Wordpress Local Gravatar cache

我喜欢的人头像显示在我的博客评论谁. WordPress的支持的gravatar服务本身因此启用，这是很容易. 然而，它是有代价 - 从另一个域访问外部文件中增加了许多额外的加载时间的新形式 DNS 查找, 新 SSL 连接使, 等等. Wouldn’t it be nice to have gravatars stored locally and served from your own server. 嗯，这就是我一直在做了一段时间, 如果你想知道如何, 阅读...

In case you’re still wondering just why you’d want to do this, let me offer a few more benefits — images served locally can be compressed before serving them, for example ‑all my images are converted into webp versions, and any browser which supports webp gets the webp version. This is in addition to the reduction from not having to connect to an external server. The local resources can also have a caching header set on them so that browsers will cache them. Gravatar doesn’t provide for a very long cache time.

I have created 3 custom functions, 我只是把我的主题的functions.php文件. The first is a custom filter for the native wordpress get_avatar(). 从的gravatar和谷歌的第二争夺化身呼吁时, and the third creates a daily cronjob which refreshes the gravatars — in case they’ve been changed, or a previously unavailable one is now available.

You will need to do a little bit of tinkering to make it compatible with your theme — I use the “bones” framework as you’ll notice in the 3^RD function I’ve reused some code that it provided. You will also need to create, or customise the path to store the gravatars, which in my case are stored in the theme folder in the subpath “/library/images/gravatars/”

/*********************************************\
* Filter get_avatar to use local avatars only *
\*********************************************/
function bones_gravatar($avatar, $id_or_email, $size, $default, $alt)
{
$root_path= get_template_directory_uri() . '/library/images/gravatars/';
$root_path_local= get_template_directory() . '/library/images/gravatars/';
$gravatar_path= $root_path . 'default_avatar';
$gravatar_path_hidpi= 'data-gravatar-hidpi="'.$root_path . 'default_avatar-hidpi.png"';

//shamelessly reuse original code to get the e-mail address

$email = '';
if ( is_numeric($id_or_email) )
{
$id = (int) $id_or_email;
$user = get_userdata($id);
if ( $user ) $email = $user->user_email;
}
elseif ( is_object($id_or_email) )
{
// No avatar for pingbacks or trackbacks
$allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) );
if ( ! empty( $id_or_email->comment_type ) && ! in_array( $id_or_email->comment_type, (array) $allowed_comment_types ) ) return false;
if ( !empty($id_or_email->user_id) )
{
$id = (int) $id_or_email->user_id;
$user = get_userdata($id);
if ( $user) $email = $user->user_email;
}
elseif ( !empty($id_or_email->comment_author_email) )
{
$email = $id_or_email->comment_author_email;
}
}
else
{
$email = $id_or_email;
}

if ( !empty($email) )
{
$email_hash = md5( strtolower( trim( $email ) ) );
if(file_exists($root_path_local . $email_hash . '.png'))
{
//if we have a local cache then use it
$gravatar_path= $root_path . $email_hash ;
$gravatar_path_hidpi= 'data-gravatar-hidpi="'.$root_path . $email_hash . '-hidpi.png"';
}
}
if($size >= 47) $avatar= '<img class="load-gravatar avatar avatar-'.$size.' photo" width="'.$size.'" height="'.$size.'" src="' . $gravatar_path . '-hidpi.png" alt="gravatar" />';
else $avatar= '<img class="load-gravatar avatar avatar-'.$size.' photo" width="'.$size.'" height="'.$size.'" src="' . $gravatar_path . '.png" alt="gravatar" ' . $gravatar_path_hidpi . ' />';

return $avatar;
}

add_filter('get_avatar', 'bones_gravatar', 10, 5);






/***********************\
* Create gravatar cache *
\***********************/
function grab_avatar($comment_id,$comment,$refresh=false,$email='')
{
usleep(20);
$root_path= get_template_directory_uri() . '/library/images/gravatars/';
$root_path_local= get_template_directory() . '/library/images/gravatars/';
if($refresh==false) $img_name= md5( get_comment_author_email($comment_id) );
else $img_name= md5( $email );
if(!file_exists($root_path_local . $img_name . '.png') || $refresh==true)
{
if($refresh==false) $bgauthemail = get_comment_author_email();
else $bgauthemail= $email;
//try google first
$domain= explode("@",$bgauthemail);
if($domain[1]=="gmail.com")
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, "http://picasaweb.google.com/data/entry/api/user/" . $bgauthemail . "?alt=json");
$result = curl_exec($ch);
curl_close($ch);

$obj = json_decode($result,true);
$avatar_from_gmail= $obj['entry']['gphoto$thumbnail']['$t'];

$extension= strrchr($avatar_from_gmail, '.');

$ch = curl_init($avatar_from_gmail);
curl_setopt( $ch, CURLOPT_NOBODY, true );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, false );
curl_setopt( $ch, CURLOPT_HEADER, false );
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );
curl_setopt( $ch, CURLOPT_MAXREDIRS, 3 );
curl_exec( $ch );
$headers = curl_getinfo( $ch );
curl_close( $ch );
if($headers['http_code'] === 200)
{
$ch = curl_init($avatar_from_gmail);
$fp = fopen($root_path_local . $img_name . '-hidpi' . $extension, 'wb');
curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.62 Safari/537.36');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);
curl_close($ch);

fclose($fp);

$usegravatar=false;

$small_image= wp_get_image_editor($root_path_local . $img_name . '-hidpi' . $extension);
if ( ! is_wp_error( $small_image ) )
{
//check it isn't a blank man image, if so, delete it
if (md5_file($root_path_local . $img_name . '-hidpi.jpg') == strtolower("686E5C46776BA0E5C488853C1C0B492C"))
{
//delete
unlink($root_path_local . $img_name . '-hidpi.jpg');
//try gravatar
$usegravatar=true;
}
else if (md5_file($root_path_local . $img_name . '-hidpi.jpg') == strtolower("6D4083BE95FB32358A5110F5A83B9979"))
{
//delete
unlink($root_path_local . $img_name . '-hidpi.jpg');
//try gravatar
$usegravatar=true;
}
else
{
//always convert to png because some plugins expect all gravatars to be pngs
$small_image->save($root_path_local . $img_name . '-hidpi.png','image/png');
$small_image->resize(40, 40, true);
$small_image->set_quality( 10 );
$small_image->save($root_path_local . $img_name . '.png','image/png');
if($extension==".jpg") unlink($root_path_local . $img_name . '-hidpi.jpg');
}
}
}

}
//check e-mail isnt a blank generic one
else if($bgauthemail!=="noemail@intensedebate.com" || $usegravatar==true)
{
$avatar_from_gravatar= "https://www.gravatar.com/avatar/" . $img_name . "?s=80&d=404";
$ch = curl_init($avatar_from_gravatar);
curl_setopt( $ch, CURLOPT_NOBODY, true );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, false );
curl_setopt( $ch, CURLOPT_HEADER, false );
curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );
curl_setopt( $ch, CURLOPT_MAXREDIRS, 3 );
curl_exec( $ch );
$headers = curl_getinfo( $ch );
curl_close( $ch );
if($headers['http_code'] === 200)
{
$ch = curl_init($avatar_from_gravatar);
$fp = fopen($root_path_local . $img_name . '-hidpi.png', 'wb');
curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.62 Safari/537.36');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);
curl_close($ch);

fclose($fp);

$small_image= wp_get_image_editor($root_path_local . $img_name . '-hidpi.png');
if ( ! is_wp_error( $small_image ) )
{
$small_image->resize(40, 40, true);
$small_image->save($root_path_local . $img_name . '.png');
}
}
}
}
}
add_action('wp_insert_comment', 'grab_avatar');






/********************************************\
* Refresh gravatar cache in background daily *
\********************************************/
add_action( 'wp', 'bones_setup_schedule' );
function bones_setup_schedule() {
if ( ! wp_next_scheduled( 'bones_daily_event' ) ) {
wp_schedule_event( time(), 'daily', 'bones_daily_event');
}
}

add_action( 'bones_daily_event', 'bones_refresh_gravatars' );
function bones_refresh_gravatars()
{
//get list of gravatars somehow
global $wpdb;
$comment_author_emails= $wpdb->get_results( "SELECT DISTINCT(comment_author_email) FROM " . $wpdb->prefix . "comments" );
foreach($comment_author_emails as $key => $val)
{
foreach($val as $a => $b)
{
grab_avatar('','',true,$b);
}
}
}

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/*********************************************\

* Filter get_avatar to use local avatars only *

\*********************************************/

function bones_gravatar($avatar, $id_or_email, $size, $default, $alt)

{

$root_path= get_template_directory_uri() . '/library/images/gravatars/';

$root_path_local= get_template_directory() . '/library/images/gravatars/';

$gravatar_path= $root_path . 'default_avatar';

$gravatar_path_hidpi= 'data-gravatar-hidpi="'.$root_path . 'default_avatar-hidpi.png"';

//shamelessly reuse original code to get the e-mail address

$email = '';

if ( is_numeric($id_or_email) )

{

$id = (int) $id_or_email;

$user = get_userdata($id);

if ( $user ) $email = $user->user_email;

}

elseif ( is_object($id_or_email) )

{

// No avatar for pingbacks or trackbacks

$allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) );

if ( ! empty( $id_or_email->comment_type ) && ! in_array( $id_or_email->comment_type, (array) $allowed_comment_types ) ) return false;

if ( !empty($id_or_email->user_id) )

{

$id = (int) $id_or_email->user_id;

$user = get_userdata($id);

if ( $user) $email = $user->user_email;

}

elseif ( !empty($id_or_email->comment_author_email) )

{

$email = $id_or_email->comment_author_email;

}

else

{

$email = $id_or_email;

}

if ( !empty($email) )

{

$email_hash = md5( strtolower( trim( $email ) ) );

if(file_exists($root_path_local . $email_hash . '.png'))

{

//if we have a local cache then use it

$gravatar_path= $root_path . $email_hash ;

$gravatar_path_hidpi= 'data-gravatar-hidpi="'.$root_path . $email_hash . '-hidpi.png"';

}

if($size >= 47) $avatar= '<img class="load-gravatar avatar avatar-'.$size.' photo" width="'.$size.'" height="'.$size.'" src="' . $gravatar_path . '-hidpi.png" alt="gravatar" />';

else $avatar= '<img class="load-gravatar avatar avatar-'.$size.' photo" width="'.$size.'" height="'.$size.'" src="' . $gravatar_path . '.png" alt="gravatar" ' . $gravatar_path_hidpi . ' />';

return $avatar;

}

add_filter('get_avatar', 'bones_gravatar', 10, 5);

/***********************\

* Create gravatar cache *

\***********************/

function grab_avatar($comment_id,$comment,$refresh=false,$email='')

{

usleep(20);

$root_path= get_template_directory_uri() . '/library/images/gravatars/';

$root_path_local= get_template_directory() . '/library/images/gravatars/';

if($refresh==false) $img_name= md5( get_comment_author_email($comment_id) );

else $img_name= md5( $email );

if(!file_exists($root_path_local . $img_name . '.png') || $refresh==true)

{

if($refresh==false) $bgauthemail = get_comment_author_email();

else $bgauthemail= $email;

//try google first

$domain= explode("@",$bgauthemail);

if($domain[1]=="gmail.com")

{

$ch = curl_init();

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_URL, "http://picasaweb.google.com/data/entry/api/user/" . $bgauthemail . "?alt=json");

$result = curl_exec($ch);

curl_close($ch);

$obj = json_decode($result,true);

$avatar_from_gmail= $obj['entry']['gphoto$thumbnail']['$t'];

$extension= strrchr($avatar_from_gmail, '.');

$ch = curl_init($avatar_from_gmail);

curl_setopt( $ch, CURLOPT_NOBODY, true );

curl_setopt( $ch, CURLOPT_RETURNTRANSFER, false );

curl_setopt( $ch, CURLOPT_HEADER, false );

curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );

curl_setopt( $ch, CURLOPT_MAXREDIRS, 3 );

curl_exec( $ch );

$headers = curl_getinfo( $ch );

curl_close( $ch );

if($headers['http_code'] === 200)

{

$ch = curl_init($avatar_from_gmail);

$fp = fopen($root_path_local . $img_name . '-hidpi' . $extension, 'wb');

curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.62 Safari/537.36');

curl_setopt($ch, CURLOPT_FILE, $fp);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);

curl_close($ch);

fclose($fp);

$usegravatar=false;

$small_image= wp_get_image_editor($root_path_local . $img_name . '-hidpi' . $extension);

if ( ! is_wp_error( $small_image ) )

{

//check it isn't a blank man image, if so, delete it

if (md5_file($root_path_local . $img_name . '-hidpi.jpg') == strtolower("686E5C46776BA0E5C488853C1C0B492C"))

{

//delete

unlink($root_path_local . $img_name . '-hidpi.jpg');

//try gravatar

$usegravatar=true;

}

else if (md5_file($root_path_local . $img_name . '-hidpi.jpg') == strtolower("6D4083BE95FB32358A5110F5A83B9979"))

{

//delete

unlink($root_path_local . $img_name . '-hidpi.jpg');

//try gravatar

$usegravatar=true;

}

else

{

//always convert to png because some plugins expect all gravatars to be pngs

$small_image->save($root_path_local . $img_name . '-hidpi.png','image/png');

$small_image->resize(40, 40, true);

$small_image->set_quality( 10 );

$small_image->save($root_path_local . $img_name . '.png','image/png');

if($extension==".jpg") unlink($root_path_local . $img_name . '-hidpi.jpg');

}

//check e-mail isnt a blank generic one

else if($bgauthemail!=="noemail@intensedebate.com" || $usegravatar==true)

{

$avatar_from_gravatar= "https://www.gravatar.com/avatar/" . $img_name . "?s=80&d=404";

$ch = curl_init($avatar_from_gravatar);

curl_setopt( $ch, CURLOPT_NOBODY, true );

curl_setopt( $ch, CURLOPT_RETURNTRANSFER, false );

curl_setopt( $ch, CURLOPT_HEADER, false );

curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );

curl_setopt( $ch, CURLOPT_MAXREDIRS, 3 );

curl_exec( $ch );

$headers = curl_getinfo( $ch );

curl_close( $ch );

if($headers['http_code'] === 200)

{

$ch = curl_init($avatar_from_gravatar);

$fp = fopen($root_path_local . $img_name . '-hidpi.png', 'wb');

curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.62 Safari/537.36');

curl_setopt($ch, CURLOPT_FILE, $fp);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);

curl_close($ch);

fclose($fp);

$small_image= wp_get_image_editor($root_path_local . $img_name . '-hidpi.png');

if ( ! is_wp_error( $small_image ) )

{

$small_image->resize(40, 40, true);

$small_image->save($root_path_local . $img_name . '.png');

}

add_action('wp_insert_comment', 'grab_avatar');

/********************************************\

* Refresh gravatar cache in background daily *

\********************************************/

add_action( 'wp', 'bones_setup_schedule' );

function bones_setup_schedule() {

if ( ! wp_next_scheduled( 'bones_daily_event' ) ) {

wp_schedule_event( time(), 'daily', 'bones_daily_event');

}

add_action( 'bones_daily_event', 'bones_refresh_gravatars' );

function bones_refresh_gravatars()

{

//get list of gravatars somehow

global $wpdb;

$comment_author_emails= $wpdb->get_results( "SELECT DISTINCT(comment_author_email) FROM " . $wpdb->prefix . "comments" );

foreach($comment_author_emails as $key => $val)

{

foreach($val as $a => $b)

{

grab_avatar('','',true,$b);

}

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