com.amazonaws.auth
Class AbstractAWSSigner

java.lang.Object
  com.amazonaws.auth.AbstractAWSSigner

All Implemented Interfaces:

Signer

Direct Known Subclasses:

AWS3Signer, AWS4Signer, CloudFrontSigner, QueryStringSigner

public abstract class AbstractAWSSigner
extends Object
implements Signer

Abstract base class for AWS signing protocol implementations. Provides utilities commonly needed by signing protocols such as computing canonicalized host names, query string parameters, etc.

Not intended to be sub-classed by developers.

Constructor Summary

AbstractAWSSigner()

Method Summary

protected abstract void	addSessionCredentials(Request<?> request, AWSSessionCredentials credentials) Adds session credentials to the request given.
protected byte[]	getBinaryRequestPayload(Request<?> request) Returns the request's payload as binary data.
protected InputStream	getBinaryRequestPayloadStream(Request<?> request)
protected InputStream	getBinaryRequestPayloadStreamWithoutQueryParams(Request<?> request)
protected byte[]	getBinaryRequestPayloadWithoutQueryParams(Request<?> request) Returns the request's payload contents as binary data, without processing any query string params (i.e.
protected String	getCanonicalizedEndpoint(URI endpoint)
protected String	getCanonicalizedQueryString(Map<String,String> parameters) Examines the specified query string parameters and returns a canonicalized form.
protected String	getCanonicalizedQueryString(Request<?> request)
protected String	getCanonicalizedResourcePath(String resourcePath)
protected String	getCanonicalizedResourcePath(String resourcePath, boolean urlEncode)
protected String	getRequestPayload(Request<?> request) Returns the request's payload as a String.
protected String	getRequestPayloadWithoutQueryParams(Request<?> request) Returns the request's payload contents as a String, without processing any query string params (i.e.
protected Date	getSignatureDate(int timeOffset)
protected int	getTimeOffset(Request<?> request)
byte[]	hash(byte[] data) Hashes the binary data using the SHA-256 algorithm.
protected byte[]	hash(InputStream input)
byte[]	hash(String text) Hashes the string contents (assumed to be UTF-8) using the SHA-256 algorithm.
protected String	newString(byte[] bytes) Safely converts a UTF-8 encoded byte array into a String.
protected AWSCredentials	sanitizeCredentials(AWSCredentials credentials) Loads the individual access key ID and secret key from the specified credentials, ensuring that access to the credentials is synchronized on the credentials object itself, and trimming any extra whitespace from the credentials.
protected byte[]	sign(byte[] data, byte[] key, SigningAlgorithm algorithm)
byte[]	sign(String stringData, byte[] key, SigningAlgorithm algorithm)
protected String	signAndBase64Encode(byte[] data, String key, SigningAlgorithm algorithm) Computes an RFC 2104-compliant HMAC signature for an array of bytes and returns the result as a Base64 encoded string.
protected String	signAndBase64Encode(String data, String key, SigningAlgorithm algorithm) Computes an RFC 2104-compliant HMAC signature and returns the result as a Base64 encoded string.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.amazonaws.auth.Signer

sign

Constructor Detail

AbstractAWSSigner

public AbstractAWSSigner()

Method Detail

signAndBase64Encode

protected String signAndBase64Encode(String data,
                                     String key,
                                     SigningAlgorithm algorithm)
                              throws AmazonClientException

Computes an RFC 2104-compliant HMAC signature and returns the result as a Base64 encoded string.

Throws:

AmazonClientException

signAndBase64Encode

protected String signAndBase64Encode(byte[] data,
                                     String key,
                                     SigningAlgorithm algorithm)
                              throws AmazonClientException

Computes an RFC 2104-compliant HMAC signature for an array of bytes and returns the result as a Base64 encoded string.

Throws:

AmazonClientException

sign

public byte[] sign(String stringData,
                   byte[] key,
                   SigningAlgorithm algorithm)
            throws AmazonClientException

Throws:

AmazonClientException

sign

protected byte[] sign(byte[] data,
                      byte[] key,
                      SigningAlgorithm algorithm)
               throws AmazonClientException

Throws:

AmazonClientException

hash

public byte[] hash(String text)
            throws AmazonClientException

Hashes the string contents (assumed to be UTF-8) using the SHA-256 algorithm.

Parameters:

text - The string to hash.

Returns:

The hashed bytes from the specified string.

Throws:

AmazonClientException - If the hash cannot be computed.

hash

protected byte[] hash(InputStream input)
               throws AmazonClientException

Throws:

AmazonClientException

hash

public byte[] hash(byte[] data)
            throws AmazonClientException

Hashes the binary data using the SHA-256 algorithm.

Parameters:

data - The binary data to hash.

Returns:

The hashed bytes from the specified data.

Throws:

AmazonClientException - If the hash cannot be computed.

getCanonicalizedQueryString

protected String getCanonicalizedQueryString(Map<String,String> parameters)

Examines the specified query string parameters and returns a canonicalized form.

The canonicalized query string is formed by first sorting all the query string parameters, then URI encoding both the key and value and then joining them, in order, separating key value pairs with an '&'.

Parameters:

parameters - The query string parameters to be canonicalized.

Returns:

A canonicalized form for the specified query string parameters.

getCanonicalizedQueryString

protected String getCanonicalizedQueryString(Request<?> request)

getBinaryRequestPayload

protected byte[] getBinaryRequestPayload(Request<?> request)

Returns the request's payload as binary data.

Parameters:

request - The request

Returns:

The data from the request's payload, as binary data.

getRequestPayload

protected String getRequestPayload(Request<?> request)

Returns the request's payload as a String.

Parameters:

request - The request

Returns:

The data from the request's payload, as a string.

getRequestPayloadWithoutQueryParams

protected String getRequestPayloadWithoutQueryParams(Request<?> request)

Returns the request's payload contents as a String, without processing any query string params (i.e. no form encoding for query params).

Parameters:

request - The request

Returns:

the request's payload contents as a String, not including any form encoding of query string params.

getBinaryRequestPayloadWithoutQueryParams

protected byte[] getBinaryRequestPayloadWithoutQueryParams(Request<?> request)

Returns the request's payload contents as binary data, without processing any query string params (i.e. no form encoding for query params).

Parameters:

request - The request

Returns:

The request's payload contents as binary data, not including any form encoding of query string params.

getBinaryRequestPayloadStream

protected InputStream getBinaryRequestPayloadStream(Request<?> request)

getBinaryRequestPayloadStreamWithoutQueryParams

protected InputStream getBinaryRequestPayloadStreamWithoutQueryParams(Request<?> request)

getCanonicalizedResourcePath

protected String getCanonicalizedResourcePath(String resourcePath)

getCanonicalizedResourcePath

protected String getCanonicalizedResourcePath(String resourcePath,
                                              boolean urlEncode)

getCanonicalizedEndpoint

protected String getCanonicalizedEndpoint(URI endpoint)

sanitizeCredentials

protected AWSCredentials sanitizeCredentials(AWSCredentials credentials)

Loads the individual access key ID and secret key from the specified credentials, ensuring that access to the credentials is synchronized on the credentials object itself, and trimming any extra whitespace from the credentials.

Returns either a BasicSessionCredentials or a BasicAWSCredentials object, depending on the input type.

Parameters:

credentials -

Returns:

A new credentials object with the sanitized credentials.

newString

protected String newString(byte[] bytes)

Safely converts a UTF-8 encoded byte array into a String.

Parameters:

bytes - UTF-8 encoded binary character data.

Returns:

The converted String object.

getSignatureDate

protected Date getSignatureDate(int timeOffset)

getTimeOffset

protected int getTimeOffset(Request<?> request)

addSessionCredentials

protected abstract void addSessionCredentials(Request<?> request,
                                              AWSSessionCredentials credentials)

Adds session credentials to the request given.

Parameters:

request - The request to add session credentials information to

credentials - The session credentials to add to the request