitalized name of the specified type.
*/
public static String simpleTypeName(Class clazz, boolean decapitalize) {
if (clazz == null) {
return "null";
}
String className = clazz.getName();
final int lastDotIdx = className.lastIndexOf('.');
if (lastDotIdx >= 0) {
className = className.substring(lastDotIdx + 1);
}
if (!decapitalize) {
return className;
}
final StringBuilder buf = new StringBuilder(className.length());
boolean lowercase = true;
for (int i = 0; i < className.length(); i++) {
final char c1 = className.charAt(i);
final char c2;
if (lowercase) {
c2 = Character.toLowerCase(c1);
if (c1 == c2) {
lowercase = false;
}
} else {
c2 = c1;
}
buf.append(c2);
}
return buf.toString();
}
/**
* Casts an object unsafely. Used when you want to suppress the unchecked type warnings.
*/
@SuppressWarnings("unchecked")
public static T unsafeCast(Object o) {
return (T) o;
}
/**
* Makes sure the specified {@code values} and all its elements are not {@code null}.
*/
public static Iterable requireNonNullElements(Iterable values, String name) {
requireNonNull(values, name);
int i = 0;
for (T v : values) {
if (v == null) {
throw new NullPointerException(name + '[' + i + ']');
}
i++;
}
return values;
}
private static boolean isValidIpV4Address(String ip) {
return isValidIpV4Address(ip, 0, ip.length());
}
@SuppressWarnings("DuplicateBooleanBranch")
private static boolean isValidIpV4Address(String ip, int from, int toExcluded) {
final int len = toExcluded - from;
int i;
return len <= 15 && len >= 7 &&
(i = ip.indexOf('.', from + 1)) > 0 && isValidIpV4Word(ip, from, i) &&
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
isValidIpV4Word(ip, i + 1, toExcluded);
}
private static boolean isValidIpV4Word(CharSequence word, int from, int toExclusive) {
final int len = toExclusive - from;
final char c0;
final char c1;
final char c2;
if (len < 1 || len > 3 || (c0 = word.charAt(from)) < '0') {
return false;
}
if (len == 3) {
return (c1 = word.charAt(from + 1)) >= '0' &&
(c2 = word.charAt(from + 2)) >= '0' &&
(c0 <= '1' && c1 <= '9' && c2 <= '9' ||
c0 == '2' && c1 <= '5' && (c2 <= '5' || c1 < '5' && c2 <= '9'));
}
return c0 <= '9' && (len == 1 || isValidNumericChar(word.charAt(from + 1)));
}
private static boolean isValidIpV6Address(String ip) {
int end = ip.length();
if (end < 2) {
return false;
}
// strip "[]"
int start;
char c = ip.charAt(0);
if (c == '[') {
end--;
if (ip.charAt(end) != ']') {
// must have a close ]
return false;
}
start = 1;
c = ip.charAt(1);
} else {
start = 0;
}
int colons;
int compressBegin;
if (c == ':') {
// an IPv6 address can start with "::" or with a number
if (ip.charAt(start + 1) != ':') {
return false;
}
colons = 2;
compressBegin = start;
start += 2;
} else {
colons = 0;
compressBegin = -1;
}
int wordLen = 0;
loop:
for (int i = start; i < end; i++) {
c = ip.charAt(i);
if (isValidHexChar(c)) {
if (wordLen < 4) {
wordLen++;
continue;
}
return false;
}
switch (c) {
case ':':
if (colons > 7) {
return false;
}
if (ip.charAt(i - 1) == ':') {
if (compressBegin >= 0) {
return false;
}
compressBegin = i - 1;
} else {
wordLen = 0;
}
colons++;
break;
case '.':
// case for the last 32-bits represented as IPv4 x:x:x:x:x:x:d.d.d.d
// check a normal case (6 single colons)
if (compressBegin < 0 && colons != 6 ||
// a special case ::1:2:3:4:5:d.d.d.d allows 7 colons with an
// IPv4 ending, otherwise 7 :'s is bad
colons == 7 && compressBegin >= start || colons > 7) {
return false;
}
// Verify this address is of the correct structure to contain an IPv4 address.
// It must be IPv4-Mapped or IPv4-Compatible
// (see https://tools.ietf.org/html/rfc4291#section-2.5.5).
final int ipv4Start = i - wordLen;
int j = ipv4Start - 2; // index of character before the previous ':'.
if (isValidIPv4MappedChar(ip.charAt(j))) {
if (!isValidIPv4MappedChar(ip.charAt(j - 1)) ||
!isValidIPv4MappedChar(ip.charAt(j - 2)) ||
!isValidIPv4MappedChar(ip.charAt(j - 3))) {
return false;
}
j -= 5;
}
for (; j >= start; --j) {
final char tmpChar = ip.charAt(j);
if (tmpChar != '0' && tmpChar != ':') {
return false;
}
}
// 7 - is minimum IPv4 address length
int ipv4End = ip.indexOf('%', ipv4Start + 7);
if (ipv4End < 0) {
ipv4End = end;
}
return isValidIpV4Address(ip, ipv4Start, ipv4End);
case '%':
// strip the interface name/index after the percent sign
end = i;
break loop;
default:
return false;
}
}
// normal case without compression
if (compressBegin < 0) {
return colons == 7 && wordLen > 0;
}
return compressBegin + 2 == end ||
// 8 colons is valid only if compression in start or end
wordLen > 0 && (colons < 8 || compressBegin <= start);
}
private static boolean isValidNumericChar(char c) {
return c >= '0' && c <= '9';
}
private static boolean isValidIPv4MappedChar(char c) {
return c == 'f' || c == 'F';
}
private static boolean isValidHexChar(char c) {
return c >= '0' && c <= '9' || c >= 'A' && c <= 'F' || c >= 'a' && c <= 'f';
}
/**
* Deletes the specified {@code directory} recursively.
*/
public static void deleteFileTree(File directory) throws IOException {
if (directory.exists()) {
Files.walkFileTree(directory.toPath(), DeletingFileVisitor.INSTANCE);
}
}
private Util() {}
}