flagship.js

function convertCampaignVariationIntoCacheKey(
  usecases,
  separatorCV,
  separatorEach
) {
  return usecases
    .map((uc) => `${uc.campaignId}${separatorCV}${uc.variationId}`)
    .join(separatorEach);
}

async function fetchExperienceCacheKey(r) {
  //ngx.log(ngx.WARN, JSON.stringify(r.headersIn));
  r.headersOut["X-fs-experiences"] = "optout";
  try {
    let reply = await ngx.fetch(
      `https://decision.flagship.io/v2/${r.variables.fs_env_id}/campaigns?mode=simple&exposeAllKeys=true`,
      {
        method: "POST",
        body: JSON.stringify({
          visitor_id: "@Madi-Ji",
          context: {
            github: "Madi-Ji/flagship-x-nginx-proxy-cache",
          },
          visitor_consent: false,
          trigger_hit: false,
        }),
        headers: {
          "x-api-key": r.variables.fs_api_key,
        },
      }
    );

    if (reply.status !== 200) throw reply.status;

    let json = await reply.json();
    let cacheKey = convertCampaignVariationIntoCacheKey(
      json.campaignsVariation,
      ":",
      "|"
    );
    // Most of the work is done here.
    r.headersOut["X-fs-experiences"] = cacheKey;
  } catch (e) {
    r.error(`[Flagship] NJS Fetch encounter following error : ${e.toString()}`);
  }
  r.return(204);
  return;
}

export default { fetchExperienceCacheKey };