Add PHP wrapper, use header for right platform for PHP & Swift, simplify Swift Windows fix

1 files changed, 72 insertions, 0 deletions

diff --git a/wrappers/php/src/Discovery.php b/wrappers/php/src/Discovery.php
new file mode 100644
index 0000000..3ae7010
--- /dev/null
+++ b/wrappers/php/src/Discovery.php
@@ -0,0 +1,72 @@
+<?php declare(strict_types=1);
+
+namespace EduVpn\Common;
+
+use EduVpn\Common\Impl\GoSlice;
+use Error;
+use FFI;
+use InvalidArgumentException;
+
+final class Discovery
+{
+	public function __construct() { }
+
+	private static ?FFI $ffi = null;
+
+	private static function ffi(): FFI
+	{
+		if (!self::$ffi) {
+			if (!(self::$ffi = FFI::load(__DIR__ . '/headers/eduvpn_verify_php.h')))
+				throw new Error('failed to load eduvpn_verify');
+		}
+		return self::$ffi;
+	}
+
+	/**
+	 * Verifies the signature on the JSON server_list.json/organization_list.json file.
+	 * If the function returns, the signature is valid for the given file type.
+	 *
+	 * @param string $signature        .minisig signature file contents.
+	 * @param string $signedJson       Signed .json file contents.
+	 * @param string $expectedFileName The file type to be verified, one of "server_list.json" or
+	 *                                 "organization_list.json".
+	 * @param int    $minSignTime      Minimum time for signature. Should be set to at least the time in a previously
+	 *                                 retrieved file.
+	 * @return void
+	 * @throws InvalidArgumentException If expectedFileName is not one of the allowed values.
+	 * @throws VerifyException If signature verification fails.
+	 */
+	public static function verify(string $signature, string $signedJson, string $expectedFileName,
+		  int $minSignTime): void
+	{
+		$ffi              = self::ffi();
+		$signatureData    = new GoSlice($ffi, $signature);
+		$jsonData         = new GoSlice($ffi, $signedJson);
+		$expectedNameData = new GoSlice($ffi, $expectedFileName);
+
+		$result = $ffi->Verify($signatureData->slice(), $jsonData->slice(), $expectedNameData->slice(), $minSignTime);
+
+		switch ($result) {
+			case 0:
+				return;
+			case 1:
+				throw new InvalidArgumentException('unknown expected file name', $result);
+			case 2:
+				throw new InvalidSignatureException();
+			case 3:
+				throw new InvalidSignatureUnknownKeyException();
+			case 4:
+				throw new SignatureTooOldException();
+			default:
+				throw new UnknownVerifyException($result);
+		}
+	}
+
+	/** @internal Use for testing only, see Go documentation. */
+	public static function insecureTestingSetExtraKey(string $keyString): void
+	{
+		$ffi     = self::ffi();
+		$keyData = new GoSlice($ffi, $keyString);
+		$ffi->InsecureTestingSetExtraKey($keyData->slice());
+	}
+}