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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177import type { Installation } from "./installation-metadata.ts";import { domainFail, domainIdentifier, type DomainRecord,} from "./domain-metadata.ts";
const identifier = (value: unknown): value is string => typeof value === "string" && /^[a-f0-9]{32}$/.test(value);export async function domainJson(response: Response): Promise<any> { const reader = response.body?.getReader(); if (!reader) domainFail("temporarily_unavailable"); let text = ""; let size = 0; const decoder = new TextDecoder(); while (true) { const chunk = await reader.read(); if (chunk.done) break; size += chunk.value.byteLength; if (size > 128 * 1024) { await reader.cancel(); domainFail("temporarily_unavailable"); } text += decoder.decode(chunk.value, { stream: true }); } try { return JSON.parse(text + decoder.decode()); } catch { return domainFail("temporarily_unavailable"); }}
// Fixed provider endpoints; the token never leaves this operation's call stack.export class DomainAPI { constructor( private readonly token: string, private readonly record: Installation, private readonly network: typeof fetch = fetch, ) {} private async request( path: string, method = "GET", body?: unknown, missing = false, ) { const network = this.network; let response; try { response = await network(`https://api.cloudflare.com/client/v4/${path}`, { method, redirect: "manual", signal: AbortSignal.timeout(15_000), headers: { Authorization: `Bearer ${this.token}`, ...(body === undefined ? {} : { "Content-Type": "application/json" }), }, ...(body === undefined ? {} : { body: JSON.stringify(body) }), }); } catch { return domainFail("temporarily_unavailable"); } if (response.status === 401) domainFail("reauthorization_required"); if (response.status === 403) domainFail("account_denied"); if (response.status === 404 && missing) return null; if ([400, 409].includes(response.status)) domainFail("resource_conflict"); if (!response.ok) domainFail("temporarily_unavailable"); const envelope = await domainJson(response); if (envelope?.success !== true || !("result" in envelope)) domainFail("temporarily_unavailable"); return envelope; } async zones() { const zones: { id: string; name: string }[] = []; for (let page = 1; page <= 20; page++) { const result = await this.request( `zones?account.id=${this.record.accountId}&status=active&per_page=50&page=${page}`, ); if (!Array.isArray(result.result)) domainFail("temporarily_unavailable"); for (const zone of result.result) { if ( !identifier(zone.id) || typeof zone.name !== "string" || zone.account?.id !== this.record.accountId || zone.status !== "active" ) domainFail("account_denied"); zones.push({ id: zone.id, name: zone.name }); } if (!result.result_info || result.result_info.total_pages <= page) return zones; } return domainFail("temporarily_unavailable"); } async zone(zoneId: string, hostname: string) { const { result: zone } = await this.request(`zones/${zoneId}`); if ( zone.id !== zoneId || zone.account?.id !== this.record.accountId || zone.status !== "active" ) domainFail("account_denied"); if ( typeof zone.name !== "string" || !(hostname === zone.name || hostname.endsWith(`.${zone.name}`)) ) domainFail("invalid_hostname"); } private get domainsPath() { return `accounts/${this.record.accountId}/workers/domains`; } private verify(value: any, domain: DomainRecord) { if ( !domainIdentifier.safeParse(value?.id).success || value.hostname !== domain.hostname || value.zone_id !== domain.zoneId || value.service !== this.record.resources.workerName || (value.environment && value.environment !== "production") ) domainFail("resource_conflict"); return value.id as string; } async find(domain: DomainRecord): Promise<string | null> { const envelope = await this.request( `${this.domainsPath}?hostname=${encodeURIComponent(domain.hostname)}`, ); if ( !Array.isArray(envelope.result) || envelope.result.length > 1 || (envelope.result_info?.total_pages ?? 1) > 1 ) domainFail("resource_conflict"); if (!envelope.result.length) return null; return this.verify(envelope.result[0], domain); } async preflight(domain: DomainRecord) { await this.zone(domain.zoneId, domain.hostname); if (await this.find(domain)) domainFail("resource_conflict"); const { result } = await this.request( `zones/${domain.zoneId}/dns_records?name=${encodeURIComponent(domain.hostname)}&per_page=1`, ); if (!Array.isArray(result) || result.length) domainFail("resource_conflict"); } async attach(domain: DomainRecord) { if (!domain.writeIntent || domain.domainId) domainFail("resource_conflict"); // Wrangler's native records interface provides commit-time conflict guards. // Preserve domains outside this request, and NEVER opt into DNS/Worker takeover. await this.request( `accounts/${this.record.accountId}/workers/scripts/${this.record.resources.workerName}/domains/records`, "PUT", { override_scope: false, override_existing_origin: false, override_existing_dns_record: false, origins: [{ hostname: domain.hostname, zone_id: domain.zoneId }], }, ); } async remove(domain: DomainRecord) { // No write was attempted: abandoning a failed preflight must not detach // someone else's pre-existing hostname, even if it targets this Worker. if (!domain.writeIntent) return; if (!domain.domainId) domainFail("attachment_outcome_unknown"); const found = await this.find(domain); if (!found) return; if (domain.domainId && found !== domain.domainId) domainFail("resource_conflict"); await this.request( `${this.domainsPath}/${found}`, "DELETE", undefined, true, ); if (await this.find(domain)) domainFail("temporarily_unavailable"); }}