Resolve and follow redirects to relative URIs

README.md

@@ -252,6 +252,11 @@ The `getUri()` method can be used to get its [`Uri`](#uri) instance.
 
 ### Uri
 
+An `Uri` represents an absolute URI (aka URL).
+
+By definition of this library, an `Uri` instance is always absolute and can not contain any placeholders.
+As such, any incomplete/relative URI will be rejected with an `InvalidArgumentException`.
+
 Each [`Request`](#request) contains a (full) absolute request URI.
 
 ```
@@ -265,6 +270,8 @@ assert('/' == $uri->getPath());
 
 See its [class outline](src/Message/Uri.php) for more details.
 
+Internally, this class uses the excellent [ml/iri](https://github.com/lanthaler/IRI) library under the hood.
+
 ### ResponseException
 
 The `ResponseException` is an `Exception` sub-class that will be used to reject

composer.json

@@ -20,6 +20,7 @@
         "react/socket-client": "0.3.*|0.4.*",
         "react/dns": "0.3.*|0.4.*",
         "react/promise": "1.*|2.*",
-        "rize/uri-template": "~0.3.0"
+        "rize/uri-template": "~0.3.0",
+        "ml/iri": "~1.0"
     }
 }

src/Io/Transaction.php

@@ -64,18 +64,8 @@ public function onResponse(Response $response, Request $request)
     {
         $this->progress('response', array($response, $request));
 
-        if ($this->followRedirects && ($response->getCode() >= 300 && $response->getCode() < 400 && $location = $response->getHeader('Location'))) {
-            // naïve approach..
-            $method = ($request->getMethod() === 'HEAD') ? 'HEAD' : 'GET';
-            $request = new Request($method, $location);
-
-            $this->progress('redirect', array($request));
-
-            if ($this->numRequests >= $this->maxRedirects) {
-                throw new \RuntimeException('Maximum number of redirects (' . $this->maxRedirects . ') exceeded');
-            }
-
-            return $this->next($request);
+        if ($this->followRedirects && ($response->getCode() >= 300 && $response->getCode() < 400)) {
+            return $this->onResponseRedirect($response, $request);
         }
 
         // only status codes 200-399 are considered to be valid, reject otherwise
@@ -94,6 +84,23 @@ public function onError(Exception $error, Request $request)
         throw $error;
     }
 
+    private function onResponseRedirect(Response $response, Request $request)
+    {
+        $location = $request->getUri()->resolve($response->getHeader('Location'));
+
+        // naïve approach..
+        $method = ($request->getMethod() === 'HEAD') ? 'HEAD' : 'GET';
+        $request = new Request($method, $location);
+
+        $this->progress('redirect', array($request));
+
+        if ($this->numRequests >= $this->maxRedirects) {
+            throw new \RuntimeException('Maximum number of redirects (' . $this->maxRedirects . ') exceeded');
+        }
+
+        return $this->next($request);
+    }
+
     private function progress($name, array $args = array())
     {
         return;

src/Message/Uri.php

@@ -3,70 +3,87 @@
 namespace Clue\React\Buzz\Message;
 
 use InvalidArgumentException;
+use ML\IRI\IRI;
 
+/**
+ * An `Uri` represents an absolute URI (aka URL).
+ *
+ * By definition of this library, an `Uri` instance is always absolute and can not contain any placeholders.
+ */
 class Uri
 {
-    private $scheme;
-    private $host;
-    private $port;
-    private $path;
-    private $query;
+    private $iri;
 
+    /**
+     * Instantiate new absolute URI instance
+     *
+     * By definition of this library, an `Uri` instance is always absolute and can not contain any placeholders.
+     * As such, any incomplete/relative URI will be rejected with an `InvalidArgumentException`.
+     *
+     * @param string|Uri|IRI $uri
+     * @throws InvalidArgumentException for incomplete/relative URIs
+     */
     public function __construct($uri)
     {
-        $parts = parse_url($uri);
-        if (!$parts || !isset($parts['scheme'], $parts['host'], $parts['path'])) {
+        if (!$uri instanceof IRI) {
+            $uri = new IRI($uri);
+        }
+
+        if (!$uri->isAbsolute() || $uri->getHost() === '' || $uri->getPath() === '') {
             throw new InvalidArgumentException('Not a valid absolute URI');
         }
 
         if (strpos($uri, '{') !== false) {
-            throw new \InvalidArgumentException('Contains placeholders');
+            throw new InvalidArgumentException('Contains placeholders');
         }
 
-        $this->scheme = $parts['scheme'];
-        $this->host = $parts['host'];
-        $this->port = isset($parts['port']) ? $parts['port'] : null;
-        $this->path = $parts['path'];
-        $this->query = isset($parts['query']) ? $parts['query'] : '';
+        $this->iri = $uri;
     }
 
     public function __toString()
     {
-        $url = $this->scheme . '://' . $this->host;
-        if ($this->port !== null) {
-            $url .= ':' . $this->port;
-        }
-        $url .= $this->path;
-        if ($this->query !== '') {
-            $url .= '?' . $this->query;
-        }
-
-        return $url;
+        return (string)$this->iri;
     }
 
     public function getScheme()
     {
-        return $this->scheme;
+        return $this->iri->getScheme();
     }
 
     public function getHost()
     {
-        return $this->host;
+        return $this->iri->getHost();
     }
 
     public function getPort()
     {
-        return $this->port;
+        return $this->iri->getPort();
     }
 
     public function getPath()
     {
-        return $this->path;
+        return $this->iri->getPath();
     }
 
     public function getQuery()
     {
-        return $this->query;
+        return $this->iri->getQuery();
+    }
+
+    /**
+     * Resolve a (relative) URI reference against this URI
+     *
+     * @param string|Uri $uri relative or absolute URI
+     * @return Uri absolute URI
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2
+     * @uses IRI::resolve()
+     */
+    public function resolve($uri)
+    {
+        if ($uri instanceof self) {
+            $uri = (string)$uri;
+        }
+        return new self($this->iri->resolve($uri));
     }
 
     /**
@@ -95,25 +112,17 @@ public function expandBase($uri)
             return $uri;
         }
 
-        $new = clone $this;
-
-        $pos = strpos($uri, '?');
-        if ($pos !== false) {
-            $new->query = substr($uri, $pos + 1);
-            $uri = substr($uri, 0, $pos);
-        }
+        $base = (string)$this;
 
-        if ($uri !== '' && substr($new->path, -1) !== '/') {
-            $new->path .= '/';
+        if ($uri !== '' && substr($base, -1) !== '/' && substr($uri, 0, 1) !== '?') {
+            $base .= '/';
         }
 
         if (isset($uri[0]) && $uri[0] === '/') {
             $uri = substr($uri, 1);
         }
 
-        $new->path .= $uri;
-
-        return (string)$new;
+        return $base . $uri;
     }
 
     /**
@@ -127,7 +136,7 @@ public function expandBase($uri)
      */
     public function assertBaseOf(Uri $new)
     {
-        if ($new->scheme !== $this->scheme || $new->host !== $this->host || $new->port !== $this->port || strpos($new->path, $this->path) !== 0) {
+        if (strpos((string)$new, (string)$this) !== 0) {
             throw new \UnexpectedValueException('Invalid base, "' . $new . '" does not appear to be below "' . $this . '"');
         }
 

tests/FunctionalBrowserTest.php

@@ -24,7 +24,14 @@ public function testSimpleRequest()
         $this->loop->run();
     }
 
-    public function testRedirectRequest()
+    public function testRedirectRequestRelative()
+    {
+        $this->expectPromiseResolve($this->browser->get($this->base . 'redirect-to?url=get'));
+
+        $this->loop->run();
+    }
+
+    public function testRedirectRequestAbsolute()
     {
         $this->expectPromiseResolve($this->browser->get($this->base . 'redirect-to?url=' . urlencode($this->base . 'get')));
 

tests/Message/UriTest.php

@@ -106,4 +106,29 @@ public function testAssertNotBase($other)
 
         $base->assertBaseOf(new Uri($other));
     }
+
+    public function testResolveRelative()
+    {
+        $base = new Uri('http://example.com/base/');
+
+        $this->assertEquals('http://example.com/base/', $base->resolve(''));
+        $this->assertEquals('http://example.com/', $base->resolve('/'));
+
+        $this->assertEquals('http://example.com/base/a', $base->resolve('a'));
+        $this->assertEquals('http://example.com/a', $base->resolve('../a'));
+    }
+
+    public function testResolveAbsolute()
+    {
+        $base = new Uri('http://example.org/');
+
+        $this->assertEquals('http://www.example.com/', $base->resolve('http://www.example.com/'));
+    }
+
+    public function testResolveUri()
+    {
+        $base = new Uri('http://example.org/');
+
+        $this->assertEquals('http://www.example.com/', $base->resolve(new Uri('http://www.example.com/')));
+    }
 }