ResponseBuilder class.

spec/Builder/ResponseBuilderSpec.php

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+<?php
+
+namespace spec\Http\Message\Builder;
+
+use PhpSpec\ObjectBehavior;
+use Psr\Http\Message\ResponseInterface;
+
+class ResponseBuilderSpec extends ObjectBehavior
+{
+    function it_is_initializable(ResponseInterface $response)
+    {
+        $this->beConstructedWith($response);
+        $this->shouldHaveType('Http\Message\Builder\ResponseBuilder');
+    }
+
+    function it_reads_headers_from_array(ResponseInterface $response)
+    {
+        $response->withStatus(200, 'OK')->willReturn($response);
+        $response->withProtocolVersion('1.1')->willReturn($response);
+        $response->hasHeader('Content-type')->willReturn(false);
+        $response->withHeader('Content-type', 'text/html')->willReturn($response);
+        $this->beConstructedWith($response);
+        $this->setHeadersFromArray(['HTTP/1.1 200 OK', 'Content-type: text/html']);
+    }
+
+    function it_reads_headers_from_string(ResponseInterface $response)
+    {
+        $response->withStatus(200, 'OK')->willReturn($response);
+        $response->withProtocolVersion('1.1')->willReturn($response);
+        $response->hasHeader('Content-type')->willReturn(false);
+        $response->withHeader('Content-type', 'text/html')->willReturn($response);
+        $this->beConstructedWith($response);
+        $this->setHeadersFromString("HTTP/1.1 200 OK\r\nContent-type: text/html\r\n");
+    }
+}

src/Builder/ResponseBuilder.php

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+<?php
+
+namespace Http\Message\Builder;
+
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Fills response object with values.
+ */
+class ResponseBuilder
+{
+    /**
+     * The response to be built.
+     *
+     * @var ResponseInterface
+     */
+    protected $response;
+
+    /**
+     * Create builder for the given response.
+     *
+     * @param ResponseInterface $response
+     */
+    public function __construct(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * Return response.
+     *
+     * @return ResponseInterface
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+
+    /**
+     * Add headers represented by an array of header lines.
+     *
+     * @param string[] $headers Response headers as array of header lines.
+     *
+     * @return $this
+     *
+     * @throws \UnexpectedValueException For invalid header values.
+     * @throws \InvalidArgumentException For invalid status code arguments.
+     */
+    public function setHeadersFromArray(array $headers)
+    {
+        $statusLine = trim(array_shift($headers));
+        $parts = explode(' ', $statusLine, 3);
+        if (count($parts) < 2 || substr(strtolower($parts[0]), 0, 5) !== 'http/') {
+            throw new \UnexpectedValueException(
+                sprintf('"%s" is not a valid HTTP status line', $statusLine)
+            );
+        }
+
+        $reasonPhrase = count($parts) > 2 ? $parts[2] : '';
+        $this->response = $this->response
+            ->withStatus((int) $parts[1], $reasonPhrase)
+            ->withProtocolVersion(substr($parts[0], 5));
+
+        foreach ($headers as $headerLine) {
+            $headerLine = trim($headerLine);
+            if ('' === $headerLine) {
+                continue;
+            }
+
+            $parts = explode(':', $headerLine, 2);
+            if (count($parts) !== 2) {
+                throw new \UnexpectedValueException(
+                    sprintf('"%s" is not a valid HTTP header line', $headerLine)
+                );
+            }
+            $name = trim(urldecode($parts[0]));
+            $value = trim(urldecode($parts[1]));
+            if ($this->response->hasHeader($name)) {
+                $this->response = $this->response->withAddedHeader($name, $value);
+            } else {
+                $this->response = $this->response->withHeader($name, $value);
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add headers represented by a single string.
+     *
+     * @param string $headers Response headers as single string.
+     *
+     * @return $this
+     *
+     * @throws \InvalidArgumentException if $headers is not a string on object with __toString()
+     * @throws \UnexpectedValueException For invalid header values.
+     */
+    public function setHeadersFromString($headers)
+    {
+        if (!(is_string($headers)
+            || (is_object($headers) && method_exists($headers, '__toString')))
+        ) {
+            throw new \InvalidArgumentException(
+                sprintf(
+                    '%s expects parameter 1 to be a string, %s given',
+                    __METHOD__,
+                    is_object($headers) ? get_class($headers) : gettype($headers)
+                )
+            );
+        }
+
+        $this->setHeadersFromArray(explode("\r\n", $headers));
+
+        return $this;
+    }
+}