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Expand relative URLs in HTML elements in Markdown (#1491)

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Jonatan Kłosko 2022-10-17 13:00:25 +02:00 committed by GitHub
parent 2063cf9485
commit ba193be13b
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1 changed files with 24 additions and 18 deletions
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42
assets/js/lib/markdown.js
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@ -58,10 +58,10 @@ class Markdown {
.use(remarkMath)
.use(remarkPrepareMermaid)
.use(remarkSyntaxHiglight, { highlight })
.use(remarkExpandUrls, { baseUrl: this.baseUrl })
// We keep the HTML nodes, parse with rehype-raw and then sanitize
.use(remarkRehype, { allowDangerousHtml: true })
.use(rehypeRaw)
.use(rehypeExpandUrls, { baseUrl: this.baseUrl })
.use(rehypeSanitize, sanitizeSchema())
.use(rehypeKatex)
.use(rehypeMermaid)
@ -139,32 +139,38 @@ function remarkSyntaxHiglight(options) {
// Expands relative URLs against the given base url
// and deals with ".." in URLs
function remarkExpandUrls(options) {
function rehypeExpandUrls(options) {
return (ast) => {
if (options.baseUrl) {
visit(ast, "link", (node) => {
if (
node.url &&
!isAbsoluteUrl(node.url) &&
!isInternalUrl(node.url) &&
!isPageAnchor(node.url)
) {
node.url = urlAppend(options.baseUrl, node.url);
}
});
visit(ast, "element", (node) => {
if (node.tagName === "a" && node.properties) {
const url = node.properties.href;
visit(ast, "image", (node) => {
if (node.url && !isAbsoluteUrl(node.url) && !isInternalUrl(node.url)) {
node.url = urlAppend(options.baseUrl, node.url);
if (
url &&
!isAbsoluteUrl(url) &&
!isInternalUrl(url) &&
!isPageAnchor(url)
) {
node.properties.href = urlAppend(options.baseUrl, url);
}
}
if (node.tagName === "img" && node.properties) {
const url = node.properties.src;
if (url && !isAbsoluteUrl(url) && !isInternalUrl(url)) {
node.properties.src = urlAppend(options.baseUrl, url);
}
}
});
}
// Browser normalizes URLs with ".." so we use a "__parent__"
// modifier instead and handle it on the server
visit(ast, "link", (node) => {
if (node.url) {
node.url = node.url
visit(ast, "element", (node) => {
if (node.tagName === "a" && node.properties && node.properties.href) {
node.properties.href = node.properties.href
.split("/")
.map((part) => (part === ".." ? "__parent__" : part))
.join("/");