-
Notifications
You must be signed in to change notification settings - Fork 3.9k
/
batched-json.js
50 lines (48 loc) · 1.95 KB
/
batched-json.js
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
/**
* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {assertHttpsUrl} from './url';
import {Services} from './services';
import {getValueForExpr} from './json';
/**
* Batch fetches the JSON endpoint at the given element's `src` attribute.
* Sets the fetch credentials option from the element's `credentials` attribute,
* if it exists.
*
* @param {!./service/ampdoc-impl.AmpDoc} ampdoc
* @param {!Element} element
* @param {string=} opt_expr Dot-syntax reference to subdata of JSON result
* to return. If not specified, entire JSON result is returned.
* @return {!Promise<!JsonObject|!Array<JsonObject>>} Resolved with JSON
* result or rejected if response is invalid.
*/
export function fetchBatchedJsonFor(ampdoc, element, opt_expr) {
const url = assertHttpsUrl(element.getAttribute('src'), element);
return Services.urlReplacementsForDoc(ampdoc).expandUrlAsync(url)
.then(src => {
const opts = {};
if (element.hasAttribute('credentials')) {
opts.credentials = element.getAttribute('credentials');
} else {
opts.requireAmpResponseSourceOrigin = false;
}
return Services.batchedXhrFor(ampdoc.win).fetchJson(src, opts);
}).then(res => res.json()).then(data => {
if (data == null) {
throw new Error('Response is undefined.');
}
return getValueForExpr(data, opt_expr || '.');
});
}