only create new key pair if both keys are missing

apps/encryption/lib/keymanager.php

@@ -406,19 +406,36 @@ class KeyManager {
 	}
 
 	/**
-	 * @param $userId
+	 * check if user has a private and a public key
+	 *
+	 * @param string $userId
 	 * @return bool
+	 * @throws PrivateKeyMissingException
+	 * @throws PublicKeyMissingException
 	 */
 	public function userHasKeys($userId) {
+		$privateKey = $publicKey = true;
+
 		try {
 			$this->getPrivateKey($userId);
-			$this->getPublicKey($userId);
 		} catch (PrivateKeyMissingException $e) {
-			return false;
+			$privateKey = false;
+			$exception = $e;
+		}
+		try {
+			$this->getPublicKey($userId);
 		} catch (PublicKeyMissingException $e) {
+			$publicKey = false;
+			$exception = $e;
+		}
+
+		if ($privateKey && $publicKey) {
+			return true;
+		} elseif (!$privateKey && !$publicKey) {
 			return false;
+		} else {
+			throw $exception;
 		}
-		return true;
 	}
 
 	/**

apps/encryption/tests/lib/KeyManagerTest.php

@@ -182,18 +182,62 @@ class KeyManagerTest extends TestCase {
 		);
 	}
 
-	public function testUserHasKeys() {
+	/**
+	 * @dataProvider dataTestUserHasKeys
+	 */
+	public function testUserHasKeys($key, $expected) {
 		$this->keyStorageMock->expects($this->exactly(2))
 			->method('getUserKey')
 			->with($this->equalTo($this->userId), $this->anything())
-			->willReturn('key');
+			->willReturn($key);
 
 
-		$this->assertTrue(
+		$this->assertSame($expected,
 			$this->instance->userHasKeys($this->userId)
 		);
 	}
 
+	public function dataTestUserHasKeys() {
+		return [
+			['key', true],
+			['', false]
+		];
+	}
+
+	/**
+	 * @expectedException \OCA\Encryption\Exceptions\PrivateKeyMissingException
+	 */
+	public function testUserHasKeysMissingPrivateKey() {
+		$this->keyStorageMock->expects($this->exactly(2))
+			->method('getUserKey')
+			->willReturnCallback(function ($uid, $keyID, $encryptionModuleId) {
+				if ($keyID=== 'privateKey') {
+					return '';
+				}
+				return 'key';
+			});
+
+		$this->instance->userHasKeys($this->userId);
+	}
+
+	/**
+	 * @expectedException \OCA\Encryption\Exceptions\PublicKeyMissingException
+	 */
+	public function testUserHasKeysMissingPublicKey() {
+		$this->keyStorageMock->expects($this->exactly(2))
+			->method('getUserKey')
+			->willReturnCallback(function ($uid, $keyID, $encryptionModuleId){
+				if ($keyID === 'publicKey') {
+					return '';
+				}
+				return 'key';
+			});
+
+		$this->instance->userHasKeys($this->userId);
+
+	}
+
+
 	public function testInit() {
 		$this->keyStorageMock->expects($this->any())
 			->method('getUserKey')