12. April 2016

Cross browser audio/video/screen recording via webRTC – MediaStreamRecorder

MediaStreamRecorder.js is a cross-browser implementation to record audio & video streams via WebRTC. The lib allows you to submit/upload recorded blobs in realtime to your server.

Record audio+video in Chrome

<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>
<script>
var mediaConstraints = {
    audio: true,
    video: true
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var multiStreamRecorder = new MultiStreamRecorder(stream);
    multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy
    multiStreamRecorder.audioChannels = 1;
    multiStreamRecorder.ondataavailable = function (blobs) {
        // blobs.audio
        // blobs.video
    };
    multiStreamRecorder.start(3 * 1000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</script>

var mediaConstraints = {

audio: true,

video: true

};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {

var multiStreamRecorder = new MultiStreamRecorder(stream);

multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy

multiStreamRecorder.audioChannels = 1;

multiStreamRecorder.ondataavailable = function (blobs) {

// blobs.audio

// blobs.video

};

multiStreamRecorder.start(3 * 1000);

}

function onMediaError(e) {

console.error('media error', e);

}

</script>

Uploading and receiving via PHP

<?php
foreach(array('video', 'audio') as $type) {
    if (isset($_FILES["${type}-blob"])) {

        $fileName = $_POST["${type}-filename"];
        $uploadDirectory = "uploads/$fileName";

        if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {
            echo("problem moving uploaded file");
        }

        echo($uploadDirectory);
    }
}
?>

<?php

foreach(array('video', 'audio') as $type) {

if (isset($_FILES["${type}-blob"])) {

$fileName = $_POST["${type}-filename"];

$uploadDirectory = "uploads/$fileName";

if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {

echo("problem moving uploaded file");

}

echo($uploadDirectory);

}

API documentation / GitHub

2. April 2016

Dragging like a Pro with Dragdealer.js

Dragdealer.js is a drag-based JavaScript component, embracing endless UI solutions.

The lib provides a huge amount of options to use it for a multitude of functions.

GitHub

24. März 2016

Code snippet manager for GitHub Gists –

„Gisto is a code snippet manager that runs on GitHub Gists and adds additional features such as searching, tagging and sharing gists while including a rich code editor. All your data is stored on GitHub and you can access it from GitHub Gists at any time with changes carrying over to Gisto.“

The application is multi-platform.

Gisto

16. März 2016

Multifunctional floating panels with jsPanel

jsPanel are multifunctional floating panels, that can also be used as a simple modal or tooltip. Panels can be minimized and maximized and have a huge amount of options.

Really impressive projectand well documented.

API / Examples & Github

16. März 2016

Use Boba.js to make work with Google Analytics easier

„Boba.js is a small, easily extensible JavaScript library that makes working with Google Analytics easier.“

tracker = new Boba

tracker = new Boba({
  siteName: 'Mandalore',
  pageName: 'Slave I',
  defaultCategory: 'category',
  defaultAction: 'action',
  defaultLabel: 'label',
  watch: [
    ['click', '.js-track-solo', trackSolo],
    ['click', '.js-track-chewie', trackChewie]
  ]
})

tracker = new Boba

tracker = new Boba({

siteName: 'Mandalore',

pageName: 'Slave I',

defaultCategory: 'category',

defaultAction: 'action',

defaultLabel: 'label',

watch: [

['click', '.js-track-solo', trackSolo],

['click', '.js-track-chewie', trackChewie]

]

})

Boba.js

10. März 2016

JSON Formatter & Validator

JSON Formatter & Validator helps debugging JSON data, either data you wrote by hand or data that has been output in one compact line :)

JSON Formatter & Validator

6. März 2016

You can touch this – Hammer.js

Hammer.js helps you add support for touch gestures and removes the 300ms delay from clicks.

Hammer.js

3. März 2016

Generic Syntax Highlighting with Regular Expressions in pure PHP

Due to Google AMP (Accelerated Mobile Pages) , I have been looking for a way to effectively do Syntax Highlighting without Javascript in pure PHP.

I was about to write my own, when I found an older article from phoboslab. Thanks Dominic for saving me some time ;) Its not perfect, but close enough.

A simple Syntax Highlighting Class that does just that. The class was not working with PHP 5.4.x+, as it uses preg_replace() with the /e modifier.

It will not cover all, but its better than nothing :) I will also add a section to my my AMP tweaks article to showcase the integration of Geshi.

Here an updated version using the preg_replace_callback() function.

THE SYNTAX HIGHLIGHT CLASS

class SyntaxHighlight {
   
    static $tokens = array();// This array will be filled from the regexp-callback

    public static function process($s) {
        $s = htmlspecialchars($s);

        // Workaround for escaped backslashes
        $s = str_replace('\\\\','\\\\<e>', $s); 

        $regexp = array(

            // Punctuations
            '/([\-\!\%\^\*\(\)\+\|\~\=`\{\}\[\]\:\"\'<>\?\,\.\/]+)/'
            => '<span class="P">$1</span>',

            // Numbers (also look for Hex)
            '/(?<!\w)(
                (0x|\#)[\da-f]+|
                \d+|
                \d+(px|em|cm|mm|rem|s|\%)
            )(?!\w)/ix'
            => '<span class="N">$1</span>',

            // Make the bold assumption that an
            // all uppercase word has a special meaning
            '/(?<!\w|>|\#)(
                [A-Z_0-9]{2,}
            )(?!\w)/x'
            => '<span class="D">$1</span>',

            // Keywords
            '/(?<!\w|\$|\%|\@|>)(
                and|or|xor|for|do|while|foreach|as|return|die|exit|if|then|else|
                elseif|new|delete|try|throw|catch|finally|class|function|string|
                array|object|resource|var|bool|boolean|int|integer|float|double|
                real|string|array|global|const|static|public|private|protected|
                published|extends|switch|true|false|null|void|this|self|struct|
                char|signed|unsigned|short|long
            )(?!\w|=")/ix'
            => '<span class="K">$1</span>',

            // PHP/Perl-Style Vars: $var, %var, @var
            '/(?<!\w)(
                (\$|\%|\@)(\->|\w)+
            )(?!\w)/ix'
            => '<span class="V">$1</span>'

        );      
	
        $s = preg_replace_callback( '/(
                \/\*.*?\*\/|
                \/\/.*?\n|
                \#.[^a-fA-F0-9]+?\n|
                \<\!\-\-[\s\S]+\-\-\>|
                (?<!\\\)&quot;.*?(?<!\\\)&quot;|
                (?<!\\\)\'(.*?)(?<!\\\)\'
            )/isx' , array('SyntaxHighlight', 'replaceId'),$s);
			
        $s = preg_replace(array_keys($regexp), array_values($regexp), $s);

        // Paste the comments and strings back in again
        $s = str_replace(array_keys(SyntaxHighlight::$tokens), array_values(SyntaxHighlight::$tokens), $s);

        // Delete the "Escaped Backslash Workaround Token" (TM)
        // and replace tabs with four spaces.
        $s = str_replace(array('<e>', "\t"), array('', '    '), $s);

        return '<pre>'.$s.'</pre>' ;
    }

    // Regexp-Callback to replace every comment or string with a uniqid and save
    // the matched text in an array
    // This way, strings and comments will be stripped out and wont be processed
    // by the other expressions searching for keywords etc.
     static function replaceId($match) {
        $id = "##r" . uniqid() . "##";
	
        // String or Comment?
        if(substr($match[1], 0, 2) == '//' || substr($match[1], 0, 2) == '/*' || substr($match[1], 0, 2) == '##' || substr($match[1], 0, 7) == '<!--') {
            SyntaxHighlight::$tokens[$id] = '<span class="C">' . $match[1] . '</span>';
        } else {
           SyntaxHighlight::$tokens[$id] = '<span class="S">' . $match[1] . '</span>';
        }
		
        return $id;
    }
}

class SyntaxHighlight {

static $tokens = array();// This array will be filled from the regexp-callback

public static function process($s) {

$s = htmlspecialchars($s);

// Workaround for escaped backslashes

$s = str_replace('\\\\','\\\\<e>', $s);

$regexp = array(

// Punctuations

'/([\-\!\%\^\*\+\|\~\=`\{\}\[\]\:\"\'<>\?\,\.\/]+)/'

=> '$1',

// Numbers (also look for Hex)

'/(?<!\w)(

(0x|\#)[\da-f]+|

\d+|

\d+(px|em|cm|mm|rem|s|\%)

)(?!\w)/ix'

=> '$1',

// Make the bold assumption that an

// all uppercase word has a special meaning

'/(?<!\w|>|\#)(

[A-Z_0-9]{2,}

)(?!\w)/x'

=> '$1',

// Keywords

'/(?<!\w|\$|\%|\@|>)(

and|or|xor|for|do|while|foreach|as|return|die|exit|if|then|else|

char|signed|unsigned|short|long

)(?!\w|=")/ix'

=> '$1',

// PHP/Perl-Style Vars: $var, %var, @var

'/(?<!\w)(

(\$|\%|\@)(\->|\w)+

)(?!\w)/ix'

=> '$1'

);

$s = preg_replace_callback( '/(

\/\*.*?\*\/|

\/\/.*?\n|

\#.[^a-fA-F0-9]+?\n|

\<\!\-\-[\s\S]+\-\-\>|

(?<!\\\)".*?(?<!\\\)"|

(?<!\\\)\'(.*?)(?<!\\\)\'

)/isx' , array('SyntaxHighlight', 'replaceId'),$s);

$s = preg_replace(array_keys($regexp), array_values($regexp), $s);

// Paste the comments and strings back in again

$s = str_replace(array_keys(SyntaxHighlight::$tokens), array_values(SyntaxHighlight::$tokens), $s);

// Delete the "Escaped Backslash Workaround Token" (TM)

// and replace tabs with four spaces.

$s = str_replace(array('<e>', "\t"), array('', ' '), $s);

return '<pre>'.$s.'</pre>' ;

}

// Regexp-Callback to replace every comment or string with a uniqid and save

// the matched text in an array

// This way, strings and comments will be stripped out and wont be processed

// by the other expressions searching for keywords etc.

static function replaceId($match) {

$id = "##r" . uniqid() . "##";

// String or Comment?

if(substr($match[1], 0, 2) == '//' || substr($match[1], 0, 2) == '/*' || substr($match[1], 0, 2) == '##' || substr($match[1], 0, 7) == '<!--') {

SyntaxHighlight::$tokens[$id] = '' . $match[1] . '';

} else {

SyntaxHighlight::$tokens[$id] = '' . $match[1] . '';

}

return $id;

}

THE CSS

pre { 
	font-family: 'Courier New', 'Bitstream Vera Sans Mono', 'monospace'; 
	font-size: 9pt;
	border-top: 1px solid #333;
	border-bottom: 1px solid #333;
	padding: 0.4em;
	color: #fff;
}
pre span.N{ color:#f2c47f; } /* Numbers */
pre span.S{ color:#42ff00; } /* Strings */
pre span.C{ color:#838383; } /* Comments */
pre span.K{ color:#ff0078; } /* Keywords */
pre span.V{ color:#70d6ff; } /* Vars */
pre span.D{ color:#ff9a5d; } /* Defines */

pre {

font-family: 'Courier New', 'Bitstream Vera Sans Mono', 'monospace';

font-size: 9pt;

border-top: 1px solid #333;

border-bottom: 1px solid #333;

padding: 0.4em;

color: #fff;

}

pre span.N{ color:#f2c47f; } /* Numbers */

pre span.S{ color:#42ff00; } /* Strings */

pre span.C{ color:#838383; } /* Comments */

pre span.K{ color:#ff0078; } /* Keywords */

pre span.V{ color:#70d6ff; } /* Vars */

pre span.D{ color:#ff9a5d; } /* Defines */

USAGE

echo SyntaxHighlight::process( $your_code );

1	echo SyntaxHighlight::process( $your_code );

@GitHub portalzine/UtilityBelt/SyntaxHighlight

Enjoy coding …

29. Februar 2016

AMP-WP Tweaks & Tips

The AMP (Accelerated Mobile Pages Project) plugin for WordPress is still pretty young and under heavy development.

There are little things that can help to fix current validation problems. I have a couple of fresh AMP pages, that are already indexed by Google.

0. RESOURCES

1. MISSING IMAGE (schema.org-NewsArticle)

The currently registered Microformats template (schema.org-NewsArticle) requires an image.
The AMP-WP documentation explains how to add a featured image to your pages (documentation).

I extended that a bit, to link a default attachment image, I uploaded before. This needs to be added to your themes functions.php.

function xyz_amp_add_custom_actions() {
    add_filter( 'the_content', 'xyz_amp_add_featured_image' );
}

function xyz_amp_add_featured_image( $content ) {

 $your_attachment_id = 2016;

 if ( has_post_thumbnail() ) {
  $image = sprintf( '<p class="xyz-featured-image">%s</p>', get_the_post_thumbnail() );
        
 }else{
 $image = sprintf( '<p class="xyz-featured-image">%s</p>', wp_get_attachment_image( $your_attachment_id, 1280) );
        $content = $image . $content ;
 }
 $content = $image . $content ;
 return preg_replace('/(<br>\s*){2,}/', '<br/>',$content);
}

function xyz_amp_add_custom_actions() {

add_filter( 'the_content', 'xyz_amp_add_featured_image' );

}

function xyz_amp_add_featured_image( $content ) {

$your_attachment_id = 2016;

if ( has_post_thumbnail() ) {

$image = sprintf( '%s', get_the_post_thumbnail() );

}else{

$image = sprintf( '%s', wp_get_attachment_image( $your_attachment_id, 1280) );

$content = $image . $content ;

}

$content = $image . $content ;

return preg_replace('/( \s*){2,}/', ' ',$content);

}

Next we adjust the Microformats definition. This needs to be added to your themes functions.php.

add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 );

function xyz_amp_modify_json_metadata( $metadata, $post ) {
  if(empty($metadata['image'])){
    $your_attachment_id = 2016;
    $imgMeta = wp_get_attachment_metadata($your_attachment_id );
    $metadata['image'] = array(
        '@type' => 'ImageObject',
        'url' => wp_get_attachment_url( $your_attachment_id ),
        'height' => $imgMeta['height'],
        'width' =>  $imgMeta['width'],
    );
  }
    return $metadata;
}

add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 );

function xyz_amp_modify_json_metadata( $metadata, $post ) {

if(empty($metadata['image'])){

$your_attachment_id = 2016;

$imgMeta = wp_get_attachment_metadata($your_attachment_id );

$metadata['image'] = array(

'@type' => 'ImageObject',

'url' => wp_get_attachment_url( $your_attachment_id ),

'height' => $imgMeta['height'],

'width' => $imgMeta['width'],

);

}

return $metadata;

}

2. ADD YOUR OWN AMP TEMPLATE

Read the AMP-WP documentation first :) This forces AMP-WP to override the core template with your own. Use the default template as a reference.

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {
    if ( 'single' === $type ) {
        $file = dirname( __FILE__ ) . '/amp/amp_template.php';
    }
    return $file;
}

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {

if ( 'single' === $type ) {

$file = dirname( __FILE__ ) . '/amp/amp_template.php';

}

return $file;

}

3. REMOVE NONE VALIDATING CONTENT

Normally the core sanitizer should take care of that. I am sure a filter will be added in the future. For now, this is a quick workaround. You can use a RegExp or DOMDocument to alter the amp-content in your custom template and filter things that break validation.

$attributes = $element->attributes;
while ($attributes->length) {
    $element->removeAttribute($attributes->item(0)->name);
}

$attributes = $element->attributes;

while ($attributes->length) {

$element->removeAttribute($attributes->item(0)->name);

}

I am using phpQuery for now, as it allows me to add quick fixes. DOMNode or QueryPath works nicely as well :) Will be looking at the core sanitizer and options later this week. All of this is currently added to the custom template.

 require('your-libs/phpQuery/phpQuery.php');
 $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

1 2	require('your-libs/phpQuery/phpQuery.php'); $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

Remove REL attributes that are not allowed. Only registered Microformat rel attributes are allowed.

$doc['.prettyphoto']->removeAttr("rel");

1

$doc['.prettyphoto']->removeAttr("rel");
Remove attribute ALIGN

$doc['*']->removeAttr("align");

1

$doc['*']->removeAttr("align");
Fix TARGET Attribute

$doc['a[target="new"]']->attr("target","_blank");

1

$doc['a[target="new"]']->attr("target","_blank");

Finally output the fixed content as HTML.

 echo  $doc->html(); // amphtml content; no kses

1	echo $doc->html(); // amphtml content; no kses

The above examples need to be tweaked to your specific content requirements.

The custom template „post_amp_content“ before:

 echo $this->get( 'post_amp_content'); // amphtml content; no kses

1	echo $this->get( 'post_amp_content'); // amphtml content; no kses

The custom template „post_amp_content“ after:

 require('your-libs/phpQuery/phpQuery.php');
 $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' )); 
 $doc['.prettyphoto']->removeAttr("rel")->removeAttr("href");
 $doc['*']->removeAttr("align");
 $doc['a[target="new"]']->attr("target","_blank");
 echo  $doc->html(); // amphtml content; no kses

require('your-libs/phpQuery/phpQuery.php');

$doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

$doc['.prettyphoto']->removeAttr("rel")->removeAttr("href");

$doc['*']->removeAttr("align");

$doc['a[target="new"]']->attr("target","_blank");

echo $doc->html(); // amphtml content; no kses

4. ADD PREVIOUS & NEXT POST NAVIGATION

From the AMP specification :“Note, that AMP document may also be linked to directly…“

This is being added to the custom template as well.

Next:

global $query_string; 
$posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post(); 

$next_post = get_next_post();
if (!empty( $next_post )): 
 echo '<a class="next" href="'.amp_get_permalink( $next_post->ID ).'"> &#8604; '.$next_post->post_title.'</a>';
endif;

global $query_string;

$posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post();

$next_post = get_next_post();

if (!empty( $next_post )):

echo '<a class="next" href="'.amp_get_permalink( $next_post->ID ).'"> ↜ '.$next_post->post_title.'</a>';

endif;

Previous:

$prev_post = get_previous_post();

if (!empty( $prev_post )): 
 echo '<a class="prev" href="'.amp_get_permalink( $prev_post->ID ).'"> &#8604; '.$prev_post->post_title.'</a>';
endif;

$prev_post = get_previous_post();

if (!empty( $prev_post )):

echo '<a class="prev" href="'.amp_get_permalink( $prev_post->ID ).'"> ↜ '.$prev_post->post_title.'</a>';

endif;

5. SYNTAX HIGHLIGHTING

You can find a simple pure PHP highlighter here. Not perfect, but a start. Don not forget to include the CSS :)

require_once("your-lib/SyntaxHighlight/SyntaxHighlight.php");
foreach(pq('pre') as $code)
{
 pq($code)->html(SyntaxHighlight::process(pq($code)->text()));
}

require_once("your-lib/SyntaxHighlight/SyntaxHighlight.php");

foreach(pq('pre') as $code)

{

pq($code)->html(SyntaxHighlight::process(pq($code)->text()));

}

I will extend on this as new validation errors or tweaks come up. The core sanitizer of AMP-WP still needs some work and should allow us to do some of the above directly, when the content is parsed / converted for AMP.

6. OTHER AMP ARTICLES

Make Syntax Highlighting work in AMP-WP using GeSHi

Time to get AMP ready

Enjoy coding …

26. Februar 2016

Structure – IoT platform that connects devices and data

Structure opened its doors a couple of days ago.

Structure offers a simple and powerful IoT cloud platform for developing the next generation of connected experiences. They offer device management with robust data visualization that reacts in real-time.

They have a nice drag & drop workflow interface that allows you to forward data coming in, combine data or just store it.

I will be testing a builder kit with the platform, that includes the Adafruit Feather Huzzah, which offers native Wifi connectivity. My Raspberry Pi’s will also find their way into the system. The platform allows to consume REST Apis as well, that will make it even more fun to build something unique.

If you are interested in IoT, you should really check it out. Its free :)

Structure / Adafruit Feather Huzzah