1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
// 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;
}
// Data from the client's request to /orders/{id}
interface Req {
orderId: string;
contractHash?: string;
claimToken?: string;
sessionId?: string;
accept: "json" | "html";
}
// (Abstract) response to /orders/{id}
interface Resp {
httpStatus: string;
// Schema type of the response
responseType: string;
// Additional details about response
response?: any;
}
// Abstracted merchant database
type MerchantOrderStore = { [orderId: string]: MerchantOrderInfo };
// Logic for /orders/{id}
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) {
const hcOk = ord.contractHash === req.contractHash;
if (!hcOk && ord.requireClaimToken && ord.claimToken !== req.claimToken) {
// Client is trying to get the order status of a claimed,
// unpaid order. However, the client is not showing authentication.
//
// This can happen when the fulfillment URL includes the order ID,
// and the storefront redirects the user to the backend QR code
// page, because the order is not paid under the current session.
// This happens on bookmarking / link sharing.
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: {
public_reorder_url: ord.publicReorderUrl,
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",
};
}
// Helper to find an already paid order ID.
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;
}
|
