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Diffstat (limited to 'src/org/apache/http/client/utils/URLEncodedUtils.java')
-rw-r--r-- | src/org/apache/http/client/utils/URLEncodedUtils.java | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/org/apache/http/client/utils/URLEncodedUtils.java b/src/org/apache/http/client/utils/URLEncodedUtils.java new file mode 100644 index 0000000..8b08f90 --- /dev/null +++ b/src/org/apache/http/client/utils/URLEncodedUtils.java @@ -0,0 +1,191 @@ +/* + * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/client/utils/URLEncodedUtils.java $ + * $Revision: 655107 $ + * $Date: 2008-05-10 08:20:42 -0700 (Sat, 10 May 2008) $ + * ==================================================================== + * 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. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + * + */ + +package org.apache.http.client.utils; + +import java.io.IOException; +import java.io.UnsupportedEncodingException; +import java.net.URI; +import java.net.URLDecoder; +import java.net.URLEncoder; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Scanner; +import org.apache.http.Header; +import org.apache.http.HttpEntity; +import org.apache.http.NameValuePair; +import org.apache.http.message.BasicNameValuePair; +import org.apache.http.protocol.HTTP; +import org.apache.http.util.EntityUtils; + +/** + * A collection of utilities for encoding URLs. + */ +public class URLEncodedUtils { + + public static final String CONTENT_TYPE = "application/x-www-form-urlencoded"; + private static final String PARAMETER_SEPARATOR = "&"; + private static final String NAME_VALUE_SEPARATOR = "="; + + /** + * Returns a list of {@link NameValuePair NameValuePairs} as built from the + * URI's query portion. For example, a URI of + * http://example.org/path/to/file?a=1&b=2&c=3 would return a list of three + * NameValuePairs, one for a=1, one for b=2, and one for c=3. + * <p> + * This is typically useful while parsing an HTTP PUT. + * + * @param uri + * uri to parse + * @param encoding + * encoding to use while parsing the query + */ + public static List <NameValuePair> parse (final URI uri, final String encoding) { + List <NameValuePair> result = Collections.emptyList(); + final String query = uri.getRawQuery(); + if (query != null && query.length() > 0) { + result = new ArrayList <NameValuePair>(); + parse(result, new Scanner(query), encoding); + } + return result; + } + + /** + * Returns a list of {@link NameValuePair NameValuePairs} as parsed from an + * {@link HttpEntity}. The encoding is taken from the entity's + * Content-Encoding header. + * <p> + * This is typically used while parsing an HTTP POST. + * + * @param entity + * The entity to parse + * @throws IOException + * If there was an exception getting the entity's data. + */ + public static List <NameValuePair> parse ( + final HttpEntity entity) throws IOException { + List <NameValuePair> result = Collections.emptyList(); + if (isEncoded(entity)) { + final String content = EntityUtils.toString(entity); + final Header encoding = entity.getContentEncoding(); + if (content != null && content.length() > 0) { + result = new ArrayList <NameValuePair>(); + parse(result, new Scanner(content), + encoding != null ? encoding.getValue() : null); + } + } + return result; + } + + /** + * Returns true if the entity's Content-Type header is + * <code>application/x-www-form-urlencoded</code>. + */ + public static boolean isEncoded (final HttpEntity entity) { + final Header contentType = entity.getContentType(); + return (contentType != null && contentType.getValue().equalsIgnoreCase(CONTENT_TYPE)); + } + + /** + * Adds all parameters within the Scanner to the list of + * <code>parameters</code>, as encoded by <code>encoding</code>. For + * example, a scanner containing the string <code>a=1&b=2&c=3</code> would + * add the {@link NameValuePair NameValuePairs} a=1, b=2, and c=3 to the + * list of parameters. + * + * @param parameters + * List to add parameters to. + * @param scanner + * Input that contains the parameters to parse. + * @param encoding + * Encoding to use when decoding the parameters. + */ + public static void parse ( + final List <NameValuePair> parameters, + final Scanner scanner, + final String encoding) { + scanner.useDelimiter(PARAMETER_SEPARATOR); + while (scanner.hasNext()) { + final String[] nameValue = scanner.next().split(NAME_VALUE_SEPARATOR); + if (nameValue.length == 0 || nameValue.length > 2) + throw new IllegalArgumentException("bad parameter"); + + final String name = decode(nameValue[0], encoding); + String value = null; + if (nameValue.length == 2) + value = decode(nameValue[1], encoding); + parameters.add(new BasicNameValuePair(name, value)); + } + } + + /** + * Returns a String that is suitable for use as an <code>application/x-www-form-urlencoded</code> + * list of parameters in an HTTP PUT or HTTP POST. + * + * @param parameters The parameters to include. + * @param encoding The encoding to use. + */ + public static String format ( + final List <? extends NameValuePair> parameters, + final String encoding) { + final StringBuilder result = new StringBuilder(); + for (final NameValuePair parameter : parameters) { + final String encodedName = encode(parameter.getName(), encoding); + final String value = parameter.getValue(); + final String encodedValue = value != null ? encode(value, encoding) : ""; + if (result.length() > 0) + result.append(PARAMETER_SEPARATOR); + result.append(encodedName); + result.append(NAME_VALUE_SEPARATOR); + result.append(encodedValue); + } + return result.toString(); + } + + private static String decode (final String content, final String encoding) { + try { + return URLDecoder.decode(content, + encoding != null ? encoding : HTTP.DEFAULT_CONTENT_CHARSET); + } catch (UnsupportedEncodingException problem) { + throw new IllegalArgumentException(problem); + } + } + + private static String encode (final String content, final String encoding) { + try { + return URLEncoder.encode(content, + encoding != null ? encoding : HTTP.DEFAULT_CONTENT_CHARSET); + } catch (UnsupportedEncodingException problem) { + throw new IllegalArgumentException(problem); + } + } + +} |