resourcespace/plugins/image_text/hooks/collection_download.php

<?php

use Montala\ResourceSpace\CommandPlaceholderArg;
function HookImage_textCollection_downloadReplaceuseoriginal()
    {
    global $usergroup, $image_text_override_groups, $lang;
    # Return if not configured for this resource type or user does not have the option to download without overlay
    if (!in_array($usergroup, $image_text_override_groups)){return false;}
        
     ?><div class="Question">
    <label for="no_overlay"><?php echo escape($lang['image_text_download_clear']); ?></label><input type=checkbox id="nooverlay" name="nooverlay" value="true" >
    <div class="clearerleft"> </div></div>
    <?php
    return false;        
    }

function HookImage_textCollection_downloadModifydownloadfile($resource)
{
    global $p, $newpath, $userref, $usergroup, $pextension,
    $image_text_restypes, $image_text_override_groups, $image_text_filetypes,
    $usesize, $use_watermark, $alternative, $tmpfile, $filename, 
    $image_text_height_proportion, $image_text_max_height, $image_text_min_height, 
    $image_text_font, $image_text_position,$image_text_banner_position, $imagemagick_path;

    # Return if not configured for this resource type or if user has requested no overlay and is permitted this
    if (
        !in_array($resource['resource_type'], $image_text_restypes)
        || !in_array(strtoupper($resource['file_extension']), $image_text_filetypes)
        || (getval("nooverlay","") != "" && in_array($usergroup, $image_text_override_groups))
        || $use_watermark
    ) {
        return false;
    }

     # Get text from field
    global $image_text_field_select, $image_text_default_text;
    $overlaytext=get_data_by_field($resource["ref"], $image_text_field_select);
    if ($overlaytext=="") {
        if ($image_text_default_text != "") {
            $overlaytext=$image_text_default_text;
        } else {
            return false;
        }
    }

    # If this is not a temporary file having metadata written see if we already have a suitable size with the correct text
    $image_text_saved_file=get_resource_path($resource["ref"],true,$usesize . "_image_text_" . md5($overlaytext . $image_text_height_proportion . $image_text_max_height . $image_text_min_height . $image_text_font . $image_text_position . $image_text_banner_position) . "_" ,false,$pextension,-1,1);

    if ($p!=$tmpfile && $p!=$newpath && file_exists($image_text_saved_file)) {
        $p=$image_text_saved_file;
        return true;
    }

    # Locate imagemagick.
    $identify_fullpath = get_utility_path("im-identify");
    if (!$identify_fullpath) {
        debug("Could not find ImageMagick 'identify' utility at location '{$imagemagick_path}'.");
        return false;
    }

    # Get image's dimensions.
    $identcommand = $identify_fullpath . ' -format %wx%h [FILE]';
    $cmdparams =  ["[FILE]" => new CommandPlaceholderArg($p, 'is_valid_rs_path')];
    $identoutput =run_command($identcommand, false, $cmdparams);

    preg_match('/^([0-9]+)x([0-9]+)$/ims',$identoutput,$smatches);
    if ((@list(,$width,$height) = $smatches)===false) { return false; }

    $olheight=floor($height * $image_text_height_proportion);
    if($olheight<$image_text_min_height && intval($image_text_min_height)!=0){$olheight=$image_text_min_height;}
    if($olheight>$image_text_max_height && intval($image_text_max_height)!=0){$olheight=$image_text_max_height;}

    # Locate imagemagick.
    $convert_fullpath = get_utility_path("im-convert");
    if (!$convert_fullpath) {
        exit("Could not find ImageMagick 'convert' utility at location '$imagemagick_path'");
    }

    $tmpolfile= get_temp_dir() . "/" . $resource["ref"] . "_image_text_" . $userref . "." . $pextension;

    $createolcommand = $convert_fullpath . ' -background [BACKCOLOUR] -fill white -gravity [POSITION] -font [FONT] -size [WIDTHxHEIGHT] caption:[CAPTION] [TMPOLFILE]';
    $cmdparams =  [
        "[BACKCOLOUR]" => "#000",
        "[FILE]" => new CommandPlaceholderArg($p, 'is_valid_rs_path'),
        "[POSITION]" => new CommandPlaceholderArg($image_text_position,fn($val): bool => in_array($val, ["east","west","center"])),
        "[FONT]" => $image_text_font,
        "[WIDTHxHEIGHT]" => (int) $width . "x" . (int) $olheight,
        "[CAPTION]" => new CommandPlaceholderArg($overlaytext, 'is_string'),
        "[TMPOLFILE]" => new CommandPlaceholderArg($tmpolfile, 'is_valid_rs_path'),
    ];
    run_command($createolcommand, false, $cmdparams);

    $newdlfile = get_temp_dir() . "/" . $resource["ref"] . "_image_text_result_" . $userref . "." . $pextension;

    if ($image_text_banner_position == "bottom") {
        $convertcommand = $convert_fullpath . " [FILE] [TMPOLFILE] -append [NEWDLFILE]";
    } else {
        $convertcommand = $convert_fullpath . " [TMPOLFILE] [FILE] -append [NEWDLFILE]";
    }
     $cmdparams = [
        "[FILE]" => new CommandPlaceholderArg($p, 'is_valid_rs_path'),
        "[TMPOLFILE]" => new CommandPlaceholderArg($tmpolfile, 'is_valid_rs_path'),
        "[NEWDLFILE]" => new CommandPlaceholderArg($newdlfile, 'is_valid_rs_path'),
    ];
    run_command($convertcommand, false, $cmdparams);

    if ($p!=$tmpfile) {
        # If this is not a temporary file having metadata written then copy it to the filestore for future use
        copy($newdlfile, $image_text_saved_file);
    }

    if ($p == $tmpfile || $p == $newpath) {
        # Replace file in temporary directory with modified file
        unlink($p);
        rename($newdlfile,$p);
    } else {
        # File is in original location, just retarget $p
        $p=$newdlfile;
    }

    if (file_exists($tmpolfile)) {
        unlink($tmpolfile);
    }

    return true;
}