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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 {
EMPTY,
Observable,
catchError,
defaultIfEmpty,
map,
of,
tap
} from "rxjs"
import { configuration } from "~/_"
import { getElements, requestXML } from "~/browser"
/* ----------------------------------------------------------------------------
* Types
* ------------------------------------------------------------------------- */
/**
* Sitemap, i.e. a list of URLs
*/
export type Sitemap = string[]
/* ----------------------------------------------------------------------------
* Helper functions
* ------------------------------------------------------------------------- */
/**
* Preprocess a list of URLs
*
* This function replaces the `site_url` in the sitemap with the actual base
* URL, to allow instant navigation to work in occasions like Netlify previews.
*
* @param urls - URLs
*
* @returns URL path parts
*/
function preprocess(urls: Sitemap): Sitemap {
if (urls.length < 2)
return [""]
/* Take the first two URLs and remove everything after the last slash */
const [root, next] = [...urls]
.sort((a, b) => a.length - b.length)
.map(url => url.replace(/[^/]+$/, ""))
/* Compute common prefix */
let index = 0
if (root === next)
index = root.length
else
while (root.charCodeAt(index) === next.charCodeAt(index))
index++
/* Remove common prefix and return in original order */
return urls.map(url => url.replace(root.slice(0, index), ""))
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Fetch the sitemap for the given base URL
*
* @param base - Base URL
*
* @returns Sitemap observable
*/
export function fetchSitemap(base?: URL): Observable<Sitemap> {
const cached = __md_get<Sitemap>("__sitemap", sessionStorage, base)
if (cached) {
return of(cached)
} else {
const config = configuration()
return requestXML(new URL("sitemap.xml", base || config.base))
.pipe(
map(sitemap => preprocess(getElements("loc", sitemap)
.map(node => node.textContent!)
)),
catchError(() => EMPTY), // @todo refactor instant loading
defaultIfEmpty([]),
tap(sitemap => __md_set("__sitemap", sitemap, sessionStorage, base))
)
}
}
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