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<?php

namespace League\OAuth1\Client\Credentials;

use OpenSSLAsymmetricKey;

class RsaClientCredentials extends ClientCredentials
{
    /**
     * @var string
     */
    protected $rsaPublicKeyFile;

    /**
     * @var string
     */
    protected $rsaPrivateKeyFile;

    /**
     * @var resource|OpenSSLAsymmetricKey|null
     */
    protected $rsaPublicKey;

    /**
     * @var resource|OpenSSLAsymmetricKey|null
     */
    protected $rsaPrivateKey;

    /**
     * Sets the path to the RSA public key.
     *
     * @param string $filename
     *
     * @return self
     */
    public function setRsaPublicKey($filename)
    {
        $this->rsaPublicKeyFile = $filename;
        $this->rsaPublicKey = null;

        return $this;
    }

    /**
     * Sets the path to the RSA private key.
     *
     * @param string $filename
     *
     * @return self
     */
    public function setRsaPrivateKey($filename)
    {
        $this->rsaPrivateKeyFile = $filename;
        $this->rsaPrivateKey = null;

        return $this;
    }

    /**
     * Gets the RSA public key.
     *
     * @throws CredentialsException when the key could not be loaded.
     *
     * @return resource|OpenSSLAsymmetricKey
     */
    public function getRsaPublicKey()
    {
        if ($this->rsaPublicKey) {
            return $this->rsaPublicKey;
        }

        if ( ! file_exists($this->rsaPublicKeyFile)) {
            throw new CredentialsException('Could not read the public key file.');
        }

        $this->rsaPublicKey = openssl_get_publickey(file_get_contents($this->rsaPublicKeyFile));

        if ( ! $this->rsaPublicKey) {
            throw new CredentialsException('Cannot access public key for signing');
        }

        return $this->rsaPublicKey;
    }

    /**
     * Gets the RSA private key.
     *
     * @throws CredentialsException when the key could not be loaded.
     *
     * @return resource|OpenSSLAsymmetricKey
     */
    public function getRsaPrivateKey()
    {
        if ($this->rsaPrivateKey) {
            return $this->rsaPrivateKey;
        }

        if ( ! file_exists($this->rsaPrivateKeyFile)) {
            throw new CredentialsException('Could not read the private key file.');
        }

        $this->rsaPrivateKey = openssl_pkey_get_private(file_get_contents($this->rsaPrivateKeyFile));

        if ( ! $this->rsaPrivateKey) {
            throw new CredentialsException('Cannot access private key for signing');
        }

        return $this->rsaPrivateKey;
    }
}