Ticket 600: Adding link tags dynamically

http://redmine.ilch2.de/issues/600

application/libraries/Ilch/Layout/Frontend.php

@@ -138,6 +138,53 @@ public function getMetaTagString($key)
         }
     }
 
+    /**
+     * Get the link tag as string.
+     *
+     * @param $key
+     * @return string
+     */
+    public function getLinkTagString($key)
+    {
+        $linkTagModel = $this->get('linkTags')[$key];
+
+        // If the rel attribute is absent, has no keywords, or if none of the keywords used are allowed according
+        // to the definitions in this specification, then the element does not create any links.
+        // The href attribute must be present and must contain a valid non-empty URL potentially surrounded by spaces.
+        // If the href attribute is absent, then the element does not define a link.
+        if (empty($linkTagModel->getRel()) || empty($linkTagModel->getHref())) {
+            return "";
+        }
+
+        $linkTagString = sprintf('<link rel="%s" href="%s"', $this->escape($linkTagModel->getRel()), $this->escape($linkTagModel->getHref()));
+
+        if ($linkTagModel->getCrossorigin()) {
+            $linkTagString = $linkTagString . sprintf(' crossorigin="%s"', $this->escape($linkTagModel->getCrossorigin()));
+        }
+
+        if ($linkTagModel->getHreflang()) {
+            $linkTagString = $linkTagString . sprintf(' hreflang="%s"', $this->escape($linkTagModel->getHreflang()));
+        }
+
+        if ($linkTagModel->getSizes()) {
+            $linkTagString = $linkTagString . sprintf(' sizes="%s"', $this->escape($linkTagModel->getSizes()));
+        }
+
+        if ($linkTagModel->getType()) {
+            $linkTagString = $linkTagString . sprintf(' type="%s"', $this->escape($linkTagModel->getType()));
+        }
+
+        if ($linkTagModel->getMedia()) {
+            $linkTagString = $linkTagString . sprintf(' media="%s"', $this->escape($linkTagModel->getMedia()));
+        }
+
+        if ($linkTagModel->getTitle()) {
+            $linkTagString = $linkTagString . sprintf(' title="%s"', $this->escape($linkTagModel->getTitle()));
+        }
+
+        return $linkTagString . '>';
+    }
+
     /**
      * Get key from config.
      *
@@ -211,6 +258,13 @@ public function getHeader()
             }
         }
 
+        if (is_array($this->get('linkTags'))) {
+            foreach ($this->get('linkTags') as $key => $linkTag) {
+                $html .= '
+                '.$this->getLinkTagString($key);
+            }
+        }
+
         $html .= '
                 <link rel="apple-touch-icon" href="'.$this->getBaseUrl($this->escape($this->getAppleIcon())).'">
                 <link href="'.$this->getVendorUrl('fortawesome/font-awesome/css/all.min.css').'" rel="stylesheet">

application/libraries/Ilch/Layout/Helper/LinkTag/Model.php

@@ -0,0 +1,277 @@
+<?php
+/**
+ * @copyright Ilch 2.0
+ * @package ilch
+ */
+
+namespace Ilch\Layout\Helper\LinkTag;
+
+use Ilch\Layout\Base as Layout;
+
+/**
+ * A model for a link tag.
+ *
+ * @see https://www.w3.org/TR/html50/document-metadata.html#the-link-element
+ */
+class Model
+{
+    /**
+     * The href of the link tag.
+     * Address of the hyperlink
+     * Must be present and must contain a valid non-empty URL potentially surrounded by spaces.
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-href
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * The crossorigin of the link tag.
+     * How the element handles crossorigin requests
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-crossorigin
+     * @var string
+     */
+    protected $crossorigin;
+
+    /**
+     * The rel of the link tag.
+     * Relationship between the document containing the hyperlink and the destination resource
+     * A link element must have a rel attribute.
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-rel
+     * @var string
+     */
+    protected $rel;
+
+    /**
+     * The media of the link tag.
+     * Applicable media
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-media
+     * @var string
+     */
+    protected $media;
+
+    /**
+     * The hreflang of the link tag.
+     * Language of the linked resource
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-hreflang
+     * @var string
+     */
+    protected $hreflang;
+
+    /**
+     * The type of the link tag.
+     * Hint for the type of the referenced resource
+     * The type attribute gives the MIME type of the linked resource. It is purely advisory.
+     * The value must be a valid MIME type.
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-type
+     * @var string
+     */
+    protected $type;
+
+    /**
+     * The sizes of the link tag.
+     * Sizes of the icons (for rel="icon")
+     *
+     * @see https://www.w3.org/TR/html50/links.html#attr-link-sizes
+     * @var string
+     */
+    protected $sizes;
+
+    /**
+     * The title of the link tag.
+     * title attribute has special semantics on this element: Title of the link; alternative style sheet set name.
+     *
+     * @see https://www.w3.org/TR/html50/document-metadata.html#attr-link-title
+     * @var string
+     */
+    protected $title;
+
+    /**
+     * Set href for the link tag.
+     *
+     * @param string $href
+     * @return Model
+     */
+    public function setHref($href)
+    {
+        $this->href = $href;
+        return $this;
+    }
+
+    /**
+     * Get href for the link tag.
+     * @return string
+     */
+    public function getHref()
+    {
+        return $this->href;
+    }
+
+    /**
+     * Set crossorigin for the link tag.
+     * Example: anonymous, use-credentials, ...
+     *
+     * @param string $crossorigin
+     * @return Model
+     */
+    public function setCrossorigin($crossorigin)
+    {
+        $this->crossorigin = $crossorigin;
+        return $this;
+    }
+
+    /**
+     * Get crossorigin for the link tag.
+     *
+     * @return string
+     */
+    public function getCrossorigin()
+    {
+        return $this->crossorigin;
+    }
+
+    /**
+     * Set rel for the link tag.
+     * Example: alternate, stylesheet, ...
+     *
+     * @param string $rel
+     * @return Model
+     */
+    public function setRel($rel)
+    {
+        $this->rel = $rel;
+        return $this;
+    }
+
+    /**
+     * Get rel for the link tag.
+     *
+     * @return string
+     */
+    public function getRel()
+    {
+        return $this->rel;
+    }
+
+    /**
+     * Set the media for the link tag.
+     * The value must be a valid media query.
+     * Example: print
+     *
+     * @param string $media
+     * @return Model
+     */
+    public function setMedia($media)
+    {
+        $this->media = $media;
+        return $this;
+    }
+
+    /**
+     * Get the media for the link tag.
+     *
+     * @return string
+     */
+    public function getMedia()
+    {
+        return $this->media;
+    }
+
+    /**
+     * Set hreflang for the link tag.
+     * The value must be a valid BCP 47 language tag.
+     * Example: en, fr, ...
+     *
+     * @param string $hreflang
+     * @return Model
+     */
+    public function setHreflang($hreflang)
+    {
+        $this->hreflang = $hreflang;
+        return $this;
+    }
+
+    /**
+     * Get hreflang for the link tag.
+     *
+     * @return string
+     */
+    public function getHreflang()
+    {
+        return $this->hreflang;
+    }
+
+    /**
+     * Set the type for the link tag.
+     * The value must be a valid MIME type.
+     * Example: text/html, application/pdf, ...
+     *
+     * @param string $type
+     * @return Model
+     */
+    public function setType($type)
+    {
+        $this->type = $type;
+        return $this;
+    }
+
+    /**
+     * Get the type for the link tag.
+     *
+     * @return string
+     */
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    /**
+     * Set sizes for the link tag.
+     * Example: 16x16, 32x32, any, ...
+     *
+     * @param string $sizes
+     * @return Model
+     */
+    public function setSizes($sizes)
+    {
+        $this->sizes = $sizes;
+        return $this;
+    }
+
+    /**
+     * Get sizes for the link tag.
+     *
+     * @return string
+     */
+    public function getSizes()
+    {
+        return $this->sizes;
+    }
+
+    /**
+     * Set title for the link tag.
+     *
+     * @param string $title
+     * @return Model
+     */
+    public function setTitle($title)
+    {
+        $this->title = $title;
+        return $this;
+    }
+
+    /**
+     * Get title for the link tag.
+     *
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+}

application/libraries/Ilch/Layout/Helper/MetaTag/Model.php

@@ -146,4 +146,4 @@ public function setCharset($charset)
 
         return $this;
     }
-}
+}