create getReadUrl

src/puter-js/src/modules/FileSystem/index.js

@@ -16,6 +16,7 @@ import symlink from './operations/symlink.js';
 import deleteFSEntry from "./operations/deleteFSEntry.js";
 import { AdvancedBase } from '../../../../putility/index.js';
 import FSItem from '../FSItem.js';
+import getReadUrl from './operations/getReadUrl.js';
 
 export class PuterJSFileSystemModule extends AdvancedBase {
 
@@ -32,7 +33,8 @@ export class PuterJSFileSystemModule extends AdvancedBase {
     write = write;
     sign = sign;
     symlink = symlink;
-    
+    getReadUrl = getReadUrl;
+
     FSItem = FSItem
 
     static NARI_METHODS = {

src/puter-js/src/modules/FileSystem/operations/getReadUrl.js

@@ -0,0 +1,42 @@
+import * as utils from '../../../lib/utils.js';
+import stat from "./stat.js";
+
+const getReadUrl = async function (path, expiresIn = "24h") {
+    return new Promise(async (resolve, reject) => {
+        // If auth token is not provided and we are in the web environment, 
+        // try to authenticate with Puter
+        if (!puter.authToken && puter.env === 'web') {
+            try {
+                await puter.ui.authenticateWithPuter();
+            } catch (e) {
+                // if authentication fails, throw an error
+                reject('Authentication failed.');
+            }
+        }
+        try {
+            const { uid, is_dir } = (await stat.call(this, path))
+            if (is_dir) {
+                reject("Cannot create readUrl for directory");
+                return;
+            }
+
+            const xhr = utils.initXhr('/auth/create-access-token', this.APIOrigin, this.authToken);
+            
+            utils.setupXhrEventHandlers(xhr, () => {}, () => {}, ({token})=> {
+                resolve(`${this.APIOrigin}/token-read?uid=${encodeURIComponent(uid)}&token=${encodeURIComponent(token)}`)
+            }, reject);
+
+            xhr.send(JSON.stringify({
+                expiresIn,
+                permissions: [
+                    `fs:${uid}:read`,
+                ]
+            }))
+
+        } catch (e) {
+            reject(e)
+        }
+    });
+}
+
+export default getReadUrl;