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PayPal SDK for integrating with the REST APIs
package com.paypal.base.rest;
import com.paypal.api.openidconnect.CreateFromAuthorizationCodeParameters;
import com.paypal.api.openidconnect.CreateFromRefreshTokenParameters;
import com.paypal.api.openidconnect.UserinfoParameters;
import com.paypal.base.Constants;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
/**
* RESTUtil acts as utility class used by REST API system
*/
public final class RESTUtil {
private RESTUtil() {
}
/**
* Formats the URI path for REST calls.
*
* @param pattern
* URI pattern with place holders for replacement strings
* @param parameters
* Replacement objects
* @return Formatted URI path
*/
public static String formatURIPath(String pattern, Object[] parameters) {
String formattedPath = null;
Object[] finalParameters = null;
if (pattern != null) {
if (parameters != null
&& parameters.length == 1
&& parameters[0] instanceof CreateFromAuthorizationCodeParameters) {
// Form a object array using the passed
// CreateFromAuthorizationCodeParameters
finalParameters = splitParameters(pattern,
((CreateFromAuthorizationCodeParameters) parameters[0])
.getContainerMap());
} else if (parameters != null
&& parameters.length == 1
&& parameters[0] instanceof CreateFromRefreshTokenParameters) {
// Form a object array using the passed
// CreateFromRefreshTokenParameters
finalParameters = splitParameters(pattern,
((CreateFromRefreshTokenParameters) parameters[0])
.getContainerMap());
} else if (parameters != null && parameters.length == 1
&& parameters[0] instanceof UserinfoParameters) {
// Form a object array using the passed UserinfoParameters
finalParameters = splitParameters(pattern,
((UserinfoParameters) parameters[0]).getContainerMap());
} else if (parameters != null && parameters.length == 1
&& parameters[0] instanceof QueryParameters) {
// Form a object array using the passed UserinfoParameters
finalParameters = splitParameters(pattern,
((QueryParameters) parameters[0]).getContainerMap());
} else if (parameters != null && parameters.length == 1
&& parameters[0] instanceof Map) {
// Form a object array using the passed Map
finalParameters = splitParameters(pattern,
((Map) parameters[0]));
} else {
finalParameters = parameters;
}
// Perform a simple message formatting
String fString = MessageFormat.format(pattern, finalParameters);
// Process the resultant string for removing nulls
formattedPath = removeNullsInQS(fString);
}
return formattedPath;
}
/**
* Formats the URI path for REST calls. Replaces any occurrences of the form
* {name} in pattern with the corresponding value of key name in the passes
* {@link Map}
*
* @param pattern
* URI pattern with named place holders
* @param pathParameters
* Parameter {@link Map}
* @return Processed URI path
* @throws PayPalRESTException
*/
public static String formatURIPath(String pattern,
Map pathParameters) throws PayPalRESTException {
return formatURIPath(pattern, pathParameters, new HashMap());
}
/**
* Formats the URI path for REST calls. Replaces any occurrences of the form
* {name} in pattern with the corresponding value of key name in the passes
* {@link Map}. Query parameters are appended to the end of the URI path
*
* @param pattern
* URI pattern with named place holders
* @param queryParameters
* Query parameters {@link Map}
* @param pathParameters
* Parameter {@link String...}
* @return Processed URI path
* @throws PayPalRESTException
*/
public static String formatURIPath(String pattern, Map queryParameters, String... pathParameters)
throws PayPalRESTException {
Map pathParams = new HashMap();
if (pathParameters != null) {
for (int i = 0; i < pathParameters.length; i++) {
pathParams.put(String.valueOf(i), pathParameters[i]);
}
}
return formatURIPath(pattern, pathParams, queryParameters);
}
/**
* Formats the URI path for REST calls. Replaces any occurrences of the form
* {name} in pattern with the corresponding value of key name in the passes
* {@link Map}. Query parameters are appended to the end of the URI path
*
* @param pattern
* URI pattern with named place holders
* @param pathParameters
* Parameter {@link Map}
* @param queryParameters
* Query parameters {@link Map}
* @return Processed URI path
* @throws PayPalRESTException
*/
public static String formatURIPath(String pattern,
Map pathParameters,
Map queryParameters) throws PayPalRESTException {
String formattedURIPath = null;
if (pattern != null && pattern.trim().length() > 0
&& pathParameters != null && pathParameters.size() > 0) {
for (Entry entry : pathParameters.entrySet()) {
String placeHolderName = "{" + entry.getKey().trim() + "}";
if (pattern.contains(placeHolderName)) {
pattern = pattern.replace(placeHolderName, entry.getValue()
.trim());
}
}
}
formattedURIPath = pattern;
if (queryParameters != null && queryParameters.size() > 0) {
StringBuilder stringBuilder = new StringBuilder(formattedURIPath);
if (stringBuilder.toString().contains("?")) {
if (!(stringBuilder.toString().endsWith("?")
|| stringBuilder.toString().endsWith("&"))) {
stringBuilder.append("&");
}
} else {
stringBuilder.append("?");
}
for (Entry entry : queryParameters.entrySet()) {
try {
stringBuilder
.append(URLEncoder.encode(entry.getKey(), "UTF-8"))
.append("=")
.append(URLEncoder.encode(entry.getValue(), "UTF-8"))
.append("&");
} catch (UnsupportedEncodingException e) {
// TODO
}
}
formattedURIPath = stringBuilder.toString();
}
if (formattedURIPath.contains("{") || formattedURIPath.contains("}")) {
throw new PayPalRESTException("Unable to formatURI Path : "
+ formattedURIPath
+ ", unable to replace placeholders with the map : "
+ pathParameters);
}
return formattedURIPath;
}
/**
* Remove null parameters from query string
*
* @param fString
* Formatted String
* @return Nulls removed query string
*/
private static String removeNullsInQS(String fString) {
String formattedString = fString;
if (fString != null && fString.length() != 0) {
String[] parts = fString.split("\\?");
// Process the query string part
if (parts.length == 2) {
String queryString = parts[1];
String[] querys = queryString.split("&");
if (querys.length > 0) {
StringBuilder strBuilder = new StringBuilder();
for (String query : querys) {
String[] valueSplit = query.split("=");
if (valueSplit.length == 2) {
if ("null".equalsIgnoreCase(valueSplit[1].trim())) {
continue;
} else if ("".equals(valueSplit[1].trim())) {
continue;
} else {
strBuilder.append(query).append("&");
}
} else if (valueSplit.length < 2) {
continue;
}
}
formattedString = (!strBuilder.toString().endsWith("&")) ? strBuilder
.toString() : strBuilder.toString().substring(0,
strBuilder.toString().length() - 1);
}
// append the query string delimiter
formattedString = (parts[0].trim() + "?") + formattedString;
}
}
return formattedString;
}
/**
* Split the URI and form a Object array using the query string and values
* in the provided map. The return object array is populated only if the map
* contains valid value for the query name. The object array contains null
* values if there is no value found in the map
*
* @param pattern
* URI pattern
* @param containerMap
* Map containing the query name and value
* @return Object array
*/
private static Object[] splitParameters(String pattern,
Map containerMap) {
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