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* Search session ID and click-referrer storage backed by sessionStorage.
*
* The search session ID rolls over after 30 minutes of inactivity. The click
* referrer captures the (session, query, result) triple at the moment the user
* clicks a search result so downstream pages (profile, host request form) can
* attribute their events back to the originating search.
*/
const SESSION_KEY = "search.session";
const REFERRER_KEY = "search.referrer";
const SESSION_TTL_MS = 30 * 60 * 1000;
interface StoredSession {
id: string;
lastActiveAt: number;
}
/**
* Random 128-bit hex string. getRandomValues() works in insecure contexts,
* unlike the other Web Crypto random helpers.
*/
function randomToken(): string {
const bytes = new Uint8Array(16);
crypto.getRandomValues(bytes);
return [...bytes].map((b) => b.toString(16).padStart(2, "0")).join("");
}
export interface SearchReferrer {
searchSessionId: string;
searchQueryId: string;
resultId: string;
userId: number;
setAt: number;
}
function readSession(): StoredSession | null {
Iif (typeof window === "undefined") return null;
try {
const raw = window.sessionStorage.getItem(SESSION_KEY);
return raw ? (JSON.parse(raw) as StoredSession) : null;
} catch {
return null;
}
}
function writeSession(s: StoredSession): void {
Iif (typeof window === "undefined") return;
try {
window.sessionStorage.setItem(SESSION_KEY, JSON.stringify(s));
} catch {
// sessionStorage unavailable (private mode, quota) — drop silently
}
}
export function getOrCreateSearchSessionId(): string {
const now = Date.now();
const existing = readSession();
if (existing && now - existing.lastActiveAt < SESSION_TTL_MS) {
writeSession({ id: existing.id, lastActiveAt: now });
return existing.id;
}
const id = randomToken();
writeSession({ id, lastActiveAt: now });
return id;
}
export function makeSearchQueryId(): string {
return randomToken();
}
export function makeResultId(
searchQueryId: string,
userId: number,
position: number,
): string {
return `${searchQueryId}:${userId}:${position}`;
}
export function setSearchReferrer(
referrer: Omit<SearchReferrer, "setAt">,
): void {
Iif (typeof window === "undefined") return;
try {
window.sessionStorage.setItem(
REFERRER_KEY,
JSON.stringify({ ...referrer, setAt: Date.now() }),
);
} catch {
// sessionStorage unavailable — drop silently
}
}
export function readSearchReferrer(userId: number): SearchReferrer | null {
Iif (typeof window === "undefined") return null;
try {
const raw = window.sessionStorage.getItem(REFERRER_KEY);
if (!raw) return null;
const parsed = JSON.parse(raw) as SearchReferrer;
if (parsed.userId !== userId) return null;
if (Date.now() - parsed.setAt > SESSION_TTL_MS) return null;
return parsed;
} catch {
return null;
}
}
export function referrerToProperties(
referrer: SearchReferrer | null,
): Record<string, unknown> {
if (!referrer) return {};
return {
referrer_search_session_id: referrer.searchSessionId,
referrer_search_query_id: referrer.searchQueryId,
referrer_result_id: referrer.resultId,
};
}
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