package sigv4

const authorizationHeader = "Authorization"

// Signature Version 4 (SigV4) Constants
const (
	// SigningAlgorithm is the name of the algorithm used in this package.
	SigningAlgorithm = "AWS4-HMAC-SHA256"
	// EmptyStringSHA256 is the hex encoded sha256 value of an empty string.
	EmptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
	// UnsignedPayload indicates that the request payload body is unsigned.
	UnsignedPayload = "UNSIGNED-PAYLOAD"
	// AmzAlgorithmKey indicates the signing algorithm.
	AmzAlgorithmKey = "X-Amz-Algorithm"
	// AmzSecurityTokenKey indicates the security token to be used with temporary
	// credentials.
	AmzSecurityTokenKey = "X-Amz-Security-Token"
	// AmzDateKey is the UTC timestamp for the request in the format YYYYMMDD'T'HHMMSS'Z'.
	AmzDateKey = "X-Amz-Date"
	// AmzCredentialKey is the access key ID and credential scope.
	AmzCredentialKey = "X-Amz-Credential"
	// AmzSignedHeadersKey is the set of headers signed for the request.
	AmzSignedHeadersKey = "X-Amz-SignedHeaders"
	// AmzSignatureKey is the query parameter to store the SigV4 signature.
	AmzSignatureKey = "X-Amz-Signature"
	// TimeFormat is the time format to be used in the X-Amz-Date header or query
	// parameter.
	TimeFormat = "20060102T150405Z"
	// ShortTimeFormat is the shorten time format used in the credential scope.
	ShortTimeFormat = "20060102"
	// ContentSHAKey is the SHA256 of request body.
	ContentSHAKey = "X-Amz-Content-Sha256"
	// StreamingEventsPayload indicates that the request payload body is a signed
	// event stream.
	StreamingEventsPayload = "STREAMING-AWS4-HMAC-SHA256-EVENTS"
)