com.google.gdata.client.authn.oauth

Class OAuthUtil

java.lang.Object

com.google.gdata.client.authn.oauth.OAuthUtil

public class OAuthUtil
extends Object

A general container for methods related to OAuth.

Method Summary

Methods

Modifier and Type	Method and Description
static String	encode(String stringToEncode) Formats the input string for inclusion in a url.
static String	getNonce() Get a nonce for an OAuth request.
static String	getSignatureBaseString(String requestUrl, String httpMethod, Map<String,String> baseParameters) Calculates the signature base url as per section 9.1 of the OAuth Spec.
static String	getTimestamp() Get a timestamp for an OAuth request.
static String	normalizeParameters(String requestUrl, Map<String,String> requestParameters) Calculates the normalized request parameters string to use in the base string, as per section 9.1.1 of the OAuth Spec.
static String	normalizeUrl(String requestUrl) Calculates the normalized request url, as per section 9.1.2 of the OAuth Spec.
static Map<String,String>	parseQuerystring(String queryString) Parse a querystring into a map of key/value pairs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getNonce

public static String getNonce()

Get a nonce for an OAuth request. OAuth defines the nonce as "a random string, uniquely generated for each request. The nonce allows the Service Provider to verify that a request has never been made before and helps prevent replay attacks when requests are made over a non-secure channel (such as HTTP)."

Returns:

the nonce string to use in an OAuth request

getTimestamp

public static String getTimestamp()

Get a timestamp for an OAuth request. OAuth defines the timestamp as "the number of seconds since January 1, 1970 00:00:00 GMT. The timestamp value MUST be a positive integer and MUST be equal or greater than the timestamp used in previous requests."

Returns:

the timestamp string to use in an OAuth request.

getSignatureBaseString

public static String getSignatureBaseString(String requestUrl,
                            String httpMethod,
                            Map<String,String> baseParameters)
                                     throws OAuthException

Calculates the signature base url as per section 9.1 of the OAuth Spec. This is a concatenation of http method, request url, and other request parameters.

Parameters:

requestUrl - the url of the request

httpMethod - the http method, for example "GET" or "PUT"

baseParameters - the request parameters (see section 9.1.3)

Returns:

the base string to be used in the OAuth signature

Throws:

OAuthException - if the input url is not formatted properly

See Also:

9.1 Signature Base String

normalizeUrl

public static String normalizeUrl(String requestUrl)
                           throws OAuthException

Calculates the normalized request url, as per section 9.1.2 of the OAuth Spec. This removes the querystring from the url and the port (if it is the standard http or https port).

Parameters:

requestUrl - the request url to normalize (not null)

Returns:

the normalized request url, as per the rules in the link above

Throws:

OAuthException - if the input url is not formatted properly

See Also:

9.1.2 Construct Request URL

normalizeParameters

public static String normalizeParameters(String requestUrl,
                         Map<String,String> requestParameters)

Calculates the normalized request parameters string to use in the base string, as per section 9.1.1 of the OAuth Spec.

Parameters:

requestUrl - the request url to normalize (not null)

requestParameters - key/value pairs of parameters in the request

Returns:

the parameters normalized to a string

See Also:

9.1.1 Normalize Request Parameters

parseQuerystring

public static Map<String,String> parseQuerystring(String queryString)

Parse a querystring into a map of key/value pairs.

Parameters:

queryString - the string to parse (without the '?')

Returns:

key/value pairs mapping to the items in the querystring

encode

public static String encode(String stringToEncode)

Formats the input string for inclusion in a url. Account for the differences in how OAuth encodes certain characters (such as the space character).

Parameters:

stringToEncode - the string to encode

Returns:

the url-encoded string