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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::sync::Arc;
use crate::web_worker::WebWorkerInternalHandle;
use crate::web_worker::WebWorkerType;
use deno_core::futures::StreamExt;
use deno_core::op2;
use deno_core::url::Url;
use deno_core::OpState;
use deno_fetch::data_url::DataUrl;
use deno_fetch::FetchError;
use deno_web::BlobStore;
use http_body_util::BodyExt;
use hyper::body::Bytes;
use serde::Deserialize;
use serde::Serialize;
// TODO(andreubotella) Properly parse the MIME type
fn mime_type_essence(mime_type: &str) -> String {
let essence = match mime_type.split_once(';') {
Some((essence, _)) => essence,
None => mime_type,
};
essence.trim().to_ascii_lowercase()
}
#[derive(Debug, thiserror::Error)]
pub enum SyncFetchError {
#[error("Blob URLs are not supported in this context.")]
BlobUrlsNotSupportedInContext,
#[error("{0}")]
Io(#[from] std::io::Error),
#[error("Invalid script URL")]
InvalidScriptUrl,
#[error("http status error: {0}")]
InvalidStatusCode(http::StatusCode),
#[error("Classic scripts with scheme {0}: are not supported in workers")]
ClassicScriptSchemeUnsupportedInWorkers(String),
#[error("{0}")]
InvalidUri(#[from] http::uri::InvalidUri),
#[error("Invalid MIME type {0:?}.")]
InvalidMimeType(String),
#[error("Missing MIME type.")]
MissingMimeType,
#[error(transparent)]
Fetch(#[from] FetchError),
#[error(transparent)]
Join(#[from] tokio::task::JoinError),
#[error(transparent)]
Other(deno_core::error::AnyError),
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct SyncFetchScript {
url: String,
script: String,
}
#[op2]
#[serde]
pub fn op_worker_sync_fetch(
state: &mut OpState,
#[serde] scripts: Vec<String>,
loose_mime_checks: bool,
) -> Result<Vec<SyncFetchScript>, SyncFetchError> {
let handle = state.borrow::<WebWorkerInternalHandle>().clone();
assert_eq!(handle.worker_type, WebWorkerType::Classic);
// it's not safe to share a client across tokio runtimes, so create a fresh one
// https://github.com/seanmonstar/reqwest/issues/1148#issuecomment-910868788
let options = state.borrow::<deno_fetch::Options>().clone();
let client = deno_fetch::create_client_from_options(&options)
.map_err(FetchError::ClientCreate)?;
// TODO(andreubotella) It's not good to throw an exception related to blob
// URLs when none of the script URLs use the blob scheme.
// Also, in which contexts are blob URLs not supported?
let blob_store = state
.try_borrow::<Arc<BlobStore>>()
.ok_or(SyncFetchError::BlobUrlsNotSupportedInContext)?
.clone();
// TODO(andreubotella): make the below thread into a resource that can be
// re-used. This would allow parallel fetching of multiple scripts.
let thread = std::thread::spawn(move || {
let runtime = tokio::runtime::Builder::new_current_thread()
.enable_io()
.enable_time()
.build()?;
runtime.block_on(async move {
let mut futures = scripts
.into_iter()
.map(|script| {
let client = client.clone();
let blob_store = blob_store.clone();
deno_core::unsync::spawn(async move {
let script_url = Url::parse(&script)
.map_err(|_| SyncFetchError::InvalidScriptUrl)?;
let mut loose_mime_checks = loose_mime_checks;
let (body, mime_type, res_url) = match script_url.scheme() {
"http" | "https" => {
let mut req = http::Request::new(
http_body_util::Empty::new()
.map_err(|never| match never {})
.boxed(),
);
*req.uri_mut() = script_url.as_str().parse()?;
let resp =
client.send(req).await.map_err(FetchError::ClientSend)?;
if resp.status().is_client_error()
|| resp.status().is_server_error()
{
return Err(SyncFetchError::InvalidStatusCode(resp.status()));
}
// TODO(andreubotella) Properly run fetch's "extract a MIME type".
let mime_type = resp
.headers()
.get("Content-Type")
.and_then(|v| v.to_str().ok())
.map(mime_type_essence);
// Always check the MIME type with HTTP(S).
loose_mime_checks = false;
let body = resp
.collect()
.await
.map_err(SyncFetchError::Other)?
.to_bytes();
(body, mime_type, script)
}
"data" => {
let data_url =
DataUrl::process(&script).map_err(FetchError::DataUrl)?;
let mime_type = {
let mime = data_url.mime_type();
format!("{}/{}", mime.type_, mime.subtype)
};
let (body, _) =
data_url.decode_to_vec().map_err(FetchError::Base64)?;
(Bytes::from(body), Some(mime_type), script)
}
"blob" => {
let blob = blob_store
.get_object_url(script_url)
.ok_or(FetchError::BlobNotFound)?;
let mime_type = mime_type_essence(&blob.media_type);
let body = blob.read_all().await;
(Bytes::from(body), Some(mime_type), script)
}
_ => {
return Err(
SyncFetchError::ClassicScriptSchemeUnsupportedInWorkers(
script_url.scheme().to_string(),
),
)
}
};
if !loose_mime_checks {
// TODO(andreubotella) Check properly for a Javascript MIME type.
match mime_type.as_deref() {
Some("application/javascript" | "text/javascript") => {}
Some(mime_type) => {
return Err(SyncFetchError::InvalidMimeType(
mime_type.to_string(),
))
}
None => return Err(SyncFetchError::MissingMimeType),
}
}
let (text, _) = encoding_rs::UTF_8.decode_with_bom_removal(&body);
Ok(SyncFetchScript {
url: res_url,
script: text.into_owned(),
})
})
})
.collect::<deno_core::futures::stream::FuturesUnordered<_>>();
let mut ret = Vec::with_capacity(futures.len());
while let Some(result) = futures.next().await {
let script = result??;
ret.push(script);
}
Ok(ret)
})
});
thread.join().unwrap()
}
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