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/* Copyright (c) 2008, 2009 Netflix, Matthias Kaeppler
*
* 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
*
* 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 oauth.signpost;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URLDecoder;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import oauth.signpost.http.HttpParameters;
import com.google.gdata.util.common.base.PercentEscaper;
public class OAuth {
public static final String VERSION_1_0 = "1.0";
public static final String ENCODING = "UTF-8";
public static final String FORM_ENCODED = "application/x-www-form-urlencoded";
public static final String HTTP_AUTHORIZATION_HEADER = "Authorization";
public static final String OAUTH_CONSUMER_KEY = "oauth_consumer_key";
public static final String OAUTH_TOKEN = "oauth_token";
public static final String OAUTH_TOKEN_SECRET = "oauth_token_secret";
public static final String OAUTH_SIGNATURE_METHOD = "oauth_signature_method";
public static final String OAUTH_SIGNATURE = "oauth_signature";
public static final String OAUTH_TIMESTAMP = "oauth_timestamp";
public static final String OAUTH_NONCE = "oauth_nonce";
public static final String OAUTH_VERSION = "oauth_version";
public static final String OAUTH_CALLBACK = "oauth_callback";
public static final String OAUTH_CALLBACK_CONFIRMED = "oauth_callback_confirmed";
public static final String OAUTH_VERIFIER = "oauth_verifier";
/**
* Pass this value as the callback "url" upon retrieving a request token if
* your application cannot receive callbacks (e.g. because it's a desktop
* app). This will tell the service provider that verification happens
* out-of-band, which basically means that it will generate a PIN code (the
* OAuth verifier) and display that to your user. You must obtain this code
* from your user and pass it to
* {@link OAuthProvider#retrieveAccessToken(OAuthConsumer, String)} in order
* to complete the token handshake.
*/
public static final String OUT_OF_BAND = "oob";
private static final PercentEscaper percentEncoder = new PercentEscaper(
"-._~", false);
public static String percentEncode(String s) {
if (s == null) {
return "";
}
return percentEncoder.escape(s);
}
public static String percentDecode(String s) {
try {
if (s == null) {
return "";
}
return URLDecoder.decode(s, ENCODING);
// This implements http://oauth.pbwiki.com/FlexibleDecoding
} catch (java.io.UnsupportedEncodingException wow) {
throw new RuntimeException(wow.getMessage(), wow);
}
}
/**
* Construct a x-www-form-urlencoded document containing the given sequence
* of name/value pairs. Use OAuth percent encoding (not exactly the encoding
* mandated by x-www-form-urlencoded).
*/
public static > void formEncode(Collection parameters,
OutputStream into) throws IOException {
if (parameters != null) {
boolean first = true;
for (Map.Entry entry : parameters) {
if (first) {
first = false;
} else {
into.write('&');
}
into.write(percentEncode(safeToString(entry.getKey())).getBytes());
into.write('=');
into.write(percentEncode(safeToString(entry.getValue())).getBytes());
}
}
}
/**
* Construct a x-www-form-urlencoded document containing the given sequence
* of name/value pairs. Use OAuth percent encoding (not exactly the encoding
* mandated by x-www-form-urlencoded).
*/
public static > String formEncode(Collection parameters)
throws IOException {
ByteArrayOutputStream b = new ByteArrayOutputStream();
formEncode(parameters, b);
return new String(b.toByteArray());
}
/** Parse a form-urlencoded document. */
public static HttpParameters decodeForm(String form) {
HttpParameters params = new HttpParameters();
if (isEmpty(form)) {
return params;
}
for (String nvp : form.split("\\&")) {
int equals = nvp.indexOf('=');
String name;
String value;
if (equals < 0) {
name = percentDecode(nvp);
value = null;
} else {
name = percentDecode(nvp.substring(0, equals));
value = percentDecode(nvp.substring(equals + 1));
}
params.put(name, value);
}
return params;
}
public static HttpParameters decodeForm(InputStream content)
throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(
content));
StringBuilder sb = new StringBuilder();
String line = reader.readLine();
while (line != null) {
sb.append(line);
line = reader.readLine();
}
return decodeForm(sb.toString());
}
/**
* Construct a Map containing a copy of the given parameters. If several
* parameters have the same name, the Map will contain the first value,
* only.
*/
public static > Map toMap(Collection from) {
HashMap map = new HashMap();
if (from != null) {
for (Map.Entry entry : from) {
String key = entry.getKey();
if (!map.containsKey(key)) {
map.put(key, entry.getValue());
}
}
}
return map;
}
public static final String safeToString(Object from) {
return (from == null) ? null : from.toString();
}
public static boolean isEmpty(String str) {
return (str == null) || (str.length() == 0);
}
/**
* Appends a list of key/value pairs to the given URL, e.g.:
*
*
*
* All parameters will be encoded according to OAuth's percent encoding
* rules.
*
* @param url
* the URL
* @param kvPairs
* the list of key/value pairs
* @return
*/
public static String addQueryParameters(String url, String... kvPairs) {
String queryDelim = url.contains("?") ? "&" : "?";
StringBuilder sb = new StringBuilder(url + queryDelim);
for (int i = 0; i < kvPairs.length; i += 2) {
if (i > 0) {
sb.append("&");
}
sb.append(OAuth.percentEncode(kvPairs[i]) + "="
+ OAuth.percentEncode(kvPairs[i + 1]));
}
return sb.toString();
}
public static String addQueryParameters(String url, Map params) {
String[] kvPairs = new String[params.size() * 2];
int idx = 0;
for (String key : params.keySet()) {
kvPairs[idx] = key;
kvPairs[idx + 1] = params.get(key);
idx += 2;
}
return addQueryParameters(url, kvPairs);
}
/**
* Builds an OAuth header from the given list of header fields. All
* parameters starting in 'oauth_*' will be percent encoded.
*
*
*
* @param kvPairs
* the list of key/value pairs
* @return a string eligible to be used as an OAuth HTTP Authorization
* header.
*/
public static String prepareOAuthHeader(String... kvPairs) {
StringBuilder sb = new StringBuilder("OAuth ");
for (int i = 0; i < kvPairs.length; i += 2) {
if (i > 0) {
sb.append(", ");
}
String value = kvPairs[i].startsWith("oauth_") ? OAuth
.percentEncode(kvPairs[i + 1]) : kvPairs[i + 1];
sb.append(OAuth.percentEncode(kvPairs[i]) + "=\"" + value + "\"");
}
return sb.toString();
}
public static HttpParameters oauthHeaderToParamsMap(String oauthHeader) {
HttpParameters params = new HttpParameters();
if (oauthHeader == null || !oauthHeader.startsWith("OAuth ")) {
return params;
}
oauthHeader = oauthHeader.substring("OAuth ".length());
String[] elements = oauthHeader.split(",");
for (String keyValuePair : elements) {
String[] keyValue = keyValuePair.split("=");
params.put(keyValue[0].trim(), keyValue[1].replace("\"", "").trim());
}
return params;
}
/**
* Helper method to concatenate a parameter and its value to a pair that can
* be used in an HTTP header. This method percent encodes both parts before
* joining them.
*
* @param name
* the OAuth parameter name, e.g. oauth_token
* @param value
* the OAuth parameter value, e.g. 'hello oauth'
* @return a name/value pair, e.g. oauth_token="hello%20oauth"
*/
public static String toHeaderElement(String name, String value) {
return OAuth.percentEncode(name) + "=\"" + OAuth.percentEncode(value) + "\"";
}
public static void debugOut(String key, String value) {
if (System.getProperty("debug") != null) {
System.out.println("[SIGNPOST] " + key + ": " + value);
}
}
}
