experiment: back to school event (user)

// Discord Archive assignment check: reads only the experiment assignments Discord already has and copies them to the clipboard. It does not read login data or send anything.
(() => {
  const target = {"apex":false,"hash":4009274680,"unit":null,"text":{"noStore":"Could not find Discord's assignment store. Reload Discord, wait until you are logged in, and run it again.","found":"Assignment for this experiment:","missing":"This account has no assignment for this experiment.","notEligible":"Not eligible","unassigned":"no variant assigned","noApex":"No Apex assignments could be read.","unitCounts":"user units {user}, installation units {installation}","multipleUnits":"Apex assignments mixing several accounts or devices were left out.","empty":"Discord has not received any assignments yet. Run it again once Discord has fully loaded.","skipped":"{count} assignments with an unexpected shape were left out.","copied":"Copied {count} assignments to the clipboard. Paste them into \"Paste result\" on Discord Archive.","notCopied":"Clipboard copy is unavailable. Select and copy the result below."}};
  const requires = [];
  webpackChunkdiscord_app.push([[Symbol()], {}, (require) => { requires.push(require); }]);
  webpackChunkdiscord_app.pop();
  // 스토어 이름(displayName)이 정확히 같은 것만 모은다. 아무 속성이나 함수로 돌려주는 객체를 저장소로 오인하지 않는다.
  const found = { ExperimentStore: [], ApexExperimentStore: [], AuthenticationStore: [] };
  for (const require of requires) {
    for (const module of Object.values(require.c || {})) {
      try {
        for (const value of Object.values(module.exports || {})) {
          const name = value && value.constructor && value.constructor.displayName;
          if (typeof name === "string" && Object.prototype.hasOwnProperty.call(found, name) && !found[name].includes(value)) found[name].push(value);
        }
      } catch {}
    }
  }
  const size = (object) => (object && typeof object === "object" ? Object.keys(object).length : 0);
  const measure = (read) => { try { return read(); } catch { return -1; } };
  // 같은 이름이 여럿이면 자료가 가장 많은 것을 쓴다.
  const pick = (list, amount) => list
    .map((store) => [store, measure(() => amount(store))])
    .filter(([, value]) => value >= 0)
    .sort((left, right) => right[1] - left[1])
    .map(([store]) => store)[0] || null;
  const apexRows = (store) => Object.values((store.getState() || {}).evaluatedExperiments || {})
    .reduce((sum, units) => sum + Object.values(units || {}).reduce((total, unit) => total + size(unit && unit.assignments), 0), 0);
  const userStore = pick(found.ExperimentStore.filter((store) => typeof store.getAllUserExperimentDescriptors === "function"), (store) => size(store.getAllUserExperimentDescriptors()));
  const apexStore = pick(found.ApexExperimentStore.filter((store) => typeof store.getState === "function"), apexRows);
  const authStore = found.AuthenticationStore.find((store) => typeof store.getId === "function") || null;
  const env = window.GLOBAL_ENV || {};
  const channel = ["stable", "ptb", "canary"].includes(env.RELEASE_CHANNEL) ? env.RELEASE_CHANNEL : undefined;
  // 데스크톱 앱은 DiscordNative를 둔다. 있는지만 보고 호출하지 않는다.
  const platform = typeof window.DiscordNative === "undefined" ? "web" : "desktop";
  const result = { platform, release_channel: channel, assignments: null };
  let message;
  let count = 0;
  let skipped = 0;
  if (!target.apex) {
    if (!userStore) return target.text.noStore;
    const all = userStore.getAllUserExperimentDescriptors() || {};
    const entries = Object.entries(all);
    // 이 사이트의 파서가 받는 모양만 넣고, 뺀 수는 결과에 알린다.
    result.assignments = entries
      .filter(([hash, item]) => item && Number.isInteger(Number(hash)) && Number.isInteger(item.revision) && Number.isInteger(item.bucket))
      .map(([hash, item]) => [Number(hash), item.revision, item.bucket, item.override ? 0 : null, null, null, item.aaMode ? 1 : 0]);
    count = result.assignments.length;
    skipped = entries.length - count;
    const mine = all[String(target.hash)];
    const label = !mine ? "" : mine.bucket === -1 ? target.text.notEligible : mine.bucket === 0 ? "Control" : "Treatment " + mine.bucket;
    message = mine
      ? target.text.found + " " + label + " · revision " + mine.revision + (mine.override ? " · override" : "") + (mine.aaMode ? " · A/A" : "")
      : target.text.missing;
  } else {
    if (!apexStore) return target.text.noStore;
    const evaluated = (apexStore.getState() || {}).evaluatedExperiments || {};
    // Discord처럼 user 단위는 현재 계정 ID로 고른다. 보존된 이전 세션 단위가 남을 수 있기 때문이다. ID는 결과에 넣지 않는다.
    let currentId = null;
    try { currentId = authStore ? authStore.getId() : null; } catch {}
    const surfaces = {};
    const unitCounts = {};
    let mine = null;
    let mixed = false;
    for (const [unitType, surface] of [["user", "1"], ["installation", "2"]]) {
      const units = evaluated[unitType] || {};
      const keys = Object.keys(units);
      unitCounts[unitType] = keys.length;
      let unit = null;
      if (unitType === "user" && currentId != null) unit = units[String(currentId)] || null;
      else if (keys.length === 1) unit = units[keys[0]];
      else if (keys.length > 1) mixed = true;
      if (!unit) continue;
      const rows = unit.assignments || {};
      const entries = Object.entries(rows);
      const list = entries
        .filter(([hash, item]) => item && Number.isInteger(Number(hash)))
        .map(([hash, item]) => [Number(hash), item.variantId ?? null, item.isOverride ? 1 : 0, item.revision ?? null]);
      skipped += entries.length - list.length;
      // 계정·기기 ID 대신 고정 이름을 쓴다.
      surfaces[surface] = { self: { assignments: list } };
      count += list.length;
      const hit = rows[String(target.hash)];
      if (hit && (target.unit === null || target.unit === unitType)) mine = hit;
    }
    if (Object.keys(surfaces).length === 0) {
      const counts = target.text.unitCounts.replace("{user}", String(unitCounts.user)).replace("{installation}", String(unitCounts.installation));
      return target.text.noApex + " (" + counts + ")" + (mixed ? " " + target.text.multipleUnits : "");
    }
    result.assignments = surfaces;
    message = mine
      ? target.text.found + " " + (mine.variantId == null ? target.text.unassigned : "Variant " + mine.variantId) + " · revision " + (mine.revision ?? "?") + (mine.isOverride ? " · override" : "")
      : target.text.missing;
    if (mixed) message += " " + target.text.multipleUnits;
  }
  const skippedNote = skipped > 0 ? " " + target.text.skipped.replace("{count}", String(skipped)) : "";
  // 아직 배정을 받지 않은 탭이면 빈 결과를 복사하지 않는다.
  if (count === 0) return target.text.empty + skippedNote;
  const text = JSON.stringify(result);
  if (typeof copy === "function") {
    copy(text);
    return message + "\n" + target.text.copied.replace("{count}", String(count)) + skippedNote;
  }
  return message + "\n" + target.text.notCopied + skippedNote + "\n" + text;
})()