update README w/ pointer to aws.signature docs

DESCRIPTION

@@ -2,7 +2,7 @@ Package: aws.s3
 Type: Package
 Title: 'AWS S3' Client Package
 Version: 0.3.12
-Date: 2018-04-16
+Date: 2018-05-25
 Authors@R: c(person("Thomas J.", "Leeper", role = c("aut", "cre"),
                     email = "[email protected]",
                     comment = c(ORCID = "0000-0003-4097-6326")),

README.Rmd

@@ -4,33 +4,15 @@
 
 To use the package, you will need an AWS account and to enter your credentials into R. Your keypair can be generated on the [IAM Management Console](https://aws.amazon.com/) under the heading *Access Keys*. Note that you only have access to your secret key once. After it is generated, you need to save it in a secure location. New keypairs can be generated at any time if yours has been lost, stolen, or forgotten. The [**aws.iam** package](https://github.com/cloudyr/aws.iam) profiles tools for working with IAM, including creating roles, users, groups, and credentials programmatically; it is not needed to *use* IAM credentials.
 
-By default, all **cloudyr** packages for AWS services allow the use of credentials specified in a number of ways, beginning with:
-
- 1. User-supplied values passed directly to functions.
- 2. Environment variables, which can alternatively be set on the command line prior to starting R or via an `Renviron.site` or `.Renviron` file, which are used to set environment variables in R during startup (see `? Startup`). Or they can be set within R:
-
-    ```R
-    Sys.setenv("AWS_ACCESS_KEY_ID" = "mykey",
-               "AWS_SECRET_ACCESS_KEY" = "mysecretkey",
-               "AWS_DEFAULT_REGION" = "us-east-1",
-               "AWS_SESSION_TOKEN" = "mytoken")
-    ```
- 3. If R is running an EC2 instance, the role profile credentials provided by [**aws.ec2metadata**](https://cran.r-project.org/package=aws.ec2metadata).
- 4. Profiles saved in a `/.aws/credentials` "dot file" in the current working directory. The `"default" profile is assumed if none is specified.
- 5. [A centralized `~/.aws/credentials` file](https://blogs.aws.amazon.com/security/post/Tx3D6U6WSFGOK2H/A-New-and-Standardized-Way-to-Manage-Credentials-in-the-AWS-SDKs), containing credentials for multiple accounts. The `"default" profile is assumed if none is specified.
-
-Profiles stored locally or in a centralized location (e.g., `~/.aws/credentials`) can also be invoked via:
+A detailed description of how credentials can be specified is provided at: https://github.com/cloudyr/aws.signature/. The easiest way is to simply set environmetn variables on the command line prior to starting R or via an `Renviron.site` or `.Renviron` file, which are used to set environment variables in R during startup (see `? Startup`). Or they can be set within R:
 
 ```R
-# use your 'default' account credentials
-aws.signature::use_credentials()
-
-# use an alternative credentials profile
-aws.signature::use_credentials(profile = "bob")
+Sys.setenv("AWS_ACCESS_KEY_ID" = "mykey",
+           "AWS_SECRET_ACCESS_KEY" = "mysecretkey",
+           "AWS_DEFAULT_REGION" = "us-east-1",
+           "AWS_SESSION_TOKEN" = "mytoken")
 ```
 
-Temporary session tokens are stored in environment variable `AWS_SESSION_TOKEN` (and will be stored there by the `use_credentials()` function). The [aws.iam package](https://github.com/cloudyr/aws.iam/) provides an R interface to IAM roles and the generation of temporary session tokens via the security token service (STS).
-
 To use the package with S3-compatible storage provided by other cloud platforms, set the `AWS_S3_ENDPOINT` environment variable to the appropriate host name. By default, the package uses the AWS endpoint: `s3.amazonaws.com`
 
 

README.md

@@ -4,33 +4,15 @@
 
 To use the package, you will need an AWS account and to enter your credentials into R. Your keypair can be generated on the [IAM Management Console](https://aws.amazon.com/) under the heading *Access Keys*. Note that you only have access to your secret key once. After it is generated, you need to save it in a secure location. New keypairs can be generated at any time if yours has been lost, stolen, or forgotten. The [**aws.iam** package](https://github.com/cloudyr/aws.iam) profiles tools for working with IAM, including creating roles, users, groups, and credentials programmatically; it is not needed to *use* IAM credentials.
 
-By default, all **cloudyr** packages for AWS services allow the use of credentials specified in a number of ways, beginning with:
-
- 1. User-supplied values passed directly to functions.
- 2. Environment variables, which can alternatively be set on the command line prior to starting R or via an `Renviron.site` or `.Renviron` file, which are used to set environment variables in R during startup (see `? Startup`). Or they can be set within R:
-
-    ```R
-    Sys.setenv("AWS_ACCESS_KEY_ID" = "mykey",
-               "AWS_SECRET_ACCESS_KEY" = "mysecretkey",
-               "AWS_DEFAULT_REGION" = "us-east-1",
-               "AWS_SESSION_TOKEN" = "mytoken")
-    ```
- 3. If R is running an EC2 instance, the role profile credentials provided by [**aws.ec2metadata**](https://cran.r-project.org/package=aws.ec2metadata).
- 4. Profiles saved in a `/.aws/credentials` "dot file" in the current working directory. The `"default" profile is assumed if none is specified.
- 5. [A centralized `~/.aws/credentials` file](https://blogs.aws.amazon.com/security/post/Tx3D6U6WSFGOK2H/A-New-and-Standardized-Way-to-Manage-Credentials-in-the-AWS-SDKs), containing credentials for multiple accounts. The `"default" profile is assumed if none is specified.
-
-Profiles stored locally or in a centralized location (e.g., `~/.aws/credentials`) can also be invoked via:
+A detailed description of how credentials can be specified is provided at: https://github.com/cloudyr/aws.signature/. The easiest way is to simply set environmetn variables on the command line prior to starting R or via an `Renviron.site` or `.Renviron` file, which are used to set environment variables in R during startup (see `? Startup`). Or they can be set within R:
 
 ```R
-# use your 'default' account credentials
-aws.signature::use_credentials()
-
-# use an alternative credentials profile
-aws.signature::use_credentials(profile = "bob")
+Sys.setenv("AWS_ACCESS_KEY_ID" = "mykey",
+           "AWS_SECRET_ACCESS_KEY" = "mysecretkey",
+           "AWS_DEFAULT_REGION" = "us-east-1",
+           "AWS_SESSION_TOKEN" = "mytoken")
 ```
 
-Temporary session tokens are stored in environment variable `AWS_SESSION_TOKEN` (and will be stored there by the `use_credentials()` function). The [aws.iam package](https://github.com/cloudyr/aws.iam/) provides an R interface to IAM roles and the generation of temporary session tokens via the security token service (STS).
-
 To use the package with S3-compatible storage provided by other cloud platforms, set the `AWS_S3_ENDPOINT` environment variable to the appropriate host name. By default, the package uses the AWS endpoint: `s3.amazonaws.com`