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use std::iter::once;
use anyhow::Result;
use turbo_rcstr::{RcStr, rcstr};
use turbo_tasks::{ResolvedVc, TryJoinIterExt, Vc};
use turbopack_core::introspect::{Introspectable, IntrospectableChildren};
use super::{
ContentSource, ContentSourceContent, ContentSourceData, ContentSourceDataVary,
GetContentSourceContent,
route_tree::{BaseSegment, RouteTree, RouteTrees},
};
use crate::source::{ContentSources, route_tree::MapGetContentSourceContent};
/// Binds different ContentSources to different subpaths.
///
/// The request path must begin with the prefix, which will be stripped (along with the subpath)
/// before querying the ContentSource. A fallback ContentSource will serve all
/// other subpaths, including if the request path does not include the prefix.
#[turbo_tasks::value(shared)]
pub struct PrefixedRouterContentSource {
pub prefix: ResolvedVc<RcStr>,
pub routes: Vec<(RcStr, ResolvedVc<Box<dyn ContentSource>>)>,
pub fallback: ResolvedVc<Box<dyn ContentSource>>,
}
#[turbo_tasks::value_impl]
impl PrefixedRouterContentSource {
#[turbo_tasks::function]
pub fn new(
prefix: ResolvedVc<RcStr>,
routes: Vec<(RcStr, ResolvedVc<Box<dyn ContentSource>>)>,
fallback: ResolvedVc<Box<dyn ContentSource>>,
) -> Vc<Self> {
PrefixedRouterContentSource {
prefix,
routes,
fallback,
}
.cell()
}
}
fn get_children(
routes: &[(RcStr, ResolvedVc<Box<dyn ContentSource>>)],
fallback: &ResolvedVc<Box<dyn ContentSource>>,
) -> Vc<ContentSources> {
Vc::cell(
routes
.iter()
.map(|r| r.1)
.chain(std::iter::once(*fallback))
.collect(),
)
}
async fn get_introspection_children(
routes: &[(RcStr, ResolvedVc<Box<dyn ContentSource>>)],
fallback: &ResolvedVc<Box<dyn ContentSource>>,
) -> Result<Vc<IntrospectableChildren>> {
Ok(Vc::cell(
routes
.iter()
.cloned()
.chain(std::iter::once((RcStr::default(), *fallback)))
.filter_map(|(path, source)| {
ResolvedVc::try_sidecast::<Box<dyn Introspectable>>(source).map(|i| (path, i))
})
.collect(),
))
}
#[turbo_tasks::value_impl]
impl ContentSource for PrefixedRouterContentSource {
#[turbo_tasks::function]
async fn get_routes(&self) -> Result<Vc<RouteTree>> {
let prefix = &*self.prefix.await?;
if cfg!(debug_assertions) {
debug_assert!(prefix.is_empty() || prefix.ends_with('/'));
debug_assert!(!prefix.starts_with('/'));
}
let prefix = if prefix.is_empty() {
Vec::new()
} else {
BaseSegment::from_static_pathname(prefix.as_str()).collect()
};
let inner_trees = self.routes.iter().map(|(path, source)| {
let prepended_base = prefix
.iter()
.cloned()
.chain(BaseSegment::from_static_pathname(path))
.collect();
source
.get_routes()
.with_prepended_base(prepended_base)
.map_routes(Vc::upcast(
PrefixedRouterContentSourceMapper {
prefix: self.prefix,
path: path.clone(),
}
.cell(),
))
});
Ok(Vc::<RouteTrees>::cell(
inner_trees
.chain(once(self.fallback.get_routes()))
.map(|v| async move { v.to_resolved().await })
.try_join()
.await?,
)
.merge())
}
#[turbo_tasks::function]
fn get_children(&self) -> Vc<ContentSources> {
get_children(&self.routes, &self.fallback)
}
}
#[turbo_tasks::value]
struct PrefixedRouterContentSourceMapper {
prefix: ResolvedVc<RcStr>,
path: RcStr,
}
#[turbo_tasks::value_impl]
impl MapGetContentSourceContent for PrefixedRouterContentSourceMapper {
#[turbo_tasks::function]
fn map_get_content(
self: ResolvedVc<Self>,
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
) -> Vc<Box<dyn GetContentSourceContent>> {
Vc::upcast(
PrefixedRouterGetContentSourceContent {
mapper: self,
get_content,
}
.cell(),
)
}
}
#[turbo_tasks::value]
struct PrefixedRouterGetContentSourceContent {
mapper: ResolvedVc<PrefixedRouterContentSourceMapper>,
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
}
#[turbo_tasks::value_impl]
impl GetContentSourceContent for PrefixedRouterGetContentSourceContent {
#[turbo_tasks::function]
fn vary(&self) -> Vc<ContentSourceDataVary> {
self.get_content.vary()
}
#[turbo_tasks::function]
async fn get(&self, path: RcStr, data: ContentSourceData) -> Result<Vc<ContentSourceContent>> {
let prefix = self.mapper.await?.prefix.await?;
if let Some(path) = path.strip_prefix(&**prefix) {
if path.is_empty() {
return Ok(self.get_content.get(RcStr::default(), data));
} else if prefix.is_empty() {
return Ok(self.get_content.get(path.into(), data));
} else if let Some(path) = path.strip_prefix('/') {
return Ok(self.get_content.get(path.into(), data));
}
}
Ok(ContentSourceContent::not_found())
}
}
#[turbo_tasks::value_impl]
impl Introspectable for PrefixedRouterContentSource {
#[turbo_tasks::function]
fn ty(&self) -> Vc<RcStr> {
Vc::cell(rcstr!("prefixed router content source"))
}
#[turbo_tasks::function]
async fn details(&self) -> Result<Vc<RcStr>> {
let prefix = self.prefix.await?;
Ok(Vc::cell(format!("prefix: '{prefix}'").into()))
}
#[turbo_tasks::function]
async fn children(&self) -> Result<Vc<IntrospectableChildren>> {
get_introspection_children(&self.routes, &self.fallback).await
}
}
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