Merge branch 'request-set-input' into 2.6

Fixes #3764

lib/Cake/Network/CakeRequest.php

@@ -915,6 +915,17 @@ class CakeRequest implements ArrayAccess {
 		return $input;
 	}
 
+/**
+ * Modify data originally from `php://input`. Useful for altering json/xml data
+ * in middleware or DispatcherFilters before it gets to RequestHandlerComponent
+ *
+ * @param string $input A string to replace original parsed data from input()
+ * @return void
+ */
+	public function setInput($input) {
+		$this->_input = $input;
+	}
+
 /**
  * Allow only certain HTTP request methods. If the request method does not match
  * a 405 error will be shown and the required "Allow" response header will be set.

lib/Cake/Test/Case/Network/CakeRequestTest.php

@@ -2081,7 +2081,7 @@ class CakeRequestTest extends CakeTestCase {
 
 /**
  * Data provider for testing reading values with CakeRequest::param()
- * 
+ *
  * @return array
  */
 	public function paramReadingDataProvider() {
@@ -2218,6 +2218,22 @@ class CakeRequestTest extends CakeTestCase {
 		$this->assertEquals('/posts/base_path/1/name:value?test=value', $result);
 	}
 
+/**
+ * Test the input() method.
+ *
+ * @return void
+ */
+	public function testSetInput() {
+		$request = new CakeRequest('/');
+
+		$request->setInput('I came from setInput');
+		$result = $request->input();
+		$this->assertEquals('I came from setInput', $result);
+
+		$result = $request->input();
+		$this->assertEquals('I came from setInput', $result);
+	}
+
 /**
  * Test the input() method.
  *