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This package generates proper HTTP headers to sign Oracle Cloud Infrastructure API requests https://docs.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm. Please consider as mini OCI PHP SDK due to missing official one.

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hitrov/oci-api-php-request-sign

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Oracle Cloud Infrastructure API requests sign with PHP

Latest Stable Version Test

If you prefer article style, here's a link to Medium

Installation

composer require hitrov/oci-api-php-request-sign

Import classes autoloader

require 'vendor/autoload.php';
use Hitrov\OCI\Signer;

Preparing credentials

Signer expects a list of environment variables available:

OCI_TENANCY_ID=ocid1.tenancy.oc1..aaaaaaaaba3pv6wkcr4jqae5f15p2b2m2yt2j6rx32uzr4h25vqstifsfdsq
OCI_USER_ID=ocid1.user.oc1..aaaaaaaat5nvwcna5j6aqzjcaty5eqbb6qt2jvpkanghtgdaqedqw3rynjq
OCI_KEY_FINGERPRINT=20:3b:97:13:55:1c:5b:0d:d3:37:d8:50:4e:c5:3a:34
OCI_PRIVATE_KEY_FILENAME=/path/to/privatekey.pem

There are few more ways to expose/pass them, please refer to this section.

Basic usage

Here's the example of PHP script on how to CreatePreauthenticatedRequest for Object Storage Service API.

$signer = new Signer();

$curl = curl_init();

$url = 'https://objectstorage.eu-frankfurt-1.oraclecloud.com/n/{namespaceName}/b/{bucketName}/p/';
$method = 'POST';
$body = '{"accessType": "ObjectRead", "name": "read-access-to-image.png", "objectName": "path/to/image.png", "timeExpires": "2021-03-01T00:00:00-00:00"}';

$headers = $signer->getHeaders($url, $method, $body, 'application/json');
var_dump($headers);

$curlOptions = [
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 5,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => $method,
    CURLOPT_HTTPHEADER => $headers,
];

if ($body) {
    // not needed for GET or HEAD requests
    $curlOptions[CURLOPT_POSTFIELDS] = $body;
}

curl_setopt_array($curl, $curlOptions);

$response = curl_exec($curl);
echo $response;
curl_close($curl);
array(6) {
  [0]=>
  string(35) "date: Mon, 08 Feb 2021 20:49:22 GMT"
  [1]=>
  string(50) "host: objectstorage.eu-frankfurt-1.oraclecloud.com"
  [2]=>
  string(18) "content-length: 76"
  [3]=>
  string(30) "content-type: application/json"
  [4]=>
  string(62) "x-content-sha256: X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE="
  [5]=>
  string(538) "Authorization: Signature version=\"1\",keyId=\"ocid1.tenancy.oc1..aaaaaaaaba3pv6wkcr4jqae5f15p2b2m2yt2j6rx32uzr4h25vqstifsfdsq/ocid1.user.oc1..aaaaaaaat5nvwcna5j6aqzjcaty5eqbb6qt2jvpkanghtgdaqedqw3rynjq/20:3b:97:13:55:1c:5b:0d:d3:37:d8:50:4e:c5:3a:34\",algorithm=\"rsa-sha256\",headers=\"date (request-target) host content-length content-type x-content-sha256\",signature=\"LXWXDA8VmXXc1NRbMmXtW61IS97DfIOMAnlj+Gm+oBPNc2svXYdhcXNJ+oFPoi9qJHLnoUiHqotTzuVPXSG5iyXzFntvkAn3lFIAja52iwwwcJflEIXj/b39eG2dCsOTmmUJguut0FsLhCRSX0eylTSLgxTFGoQi7K/m18nafso=\""
}
{
  "accessUri": "/p/AlIlOEsMok7oE7YkN30KJUDjDKQjk493BKbuM-ANUNGdBBAHzHT_5lFlzYC9CQiA/n/{namespaceName}/b/{bucketName}/o/path/to/image.png",
  "id": "oHJQWGxpD+2PhDqtoewvLCf8/lYNlaIpbZHYx+mBryAad/q0LnFy37Me/quKhxEi:path/to/image.png",
  "name": "read-access-to-image.png",
  "accessType": "ObjectRead",
  "objectName": "path/to/image.png",
  "timeCreated": "2021-02-09T11:52:45.053Z",
  "timeExpires": "2021-03-01T00:00:00Z"
}

That's it!

Alternatives for providing credentials

Constructor arguments

$signer = new Signer(
    $ociTenancyId,
    $ociUserId,
    $ociKeyFingerPrint,
    $privateKeyFilename
);

Separate credentials class

Implement Hitrov\OCI\KeyProvider\KeyProviderInterface methods

  • public function getPrivateKey(): string; // must return a string (contents of privatekey.pem)
  • public function getKeyId(): string; // must return a string like "{OCI_TENANCY_ID}/{OCI_USER_ID}/{OCI_KEY_FINGERPRINT}"

Force Signer to use it instead of constructor arguments and environment variables:

$keyProvider = new MockKeyProvider() // implements KeyProviderInterface;
$signer = new Signer();
$signer->setKeyProvider($keyProvider);

There's such an example covered in Unit tests tests\Hitrov\Test\MockKeyProvider.php

Manual generation steps

There are more public methods exposed for all the stuff generated behind the scenes if you need it or just curious how it works:

$signingHeadersNames = $signer->getSigningHeadersNames('POST');
var_dump($signingHeadersNames);
array(6) {
  [0]=>
  string(4) "date"
  [1]=>
  string(16) "(request-target)"
  [2]=>
  string(4) "host"
  [3]=>
  string(14) "content-length"
  [4]=>
  string(12) "content-type"
  [5]=>
  string(16) "x-content-sha256"
}
// the value of `x-content-sha256` HTTP header
$bodyHashBase64 = $signer->getBodyHashBase64($body);
// X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
$signingString = $signer->getSigningString($url, $method, $body, 'application/json');
date: Mon, 08 Feb 2021 20:51:33 GMT
(request-target): post /n/{namespaceName}/b/{bucketName}/p/
host: objectstorage.eu-frankfurt-1.oraclecloud.com
content-length: 76
content-type: application/json
x-content-sha256: X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
// part of `authorization` HTTP header value
$signature = $signer->calculateSignature($signingString, $privateKeyString);
// LXWXDA8VmXXc1NRbMmXtW61IS97DfIOMAnlj+Gm+oBPNc2svXYdhcXNJ+oFPoi9qJHLnoUiHqotTzuVPXSG5iyXzFntvkAn3lFIAja52iwwwcJflEIXj/b39eG2dCsOTmmUJguut0FsLhCRSX0eylTSLgxTFGoQi7K/m18nafso=
// part of `authorization` HTTP header value
$keyId = $signer->getKeyId(); // "{OCI_TENANCY_ID}/{OCI_USER_ID}/{OCI_KEY_FINGERPRINT}"
// ocid1.tenancy.oc1..aaaaaaaaba3pv6wkcr4jqae5f15p2b2m2yt2j6rx32uzr4h25vqstifsfdsq/ocid1.user.oc1..aaaaaaaat5nvwcna5j6aqzjcaty5eqbb6qt2jvpkanghtgdaqedqw3rynjq/20:3b:97:13:55:1c:5b:0d:d3:37:d8:50:4e:c5:3a:34

Authorization header is being generated this way (version is always 1 for this signing procedure):

Authorization: Signature version=\"1\",keyId=\"{KEY_ID}\",algorithm=\"rsa-sha256\",headers=\"{SIGNING_HEADERS_NAMES_STRING}\",signature=\"{SIGNATURE}\"

$signingHeadersNamesString = implode(' ', $signingHeadersNames);
$authorizationHeader = $signer->getAuthorizationHeader($keyId, $signingHeadersNamesString, $signature);
// Authorization: Signature version=\"1\",keyId=\"ocid1.tenancy.oc1..aaaaaaaaba3pv6wkcr4jqae5f15p2b2m2yt2j6rx32uzr4h25vqstifsfdsq/ocid1.user.oc1..aaaaaaaat5nvwcna5j6aqzjcaty5eqbb6qt2jvpkanghtgdaqedqw3rynjq/20:3b:97:13:55:1c:5b:0d:d3:37:d8:50:4e:c5:3a:34\",algorithm=\"rsa-sha256\",headers=\"date (request-target) host content-length content-type x-content-sha256\",signature=\"LXWXDA8VmXXc1NRbMmXtW61IS97DfIOMAnlj+Gm+oBPNc2svXYdhcXNJ+oFPoi9qJHLnoUiHqotTzuVPXSG5iyXzFntvkAn3lFIAja52iwwwcJflEIXj/b39eG2dCsOTmmUJguut0FsLhCRSX0eylTSLgxTFGoQi7K/m18nafso=\"

Inspiration

About

This package generates proper HTTP headers to sign Oracle Cloud Infrastructure API requests https://docs.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm. Please consider as mini OCI PHP SDK due to missing official one.

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