created getSurveyByID function and corresponding API endpoint

src/app/api/surveys/[surveyId]/route.ts

@@ -0,0 +1,18 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getSurveyByID } from "@/lib/firebase/database/surveys";
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: { surveyId: string } }
+) {
+  const { surveyId } = params;
+  try {
+    const survey = await getSurveyByID(surveyId);
+    return NextResponse.json({ data: survey }, { status: 200 });
+  } catch (err) {
+    return NextResponse.json(
+      { error: "error getting survey by id" },
+      { status: 500 }
+    );
+  }
+}

src/lib/firebase/database/surveys.ts

@@ -1,6 +1,7 @@
+import { Survey } from '@/types/survey-types';
 import { forms } from '../../googleAuthorization';
 import { db } from "../firebaseConfig";
-import { doc, setDoc } from 'firebase/firestore';
+import { doc, getDoc, setDoc } from 'firebase/firestore';
 
 export async function createSurvey(body: {title: string, documentTitle: string}) {
   let form = null;
@@ -42,4 +43,13 @@ export async function updateSurvey(id: string) {
   } catch (err) {
     throw Error('unable to update survey in firestore');
   }
+}
+
+export async function getSurveyByID(id: string) {
+  try {
+    const snapshot = await getDoc(doc(db, 'surveys', id));
+    return snapshot.exists() ? snapshot.data() as Survey : null
+  } catch (err) {
+    throw Error('survey with given id not found')
+  }
 }