aws.signature (version 0.6.0)

signature_v2_auth: Signature Version 2

Description

Generates AWS Signature Version 2

Usage

signature_v2_auth(
  datetime = format(Sys.time(), "%Y-%m-%dT%H:%M:%S", tz = "UTC"),
  verb,
  service,
  path,
  query_args = list(),
  key = NULL,
  secret = NULL,
  region = NULL,
  force_credentials = FALSE,
  verbose = getOption("verbose", FALSE)
)

Arguments

datetime

A character string containing a date in the form of “YYYY-MM-DDTH:M:S”. If missing, it is generated automatically using Sys.time.

verb

A character string specify an HTTP verb/method (e.g., “GET”).

service

A character string containing the full hostname of an AWS service (e.g., “iam.amazonaws.com”, etc.)

path

A character string specify the path to the API endpoint.

query_args

A list containing named query arguments.

key

An AWS Access Key ID. If NULL, it is retrieved using locate_credentials.

secret

An AWS Secret Access Key. If NULL, it is retrieved using locate_credentials.

region

A character string containing the AWS region for the request. If missing, “us-east-1” is assumed.

force_credentials

A logical indicating whether to force use of user-supplied credentials. If FALSE (the default), locate_credentials is used to find credentials. If TRUE, user-supplied values are used regardless of their validity.

verbose

A logical indicating whether to be verbose.

Value

A list.

Details

This function generates an AWS Signature Version 2 for authorizing API requests. The function returns both an updated set of query string parameters, containing the required signature-related entries, as well as a Signature field containing the Signature string itself. Version 2 is mostly deprecated and in most cases users should rely on signature_v4_auth for Version 4 signatures instead.

References

AWS General Reference: Signature Version 2 Signing Process

See Also

signature_v4_auth, use_credentials

Examples

# NOT RUN {
# examples from:
# http://docs.aws.amazon.com/general/latest/gr/signature-version-2.html

true_string <- paste0("GET\n",
"elasticmapreduce.amazonaws.com\n",
"/\n",
"AWSAccessKeyId=AKIAIOSFODNN7EXAMPLE",
"&Action=DescribeJobFlows",
"&SignatureMethod=HmacSHA256",
"&SignatureVersion=2",
"&Timestamp=2011-10-03T15\<!-- %3A19\\%3A30", -->
"&Version=2009-03-31", collapse = "")
true_sig <- "i91nKc4PWAt0JJIdXwz9HxZCJDdiy6cf/Mj6vPxyYIs="

q1 <- 
list(Action = "DescribeJobFlows",
     Version = "2009-03-31",
     AWSAccessKeyId = "AKIAIOSFODNN7EXAMPLE",
     SignatureVersion = "2",
     SignatureMethod = "HmacSHA256",
     Timestamp = "2011-10-03T15:19:30")

sig1 <- 
signature_v2_auth(datetime = "2011-10-03T15:19:30",
                  service = "elasticmapreduce.amazonaws.com",
                  verb = "GET",
                  path = "/",
                  query_args = q1,
                  key = q1$AWSAccessKeyId,
                  secret = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY")
identical(true_string, sig1$CanonicalRequest)
identical(true_sig, sig1$Signature)

# leaving out some defaults
q2 <- 
list(Action = "DescribeJobFlows",
     Version = "2009-03-31",
     Timestamp = "2011-10-03T15:19:30")
sig2 <- 
signature_v2_auth(datetime = "2011-10-03T15:19:30",
                  service = "elasticmapreduce.amazonaws.com",
                  verb = "GET",
                  path = "/",
                  query_args = q2,
                  key = "AKIAIOSFODNN7EXAMPLE",
                  secret = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY")
identical(true_string, sig2$CanonicalRequest)
identical(true_sig, sig2$Signature)
# }