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Macro for setting *session*, and code to improve getting credentials from shared config files #36

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Macro for setting *session*, and code to improve getting credentials from shared config files #36

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475d163
LOG-IN macro for setting *session*, better detection of shared creden…
IAmRasputin May 21, 2024
9116e5b
Ignorable, not ignore. Does this matter?
IAmRasputin May 21, 2024
12a07a7
README updates for LOG-IN and service loading
IAmRasputin May 21, 2024
4dbd700
LOG-IN is a macro, not a function
IAmRasputin May 21, 2024
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35 changes: 31 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,21 +4,41 @@

This software is still ALPHA quality. The APIs will be likely to change.

## Usage
## Quick Start

AWS-SDK provides interfaces for each AWS services as individual systems under "aws-sdk/services/*".

Here's an example to send an SMS via Amazon Simple Notification Service:

```common-lisp
(ql:quickload '(:aws-sdk :aws-sdk/services/sns))
;; You must load aws-sdk first, then you can load services
(ql:quickload :aws-sdk)

;; Services can be loaded by name with quicklisp
(ql:quickload :aws-sdk/services/sns)

;; ...or via aws-load
(aws-load sns)

;; "Log in" to AWS by setting *session* via make-session
(setf aws:*session* (aws:make-session))

;; Sending
(aws/sns:publish :phone-number "+8190xxxxxxxx" :message "Hi, there")
```

You can also configure AWS-SDK to use a configured profile for authentication:
```
(setf aws:*session* (aws:make-session :profile "profile_name_here"))
```

You can _also_ also use the `LOG-IN` macro as shorthand:

``` common-lisp
(log-in :profile "profile_name_here")
```


## Configuring the SDK

### Configuring Credentials
Expand All @@ -29,8 +49,7 @@ Before using the SDK, you'll need to set AWS credentials for AWS services. AWS-S
* Shared Credentials file (~/.aws/credentials).
* EC2 Instance Role Credentials

It's also can be configured via `aws:*session*`:

To "log in" to AWS, you must set the `*session*` variable with a session containing your credentials, and any configuration. This can be done via the `make-session` function.
```common-lisp
(setf aws:*session*
(aws:make-session :credentials
Expand All @@ -56,11 +75,19 @@ It's also can be configured via `aws:*session*`:
## Development note

### Generating all services
From a Common Lisp REPL, with the current working directory set to the root of aws-sdk-lisp:
```
(ql:quickload :lake)
(lake:lake)
```

Or, from a command-line with
```
$ lake
```

See: [github.com/takagi/lake](https://github.com/takagi/lake)

## Author

* Eitaro Fukamachi ([email protected])
Expand Down
7 changes: 6 additions & 1 deletion make-session.lisp
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@@ -1,6 +1,7 @@
(defpackage #:aws-sdk/make-session
(:use #:cl)
(:import-from #:aws-sdk/session
#:*session*
#:%make-session)
(:import-from #:aws-sdk/credentials
#:credentials
Expand All @@ -24,7 +25,8 @@
#:getenv)
(:import-from #:assoc-utils
#:aget)
(:export #:make-session))
(:export #:make-session
#:log-in))
(in-package #:aws-sdk/make-session)

(defun make-session (&key credentials region (profile *aws-profile*))
Expand All @@ -51,3 +53,6 @@
:region (or region
(shared-config-region shared-config)
(getenv "AWS_REGION")))))

(defmacro log-in (&rest args)
`(setf *session* (funcall #'make-session ,@args)))
112 changes: 66 additions & 46 deletions shared-config.lisp
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Expand Up @@ -3,6 +3,7 @@
(:import-from #:aws-sdk/credentials
#:make-credentials)
(:import-from #:aws-sdk/utils/config
#:*aws-profile*
#:read-from-file)
(:import-from #:assoc-utils
#:aget)
Expand All @@ -11,6 +12,7 @@
#:shared-config-credentials
#:shared-config-region
#:shared-config-assume-role
#:shared-config-profile

#:assume-role-config
#:assume-role-role-arn
Expand All @@ -36,59 +38,77 @@
(user-homedir-pathname)))
(config-path (merge-pathnames ".aws/config"
(user-homedir-pathname)))
profile
(profile *aws-profile*)

region
credentials
(assume-role nil :type (or assume-role-config null)))

(defun make-shared-config (&rest args &key credentials-path config-path profile)
(declare (ignore credentials-path config-path))
(let ((shared-config (apply #'%make-shared-config args)))
(let ((section (with-slots (credentials-path profile) shared-config
(when (and credentials-path
(probe-file credentials-path))
(read-from-file credentials-path
:profile profile
:allow-no-profile t)))))
(let ((access-key-id (aget section "aws_access_key_id"))
(secret-access-key (aget section "aws_secret_access_key")))
(when (and access-key-id secret-access-key)
(setf (shared-config-credentials shared-config)
(make-credentials
:access-key-id access-key-id
:secret-access-key secret-access-key
:session-token (aget section "aws_session_token")
:provider-name (format nil "shared-config: ~A"
(shared-config-config-path shared-config))))))
(declare (ignorable credentials-path config-path profile))
(let* ((shared-config (apply #'%make-shared-config args))
(base-config-section (with-slots (config-path profile) shared-config
(when (and config-path
(probe-file config-path))
(read-from-file config-path
:profile profile
:allow-no-profile t))))
(base-creds-section (with-slots (credentials-path profile) shared-config
(when (and credentials-path
(probe-file credentials-path))
(read-from-file credentials-path
:profile profile
:allow-no-profile t))))
(source-profile-name (aget base-config-section "source_profile"))
(source-config-section (when source-profile-name
(with-slots (config-path) shared-config
(when (and config-path
(probe-file config-path))
(read-from-file config-path
:profile source-profile-name)))))
(source-creds-section (when source-profile-name
(with-slots (credentials-path) shared-config
(when (and credentials-path
(probe-file credentials-path))
(read-from-file credentials-path
:profile source-profile-name)))))
(role-arn (aget base-config-section "role_arn"))

(let ((role-arn (aget section "role_arn"))
(source-profile (aget section "source_profile"))
(credential-source (aget section "credential_source")))
(when (and role-arn
(or source-profile credential-source))
(when (and source-profile
credential-source)
(error "Profile ~S has both of source_profile and credential_source"
profile))
(when credential-source
(error "credential_source is not supported yet"))
(setf (shared-config-assume-role shared-config)
(make-assume-role-config :role-arn role-arn
:source-profile source-profile
:credential-source credential-source
:external-id (aget section "external_id")
:serial-number (aget section "mfa_serial")
:role-session-name (aget section "role_session_name"))))))
;; You cannot specify both source_profile and credential_source in the same profile.
(credential-source (if (and (aget base-config-section "credential_source") source-profile-name)
(error "You cannot specify both source_profile and credential_source in the same profile")
(aget base-config-section "credential_source")))
(access-key-id (or (aget base-creds-section "aws_access_key_id")
(aget source-creds-section "aws_access_key_id")))
(secret-access-key (or (aget base-creds-section "aws_secret_access_key")
(aget source-creds-section "aws_secret_access_key")))
;; I'm not sure if this is in the actual standard
(region (or (aget base-config-section "region")
(aget source-config-section "region"))))

(let ((section (with-slots (config-path profile) shared-config
(when (and config-path
(probe-file config-path))
(read-from-file config-path
:profile profile
:allow-no-profile t)))))
(let ((region (aget section "region")))
(when region
(setf (shared-config-region shared-config) region))))
(when (and credential-source (not (member credential-source '("Environment" "Ec2InstanceMetadata" "EcsContainer"))))
(error "Invalid credential_source"))

(when (and role-arn
(or source-profile-name credential-source))
(setf (shared-config-assume-role shared-config)
(make-assume-role-config :role-arn role-arn
:source-profile source-profile-name
:credential-source credential-source
:external-id (aget base-config-section "external_id")
:serial-number (aget base-config-section "mfa_serial")
:role-session-name (aget base-config-section "role_session_name"))))
(when (and access-key-id secret-access-key)
(setf (shared-config-credentials shared-config)
(make-credentials
:access-key-id access-key-id
:secret-access-key secret-access-key
:session-token (or (aget base-creds-section "aws_session_token")
(aget source-creds-section "aws_session_token"))
:provider-name (format nil "shared-config: ~A"
(shared-config-config-path shared-config)))))

(when region
(setf (shared-config-region shared-config) region))

shared-config))