obsidian-web/backend/functions.php

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<?php
/**
* Debug output to the browser console
*/
function console_log( $data ) {
echo "<script>";
echo "console.log(". json_encode( $data ) . ")";
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echo "</script>";
}
/**
* List the subdirectories of a folder.
* Ignore ones marked hidden.
*/
function listFolders( $root, $hidden=false) {
$list = array();
if( !is_dir( $root ) ) {
throw new Exception("'".$root."' is not a folder!");
}
$root_content = scandir( $root );
/**
* Catch no permission, or empty folder
*/
if( empty( $root_content) ) {
return $list;
}
foreach ( $root_content as $subdir ) {
if ( ($subdir[0] != "." || $hidden ) && is_dir( $path = $root."/".$subdir) ) {
$list[] = $path;
}
}
return $list;
}
/**
* List all files in the folder.
* Ignores hidden files.
*/
function listFiles( $root, $cascade=false, $first=false ) {
$list = array();
if( !is_dir( $root ) ) {
throw new Exception("'".$root."' is not a folder.");
}
$files = scandir( $root );
/**
* Catch no permission, or empty folder
*/
if ( empty( $files ) ) {
return $list;
}
foreach ( $files as $file ) {
if( $file[0] != "." ) {
if ( is_file( $path = $root."/".$file ) ) {
if ( $first ) {
return $path;
}
$list[] = $path;
} else {
if($cascade) {
$list = array_merge( $list, listFiles( $root . "/" . $file, true));
}
}
}
}
if($first) {
return $list[0];
}
return $list;
}
/**
* Discount strip_slashes - from a file name
*/
function tidyName( $name ) {
if ( strpos( $name, "/" ) > -1 ) {
return substr( $name, strrpos( $name, "/" ) + 1);
} else {
return $name;
}
}
/**
* Check directory structure for integrity
*/
function isPathValid( $file, $path ) {
$realFile = realpath( $file );
$realDir = realpath( $path );
/**
* If the two paths match, then the path is valid
*/
if ( $realFile == $realDir ) {
return true;
}
/**
* If the file path starts with the dir path,
* then the file path is valid
*/
if ( substr( $realFile, 0, strlen( $realDir ) ) == $realDir ) {
return true;
}
/**
* Otherwise, the file is not in the path, and it is invalid.
*/
return false;
}
/**
* Set up headers and send a http reply with the given file.
*/
function sendFile( $image ) {
// Expires in 2 weeks
$expires = 60*60*24*14;
$lastModified = filemtime( $image );
//$etag = md5_file( $image );
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ob_clean();
header("Last-Modified: $lastModified GMT");
header("Pragma: public");
header("Cache-Control: max-age=$expires");
//header("Etag: $etag");
header("Expires: " . gmdate('D, d M Y H:i:s', time() + $expires) . " GMT");
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header("Content-type: image/png");
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if(!readfile( $image )) {
console_log("Problem with file $image!");
}
}
/**
* Check that a file is in a given folder.
*/
function isInFolder( $file, $folder ) {
return substr( $folder, 0, strlen( $file ) ) == $file;
}
/**
* Convert an absolute path (for filesystem) to a relative path (for web server)
*/
function absoluteToRelative( $file, $folder ) {
$realFile = realpath( $file );
$realDir = realpath( $folder );
if ($realFile == $realDir ) return "";
if ( !isInFolder( $realDir, $realFile ) ) {
throw new Exception("File is not in the photos folder.");
}
return substr( $realFile, strlen( $realDir ) + 1);
}
/**
* Convert a relative path (from the file server) to an absolute path (for the filesystem)
*/
function relativeToAbsolute( $file, $folder ) {
return $folder . "/" . $file;
}
/**
* Get all of the steps needed to get to where we are, from the home page
*/
function breadcrumbs( $path ) {
$list = array();
$slash = strpos( $path, "/");
while($slash > 0) {
$list[] = substr( $path, 0, $slash );
$path = substr( $path, $slash + 1 );
$slash = strpos( $path, "/" );
}
if( $path != "" ) {
$list[] = $path;
}
return $list;
}
/**
* Create a smaller copy of the image to serve as a thumbnail.
*/
function createThumbnail( $source, $thumbnailPath, $thumbnailFolder ) {
require_once("resources/libs/php/ThumbLib.inc.php");
if ( !file_exists( $thumbnailPath ) || filectime( $source ) > filectime( $thumbnailPath ) ) {
if ( !file_exists( dirname( $thumbnailPath ) ) ) {
@mkdir( dirname( $thumbnailPath ) );
}
$thumbnail = PhpThumbFactory::create( $source );
$thumbnail->resize( 200, 200 );
$thumbnail->save( $thumbnailPath );
$newFile = fopen( $thumbnailFolder . "/newImages.txt", "a+" );
fwrite( $newFile, realpath( $source ) . "\n");
$file = file( $thumbnailFolder . "/newImages.txt" );
$file = array_slice( $file, 0, 20 );
file_put_contents( $thumbnailFolder . "/newImages.txt", implode( "", $file ) );
}
}