Add suggested chapter names

src/routes/getChapterNames.ts

@@ -0,0 +1,46 @@
+import { Logger } from "../utils/logger";
+import { Request, Response } from "express";
+import { db } from "../databases/databases";
+import { Postgres } from "../databases/Postgres";
+
+export async function getChapterNames(req: Request, res: Response): Promise<Response> {
+    const description = req.query.description as string;
+    const channelID = req.query.channelID as string;
+
+    if (!description || typeof(description) !== "string"
+            || !channelID || typeof(channelID) !== "string") {
+        return res.sendStatus(400);
+    }
+
+    if (!(db instanceof Postgres)) {
+        return res.sendStatus(500).json({
+            message: "Not supported on this instance"
+        });
+    }
+
+    try {
+        const descriptions = await db.prepare("all", `
+            SELECT "description"
+            FROM "sponsorTimes"
+            WHERE ("votes" > 0 OR ("views" > 100 AND "votes" >= 0)) AND "videoID" IN (
+                SELECT "videoID"
+                FROM "videoInfo"
+                WHERE "channelID" = ?
+            ) AND "description" != ''
+            GROUP BY "description"
+            ORDER BY SUM("votes"), similarity("description", ?) DESC
+            LIMIT 5;`
+        , [channelID, description]) as { description: string }[];
+
+        if (descriptions?.length > 0) {
+            return res.status(200).json(descriptions.map(d => ({
+                description: d.description
+            })));
+        }
+    } catch (err) {
+        Logger.error(err as string);
+        return res.sendStatus(500);
+    }
+
+    return res.status(404).json([]);
+}