feat: added paper upload function (#37)

Author: Zain-ul-din

src/lib/pastpaper/upload.ts

@@ -0,0 +1,45 @@
+import { UserDocType } from "../firebase_doctypes";
+import { pastPapersCol, uploadBlobToFirestore } from "../firebase";
+import { fileToBlob } from "../util";
+import { PastPaperDocType } from "./types";
+import { doc, serverTimestamp, setDoc } from "firebase/firestore";
+
+interface UploadProps {
+  file: File | null
+  currUser: UserDocType,
+  subject_name: string;
+}
+
+export default async function upload(
+  { file, subject_name, currUser }: UploadProps
+) {
+  if(!file) return;
+  
+  // todo: validate file input via gemini OR may be try some free otpion
+
+  try {
+    const photo_url = await uploadBlobToFirestore(fileToBlob(file))
+    
+    const docRef = doc(pastPapersCol);
+    const docData: PastPaperDocType = {
+      photo_url,
+      uid: docRef.id,
+      subject_name,
+      upload_at: serverTimestamp(),
+      uploader: {
+        displayName: currUser.displayName,
+        photoURL: currUser.photoURL,
+        uid: currUser.uid
+      },
+      votes_count: 0,
+      uploader_uid: currUser.uid
+    } 
+
+    await setDoc(docRef, docData)
+    
+  } catch(err) {
+    return false;
+  }
+
+  return true
+}