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/*
* Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import {
Observable,
Subject,
map,
shareReplay,
switchMap
} from "rxjs"
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Options
*/
interface Options {
progress$?: Subject<number> // Progress subject
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Fetch the given URL
*
* If the request fails (e.g. when dispatched from `file://` locations), the
* observable will complete without emitting a value.
*
* @param url - Request URL
* @param options - Options
*
* @returns Response observable
*/
export function request(
url: URL | string, options?: Options
): Observable<Blob> {
return new Observable<Blob>(observer => {
const req = new XMLHttpRequest()
req.open("GET", `${url}`)
req.responseType = "blob"
// Handle response
req.addEventListener("load", () => {
if (req.status >= 200 && req.status < 300) {
observer.next(req.response)
observer.complete()
} else {
observer.error(new Error(req.statusText))
}
})
// Handle network errors
req.addEventListener("error", () => {
observer.error(new Error("Network Error"))
})
// Handle aborted requests
req.addEventListener("abort", () => {
observer.error(new Error("Request aborted"))
})
// Handle download progress
if (typeof options?.progress$ !== "undefined") {
req.addEventListener("progress", event => {
options.progress$!.next((event.loaded / event.total) * 100)
})
// Immediately set progress to 5% to indicate that we're loading
options.progress$.next(5)
}
// Send request
req.send()
})
}
/* ------------------------------------------------------------------------- */
/**
* Fetch JSON from the given URL
*
* @template T - Data type
*
* @param url - Request URL
* @param options - Options
*
* @returns Data observable
*/
export function requestJSON<T>(
url: URL | string, options?: Options
): Observable<T> {
return request(url, options)
.pipe(
switchMap(res => res.text()),
map(body => JSON.parse(body) as T),
shareReplay(1)
)
}
/**
* Fetch XML from the given URL
*
* @param url - Request URL
* @param options - Options
*
* @returns Data observable
*/
export function requestXML(
url: URL | string, options?: Options
): Observable<Document> {
const dom = new DOMParser()
return request(url, options)
.pipe(
switchMap(res => res.text()),
map(res => dom.parseFromString(res, "text/xml")),
shareReplay(1)
)
}
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