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<?php
namespace Corals\Modules\CMS\Classes;
use Corals\Modules\CMS\Contracts\MetaTags as MetaTagsContract;
use Illuminate\Config\Repository as Config;
class SEOMeta implements MetaTagsContract
{
/**
* The meta title.
*
* @var string
*/
protected $title;
/**
* The meta title session.
*
* @var string
*/
protected $title_session;
/**
* The meta title session.
*
* @var string
*/
protected $title_default;
/**
* The title tag separator.
*
* @var array
*/
protected $title_separator;
/**
* The meta description.
*
* @var string
*/
protected $description;
/**
* The meta keywords.
*
* @var array
*/
protected $keywords = [];
/**
* extra metatags.
*
* @var array
*/
protected $metatags = [];
/**
* The canonical URL.
*
* @var string
*/
protected $canonical;
/**
* The prev URL in pagination.
*
* @var string
*/
protected $prev;
/**
* The next URL in pagination.
*
* @var string
*/
protected $next;
/**
* The alternate languages.
*
* @var array
*/
protected $alternateLanguages = [];
/**
* @var Config
*/
protected $config;
/**
* The webmaster tags.
*
* @var array
*/
protected $webmasterTags = [
'google' => 'google-site-verification',
'bing' => 'msvalidate.01',
'alexa' => 'alexaVerifyID',
'pintrest' => 'p:domain_verify',
'yandex' => 'yandex-verification',
];
/**
* @param Config $config
*/
public function __construct(Config $config)
{
$this->config = $config;
}
/**
* Generates meta tags.
*
* @param bool $minify
*
* @return string
*/
public function generate($minify = false)
{
$this->loadWebMasterTags();
$title = $this->getTitle();
$description = $this->getDescription();
$keywords = $this->getKeywords();
$metatags = $this->getMetatags();
$canonical = $this->getCanonical();
$prev = $this->getPrev();
$next = $this->getNext();
$languages = $this->getAlternateLanguages();
$html = [];
if ($title) {
$html[] = "<title>$title</title>";
}
if ($description) {
$html[] = "<meta name=\"description\" content=\"{$description}\">";
}
if (!empty($keywords)) {
$keywords = implode(', ', $keywords);
$html[] = "<meta name=\"keywords\" content=\"{$keywords}\">";
}
foreach ($metatags as $key => $value) {
$name = $value[0];
$content = $value[1];
// if $content is empty jump to nest
if (empty($content)) {
continue;
}
$html[] = "<meta {$name}=\"{$key}\" content=\"{$content}\">";
}
if ($canonical) {
$html[] = "<link rel=\"canonical\" href=\"{$canonical}\"/>";
}
if ($prev) {
$html[] = "<link rel=\"prev\" href=\"{$prev}\"/>";
}
if ($next) {
$html[] = "<link rel=\"next\" href=\"{$next}\"/>";
}
foreach ($languages as $lang) {
$html[] = "<link rel=\"alternate\" hreflang=\"{$lang['lang']}\" href=\"{$lang['url']}\"/>";
}
return ($minify) ? implode('', $html) : implode(PHP_EOL, $html);
}
/**
* Sets the title.
*
* @param string $title
* @param bool $appendDefault
*
* @return MetaTagsContract
*/
public function setTitle($title, $appendDefault = true)
{
// clean title
$title = strip_tags($title);
// store title session
$this->title_session = $title;
// store title
if (true === $appendDefault) {
$this->title = $this->parseTitle($title);
} else {
$this->title = $title;
}
return $this;
}
/**
* Sets the default title tag.
*
* @param string $default
*
* @return MetaTagsContract
*/
public function setTitleDefault($default)
{
$this->title_default = $default;
return $this;
}
/**
* Sets the separator for the title tag.
*
* @param string $separator
*
* @return MetaTagsContract
*/
public function setTitleSeparator($separator)
{
$this->title_separator = $separator;
return $this;
}
/**
* @param string $description
*
* @return MetaTagsContract
*/
public function setDescription($description)
{
// clean and store description
// if is false, set false
$this->description = (false == $description) ? $description : strip_tags(htmlentities($description,ENT_COMPAT, 'UTF-8'));
return $this;
}
/**
* Sets the list of keywords, you can send an array or string separated with commas
* also clears the previously set keywords.
*
* @param string|array $keywords
*
* @return MetaTagsContract
*/
public function setKeywords($keywords)
{
if (!is_array($keywords)) {
$keywords = explode(', ', $keywords);
}
// clean keywords
$keywords = array_map('strip_tags', $keywords);
// store keywords
$this->keywords = $keywords;
return $this;
}
/**
* Add a keyword.
*
* @param string|array $keyword
*
* @return MetaTagsContract
*/
public function addKeyword($keyword)
{
if (is_array($keyword)) {
$this->keywords = array_merge($keyword, $this->keywords);
} else {
$this->keywords[] = strip_tags($keyword);
}
return $this;
}
/**
* Remove a metatag.
*
* @param string $key
*
* @return MetaTagsContract
*/
public function removeMeta($key)
{
\Arr::forget($this->metatags, $key);
return $this;
}
/**
* Add a custom meta tag.
*
* @param string|array $meta
* @param string $value
* @param string $name
*
* @return MetaTagsContract
*/
public function addMeta($meta, $value = null, $name = 'name')
{
// multiple metas
if (is_array($meta)) {
foreach ($meta as $key => $value) {
$this->metatags[$key] = [$name, $value];
}
} else {
$this->metatags[$meta] = [$name, $value];
}
return $this;
}
/**
* Sets the canonical URL.
*
* @param string $url
*
* @return MetaTagsContract
*/
public function setCanonical($url)
{
$this->canonical = $url;
return $this;
}
/**
* Sets the prev URL.
*
* @param string $url
*
* @return MetaTagsContract
*/
public function setPrev($url)
{
$this->prev = $url;
return $this;
}
/**
* Sets the next URL.
*
* @param string $url
*
* @return MetaTagsContract
*/
public function setNext($url)
{
$this->next = $url;
return $this;
}
/**
* Add an alternate language.
*
* @param string $lang language code in ISO 639-1 format
* @param string $url
*
* @return MetaTagsContract
*/
public function addAlternateLanguage($lang, $url)
{
$this->alternateLanguages[] = ['lang' => $lang, 'url' => $url];
return $this;
}
/**
* Add alternate languages.
*
* @param array $languages
*
* @return MetaTagsContract
*/
public function addAlternateLanguages(array $languages)
{
$this->alternateLanguages = array_merge($this->alternateLanguages, $languages);
return $this;
}
/**
* Takes the title formatted for display.
*
* @return string
*/
public function getTitle()
{
return $this->title ?: $this->getDefaultTitle();
}
/**
* Takes the default title.
*
* @return string
*/
public function getDefaultTitle()
{
if (empty($this->title_default)) {
return $this->config->get('defaults.title', null);
}
return $this->title_default;
}
/**
* takes the title that was set.
*
* @return string
*/
public function getTitleSession()
{
return $this->title_session ?: $this->getTitle();
}
/**
* takes the title that was set.
*
* @return string
*/
public function getTitleSeparator()
{
return $this->title_separator ?: $this->config->get('defaults.separator', ' - ');
}
/**
* Get the Meta keywords.
*
* @return array
*/
public function getKeywords()
{
return $this->keywords ?: $this->config->get('defaults.keywords', []);
}
/**
* Get all metatags.
*
* @return array
*/
public function getMetatags()
{
return $this->metatags;
}
/**
* Get the Meta description.
*
* @return string|null
*/
public function getDescription()
{
if (false === $this->description) {
return;
}
return $this->description ?: $this->config->get('defaults.description', null);
}
/**
* Get the canonical URL.
*
* @return string
*/
public function getCanonical()
{
$canonical_config = $this->config->get('defaults.canonical', false);
return $this->canonical ?: (($canonical_config === null) ? app('url')->current() : $canonical_config);
}
/**
* Get the prev URL.
*
* @return string
*/
public function getPrev()
{
return $this->prev;
}
/**
* Get the next URL.
*
* @return string
*/
public function getNext()
{
return $this->next;
}
/**
* Get alternate languages.
*
* @return array
*/
public function getAlternateLanguages()
{
return $this->alternateLanguages;
}
/**
* Reset all data.
*
* @return void
*/
public function reset()
{
$this->description = null;
$this->title_session = null;
$this->next = null;
$this->prev = null;
$this->canonical = null;
$this->metatags = [];
$this->keywords = [];
$this->alternateLanguages = [];
$this->canonical = null;
}
/**
* Get parsed title.
*
* @param string $title
*
* @return string
*/
protected function parseTitle($title)
{
$default = $this->getDefaultTitle();
return (empty($default)) ? $title : $title . $this->getTitleSeparator() . $default;
}
/**
* Load webmaster tags from configuration.
*/
protected function loadWebMasterTags()
{
foreach ($this->config->get('webmaster_tags', []) as $name => $value) {
if (!empty($value)) {
$meta = \Arr::get($this->webmasterTags, $name, $name);
$this->addMeta($meta, $value);
}
}
}
}