Deprecate KeyValue configuration from Filter and extract it into a config package

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/factory/AddRequestHeadersIfNotPresentGatewayFilterFactory.java

@@ -122,6 +122,11 @@ public Class<KeyValueConfig> getConfigClass() {
 		return KeyValueConfig.class;
 	}
 
+	/**
+	 * @deprecated in favour of
+	 * {@link org.springframework.cloud.gateway.support.config.KeyValueConfig}
+	 */
+	@Deprecated
 	public static class KeyValueConfig {
 
 		private KeyValue[] keyValues;
@@ -136,6 +141,11 @@ public void setKeyValues(KeyValue[] keyValues) {
 
 	}
 
+	/**
+	 * @deprecated in favour of
+	 * {@link org.springframework.cloud.gateway.support.config.KeyValue}
+	 */
+	@Deprecated
 	public static class KeyValue {
 
 		private final String key;

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/support/KeyValueConverter.java

@@ -20,6 +20,11 @@
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.util.StringUtils;
 
+/**
+ * @deprecated in favour of
+ * {@link org.springframework.cloud.gateway.support.config.KeyValueConverter}
+ */
+@Deprecated
 public class KeyValueConverter implements Converter<String, KeyValue> {
 
 	private static final String INVALID_CONFIGURATION_MESSAGE = "Invalid configuration, expected format is: 'key:value'";

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/support/config/KeyValue.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2013-2022 the original author or authors.
+ *
+ * Licensed 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 org.springframework.cloud.gateway.support.config;
+
+import org.springframework.core.style.ToStringCreator;
+
+/**
+ * @author Marta Medio
+ */
+public class KeyValue {
+
+	private final String key;
+
+	private final String value;
+
+	public KeyValue(String key, String value) {
+		this.key = key;
+		this.value = value;
+	}
+
+	public String getKey() {
+		return key;
+	}
+
+	public String getValue() {
+		return value;
+	}
+
+	@Override
+	public String toString() {
+		return new ToStringCreator(this).append("name", key).append("value", value).toString();
+	}
+
+}

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/support/config/KeyValueConfig.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2013-2022 the original author or authors.
+ *
+ * Licensed 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 org.springframework.cloud.gateway.support.config;
+
+/**
+ * Adds a new format of configuration for filters. - Filter: key:value,key1:value1
+ *
+ * @author Marta Medio
+ */
+public class KeyValueConfig {
+
+	private KeyValue[] keyValues;
+
+	public KeyValue[] getKeyValues() {
+		return keyValues;
+	}
+
+	public void setKeyValues(KeyValue[] keyValues) {
+		this.keyValues = keyValues;
+	}
+
+}

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/support/config/KeyValueConverter.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2013-2022 the original author or authors.
+ *
+ * Licensed 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 org.springframework.cloud.gateway.support.config;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.StringUtils;
+
+/**
+ * @author Marta Medio
+ */
+public class KeyValueConverter implements Converter<String, KeyValue> {
+
+	private static final String INVALID_CONFIGURATION_MESSAGE = "Invalid configuration, expected format is: 'key:value'";
+
+	@Override
+	public KeyValue convert(String source) throws IllegalArgumentException {
+		try {
+			String[] split = source.split(":");
+			if (source.contains(":") && StringUtils.hasText(split[0])) {
+				return new KeyValue(split[0], split.length == 1 ? "" : split[1]);
+			}
+			throw new IllegalArgumentException(INVALID_CONFIGURATION_MESSAGE);
+		}
+		catch (ArrayIndexOutOfBoundsException e) {
+			throw new IllegalArgumentException(INVALID_CONFIGURATION_MESSAGE);
+		}
+	}
+
+}