Refactor/unify temp image handling

utils/tempimages.js

@@ -0,0 +1,66 @@
+import * as logger from "../utils/logger.js";
+import { readdir, lstat, rm, writeFile } from "fs/promises";
+
+export async function upload(client, result, context, interaction = false) {
+  const filename = `${Math.random().toString(36).substring(2, 15)}.${result.name.split(".")[1]}`;
+  await writeFile(`${process.env.TEMPDIR}/${filename}`, result.file);
+  const imageURL = `${process.env.TMP_DOMAIN || "https://tmp.projectlounge.pw"}/${filename}`;
+  const payload = {
+    embeds: [{
+      color: 16711680,
+      title: "Here's your image!",
+      url: imageURL,
+      image: {
+        url: imageURL
+      },
+      footer: {
+        text: "The result image was more than 8MB in size, so it was uploaded to an external site instead."
+      },
+    }]
+  };
+  if (interaction) {
+    await context[context.acknowledged ? "editOriginalMessage" : "createMessage"](payload);
+  } else {
+    await client.createMessage(context.channel.id, Object.assign(payload, {
+      messageReference: {
+        channelID: context.channel.id,
+        messageID: context.id,
+        guildID: context.channel.guild ? context.channel.guild.id : undefined,
+        failIfNotExists: false
+      },
+      allowedMentions: {
+        repliedUser: false
+      }
+    }));
+  }
+  if (process.env.THRESHOLD) {
+    process.env.DIRSIZECACHE += result.file.length;
+    await removeOldImages();
+  }
+}
+
+export async function removeOldImages() {
+  if (process.env.DIRSIZECACHE > process.env.THRESHOLD) {
+    const files = (await readdir(process.env.TEMPDIR)).map((file) => {
+      return lstat(`${process.env.TEMPDIR}/${file}`).then((stats) => {
+        if (stats.isSymbolicLink()) return;
+        return {
+          name: file,
+          size: stats.size,
+          ctime: stats.ctime
+        };
+      });
+    }).filter(Boolean);
+    const resolvedFiles = await Promise.all(files);
+    process.env.DIRSIZECACHE = resolvedFiles.reduce((a, b)=>{
+      return a + b.size;
+    }, 0);
+    const oldestFiles = resolvedFiles.sort((a, b) => a.ctime - b.ctime);
+    while (process.env.DIRSIZECACHE > process.env.THRESHOLD) {
+      await rm(`${process.env.TEMPDIR}/${oldestFiles[0].name}`);
+      process.env.DIRSIZECACHE -= oldestFiles[0].size;
+      logger.log(`Removed oldest image file: ${oldestFiles[0].name}`);
+      oldestFiles.shift();
+    }
+  }
+}