Commit new 'surrounding' cloud function

functions/src/index.ts

@@ -1,9 +1,65 @@
 import * as functions from "firebase-functions";
+import {Storage} from "@google-cloud/storage";
+
+const storage = new Storage();
+const bucket = storage.bucket("the-office-episode-data");
+const file = bucket.file("data.json");
+let quoteData: any = null;
 
 // // Start writing Firebase Functions
 // // https://firebase.google.com/docs/functions/typescript
 
-export const helloWorld = functions.https.onRequest((request, response) => {
-  functions.logger.info("Hello logs!", {structuredData: true});
-  response.send("Hello from Firebase!");
-});
+export const surrounding = functions.https.onRequest(
+    async (request, response) => {
+        const params = {season: -1, episode: -1, scene: -1, quote: -1};
+        try {
+            params.season = Number(request.query.season);
+            params.episode = Number(request.query.episode);
+            params.scene = Number(request.query.scene);
+            params.quote = Number(request.query.quote);
+        } catch (e) {
+            response.send("Error processing parameters.").end();
+            return;
+        }
+
+        // Quote radius
+        const minRadius = 1;
+        const maxRadius = 5;
+        const defaultRadius = 2;
+        const radius = Math.min(Math.max(Number(request.query.radius) || defaultRadius, minRadius), maxRadius);
+
+        // Check that all query parameters were given correctly.
+        for (const [k, v] of Object.entries(params)) {
+            if (v == null || v == -1 || v == undefined || isNaN(v)) {
+                response.send(`Parameter '${k}' was not specified or was fed an invalid integer. (${v})`).end();
+                return;
+            }
+        }
+
+        // Load quote data if not loaded already
+        if (quoteData == null) {
+            const content = await file.download();
+            quoteData = JSON.parse(content[0].toString("utf-8"));
+        }
+
+        const sceneData: never[] = quoteData[params.season - 1][params.episode - 1]["scenes"][params.scene - 1].quotes;
+        const surrounding = {center: sceneData[params.quote - 1], above: [], below: []};
+        const quoteIndex = params.quote - 1;
+
+        if (radius > 0) {
+            for (let i = 0; i < radius; i++) {
+                const topIndex = quoteIndex - (i + 1);
+                const bottomIndex = quoteIndex + (i + 1);
+
+                if (topIndex >= 0) {
+                    surrounding.above.splice(0, 0, sceneData[topIndex]);
+                }
+
+                if (bottomIndex < sceneData.length) {
+                    surrounding.below.push(sceneData[bottomIndex]);
+                }
+            }
+        }
+
+        response.send(surrounding).end();
+    });