Added VaryGenerator

spec/Cache/Generator/HeaderCacheKeyGeneratorSpec.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace spec\Http\Client\Common\Plugin\Cache\Generator;
+
+use PhpSpec\ObjectBehavior;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+
+class HeaderCacheKeyGeneratorSpec extends ObjectBehavior
+{
+ public function let()
+ {
+ $this->beConstructedWith(['Authorization', 'Content-Type']);
+ }
+
+ public function it_is_initializable()
+ {
+ $this->shouldHaveType('Http\Client\Common\Plugin\Cache\Generator\HeaderCacheKeyGenerator');
+ }
+
+ public function it_is_a_key_generator()
+ {
+ $this->shouldImplement('Http\Client\Common\Plugin\Cache\Generator\CacheKeyGenerator');
+ }
+
+ public function it_generates_cache_from_request(RequestInterface $request, StreamInterface $body)
+ {
+ $request->getMethod()->shouldBeCalled()->willReturn('GET');
+ $request->getUri()->shouldBeCalled()->willReturn('http://example.com/foo');
+ $request->getHeaderLine('Authorization')->shouldBeCalled()->willReturn('bar');
+ $request->getHeaderLine('Content-Type')->shouldBeCalled()->willReturn('application/baz');
+ $request->getBody()->shouldBeCalled()->willReturn($body);
+ $body->__toString()->shouldBeCalled()->willReturn('');
+
+ $this->generate($request)->shouldReturn('GET http://example.com/foo Authorization:"bar" Content-Type:"application/baz" ');
+ }
+}

src/Cache/Generator/HeaderCacheKeyGenerator.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Http\Client\Common\Plugin\Cache\Generator;
+
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Generate a cache key by using HTTP headers.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+class HeaderCacheKeyGenerator implements CacheKeyGenerator
+{
+ /**
+ * The header names we should take into account when creating the cache key.
+ *
+ * @var array
+ */
+ private $headerNames;
+
+ /**
+ * @param $headerNames
+ */
+ public function __construct(array $headerNames)
+ {
+ $this->headerNames = $headerNames;
+ }
+
+ public function generate(RequestInterface $request)
+ {
+ $concatenatedHeaders = [];
+ foreach ($this->headerNames as $headerName) {
+ $concatenatedHeaders[] = sprintf(' %s:"%s"', $headerName, $request->getHeaderLine($headerName));
+ }
+
+ return $request->getMethod().' '.$request->getUri().implode('', $concatenatedHeaders).' '.$request->getBody();
+ }
+}