ComunicAPI/functions/files.php
2018-05-01 09:33:52 +02:00

156 lines
4.0 KiB
PHP

<?php
/**
* Files functions
*
* @author Pierre HUBERT
*/
/**
* Prepare a file creation
*
* @param int $userID The ID of the user owning the file
* @param string $componentName The name of the target component
* @return string the file path (based on user_data folder)
*/
function prepareFileCreation(int $userID, string $componentName) : string {
//Get user data folder name
$user_data_folder = path_user_data("", true);
//Determine subfolder name (if any)
if($userID != 0)
$subfolder = $componentName."/".$userID."/";
else
$subfolder = $componentName."/";
//Check if folders exists or not
if(!file_exists($user_data_folder.$subfolder)){
//Create folders recursively
mkdir($user_data_folder.$subfolder, 0777, true);
//Create security file (empty index.html file)
file_put_contents($user_data_folder.$subfolder."index.html", "");
}
//Return folder
return $subfolder;
}
/**
* Generate a file name for a new file
*
* @param string $directory The target directory
* @param string $extension The file extension
* @return string The generated file name
*/
function generateNewFileName(string $directory, string $extension) : string {
//First, check if folder exists
if(!file_exists($directory))
return false;
//Generate a random filename
do {
//Generate a new filename
$fileName = random_str(25).".".$extension;
}
while(file_exists($directory.$fileName));
//Return the generated filename
return $fileName;
}
/**
* Reduces an image size
*
* @param string $fileName The name of the image to reduce / "string" to give an image string
* @param string $targetFile The target of the reduced image
* @param int $maxWidth The maximal width of the image
* @param int $maxHeight The maximal height of the image
* @param string $outFormat The output format
* @param string $img_string Optionnal, the image string if it is a string
* @return bool True for a success / False for a failure
*/
function reduce_image(string $fileName, string $targetFile, int $maxWidth, int $maxHeight, string $outFormat = "image/png", string $img_string="") : bool{
//Check if we have to reduce physical image or an image contained in a variable
if($fileName != "string"){
//Check if image exists or not
if(!file_exists($fileName))
return false;
//Try to get image size
if(!$imageInfos = getimagesize($fileName))
return false; //File doesn't seems to be an image
}
else {
//Get informations about the image in the string
if(!$imageInfos = getimagesizefromstring($img_string))
return false; //Couldn't create image
}
//Extract image width and height
$width = $imageInfos[0];
$height = $imageInfos[1];
//Check image size
if($width == 0 || $height == 0)
return false; //Can't process such image
//Try to open image
if($fileName === "string")
$src = imagecreatefromstring($img_string);
elseif($imageInfos['mime'] === "image/png")
$src = imagecreatefrompng($fileName);
elseif($imageInfos['mime'] === "image/jpeg")
$src = imagecreatefromjpeg($fileName);
elseif($imageInfos['mime'] === "image/gif")
$src = imagecreatefromgif($fileName);
//elseif($imageInfos['mime'] === "image/x-ms-bmp")
// $src = imagecreatefrombmp($fileName);
else
return false; //Unrecognized image type
//Check if image size can be kept as is
if($width <= $maxWidth AND $height <= $maxHeight){
//We keep the same dimensions
$newWidth = $width;
$newHeight = $height;
}
elseif($width > $maxWidth){
$newWidth = $maxWidth;
$newHeight = floor(($height*$maxWidth)/$width);
}
else {
$newHeight = $maxHeight;
$newWidth = floor(($width*$maxHeight)/$height);
}
//Create reduced image
$dest = imagecreatetruecolor($newWidth, $newHeight);
//Copy image
imagecopyresized($dest, $src, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
//Try to export image
//PNG
if($outFormat === "image/png"){
if(!imagepng($dest, $targetFile, 2))
return false;
}
//JPEG
elseif($outFormat === "image/jpeg"){
if(!imagejpeg($dest, $targetFile, 2))
return false;
}
//UNSUPPORTED
else
return false; //Unkown export format
//Success
return true;
}