Add upload backend

endpoints/upload.php

@@ -0,0 +1,14 @@
+<?php
+
+require_once "lib/upload.php";
+
+function endpoint($endpoint_data): array
+{
+
+    return match ($endpoint_data["action"]) {
+        "getMyFiles" => listFiles(),
+        "getAllFiles" => listFiles(false),
+        "UploadFiles" => parseIncomingFiles(),
+        default => ["Status" => "Fail", "message" => "Invalid action"],
+    };
+}

lib/upload.php

@@ -0,0 +1,180 @@
+<?php
+
+function makePathSafe($userInput): string
+{
+    // Keep only alphanumeric characters, underscores, and hyphens
+    $safeString = preg_replace('/[^\w\-]/', '', $userInput);
+
+    // Ensure no path traversal
+    $safeString = str_replace('..', '_', $safeString);
+
+    // Trim leading/trailing underscores
+    $safeString = trim($safeString, '_');
+
+    // Replace directory separator characters with underscores
+    $safeString = str_replace(['/', '\\'], '_', $safeString);
+
+    // Limit length for safety
+    return substr($safeString, 0, 255);
+}
+
+function getIncomingFiles(): array
+{
+    $files = $_FILES;
+    $files2 = [];
+    foreach ($files as $infoArr) {
+        $filesByInput = [];
+        foreach ($infoArr as $key => $valueArr) {
+            if (is_array($valueArr)) { // file input "multiple"
+                foreach ($valueArr as $i => $value) {
+                    $filesByInput[$i][$key] = $value;
+                }
+            } else { // -> string, normal file input
+                $filesByInput[] = $infoArr;
+                break;
+            }
+        }
+        $files2 = array_merge($files2, $filesByInput);
+    }
+    $files3 = [];
+    foreach ($files2 as $file) { // let's filter empty & errors
+        if (!$file['error']) $files3[] = $file;
+    }
+    return $files3;
+}
+
+function saveUploadedFileInDatabase($filePath, $fileType):bool
+{
+    global $mysqli;
+    $stmt = $mysqli->prepare("INSERT INTO Files (Path, Type, UploadedBy, UploadedAt) VALUES (?, ?, ?, NOW())");
+    $stmt->bind_param("ssi", $filePath, $fileType, $_SESSION["ID"]);
+    $stmt->execute();
+    $stat = $stmt->affected_rows > 0;
+    $stmt->close();
+    return $stat;
+}
+
+function doImageUpload($inFile, $outFile): bool
+{
+    // Create Imagick object
+    $imagick = new Imagick($inFile);
+
+    // Set the desired format for reencoding (WebP)
+    $imagick->setImageFormat('webp');
+
+    // Remove non-essential metadata
+    $imagick->stripImage();
+
+    // Write the reencoded image to the output file
+    $imagick->writeImage($outFile);
+
+    // Destroy the Imagick object to free up resources
+    $imagick->destroy();
+
+    // Check if the reencoding was successful
+    if (file_exists($outFile)) {
+        return saveUploadedFileInDatabase($outFile, 'image/webp');
+    } else {
+        return false;
+    }
+}
+
+function listFiles($onlyMine = true):array
+{
+    $output = ["Status" => "Fail"];
+    require_once "lib/account.php";
+    if(($onlyMine && isLoggedIn()) || (!$onlyMine && isModerator())) {
+        global $mysqli;
+        $query = "SELECT ID, Path, Type, UploadedAt, UploadedBy FROM Files";
+
+        if($onlyMine){
+            $query .= " WHERE UploadedBy = ?";
+        }
+
+        $stmt = $mysqli->prepare($query);
+        if($onlyMine) {
+            $stmt->bind_param("i", $_SESSION["ID"]);
+        }
+
+        $id = 0;
+        $path = "";
+        $type = "";
+        $uploadedAt = "";
+        $uploadedBy = 0;
+
+        $stmt->bind_result($id, $path, $type, $uploadedAt, $uploadedBy);
+
+        $stmt->execute();
+
+        // Fetch the results into the bound variables
+        while ($stmt->fetch()) {
+            $files[] = [
+                'ID' => $id,
+                'Path' => $path,
+                'Type' => $type,
+                'UploadedAt' => $uploadedAt,
+                'UploadedBy' => $uploadedBy,
+            ];
+        }
+
+        // Check if any results were fetched
+        if (!empty($files)) {
+            $output["Status"] = "Success";
+            $output["Files"] = $files;
+        }
+
+        $stmt->close();
+    }
+
+    return $output;
+
+}
+
+function parseIncomingFiles(): array
+{
+    $incomingFiles = getIncomingFiles();
+    $success = true;
+
+    foreach ($incomingFiles as $incomingFile) {
+        if ($incomingFile["error"] == 0 && is_file($incomingFile["tmp_name"])) {
+            $type = explode("/", $incomingFile["type"]);
+            switch ($type) {
+                case "image":
+                    $imgFname = pathinfo($incomingFile["name"], PATHINFO_FILENAME);
+                    $uploadPath = getUploadPath("image", $imgFname);
+                    if(!empty($uploadPath)) {
+                        if (!doImageUpload($incomingFile["tmp_name"], $uploadPath)) {
+                            $success = false;
+                        }
+                    }
+                    else{
+                        $success = false;
+                    }
+                    break;
+            }
+        }
+    }
+    $output = ["Status" => "Fail"];
+    if($success){
+        $output["Status"] = "Success";
+    }
+    return $output;
+}
+
+function getUploadPath($type = "unknown", $filename = "hehe"): string
+{
+    $type = makePathSafe($type);
+    $id = makePathSafe($_SESSION["ID"]);
+    $date = makePathSafe(date("Y/m/d"));
+    $filename = makePathSafe($filename);
+    $extension = match ($type) {
+        'image' => 'webp',
+        default => 'dummy',
+    };
+    if($extension != "dummy") {
+        return "uploads/$type/$id/$date/$filename.$extension";
+    }
+    else {
+        return "";
+    }
+}