Handle corrected and original MD5s

src/events/handle-message.ts

@@ -70,21 +70,27 @@ export async function handleMessageCreate(message: Message) {
     const match = md5Regex.exec(attachment.name);
     md5Regex.lastIndex = 0;
 
-    let md5;
+    const md5s: string[] = [];
 
-    if (match) md5 = match[1];
+    if (match) md5s.push(match[1]);
     else if (ALLOWED_MIMETYPES.includes(attachment.contentType!)) {
-      md5 = await calculateMD5FromURL(attachment.url);
+      const md5Data = await calculateMD5FromURL(attachment.url);
+      if (!md5Data) continue;
+      md5s.push(md5Data.correctedFileMD5, md5Data.originalFileMD5);
     }
 
-    if (!md5) continue;
+    if (md5s.length == 0) continue;
 
-    const post = await getE621PostByMd5(md5);
+    for (const md5 of md5s) {
+      const post = await getE621PostByMd5(md5);
 
-    if (post) {
-      if (await blacklistIfNecessary(message, [post])) return;
+      if (post) {
+        if (await blacklistIfNecessary(message, [post])) return;
 
-      responses.push(`<${getPostUrl(post)}>`);
+        responses.push(`<${getPostUrl(post)}>`);
+
+        continue;
+      }
     }
   }
 

src/utils/file-utils.ts

@@ -14,7 +14,7 @@ export function calculateMD5(data: Buffer): string {
   return crypto.createHash('md5').update(data).digest('hex');
 }
 
-export async function downloadFile(url: string): Promise<Buffer | null> {
+export async function downloadFile(url: string): Promise<Buffer[] | null> {
   try {
     const res = await fetch(url);
 
@@ -44,18 +44,22 @@ export async function downloadFile(url: string): Promise<Buffer | null> {
       finalData = Buffer.from(data);
     }
 
-    return finalData;
+    return [finalData, Buffer.from(data)];
   } catch (e) {
     console.error(e);
     return null;
   }
 }
 
-export async function calculateMD5FromURL(url: string): Promise<string | null> {
+export async function calculateMD5FromURL(url: string): Promise<{ correctedFileMD5: string, originalFileMD5: string } | null> {
   try {
-    const file = await downloadFile(url);
-    if (!file) return null;
-    return calculateMD5(file);
+    const files = await downloadFile(url);
+    if (!files) return null;
+
+    return {
+      correctedFileMD5: calculateMD5(files[0]),
+      originalFileMD5: calculateMD5(files[1])
+    };
   } catch (e) {
     console.error(e);
     return null;