ow-mod-db/fetch-mods/get-view-counts.ts

import { BetaAnalyticsDataClient } from "@google-analytics/data";

const ga4PropertyId = 251990931;
const routeBase = "outerwildsmods.com/mods/";
const routeRegex = new RegExp(`${routeBase}[^\/]+\/$`);

export async function getViewCounts(
  base64GoogleServiceAccountCredentials: string
) {
  try {
    const googleServiceAccountCredentials = Buffer.from(
      base64GoogleServiceAccountCredentials,
      "base64"
    ).toString();

    const analyticsDataClient = new BetaAnalyticsDataClient({
      credentials: JSON.parse(googleServiceAccountCredentials),
      projectId: "outer-wilds-mods",
    });

    const [result] = await analyticsDataClient.runReport({
      property: `properties/${ga4PropertyId}`,
      dimensions: [
        {
          name: "fullPageUrl",
        },
      ],
      dateRanges: [
        {
          startDate: "30daysAgo",
          endDate: "yesterday",
        },
      ],
      metrics: [
        {
          name: "screenPageViews",
        },
      ],
      metricAggregations: [1],
    });

    if (!result.rows) {
      console.log("empty rows returned");
      return;
    }

    const output = result.rows.reduce<Record<string, number>>((record, row) => {
      if (!row.dimensionValues || !row.metricValues) return record;

      const route = row.dimensionValues[0]?.value;

      if (
        !route ||
        route.length <= routeBase.length ||
        !routeRegex.test(route)
      ) {
        return record;
      }

      const key = route.slice(routeBase.length, -1);

      const value = Number.parseInt(row.metricValues[0]?.value ?? "");

      if (isNaN(value)) return record;

      return {
        ...record,
        [key]: value,
      };
    }, {});
    return output;
  } catch (error) {
    console.log(`Error getting view counts: ${error}`);
    return {};
  }
}