AbstractAWSSigner (AWS SDK for Java

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

All Implemented Interfaces:

Signer

Direct Known Subclasses:

AWS3Signer, AWS4Signer, 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.

Field Summary

Fields
Modifier and Type Field and Description

static String EMPTY_STRING_SHA256_HEX

Fields
Modifier and Type	Field and Description
`static String`	`EMPTY_STRING_SHA256_HEX`

Constructor Summary

Constructors
Constructor and Description

AbstractAWSSigner()

Constructors
Constructor and Description
`AbstractAWSSigner()`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`protected abstract void`	`addSessionCredentials(SignableRequest<?> request, AWSSessionCredentials credentials)` Adds session credentials to the request given.
`protected byte[]`	`getBinaryRequestPayload(SignableRequest<?> request)` Returns the request's payload as binary data.
`protected InputStream`	`getBinaryRequestPayloadStream(SignableRequest<?> request)`
`protected InputStream`	`getBinaryRequestPayloadStreamWithoutQueryParams(SignableRequest<?> request)`
`protected byte[]`	`getBinaryRequestPayloadWithoutQueryParams(SignableRequest<?> 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,List<String>> parameters)` Examines the specified query string parameters and returns a canonicalized form.
`protected String`	`getCanonicalizedQueryString(SignableRequest<?> request)`
`protected String`	`getCanonicalizedResourcePath(String resourcePath)`
`protected String`	`getCanonicalizedResourcePath(String resourcePath, boolean urlEncode)` This method takes in a resourcePath and canonicalizes it by adding an initial slash ("\") if that isn't already present.
`protected String`	`getRequestPayload(SignableRequest<?> request)` Returns the request's payload as a String.
`protected String`	`getRequestPayloadWithoutQueryParams(SignableRequest<?> request)` Returns the request's payload contents as a String, without processing any query string params (i.e.
`protected Date`	`getSignatureDate(int offsetInSeconds)` Returns the current time minus the given offset in seconds.
`protected int`	`getTimeOffset(SignableRequest<?> request)` Deprecated.
`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.
`byte[]`	`signWithMac(String stringData, Mac mac)`

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

- Field Detail
  - EMPTY_STRING_SHA256_HEX
```
public static final String EMPTY_STRING_SHA256_HEX
```
- Constructor Detail
  - AbstractAWSSigner
```
public AbstractAWSSigner()
```
- Method Detail
  - signAndBase64Encode
```
protected String signAndBase64Encode(String data,
                                     String key,
                                     SigningAlgorithm algorithm)
                              throws SdkClientException
```
    Computes an RFC 2104-compliant HMAC signature and returns the result as a Base64 encoded string.
    
    Throws:
    
    SdkClientException
  - signAndBase64Encode
```
protected String signAndBase64Encode(byte[] data,
                                     String key,
                                     SigningAlgorithm algorithm)
                              throws SdkClientException
```
    Computes an RFC 2104-compliant HMAC signature for an array of bytes and returns the result as a Base64 encoded string.
    
    Throws:
    
    SdkClientException
  - sign
```
public byte[] sign(String stringData,
                   byte[] key,
                   SigningAlgorithm algorithm)
            throws SdkClientException
```
    Throws:
    
    SdkClientException
  - signWithMac
```
public byte[] signWithMac(String stringData,
                          Mac mac)
```
  - sign
```
protected byte[] sign(byte[] data,
                      byte[] key,
                      SigningAlgorithm algorithm)
               throws SdkClientException
```
    Throws:
    
    SdkClientException
  - hash
```
public byte[] hash(String text)
            throws SdkClientException
```
    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:
    
    SdkClientException - If the hash cannot be computed.
  - hash
```
protected byte[] hash(InputStream input)
               throws SdkClientException
```
    Throws:
    
    SdkClientException
  - hash
```
public byte[] hash(byte[] data)
            throws SdkClientException
```
    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:
    
    SdkClientException - If the hash cannot be computed.
  - getCanonicalizedQueryString
```
protected String getCanonicalizedQueryString(Map<String,List<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(SignableRequest<?> request)
```
  - getBinaryRequestPayload
```
protected byte[] getBinaryRequestPayload(SignableRequest<?> 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(SignableRequest<?> 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(SignableRequest<?> 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(SignableRequest<?> 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(SignableRequest<?> request)
```
  - getBinaryRequestPayloadStreamWithoutQueryParams
```
protected InputStream getBinaryRequestPayloadStreamWithoutQueryParams(SignableRequest<?> request)
```
  - getCanonicalizedResourcePath
```
protected String getCanonicalizedResourcePath(String resourcePath)
```
  - getCanonicalizedResourcePath
```
protected String getCanonicalizedResourcePath(String resourcePath,
                                              boolean urlEncode)
```
    This method takes in a resourcePath and canonicalizes it by adding an initial slash ("\") if that isn't already present. Trailing slashes are preserved. If urlEncode is true, the path is also urlEncoded (double url encoding) and normalized. The urlEncoding will preserve the slash character. Normalization collapses paths with dots according to RFC 3986.
    
    Parameters:
    
    resourcePath - a path that may be urlEncoded
    
    urlEncode - true if canonicalization should include double url encode
    
    Returns:
    
    the canonical path
  - 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 offsetInSeconds)
```
    Returns the current time minus the given offset in seconds. The intent is to adjust the current time in the running JVM to the corresponding wall clock time at AWS for request signing purposes.
    
    Parameters:
    
    offsetInSeconds - offset in seconds
  - getTimeOffset
```
@Deprecated
protected int getTimeOffset(SignableRequest<?> request)
```
    Deprecated.
    
    Returns the time offset in seconds.
  - addSessionCredentials
```
protected abstract void addSessionCredentials(SignableRequest<?> 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

Class AbstractAWSSigner

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface com.amazonaws.auth.Signer

Field Detail

EMPTY_STRING_SHA256_HEX

Constructor Detail

AbstractAWSSigner

Method Detail

signAndBase64Encode

signAndBase64Encode

sign

signWithMac

sign

hash

hash

hash

getCanonicalizedQueryString

getCanonicalizedQueryString

getBinaryRequestPayload

getRequestPayload

getRequestPayloadWithoutQueryParams

getBinaryRequestPayloadWithoutQueryParams

getBinaryRequestPayloadStream

getBinaryRequestPayloadStreamWithoutQueryParams

getCanonicalizedResourcePath

getCanonicalizedResourcePath

getCanonicalizedEndpoint

sanitizeCredentials

newString

getSignatureDate

getTimeOffset

addSessionCredentials