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/*
* Copyright Debezium Authors.
*
* Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
*/
package io.debezium.operator.api.config;
import static java.util.function.Predicate.not;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
/**
* Convenience wrapper used to build properties-like configuration from arbitrary map
*/
public final class ConfigMapping {
/**
* Represents a key in the configuration
*/
public enum KeyType {
/**
* The key is relative to the current prefix
*/
RELATIVE,
/**
* The key is absolute and will never be prefixed (unless specifically documented),
* including situations when the mapping is put into another mapping
*/
ABSOLUTE;
}
public record Key(String name, KeyType type) {
public static Key rel(String key) {
return new Key(key, KeyType.RELATIVE);
}
public static Key abs(String key) {
return new Key(key, KeyType.ABSOLUTE);
}
public static Key root() {
return new Key(null, null);
}
public Key asAbs() {
return abs(name);
}
public Key asRel() {
return rel(name);
}
@Override
public String toString() {
return name;
}
}
private final Map config;
private final String prefix;
public static ConfigMapping from(Map properties) {
var config = ConfigMapping.empty();
config.putAll(properties);
return config;
}
public static ConfigMapping empty() {
return new ConfigMapping(null);
}
public static ConfigMapping prefixed(String prefix) {
return new ConfigMapping(prefix);
}
public ConfigMapping(String prefix) {
this.config = new HashMap<>();
this.prefix = prefix;
}
/**
* Creates new ConfigMapping, with the same prefix as this one, but sets all keys as absolute
*
* @return new ConfigMapping with all keys as absolute
*/
public ConfigMapping asAbsolute() {
return ConfigMapping.prefixed(prefix).putAllAbs(this);
}
/**
* Creates new ConfigMapping, with the same prefix as this one, but sets all keys as relative
*
* @return new ConfigMapping with all keys as relative
*/
public ConfigMapping asRelative() {
return ConfigMapping.prefixed(prefix).putAllRel(this);
}
public Map getAsMapSimple() {
return config.entrySet()
.stream()
.collect(Collectors.toMap(e -> e.getKey().name(), Map.Entry::getValue));
}
public Map getAsMap() {
return config;
}
public String getAsString() {
return config.entrySet().stream()
.map(e -> e.getKey() + "=" + e.getValue())
.sorted()
.collect(Collectors.joining(System.lineSeparator()));
}
public ConfigMapping rootValue(Object value) {
putInternal(value, Key.root());
return this;
}
public ConfigMapping put(String key, Object value) {
putInternal(value, Key.rel(key));
return this;
}
/**
* Puts the value with the given key as absolute key (that is the key will never be prefixed)
*
* @param key the absolute key to put the value under
* @param value the value to put
* @return this mapping
*/
public ConfigMapping putAbs(String key, Object value) {
putInternal(value, Key.abs(key));
return this;
}
public ConfigMapping putAll(ConfigMappable resource) {
return putAll(resource.asConfiguration());
}
public ConfigMapping putAll(String key, ConfigMappable resource) {
return putAll(key, resource.asConfiguration());
}
public ConfigMapping putAll(ConfigMapping config) {
config.getAsMap().forEach((key, value) -> putInternal(value, key));
return this;
}
public ConfigMapping putAll(String key, ConfigMapping config) {
config.getAsMap().forEach((subKey, value) -> putInternal(value, key, subKey));
return this;
}
public ConfigMapping putAll(Map props) {
props.forEach((key, value) -> putInternal(value, Key.rel(key)));
return this;
}
/**
* Puts all values from the given configuration, but sets all keys as absolute
* @param config the configuration to put
* @return this mapping
*/
public ConfigMapping putAllAbs(ConfigMapping config) {
config.getAsMap().forEach((key, value) -> putInternal(value, key.asAbs()));
return this;
}
/**
* Puts all values from the given configuration, but sets all keys as relative
* @param config the configuration to put
* @return this mapping
*/
public ConfigMapping putAllRel(ConfigMapping config) {
config.getAsMap().forEach((key, value) -> putInternal(value, key.asRel()));
return this;
}
public ConfigMapping putList(String key, List items, String name) {
if (items.isEmpty()) {
return this;
}
record NamedItem(String name, ConfigMappable item) {
}
var named = IntStream.
range(0, items.size())
.mapToObj(i -> new NamedItem(name + i, items.get(i)))
.toList();
named.stream()
.map(NamedItem::name)
.reduce((x, y) -> x + "," + y)
.ifPresent(names -> put(key, names));
named.forEach(item -> putAll(key + "." + item.name, item.item));
return this;
}
public ConfigMapping putMap(String key, Map items) {
items.keySet().stream()
.reduce((x, y) -> String.join(","))
.ifPresent(names -> put(key, names));
items.forEach((name, item) -> putAll(key + "." + name, item));
return this;
}
private void putInternal(Object value, Key key) {
putInternal(value, null, key);
}
private void putInternal(Object value, String key, Key subKey) {
if (value == null) {
return;
}
var combined = prefix(key, subKey);
config.put(combined, String.valueOf(value));
}
private Key prefix(String key, Key subKey) {
if (subKey.type == KeyType.ABSOLUTE) {
return subKey;
}
var combined = Stream.concat(Stream.of(prefix), Stream.of(key, subKey.name))
.filter(Objects::nonNull)
.filter(not(String::isBlank))
.collect(Collectors.joining("."));
return Key.rel(combined);
}
public String md5Sum() {
byte[] digest = new byte[0];
try {
var md = MessageDigest.getInstance("MD5");
digest = md.digest(getAsString().getBytes());
}
catch (NoSuchAlgorithmException e) {
// This will never happen
}
return toHex(digest);
}
private String toHex(byte[] bytes) {
var hex = new StringBuilder();
for (byte b : bytes) {
hex.append(String.format("%02x", b));
}
return hex.toString();
}
@Override
public String toString() {
return config.toString();
}
}
