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
|
/*
This file is part of GNU Taler
(C) 2020 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Imports.
*/
import { RequestThrottler, TalerErrorCode } from "@gnu-taler/taler-util";
import {
Headers,
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
TalerError,
} from "@gnu-taler/taler-wallet-core";
/**
* An implementation of the [[HttpRequestLibrary]] using the
* browser's XMLHttpRequest.
*/
export class ServiceWorkerHttpLib implements HttpRequestLibrary {
private throttle = new RequestThrottler();
private throttlingEnabled = true;
async fetch(
requestUrl: string,
options?: HttpRequestOptions,
): Promise<HttpResponse> {
const requestMethod = options?.method ?? "GET";
const requestBody = options?.body;
const requestHeader = options?.headers;
if (this.throttlingEnabled && this.throttle.applyThrottle(requestUrl)) {
const parsedUrl = new URL(requestUrl);
throw TalerError.fromDetail(
TalerErrorCode.WALLET_HTTP_REQUEST_THROTTLED,
{
requestMethod,
requestUrl,
throttleStats: this.throttle.getThrottleStats(requestUrl),
},
`request to origin ${parsedUrl.origin} was throttled`,
);
}
const response = await fetch(requestUrl, {
headers: requestHeader,
body: requestBody,
method: requestMethod,
// timeout: options?.timeout
});
const headerMap = new Headers();
response.headers.forEach((value, key) => {
headerMap.set(key, value);
});
return {
headers: headerMap,
status: response.status,
requestMethod,
requestUrl,
json: makeJsonHandler(response, requestUrl),
text: makeTextHandler(response, requestUrl),
bytes: async () => (await response.blob()).arrayBuffer(),
};
}
get(url: string, opt?: HttpRequestOptions): Promise<HttpResponse> {
return this.fetch(url, {
method: "GET",
...opt,
});
}
postJson(
url: string,
body: any,
opt?: HttpRequestOptions,
): Promise<HttpResponse> {
return this.fetch(url, {
method: "POST",
body: JSON.stringify(body),
...opt,
});
}
stop(): void {
// Nothing to do
}
}
function makeTextHandler(response: Response, requestUrl: string) {
return async function getJsonFromResponse(): Promise<any> {
let respText;
try {
respText = await response.text();
} catch (e) {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
return respText;
};
}
function makeJsonHandler(response: Response, requestUrl: string) {
return async function getJsonFromResponse(): Promise<any> {
let responseJson;
try {
responseJson = await response.json();
} catch (e) {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
if (responseJson === null || typeof responseJson !== "object") {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
{
requestUrl,
httpStatusCode: response.status,
},
"Invalid JSON from HTTP response",
);
}
return responseJson;
};
}
|
