mirror of
https://github.com/sbrl/Pepperminty-Wiki.git
synced 2024-12-23 01:55:01 +00:00
315 lines
12 KiB
PHP
315 lines
12 KiB
PHP
<?php
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register_module([
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"name" => "Uploader",
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"version" => "0.1",
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"author" => "Starbeamrainbowlabs",
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"description" => "Adds the ability to upload files to Pepperminty Wiki. Uploaded files act as pages and have the special 'File:' prefix.",
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"id" => "feature-upload",
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"code" => function() {
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add_action("upload", function() {
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global $settings, $env, $pageindex;
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switch($_SERVER["REQUEST_METHOD"])
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{
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case "GET":
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// Send upload page
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if(!$settings->upload_enabled)
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exit(page_renderer::render("Upload Disabled - $setting->sitename", "<p>You can't upload anything at the moment because $settings->sitename has uploads disabled. Try contacting " . $settings->admindetails["name"] . ", your site Administrator. <a href='javascript:history.back();'>Go back</a>.</p>"));
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if(!$env->is_logged_in)
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>You are not currently logged in, so you can't upload anything.</p>
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<p>Try <a href='?action=login&returnto=" . rawurlencode("?action=upload") . "'>logging in</a> first.</p>"));
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exit(page_renderer::render("Upload - $settings->sitename", "<p>Select an image below, and then type a name for it in the box. This server currently supports uploads up to " . human_filesize(get_max_upload_size()) . " in size.</p>
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<p>$settings->sitename currently supports uploading of the following file types: " . implode(", ", $settings->upload_allowed_file_types) . ".</p>
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<form method='post' action='?action=upload' enctype='multipart/form-data'>
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<label for='file'>Select a file to upload.</label>
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<input type='file' name='file' />
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<br />
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<label for='name'>Name:</label>
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<input type='text' name='name' />
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<br />
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<label for='description'>Description:</label>
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<textarea name='description'></textarea>
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<br />
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<input type='submit' value='Upload' />
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</form>"));
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break;
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case "POST":
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// Recieve file
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// Make sure uploads are enabled
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if(!$settings->upload_enabled)
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{
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unlink($_FILES["file"]["tmp_name"]);
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http_response_code(412);
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exit(page_renderer::render("Upload failed - $settings->sitename", "<p>Your upload couldn't be processed because uploads are currently disabled on $settings->sitename. <a href='index.php'>Go back to the main page</a>.</p>"));
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}
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// Make sure that the user is logged in
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if(!$env->is_logged_in)
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{
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unlink($_FILES["file"]["tmp_name"]);
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http_response_code(401);
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exit(page_renderer::render("Upload failed - $settings->sitename", "<p>Your upload couldn't be processed because you are not logged in.</p><p>Try <a href='?action=login&returnto=" . rawurlencode("?action=upload") . "'>logging in</a> first."));
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}
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// Calculate the target ename, removing any characters we
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// are unsure about.
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$target_name = makepathsafe($_POST["name"]);
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$temp_filename = $_FILES["file"]["tmp_name"];
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$mimechecker = finfo_open(FILEINFO_MIME_TYPE);
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$mime_type = finfo_file($mimechecker, $temp_filename);
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finfo_close($mimechecker);
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// Perform appropriate checks based on the *real* filetype
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switch(substr($mime_type, 0, strpos($mime_type, "/")))
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{
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case "image":
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$extra_data = [];
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$imagesize = getimagesize($temp_filename, $extra_data);
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// Make sure that the image size is defined
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if(!is_int($imagesize[0]) or !is_int($imagesize[1]))
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{
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http_response_code(415);
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>The file that you uploaded doesn't appear to be an image. $settings->sitename currently only supports uploading images (videos coming soon). <a href='?action=upload'>Go back to try again</a>.</p>"));
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}
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break;
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case "video":
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http_response_code(501);
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>You uploaded a video, but $settings->sitename doesn't support them yet. Please try again later.</p>"));
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default:
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http_response_code(415);
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>You uploaded an unnknown file type which couldn't be processed. $settings->sitename thinks that the file you uploaded was a(n) '$mime_type', which isn't supported.</p>"));
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}
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$file_extension = system_mime_type_extension($mime_type);
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$new_filename = "Files/$target_name.$file_extension";
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$new_description_filename = "$new_filename.md";
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if(isset($pageindex->$new_filename))
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>A page or file has already been uploaded with the name '$new_filename'. Try deleting it first. If you do not have permission to delete things, try contacting one of the moderators.</p>"));
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if(!file_exists("Files"))
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mkdir("Files", 0664);
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if(!move_uploaded_file($temp_filename, $new_filename))
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{
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http_response_code(409);
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exit(page_renderer::render("Upload Error - $settings->sitename", "<p>The file you uploaded was valid, but $settings->sitename couldn't verify that it was tampered with during the upload process. This probably means that $settings->sitename has been attacked. Please contact " . $settings->admindetails . ", your $settings->sitename Administrator.</p>"));
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}
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file_put_contents($new_description_filename, $_POST["description"]);
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$description = $_POST["description"];
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if($settings->clean_raw_html)
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$description = htmlentities($description, ENT_QUOTES);
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file_put_contents($new_description_filename, $description);
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// Construct a new entry for the pageindex
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$entry = new stdClass();
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// Point to the description's filepath since this property
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// should point to a markdown file
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$entry->filename = $new_description_filename;
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$entry->size = strlen($description);
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$entry->lastmodified = time();
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$entry->lasteditor = $env->user;
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$entry->uploadedfile = true;
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$entry->uploadedfilepath = $new_filename;
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$entry->uploadedfilemime = $mime_type;
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// Add the new entry to the pageindex
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// Assign the new entry to the image's filepath as that
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// should be the page name.
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$pageindex->$new_filename = $entry;
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// Save the pageindex
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file_put_contents("pageindex.json", json_encode($pageindex, JSON_PRETTY_PRINT));
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header("location: ?action=view&page=$new_filename&upload=success");
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break;
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}
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});
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add_action("preview", function() {
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global $settings, $env, $pageindex;
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$filepath = $pageindex->{$env->page}->uploadedfilepath;
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$mime_type = $pageindex->{$env->page}->uploadedfilemime;
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// Determine the target size of the image
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$target_size = 512;
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if(isset($_GET["size"]))
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$target_size = intval($_GET["size"]);
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if($target_size < $settings->min_preview_size)
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$target_size = $settings->min_preview_size;
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if($target_size > $settings->max_preview_size)
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$target_size = $settings->max_preview_size;
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// Determine the output file type
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$output_mime = $settings->preview_file_type;
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if(isset($_GET["type"]) and in_array($_GET["type"], [ "image/png", "image/jpeg", "image/webp" ]))
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$output_mime = $_GET["type"];
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switch(substr($mime_type, 0, strpos($mime_type, "/")))
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{
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case "image":
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$image = false;
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switch($mime_type)
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{
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case "image/jpeg":
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$image = imagecreatefromjpeg($filepath);
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break;
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case "image/gif":
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$image = imagecreatefromgif($filepath);
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break;
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case "image/png":
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$image = imagecreatefrompng($filepath);
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break;
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case "image/webp":
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$image = imagecreatefromwebp($filepath);
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break;
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default:
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http_response_code(415);
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$image = errorimage("Unsupported image type.");
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break;
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}
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$raw_width = imagesx($image);
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$raw_height = imagesy($image);
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$preview_image = resize_image($image, $target_size);
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header("content-type: $output_mime");
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switch($output_mime)
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{
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case "image/jpeg":
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imagejpeg($preview_image);
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break;
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case "image/png":
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imagepng($preview_image);
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break;
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default:
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case "image/webp":
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imagewebp($preview_image);
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break;
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}
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imagedestroy($preview_image);
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break;
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default:
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http_response_code(501);
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exit("Unrecognised file type.");
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}
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});
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page_renderer::register_part_preprocessor(function(&$parts) {
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global $pageindex, $env, $settings;
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// Todo add the preview to the top of the page here, but only if the current action is view and we are on a page that is a file
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if(isset($pageindex->{$env->page}->uploadedfile) and $pageindex->{$env->page}->uploadedfile == true)
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{
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// We are looking at a page that is paired with an uploaded file
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$filepath = $pageindex->{$env->page}->uploadedfilepath;
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$mime_type = $pageindex->{$env->page}->uploadedfilemime;
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$preview_sizes = [ 256, 512, 768, 1024, 1536 ];
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$preview_html = "<figure class='preview'>
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<img src='?action=preview&size=$settings->default_preview_size&page=" . rawurlencode($env->page) . "' />
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<nav class='image-controls'>
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<ul><li><a href='$filepath'>🌄 Original image</a></li>
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<li>Other Sizes: ";
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foreach($preview_sizes as $size)
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$preview_html .= "<a href='?action=preview&size='$size>$size" . "px</a> ";
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$preview_html .= "</li></ul></nav>
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</figure>
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<h2>File Information</h2>
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<table><tr><th>Name</th><td>" . str_replace("File/", "", $filepath) . "</td>
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<tr><th>Type</th><td>$mime_type</td></tr>
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<tr><th>Size</th><td>" . human_filesize(filesize($filepath)) . "</td></tr>
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<tr><th>Uploaded by</th><td>" . $pageindex->{$env->page}->lasteditor . "</td></tr></table>
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<h2>Description</h2>";
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$parts["{content}"] = str_replace("</h1>", "</h1>\n$preview_html", $parts["{content}"]);
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}
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});
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}
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]);
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//// Pair of functions to calculate the actual maximum upload size supported by the server
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//// Lifted from Drupal by @meustrus from Stackoverflow. Link to answer:
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//// http://stackoverflow.com/a/25370978/1460422
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// Returns a file size limit in bytes based on the PHP upload_max_filesize
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// and post_max_size
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function get_max_upload_size()
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{
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static $max_size = -1;
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if ($max_size < 0) {
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// Start with post_max_size.
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$max_size = parse_size(ini_get('post_max_size'));
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// If upload_max_size is less, then reduce. Except if upload_max_size is
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// zero, which indicates no limit.
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$upload_max = parse_size(ini_get('upload_max_filesize'));
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if ($upload_max > 0 && $upload_max < $max_size) {
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$max_size = $upload_max;
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}
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}
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return $max_size;
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}
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function parse_size($size) {
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$unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
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$size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
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if ($unit) {
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// Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
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return round($size * pow(1024, stripos('bkmgtpezy', $unit[0])));
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} else {
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return round($size);
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}
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}
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function errorimage($text)
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{
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$width = 640;
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$height = 480;
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$image = imagecreatetruecolor($width, $height);
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imagefill($image, 0, 0, imagecolorallocate($image, 238, 232, 242)); // Set the background to #eee8f2
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$fontwidth = imagefontwidth(3);
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imagetext($image, 3,
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($width / 2) - (($fontwidth * strlen($text)) / 2),
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($height / 2) - (imagefontheight(3) / 2),
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$text,
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imagecolorallocate($image, 17, 17, 17) // #111111
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);
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return $image;
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}
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function resize_image($image, $size)
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{
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$cur_width = imagesx($image);
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$cur_height = imagesy($image);
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if($cur_width < $size and $cur_height < $size)
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return $image;
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$width_ratio = $size / $cur_width;
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$height_ratio = $size / $cur_height;
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$ratio = min($width_ratio, $height_ratio);
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$new_height = floor($cur_height * $ratio);
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$new_width = floor($cur_width * $ratio);
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header("x-resize-to: $new_width x $new_height\n");
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return imagescale($image, $new_width, $new_height);
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}
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?>
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