added file icon functions

resources/js/helpers/utils.ts

@@ -1,11 +1,50 @@
-export const isEmpty = (obj: object | string) => {
+/**
-    if (obj) {
+ * Tests if an object or string is empty.
-        if (typeof obj === "string") {
+ *
-            return obj.length == 0;
+ * @param {object|string} objOrString The object or string.
-        } else if (typeof obj == "object" && Object.keys(obj).length === 0) {
+ * @returns {boolean} If the object or string is empty.
+ */
+export const isEmpty = (objOrString: object | string): boolean => {
+    if (objOrString) {
+        if (typeof objOrString === "string") {
+            return objOrString.length == 0;
+        } else if (
+            typeof objOrString == "object" &&
+            Object.keys(objOrString).length === 0
+        ) {
             return true;
         }
     }
 
     return false;
 };
+
+/**
+ * Returns a url to a file type icon based on file name.
+ *
+ * @param {string} fileName The filename with extension.
+ * @returns {string} The url to the file type icon.
+ */
+export const getFileIconImagePath = (fileName: string): string => {
+    const ext = fileName.split(".").pop();
+    return `/img/fileicons/${ext}.png`;
+};
+
+/**
+ * Returns a url to a file preview icon based on file url.
+ *
+ * @param {string} url The url of the file.
+ * @returns {string} The url to the file preview icon.
+ */
+export const getFilePreview = (url: string): string => {
+    const ext = url.split(".").pop();
+    if (ext) {
+        if (/(gif|jpe?g|png)/i.test(ext)) {
+            return `${url}?w=200`;
+        }
+
+        return `/img/fileicons/${ext}.png`;
+    }
+
+    return "/img/fileicons/unknown.png";
+};