MOONSakura0614 commented on code in PR #11023: URL: https://github.com/apache/inlong/pull/11023#discussion_r1746604974
########## inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/ParseUrlFunction.java: ########## @@ -0,0 +1,153 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF 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 + * + * http://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.apache.inlong.sdk.transform.process.function; + +import org.apache.inlong.sdk.transform.decode.SourceData; +import org.apache.inlong.sdk.transform.process.Context; +import org.apache.inlong.sdk.transform.process.operator.OperatorTools; +import org.apache.inlong.sdk.transform.process.parser.ValueParser; + +import net.sf.jsqlparser.expression.Expression; +import net.sf.jsqlparser.expression.Function; + +import java.net.MalformedURLException; +import java.net.URL; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +/** + * ParseUrlFunction + * description: Returns the specified part from the URL. Valid values for string2 + * include ‘HOST’, ‘PATH’, ‘QUERY’, ‘REF’, ‘PROTOCOL’, ‘AUTHORITY’, ‘FILE’, and ‘USERINFO’. + * Returns NULL if any of arguments is NULL. + * Also a value of a particular key in QUERY can be extracted by providing the key as the third argument string3. + */ +@TransformFunction(names = {"parse_url"}) +public class ParseUrlFunction implements ValueParser { + + private ValueParser urlParser; + private ValueParser partParser; + private ValueParser keyParser; + + public ParseUrlFunction(Function expr) { + List<Expression> params = expr.getParameters().getExpressions(); + urlParser = OperatorTools.buildParser(params.get(0)); + partParser = params.size() > 1 ? OperatorTools.buildParser(params.get(1)) : null; + keyParser = params.size() > 2 ? OperatorTools.buildParser(params.get(2)) : null; + } + + @Override + public Object parse(SourceData sourceData, int rowIndex, Context context) { + if (urlParser == null || partParser == null) { + return null; + } + Object urlObj = urlParser.parse(sourceData, rowIndex, context); + Object partObj = partParser.parse(sourceData, rowIndex, context); + Object keyObj = keyParser != null ? keyParser.parse(sourceData, rowIndex, context) : null; + + if (urlObj == null || partObj == null) { + return null; + } + + String url = OperatorTools.parseString(urlObj); + String part = OperatorTools.parseString(partObj); + String key = keyObj != null ? OperatorTools.parseString(keyObj) : null; + if (keyParser != null && key == null) { + return null; + } + + try { + URL netUrl = new URL(url); + Map<String, String> queryPairs = splitQuery(netUrl.getQuery()); + if ("QUERY".equals(part)) { + if (key != null && queryPairs.containsKey(key)) { + return queryPairs.get(key); + } + return netUrl.getQuery(); + } else { + switch (part) { + case "HOST": + return netUrl.getHost(); + case "PATH": + return netUrl.getPath(); + case "REF": + return netUrl.getRef(); + case "PROTOCOL": + return netUrl.getProtocol(); + case "AUTHORITY": + return netUrl.getAuthority(); + case "FILE": + return netUrl.getFile(); + case "USERINFO": + return netUrl.getUserInfo(); + default: + return null; + } + } + } catch (MalformedURLException e) { + return null; + } + } + + /** + * splitQuery + * @param query + * @return java.util.Map<java.lang.String,java.lang.String> + * @Description: Since Java 8 lacks URI decoding support available in Java 10+, URLDecoder.decode() cannot be used. + * Therefore, a manual decoding method is implemented to extract query parameters. + **/ + private Map<String, String> splitQuery(String query) { + Map<String, String> queryPairs = new HashMap<>(); + if (query != null) { + String[] pairs = query.split("&"); + for (String pair : pairs) { + int idx = pair.indexOf("="); + if (idx != -1) { // skip if no "=" is found + queryPairs.put(manualDecode(pair.substring(0, idx)), manualDecode(pair.substring(idx + 1))); + } + } + } + return queryPairs; + } + + private String manualDecode(String s) { Review Comment: It is not quite the same, but the idea is similar, it traverses the string to determine the special characters, but the manualDecode method is a simplified implementation, only focusing on % and not converting '+' to '=', etc., without considering all edge cases and the complexity of character sets. -- This is an automated message from the Apache Git Service. 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