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<?php namespace AwsHelper; |
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/* this class is designed to work on EC2 servers and in the office only. |
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If you need to access the security settings outside the office then please |
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add your own aws.json file to the storage folder with the needed security |
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access key and password */ |
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class AwsHelper |
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{ |
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private $iam_role; |
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private $iam_url; |
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public function __construct($iam_role, $iam_url='http://169.254.169.254/latest/meta-data/iam/security-credentials/') |
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{ |
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if (empty($iam_role)) |
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throw new \Exception('iam_role is empty'); |
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if (empty($iam_url)) |
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throw new \Exception('iam_url is empty'); |
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$this->iam_role = $iam_role; |
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$this->iam_url = $iam_url; |
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$json = $this->getAccessData($iam_role, $iam_url); |
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if ($json->Code !== 'Success') |
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throw new \Exception('Unsuccessful in returning iam amazon credentials'); |
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if (empty($json->AccessKeyId)) |
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throw new \Exception('AccessKeyId does not exist.'); |
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if (empty($json->SecretAccessKey)) |
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throw new \Exception('SecretAccessKey does not exist.'); |
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$this->json = $json; |
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} |
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public function getJSON() |
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{ |
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return $this->json; |
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} |
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public function getDefaultOptions($aws_key=null, $aws_secret=null) |
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{ |
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$opts = [ |
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'key' => $aws_key, |
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'secret' => $aws_secret, |
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]; |
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if (empty($aws_key) || empty($aws_secret)) |
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{ |
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$json = $this->getJSON(); |
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if ($json->Code !== 'Success') |
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throw new \Exception('Unsuccessful in returning iam amazon credentials'); |
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if (empty($json->AccessKeyId)) |
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throw new \Exception('AccessKeyId does not exist. This is possibly a problem with you aws setup.'); |
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if (empty($json->SecretAccessKey)) |
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throw new \Exception('SecretAccessKey does not exist. This is possibly a problem with you aws setup.'); |
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if (!empty($json->Token)) |
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{ |
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// check token expiration |
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if ($this->hasAccessExpired($json->Expiration)) |
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{ |
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$this->json = $this->getAccessData($this->iam_role, $this->iam_url); |
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return $this->getDefaultOptions(); |
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} |
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} |
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$opts = [ |
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'key' => $json->AccessKeyId, |
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'secret' => $json->SecretAccessKey, |
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'token' => $json->Token, |
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]; |
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} |
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return $opts; |
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} |
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private function getAccessData($iam_role, $iam_url) |
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{ |
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/* grab the access and secret key from the iam role "aws-opsworks-ec2-role" */ |
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if (file_exists(storage_path().'/aws.json')) |
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{ |
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$json = json_decode(file_get_contents(storage_path().'/aws.json')); |
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if (property_exists($json, 'Expiration') and !$this->hasAccessExpired($json->Expiration)) |
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{ |
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return $json; |
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} |
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} |
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// get json from the amazon iam service. |
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$json = file_get_contents($iam_url.$iam_role); |
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file_put_contents(storage_path().'/aws.json', $json); |
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return json_decode($json); |
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} |
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public function hasAccessExpired($date) |
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{ |
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$date = new \DateTime($date); |
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if ($date->format('U')-date('U') > 0) |
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return false; |
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return true; |
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} |
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} |
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andrewfenn /
awshelper
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: