Add first iteration of the Image DB editor

module/utils/fs.mjs

@@ -1,7 +1,33 @@
-import { __ID__, filePath } from "../consts.mjs";
+import { __ID__, devMode, filePath } from "../consts.mjs";
 
 const { fetchJsonWithTimeout } = foundry.utils;
 
+/**
+ * Returns a pseudo-hash for a file. If the browser is in a secure
+ * context this will return a true SHA-1 hash of the file, otherwise
+ * a random ID is generated using the character set A-Za-z0-9.
+ *
+ * @param {File} file The file to hash
+ */
+export async function hashFile(file) {
+	// Handle fallback when hashing isn't possible
+	if (!window.isSecureContext || !crypto.subtle.digest) {
+		return foundry.utils.randomID(40);
+	};
+
+	// Actually hash the file since we can
+	const bytes = await file.arrayBuffer();
+	const buffer = await crypto.subtle.digest(`SHA-1`, bytes);
+
+	const intArray = new Uint8Array(buffer);
+	if (Uint8Array.prototype.toHex) {
+		return intArray.toHex();
+	};
+	return Array.from(intArray)
+		.map(b => b.toString(16).padStart(2, `0`))
+		.join(``);
+};
+
 export async function lastModifiedAt(path) {
 	try {
 		const response = await fetch(filePath(path), { method: `HEAD` });
@@ -24,6 +50,22 @@ export async function getFile(path) {
  * @param {any} data
  */
 export async function uploadJson(path, filename, data) {
+	const content = JSON.stringify(
+		data,
+		undefined,
+		devMode() ? `\t` : undefined,
+	);
+	try {
+		const file = new File(
+			[content],
+			filename,
+			{ type: `text/plain` },
+		);
+		await uploadFile(path, file);
+	} catch {};
+};
+
+export async function uploadFile(path, file) {
 
 	// uploadPersistent adds "storage" into the path automatically
 	if (path.startsWith(`storage/`)) {
@@ -35,11 +77,6 @@ export async function uploadJson(path, filename, data) {
 
 	const picker = foundry.applications.apps.FilePicker.implementation;
 	try {
-		const file = new File(
-			[JSON.stringify(data)],
-			filename,
-			{ type: `text/plain` },
-		);
 		await picker.uploadPersistent(
 			__ID__,
 			path,
@@ -47,3 +84,12 @@ export async function uploadJson(path, filename, data) {
 		);
 	} catch {};
 };
+
+export function determineFileExtension(file) {
+	for (const [short, long] of Object.entries(CONST.IMAGE_FILE_EXTENSIONS)) {
+		if (long === file.type) {
+			return short;
+		};
+	};
+	return null;
+};