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<?php
/**
* Shared Functions
*
* Small utilities shared by a number of other functions
*
* @package	Artiss-YouTube-Embed
*/

/**
* Is Do Not Track active?
*
* Function to return whether Do Not Track is active in the current
* browser
*
* @since	2.6
*
* @return			    string	True or false
*/

function aye_do_not_track() {    // 1.0

if ( isset( $_SERVER[ 'HTTP_DNT' ] ) ) {
		if ( $_SERVER[ 'HTTP_DNT' ] == 1 ) { return true; }
	} else {
		if ( function_exists( 'getallheaders' ) ) {
			foreach ( getallheaders() as $key => $value ) {
				if ( ( strtolower( $key ) === 'dnt' ) && ( $value == 1 ) ) { return true; }
			}
		}
	}
	return false;
}

/**
* Get the cookie path
*
* Work out the path for the current installation to add cookies for
*
* @since	2.6
*
* @return	string				Cookie path
*/

function aye_get_cookie_path() {

// Remove the http:// from the beginning of the site URL

$path = str_replace( 'http://', '', site_url( '/', 'http' ) );

// Find the first slash in the results

$pos = strpos( $path, '/' );

// Strip all before the first slash

$path = substr( $path, $pos ) . 'wp-content/';

return $path;
}

/**
* Extract parameters (1.0)
*
* Function to extract parameters from an input string
*
* @since	2.0
*
* @param	string	$input		Input string to search through
* @param	string	$para		Parameter to look for
* @return	string				Parameter value (if found)
*/

function aye_get_parameters( $input, $para ) {

$start = strpos( strtolower( $input ), $para . '=' );
	$content = '';

if ( $start !== false ) {
		$start = $start + strlen( $para ) + 1;
		$end=strpos( strtolower( $input ), '&', $start );
		if ( $end !== false ) { $end = $end - 1; } else { $end = strlen( $input ); }
		$content = substr( $input, $start, $end - $start + 1 );
	}

return $content;
}

/**
* Extract a video ID
*
* Function to extract an ID if a full URL has been supplied
*
* @since	2.0
*
* @param	string	$id		Video ID
* @return	string			Extracted ID
*/

function aye_extract_id( $id ) {

// Convert and trim video ID characters

$id = trim( str_replace( '–', '--', str_replace( '×', 'x', strip_tags( $id ) ) ) );

// Check if it's the full URL, as found in address bar

$video_pos = strpos( $id, 'youtube.com/watch?', 0 );

if ( $video_pos !== false ) {

$video_pos = strpos( $id, 'v=', $video_pos + 18 );
		if ( $video_pos === false ) { $video_pos = strpos( $id, 'p=', $video_pos + 18 ); }

if ( $video_pos !== false ) {

$video_pos = $video_pos + 2;
			$ampersand_pos = strpos( $id, '&', $video_pos );
			if ( !$ampersand_pos ) {
				$id = substr( $id, $video_pos );
			} else {
				$id = substr( $id, $video_pos, $ampersand_pos - $video_pos );
			}
		}

} else {

// Now check to see if it's a full URL, as used in the embed code
		// Need to check both video and playlist formats

$video_pos = strpos( $id, 'youtube.com/v/' );
		if ($video_pos === false) { $video_pos = strpos( $id, 'youtube.com/p/' ); }

if ( $video_pos !== false ) {
			$video_pos = $video_pos + 14;
			$qmark_pos = strpos( $id, '?', $video_pos );
			if ( !$qmark_pos ) {
				$id = substr( $id, $video_pos );
			} else {
				$id = substr( $id, $video_pos, $qmark_pos - $video_pos );
			}

} else {

// Check if it's a shortened URL

$video_pos = strpos( $id, 'youtu.be/', 0 );

if ( $video_pos !== false ) {
				$video_pos = $video_pos + 9;
				$ampersand_pos = strpos( $id, '&', $video_pos );
				if ( !$ampersand_pos ) {
					$id = substr( $id, $video_pos );
				} else {
					$id = substr( $id, $video_pos, $ampersand_pos - $video_pos );
				}
			}
		}
	}

return $id;
}

/**
* Validate video type
*
* Function to work out what type of video has been requested and
* whether it is valid. Also fetches the video title.
*
* @since	2.0
*
* @uses     aye_set_general_defaults Get the default settings
*
* @param	string	$id				Video ID
* @param	string	$title_needed	Whether the title requires extracting
* @return	string					Array containing file details
*/

function aye_validate_id( $id, $title_needed = false ) {

$type = false;
	$title = false;
	$options = false;

$options = aye_set_general_defaults();

// Attempt to get the video type and title from cache

if ( $options[ 'info_cache' ] != 0 ) {
		$type = get_transient( 'aye_type_' . $id );
		$title = get_transient( 'aye_title_' . $id );
	}

// Check if items are cached

$cache = true;
	if ( ( !$type ) or ( !$title ) ) { $cache = false; }

// Get video information if not cached

if ( !$cache ) {

$type = '-';

if ( $options [ 'api' ] != 0 ) {

if ( ( $options[ 'api' ] == 2 ) or ( $options[ 'api' ] == 4 ) ) { $https = 's'; } else { $https = ''; }

// Check with YouTube API as to whether the ID is a video

$id_check = aye_get_file( 'http' . $https . '://gdata.youtube.com/feeds/api/videos/' . $id . '?v=2', false );
			if ( $id_check[ 'rc' ] == 0 ) {
				if ( $id_check[ 'response' ] != 200 ) {

// Check with YouTube API as to whether the ID is a playlist

if ( strtolower( substr( $id, 0, 2 ) ) == 'pl' ) { $id = substr( $id, 2 ); }
					$id_check = aye_get_file( 'http' . $https . '://gdata.youtube.com/feeds/api/playlists/' . $id . '?v=2', false );
					if ( $id_check[ 'rc' ] == 0 ) {
						if ( $id_check[ 'response' ] != 200 ) {
							$type = '';
						} else {
							$type = 'p';
						}
					}
				} else {
					$type = 'v';
				}
			}
		}

// If no type has been assigned then an API error must have occured

if ( $type == '-' ) {

if ( ( $options[ 'api' ] == 1 ) or ( $options[ 'api' ] == 2 ) ) {

// If reporting API errors, output it

$type = sprintf( __('An error occurred accessing the YouTube API for video ID %s - %s', 'youtube-embed' ), $id, $id_check[ 'error' ] );

} else {

// If not reporting errors or API switched off, work out whether a video or playlist

$type = '';
				if ( strlen( $id ) == 11 ) {
					$type = 'v';
				} else {
					if ( strlen( $id ) == 16 ) {
						$type = 'p';
					}
				}
			}
		}

// Update the cache

set_transient( 'aye_type_' . $id, $type, $options[ 'info_cache' ] * 3600 );

// If the video is valid extract the title from the XML

if ( ( $title_needed) && ( $id_check[ 'file' ] != '' ) ) {

// Find title in XML

$tag_start = strpos( $id_check[ 'file' ], '<title>', 1 ) + 7;
			if ( $tag_start !== false ) {
				$tag_end = strpos( $id_check[ 'file' ], '</title>', $tag_start );
				if ( $tag_end !== false ) {
					$title = substr( $id_check[ 'file' ], $tag_start, $tag_end - $tag_start );
				}
			}

// Update the cache

set_transient( 'aye_title_' . $id, $title, $options[ 'info_cache' ] * 3600 );
		}
	}

if ( !$title_needed ) { return $type; }

$return[ 'type' ] = $type;
	$return[ 'title' ] = $title;
	return $return;
}

/**
* Function to report an error
*
* Display an error message in a standard format
*
* @since	2.0
*
* @param	string	$errorin	Error message
* @return	string				Error output
*/

function aye_error( $errorin ) {

return '<p style="color: #f00; font-weight: bold;">Artiss YouTube Embed: ' . $errorin . "</p>\n";

}

/**
* Convert input to a 1 or 0 equivalent
*
* Function to convert a Yes or No input to an equivalent 1 or 0 output
*
* @since	2.0
*
* @uses		aye_yes_or_no		Convert input to a true or false equivalent
*
* @param	string	$input		Input, usually Yes or No
* @return	string				1, 0 or blank, depending on input
*/

function aye_convert( $input ) {

$input = aye_yes_or_no( $input );
	$output = '';
	if ( $input === true ) { $output = '1'; }
	if ( $input === false ) { $output = '0'; }

return $output;
}

/**
* Convert input to a 1 or 3 equivalent
*
* Function to convert a Yes or No input to an equivalent 1 or 3 output
*
* @since	2.0
*
* @uses		aye_yes_or_no		Convert input to a true or false equivalent
*
* @param	string	$input		Input, usually Yes or No
* @return   string				1, 3 or blank, depending on input
*/

function aye_convert_3( $input ) {

$input = aye_yes_or_no( $input );
	$output = '';
	if ( $input === true ) { $output = '1'; }
	if ( $input === false ) { $output = '3'; }

return $output;
}

/**
* Convert input to True or False (1.0)
*
* Return true or false, depending on the input. Possible inputs are Yes, No, 0, 1, True,
* False, On, Off
*
* @since	2.0
*
* @param	string	$input		Value passed for checking
* @return	string				Blank string or boolean true, false
*/

function aye_yes_or_no( $input = '' ) {

$input = strtolower( $input );
	if ( ( $input === true ) or ( $input == 'true' ) or ( $input == '1' ) or ( $input == 'yes' ) or ( $input == 'on' ) ) { return true; }
	if ( ( $input === false ) or ( $input == 'false' ) or ( $input == '0' ) or ( $input == 'no' ) or ( $input == 'off' ) ) { return false; }

return;
}

/**
* Fetch a file (1.6)
*
* Use WordPress API to fetch a file and check results
* RC is 0 to indicate success, -1 a failure
*
* @since	2.0
*
* @param	string	$filein		File name to fetch
* @param	string	$header		Only get headers?
* @return	string				Array containing file contents and response
*/

function aye_get_file( $filein, $header = false ) {

$rc = 0;
	$error = '';
	if ( $header ) {
		$fileout = wp_remote_head( $filein );
		if ( is_wp_error( $fileout ) ) {
			$error = 'Header: '.$fileout->get_error_message();
			$rc = -1;
		}
	} else {
		$fileout = wp_remote_get( $filein );
		if ( is_wp_error( $fileout ) ) {
			$error = 'Body: '.$fileout->get_error_message();
			$rc = -1;
		} else {
			if ( isset( $fileout[ 'body' ] ) ) {
				$file_return[ 'file' ] = $fileout[ 'body' ];
			}
		}
	}

$file_return[ 'error' ] = $error;
	$file_return[ 'rc' ] = $rc;
	if ( !is_wp_error( $fileout ) ) {
		if ( isset( $fileout[ 'response' ][ 'code' ] ) ) {
			$file_return[ 'response' ] = $fileout[ 'response' ][ 'code' ];
		}
	}

return $file_return;
}

/**
* Function to set embed type
*
* Depending on embed parameters set a value
*
* @since	2.0
*
* @uses		aye_convert			Convert value to a 0 or 1 equivalent
*
* @param	string	$type		Current embed type
* @param	string	$embedplus	Whether EmbedPlus embedding is required
* @return	string				The type of embedding to use
*/

function aye_get_embed_type( $type, $embedplus ) {

$embedplus = aye_convert( $embedplus );
	$type = strtolower( $type );

if ( ( $type == 'embedplus' ) or ( $embedplus == '1' ) ) { $type = 'm'; }
	if ( $type == 'iframe' ) { $type = 'v'; }
	if ( $type == 'object' ) { $type = 'p'; }
	if ( $type == 'chromeless' ) { $type = 'c'; }

return $type;
}

/**
* Convert autohide parameter
*
* Convert autohide text value to a numeric equivalent
*
* @since	2.0
*
* @param	string	$autohide	Autohide parameter value
* @return	string				Autohide numeric equivalent
*/

function aye_set_autohide( $autohide ) {

$autohide = strtolower( $autohide );
	if ( $autohide == 'no' )	{ $autohide = '0'; }
	if ( $autohide == 'yes' )	{ $autohide = '1'; }
	if ( $autohide == 'fade' )	{ $autohide = '2'; }

return $autohide;
}

/**
* Generate a profile list
*
* Generate FORM options for the current profiles
*
* @since	2.0
*
* @param	string	$current	The current profile number
* @param	string	$total		The total number of profiles
*/

function aye_generate_profile_list( $current, $total ) {

echo '<option value="0"';
	if ( $current == "0" ) { echo " selected='selected'"; }
	echo ' >' . __( 'Default' ) . '</option>';
	$loop = 1;
	while ( $loop <= $total ) {

$profiles = get_option( 'youtube_embed_profile' . $loop );
		$profname = $profiles[ 'name' ];

if ( $profname == '' ) { $profname = __( 'Profile' ) . ' ' . $loop; }
		if ( strlen( $profname ) > 30 ) { $profname = substr( $profname, 0, 30 ) . '…'; }
		echo '<option value="' . $loop . '"';

if ( $current == $loop ) { echo " selected='selected'"; }
		echo '>' . __( $profname ) . "</option>\n";

$loop ++;
	}

return;
}
?>