nexarch/web/connect-setup/lib/api.ts

// Duenner Client fuer API-01 (connect/internal/connectorsetupapi) — enthaelt
// keine eigene Geschaeftslogik, nur Datenabruf/-versand. Identitaet kommt
// uebergangsweise (wie bei web/connect-status vor der zentralen
// Core-JWT-Anbindung) aus Umgebungsvariablen, die als Header durchgereicht
// werden.

export class UnauthorizedError extends Error {}
export class ApiError extends Error {}

function apiBase(): string {
  const base = process.env.NEXT_PUBLIC_CONNECT_API_URL;
  if (!base) {
    throw new Error("NEXT_PUBLIC_CONNECT_API_URL ist nicht gesetzt (Umgebungsvariable erforderlich)");
  }
  return base;
}

function identityHeaders(): Record<string, string> {
  const userID = process.env.NEXT_PUBLIC_USER_ID;
  const tenant = process.env.NEXT_PUBLIC_TENANT_SLUG;
  const headers: Record<string, string> = {};
  if (userID) headers["X-User-Id"] = userID;
  if (tenant) headers["X-Tenant-Slug"] = tenant;
  return headers;
}

async function req<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${apiBase()}${path}`, {
    ...init,
    headers: {
      ...identityHeaders(),
      ...(init?.body ? { "Content-Type": "application/json" } : {}),
      ...init?.headers,
    },
  });
  if (res.status === 401) {
    throw new UnauthorizedError("Anmeldung erforderlich, um Connectoren einzurichten.");
  }
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new ApiError(body.error ?? `Anfrage fehlgeschlagen (${res.status})`);
  }
  return res.json().catch(() => undefined as T);
}

export type CredentialKind = "oauth2" | "api_key";

export interface FieldDef {
  nexarch_field: string;
  required: boolean;
}

export interface Entry {
  nexarch_field: string;
  external_field: string;
}

export interface ConnectorType {
  id: string;
  display_name: string;
  credential_kind: CredentialKind;
  schema: FieldDef[];
}

export interface Connection {
  connector_type: string;
  connector_type_label: string;
  connector_instance_id: string;
  credential_kind: CredentialKind;
  masked_credential: string;
  expires_at?: string;
  updated_at: string;
}

export interface MappingView {
  schema: FieldDef[];
  fields: Entry[];
  version: number;
}

export function fetchCatalog(): Promise<ConnectorType[]> {
  return req("/connectors/catalog");
}

export function fetchConnections(): Promise<Connection[]> {
  return req("/connectors/connections");
}

export interface SetConnectionInput {
  kind: CredentialKind;
  api_key?: string;
  access_token?: string;
  refresh_token?: string;
  expires_at?: string;
}

export function setConnection(connectorType: string, instanceID: string, input: SetConnectionInput): Promise<Connection> {
  return req(`/connectors/connections/${encodeURIComponent(connectorType)}/${encodeURIComponent(instanceID)}`, {
    method: "PUT",
    body: JSON.stringify(input),
  });
}

export function fetchMapping(connectorType: string, instanceID: string): Promise<MappingView> {
  return req(`/connectors/connections/${encodeURIComponent(connectorType)}/${encodeURIComponent(instanceID)}/mapping`);
}

export function saveMapping(connectorType: string, instanceID: string, fields: Entry[]): Promise<MappingView> {
  return req(`/connectors/connections/${encodeURIComponent(connectorType)}/${encodeURIComponent(instanceID)}/mapping`, {
    method: "PUT",
    body: JSON.stringify({ fields }),
  });
}