cloudwatch-controller/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [25:45]:
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public abstract class AWS4SignerBase {

    /** SHA256 hash of an empty request body **/
    public static final String EMPTY_BODY_SHA256 = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
    public static final String UNSIGNED_PAYLOAD = "UNSIGNED-PAYLOAD";
    
    public static final String SCHEME = "AWS4";
    public static final String ALGORITHM = "HMAC-SHA256";
    public static final String TERMINATOR = "aws4_request";
    
    /** format strings for the date/time and date stamps required during signing **/
    public static final String ISO8601BasicFormat = "yyyyMMdd'T'HHmmss'Z'";
    public static final String DateStringFormat = "yyyyMMdd";
    
    protected URL endpointUrl;
    protected String httpMethod;
    protected String serviceName;
    protected String regionName;
    
    protected final SimpleDateFormat dateTimeFormat;
    protected final SimpleDateFormat dateStampFormat;
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cloudwatch-lambda/src/main/java/com/amazonwebservices/blogs/containers/sigv4/AWS4SignerBase.java [25:45]:
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public abstract class AWS4SignerBase {

    /** SHA256 hash of an empty request body **/
    public static final String EMPTY_BODY_SHA256 = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
    public static final String UNSIGNED_PAYLOAD = "UNSIGNED-PAYLOAD";
    
    public static final String SCHEME = "AWS4";
    public static final String ALGORITHM = "HMAC-SHA256";
    public static final String TERMINATOR = "aws4_request";
    
    /** format strings for the date/time and date stamps required during signing **/
    public static final String ISO8601BasicFormat = "yyyyMMdd'T'HHmmss'Z'";
    public static final String DateStringFormat = "yyyyMMdd";
    
    protected URL endpointUrl;
    protected String httpMethod;
    protected String serviceName;
    protected String regionName;
    
    protected final SimpleDateFormat dateTimeFormat;
    protected final SimpleDateFormat dateStampFormat;
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