new plugin(CorruptMp4s): Mp4s with infinite/negative duration

1 files changed, 104 insertions, 0 deletions

diff --git a/src/plugins/corruptMp4s.ts b/src/plugins/corruptMp4s.ts
new file mode 100644
index 0000000..aefff67
--- /dev/null
+++ b/src/plugins/corruptMp4s.ts
@@ -0,0 +1,104 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { ApplicationCommandOptionType, sendBotMessage } from "../api/Commands";
+import { findOption } from "../api/Commands/commandHelpers";
+import { ApplicationCommandInputType } from "../api/Commands/types";
+import { Devs } from "../utils/constants";
+import definePlugin from "../utils/types";
+import { findByCode, findByProps } from "../webpack";
+
+const DRAFT_TYPE = 0;
+
+export default definePlugin({
+    name: "CorruptMp4s",
+    description: "Create corrupt mp4s with extremely high or negative duration",
+    authors: [Devs.Ven],
+    commands: [{
+        name: "corrupt",
+        description: "Create a corrupt mp4 with extremely high or negative duration",
+        inputType: ApplicationCommandInputType.BUILT_IN,
+        options: [
+            {
+                name: "mp4",
+                description: "the video to corrupt",
+                type: ApplicationCommandOptionType.ATTACHMENT,
+                required: true
+            },
+            {
+                name: "kind",
+                description: "the kind of corruption",
+                type: ApplicationCommandOptionType.STRING,
+                choices: [
+                    {
+                        name: "infinite",
+                        value: "infinite",
+                        label: "Very high duration"
+                    },
+                    {
+                        name: "negative",
+                        value: "negative",
+                        label: "Negative duration"
+                    }
+                ]
+            }
+        ],
+        execute: async (args, ctx) => {
+            const UploadStore = findByProps("getUploads");
+            const upload = UploadStore.getUploads(ctx.channel.id, DRAFT_TYPE)[0];
+
+            const video = upload?.item?.file as File | undefined;
+
+            if (video?.type !== "video/mp4")
+                return void sendBotMessage(ctx.channel.id, {
+                    content: "Please upload a mp4 file"
+                });
+
+            const corruption = findOption(args, "kind", "negative");
+
+            const buf = new Uint8Array(await video.arrayBuffer());
+            let found = false;
+
+            // adapted from https://github.com/GeopJr/exorcism/blob/c9a12d77ccbcb49c987b385eafae250906efc297/src/App.svelte#L41-L48
+            for (let i = 0; i < buf.length; i++) {
+                if (buf[i] === 0x6d && buf[i + 1] === 0x76 && buf[i + 2] === 0x68 && buf[i + 3] === 0x64) {
+                    let start = i + 18;
+                    buf[start++] = 0x00;
+                    buf[start++] = 0x01;
+                    buf[start++] = corruption === "negative" ? 0xff : 0x7f;
+                    buf[start++] = 0xff;
+                    buf[start++] = 0xff;
+                    buf[start++] = corruption === "negative" ? 0xf0 : 0xff;
+                    found = true;
+                    break;
+                }
+            }
+
+            if (!found) {
+                return void sendBotMessage(ctx.channel.id, {
+                    content: "Could not find signature. Is this even a mp4?"
+                });
+            }
+
+            const newName = video.name.replace(/\.mp4$/i, ".corrupt.mp4");
+            const promptToUpload = findByCode("UPLOAD_FILE_LIMIT_ERROR");
+            const file = new File([buf], newName, { type: "video/mp4" });
+            setImmediate(() => promptToUpload([file], ctx.channel, DRAFT_TYPE));
+        }
+    }]
+});