Refactor file system electron event handling

electron/index.js

@@ -55,8 +55,8 @@ function createWindow() {
         autoHideMenuBar: true,
         webPreferences: {
             nodeIntegration: false,
-            webSecurity: false,
-            // sandbox: true,
+            webSecurity: true,
+            sandbox: true,
             contextIsolation: true,
             preload: path.join(__dirname, "preload.js"),
         },
@@ -229,70 +229,33 @@ async function writeFileSafe(filename, contents) {
     });
 }
 
-async function performFsJob(job) {
-    const fname = path.join(storePath, job.filename);
-
+ipcMain.handle("fs-job", async (event, job) => {
+    const filenameSafe = job.filename.replace(/[^a-z\.\-_0-9]/i, "");
+    const fname = path.join(storePath, filenameSafe);
     switch (job.type) {
         case "read": {
             if (!fs.existsSync(fname)) {
-                return {
                 // Special FILE_NOT_FOUND error code
-                    error: "file_not_found",
-                };
-            }
-
-            try {
-                const data = await fs.promises.readFile(fname, "utf8");
-                return {
-                    success: true,
-                    data,
-                };
-            } catch (ex) {
-                return {
-                    error: ex,
-                };
+                return { error: "file_not_found" };
             }
+            return await fs.promises.readFile(fname, "utf8");
         }
         case "write": {
-            try {
             await writeFileSafe(fname, job.contents);
-                return {
-                    success: true,
-                    data: job.contents,
-                };
-            } catch (ex) {
-                return {
-                    error: ex,
-                };
-            }
+            return job.contents;
         }
 
         case "delete": {
-            try {
             await fs.promises.unlink(fname);
-            } catch (ex) {
-                return {
-                    error: ex,
-                };
-            }
-
-            return {
-                success: true,
-                data: null,
-            };
+            return;
         }
 
         default:
             throw new Error("Unknown fs job: " + job.type);
     }
-}
-
-ipcMain.on("fs-job", async (event, arg) => {
-    const result = await performFsJob(arg);
-    event.reply("fs-response", { id: arg.id, result });
 });
 
-ipcMain.on("open-mods-folder", async () => {
+ipcMain.handle("open-mods-folder", async () => {
     shell.openPath(modsPath);
 });
 

electron/preload.js

@@ -1,3 +1,7 @@
 const { contextBridge, ipcRenderer } = require("electron");
 
-contextBridge.exposeInMainWorld("ipcRenderer", ipcRenderer);
+contextBridge.exposeInMainWorld("ipcRenderer", {
+    invoke: ipcRenderer.invoke.bind(ipcRenderer),
+    on: ipcRenderer.on.bind(ipcRenderer),
+    send: ipcRenderer.send.bind(ipcRenderer),
+});

electron_wegame/index.js

@@ -49,9 +49,12 @@ function createWindow() {
         // fullscreen: true,
         autoHideMenuBar: true,
         webPreferences: {
-            nodeIntegration: true,
-            webSecurity: false,
-            contextIsolation: false,
+            nodeIntegration: false,
+            webSecurity: true,
+            sandbox: true,
+
+            contextIsolation: true,
+            preload: path.join(__dirname, "preload.js"),
         },
         allowRunningInsecureContent: false,
     });
@@ -165,20 +168,20 @@ async function writeFileSafe(filename, contents) {
         console.warn(prefix, "Concurrent write process on", filename);
     }
 
-    await fileLock.acquire(filename, async () => {
+    fileLock.acquire(filename, async () => {
         console.log(prefix, "Starting write on", niceFileName(filename), "in transaction", transactionId);
 
         if (!fs.existsSync(filename)) {
             // this one is easy
             console.log(prefix, "Writing file instantly because it does not exist:", niceFileName(filename));
-            fs.writeFileSync(filename, contents, { encoding: "utf8" });
+            await fs.promises.writeFile(filename, contents, "utf8");
             return;
         }
 
         // first, write a temporary file (.tmp-XXX)
         const tempName = filename + ".tmp-" + transactionId;
         console.log(prefix, "Writing temporary file", niceFileName(tempName));
-        fs.writeFileSync(tempName, contents, { encoding: "utf8" });
+        await fs.promises.writeFile(tempName, contents, "utf8");
 
         // now, rename the original file to (.backup-XXX)
         const oldTemporaryName = filename + ".backup-" + transactionId;
@@ -189,7 +192,7 @@ async function writeFileSafe(filename, contents) {
             "to",
             niceFileName(oldTemporaryName)
         );
-        fs.renameSync(filename, oldTemporaryName);
+        await fs.promises.rename(filename, oldTemporaryName);
 
         // now, rename the temporary file (.tmp-XXX) to the target
         console.log(
@@ -199,7 +202,7 @@ async function writeFileSafe(filename, contents) {
             "to the original",
             niceFileName(filename)
         );
-        fs.renameSync(tempName, filename);
+        await fs.promises.rename(tempName, filename);
 
         // we are done now, try to create a backup, but don't fail if the backup fails
         try {
@@ -208,82 +211,43 @@ async function writeFileSafe(filename, contents) {
             if (fs.existsSync(backupFileName)) {
                 console.log(prefix, "Deleting old backup file", niceFileName(backupFileName));
                 // delete the old backup
-                fs.unlinkSync(backupFileName);
+                await fs.promises.unlink(backupFileName);
             }
 
             // rename the old file to the new backup file
             console.log(prefix, "Moving", niceFileName(oldTemporaryName), "to the backup file location");
-            fs.renameSync(oldTemporaryName, backupFileName);
+            await fs.promises.rename(oldTemporaryName, backupFileName);
         } catch (ex) {
             console.error(prefix, "Failed to switch backup files:", ex);
         }
     });
 }
 
-async function performFsJob(job) {
-    const fname = path.join(storePath, job.filename);
-
+ipcMain.handle("fs-job", async (event, job) => {
+    const filenameSafe = job.filename.replace(/[^a-z\.\-_0-9]/i, "");
+    const fname = path.join(storePath, filenameSafe);
     switch (job.type) {
         case "read": {
             if (!fs.existsSync(fname)) {
-                return {
                 // Special FILE_NOT_FOUND error code
-                    error: "file_not_found",
-                };
-            }
-
-            try {
-                const data = fs.readFileSync(fname, { encoding: "utf8" });
-                return {
-                    success: true,
-                    data,
-                };
-            } catch (ex) {
-                console.error(ex);
-                return {
-                    error: ex,
-                };
+                return { error: "file_not_found" };
             }
+            return await fs.promises.readFile(fname, "utf8");
         }
         case "write": {
-            try {
-                writeFileSafe(fname, job.contents);
-                return {
-                    success: true,
-                    data: job.contents,
-                };
-            } catch (ex) {
-                console.error(ex);
-                return {
-                    error: ex,
-                };
-            }
+            await writeFileSafe(fname, job.contents);
+            return job.contents;
         }
 
         case "delete": {
-            try {
-                fs.unlinkSync(fname);
-            } catch (ex) {
-                console.error(ex);
-                return {
-                    error: ex,
-                };
-            }
-
-            return {
-                success: true,
-                data: null,
-            };
+            await fs.promises.unlink(fname);
+            return;
         }
 
         default:
-            throw new Error("Unkown fs job: " + job.type);
+            throw new Error("Unknown fs job: " + job.type);
     }
-}
-
-ipcMain.on("fs-job", async (event, arg) => {
-    const result = await performFsJob(arg);
-    event.sender.send("fs-response", { id: arg.id, result });
 });
+
 wegame.init(isDev);
 wegame.listen();

src/js/platform/electron/storage.js

@@ -1,29 +1,8 @@
-import { StorageInterface } from "../storage";
-import { createLogger } from "../../core/logging";
-
-const logger = createLogger("electron-storage");
+import { FILE_NOT_FOUND, StorageInterface } from "../storage";
 
 export class StorageImplElectron extends StorageInterface {
     constructor(app) {
         super(app);
-
-        /** @type {Object.<number, {resolve:Function, reject: Function}>} */
-        this.jobs = {};
-        this.jobId = 0;
-
-        ipcRenderer.on("fs-response", (event, arg) => {
-            const id = arg.id;
-            if (!this.jobs[id]) {
-                logger.warn("Got unhandled FS response, job not known:", id);
-                return;
-            }
-            const { resolve, reject } = this.jobs[id];
-            if (arg.result.success) {
-                resolve(arg.result.data);
-            } else {
-                reject(arg.result.error);
-            }
-        });
     }
 
     initialize() {
@@ -31,44 +10,32 @@ export class StorageImplElectron extends StorageInterface {
     }
 
     writeFileAsync(filename, contents) {
-        return new Promise((resolve, reject) => {
-            // ipcMain
-            const jobId = ++this.jobId;
-            this.jobs[jobId] = { resolve, reject };
-
-            ipcRenderer.send("fs-job", {
+        return ipcRenderer.invoke("fs-job", {
             type: "write",
             filename,
             contents,
-                id: jobId,
-            });
         });
     }
 
     readFileAsync(filename) {
-        return new Promise((resolve, reject) => {
-            // ipcMain
-            const jobId = ++this.jobId;
-            this.jobs[jobId] = { resolve, reject };
-
-            ipcRenderer.send("fs-job", {
+        return ipcRenderer
+            .invoke("fs-job", {
                 type: "read",
                 filename,
-                id: jobId,
-            });
+            })
+            .then(res => {
+                if (res && res.error === FILE_NOT_FOUND) {
+                    throw FILE_NOT_FOUND;
+                }
+
+                return res;
             });
     }
 
     deleteFileAsync(filename) {
-        return new Promise((resolve, reject) => {
-            // ipcMain
-            const jobId = ++this.jobId;
-            this.jobs[jobId] = { resolve, reject };
-            ipcRenderer.send("fs-job", {
+        return ipcRenderer.invoke("fs-job", {
             type: "delete",
             filename,
-                id: jobId,
-            });
         });
     }
 }

src/js/states/mods.js

@@ -116,7 +116,7 @@ export class ModsState extends TextualGameState {
             this.dialogs.showWarning(T.global.error, T.mods.folderOnlyStandalone);
             return;
         }
-        ipcRenderer.send("open-mods-folder");
+        ipcRenderer.invoke("open-mods-folder");
     }
 
     onSteamLinkClicked() {