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// Merchant's DB state for one particular order.
// Invariants:
// paid => claimed
// claimed => !!contractHash
// requireClaimToken => !!claimToken
// !!lastPaidSessionId => paid
interface MerchantOrderInfo {
orderId: string;
requireClaimToken: boolean;
claimToken?: string;
contractHash?: string;
claimed: boolean;
paid: boolean;
fulfillmentUrl?: string;
publicReorderUrl?: string;
lastPaidSessionId?: string;
}
interface Req {
orderId: string;
contractHash?: string;
claimToken?: string;
sessionId?: string;
accept: "json" | "html";
}
interface Resp {
httpStatus: string;
responseType: string;
// Additional details about response
response?: any;
}
type MerchantOrderStore = { [orderId: string]: MerchantOrderInfo };
function handlePublicOrdersGet(mos: MerchantOrderStore, req: Req): Resp {
const ord = mos[req.orderId];
if (!ord) {
return {
httpStatus: "404 Not Found",
responseType: "TalerErrorResponse",
};
}
if (!ord.claimed) {
if (ord.requireClaimToken && ord.claimToken !== req.claimToken) {
return {
httpStatus: "403 Forbidden",
responseType: "TalerErrorResponse",
};
}
return {
httpStatus: "402 Payment Required",
responseType: "StatusUnpaidResponse",
response: {
fulfillmentUrl: ord.fulfillmentUrl,
// FIXME: do we include claim token here?
talerPayUri: "taler://pay/",
},
};
}
if (!ord.paid) {
if (ord.requireClaimToken && ord.claimToken !== req.claimToken) {
// This can happen when the fulfillment URL page detects
// the user has not paid under the current session.
return {
httpStatus: "202 Accepted",
responseType: "StatusGotoResponse",
response: {
public_reorder_url: ord.publicReorderUrl,
},
};
}
return {
httpStatus: "402 Payment Required",
responseType: "StatusUnpaidResponse",
response: {
fulfillmentUrl: ord.fulfillmentUrl,
// FIXME: do we include claim token here?
talerPayUri: "taler://pay/",
},
};
}
// Here, we know that the order is paid for.
// But we still need the ord.claimToken, because
// the QR code page will poll until it gets a
// fulfillment URL, but we decided that the
// fulfillment URL should only be returned
// when the client is authenticated.
// (Otherwise, guessing the order ID might leak the
// fulfillment URL).
const authOk =
ord.contractHash === req.contractHash ||
(ord.requireClaimToken && ord.claimToken === req.claimToken);
if (authOk) {
if (!!req.sessionId && req.sessionId !== ord.lastPaidSessionId) {
const alreadyPaidOrd = findAlreadyPaid(mos, req.sessionId);
if (alreadyPaidOrd) {
return {
httpStatus: "202 Accepted",
responseType: "StatusGotoResponse",
response: {
already_paid_order_id: alreadyPaidOrd.orderId,
}
}
}
return {
httpStatus: "402 Payment Required",
responseType: "StatusUnpaidResponse",
response: {
fulfillmentUrl: ord.fulfillmentUrl,
// TO DISCUSS: do we include claim token here?
talerPayUri: "taler://pay/",
},
};
}
return {
httpStatus: "200 OK",
responseType: "StatusPaidResponse",
response: {
fulfillmentUrl: ord.fulfillmentUrl,
},
};
}
return {
httpStatus: "403 Forbidden",
responseType: "TalerErrorResponse",
};
}
function findAlreadyPaid(
mos: MerchantOrderStore,
sessionId: string
): MerchantOrderInfo | undefined {
for (const orderId of Object.keys(mos)) {
if (mos[orderId].lastPaidSessionId === sessionId) {
return mos[orderId];
}
}
return undefined;
}
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