| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { combineLatest } from 'rxjs';
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| 9 | import { filter, map, scan, startWith, switchMap, take } from 'rxjs/operators';
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| 10 | import { isUrlTree } from '../utils/type_guards';
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| 11 | const INITIAL_VALUE = Symbol('INITIAL_VALUE');
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| 12 | export function prioritizedGuardValue() {
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| 13 | return switchMap(obs => {
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| 14 | return combineLatest(obs.map(o => o.pipe(take(1), startWith(INITIAL_VALUE))))
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| 15 | .pipe(scan((acc, list) => {
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| 16 | let isPending = false;
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| 17 | return list.reduce((innerAcc, val, i) => {
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| 18 | if (innerAcc !== INITIAL_VALUE)
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| 19 | return innerAcc;
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| 20 | // Toggle pending flag if any values haven't been set yet
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| 21 | if (val === INITIAL_VALUE)
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| 22 | isPending = true;
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| 23 | // Any other return values are only valid if we haven't yet hit a pending
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| 24 | // call. This guarantees that in the case of a guard at the bottom of the
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| 25 | // tree that returns a redirect, we will wait for the higher priority
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| 26 | // guard at the top to finish before performing the redirect.
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| 27 | if (!isPending) {
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| 28 | // Early return when we hit a `false` value as that should always
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| 29 | // cancel navigation
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| 30 | if (val === false)
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| 31 | return val;
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| 32 | if (i === list.length - 1 || isUrlTree(val)) {
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| 33 | return val;
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| 34 | }
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| 35 | }
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| 36 | return innerAcc;
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| 37 | }, acc);
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| 38 | }, INITIAL_VALUE), filter(item => item !== INITIAL_VALUE), map(item => isUrlTree(item) ? item : item === true), //
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| 39 | take(1));
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| 40 | });
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| 41 | }
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| 42 | //# 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