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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use crate::web_worker::WebWorkerInternalHandle;use crate::web_worker::WebWorkerType;use deno_core::error::type_error;use deno_core::error::AnyError;use deno_core::op;use deno_core::url::Url;use deno_core::OpState;use deno_fetch::data_url::DataUrl;use deno_fetch::reqwest;use deno_web::BlobStore;use deno_websocket::DomExceptionNetworkError;use hyper::body::Bytes;use serde::{Deserialize, Serialize};use tokio::task::JoinHandle;
// TODO(andreubotella) Properly parse the MIME typefn 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(Serialize, Deserialize)]#[serde(rename_all = "camelCase")]pub struct SyncFetchScript {  url: String,  script: String,}
#[op]pub fn op_worker_sync_fetch(  state: &mut OpState,  scripts: Vec<String>,  mut loose_mime_checks: bool,) -> Result<Vec<SyncFetchScript>, AnyError> {  let handle = state.borrow::<WebWorkerInternalHandle>().clone();  assert_eq!(handle.worker_type, WebWorkerType::Classic);
  let client = state.borrow::<reqwest::Client>().clone();
  // 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::<BlobStore>()    .ok_or_else(|| type_error("Blob URLs are not supported in this context."))?    .clone();
  // TODO(andreubotella): make the below thread into a resource that can be  // re-used. This would allow parallel fecthing of multiple scripts.
  let thread = std::thread::spawn(move || {    let runtime = tokio::runtime::Builder::new_current_thread()      .enable_io()      .enable_time()      .build()      .unwrap();
    let handles: Vec<_> = scripts      .into_iter()      .map(|script| -> JoinHandle<Result<SyncFetchScript, AnyError>> {        let client = client.clone();        let blob_store = blob_store.clone();        runtime.spawn(async move {          let script_url = Url::parse(&script)            .map_err(|_| type_error("Invalid script URL"))?;
          let (body, mime_type, res_url) = match script_url.scheme() {            "http" | "https" => {              let resp =                client.get(script_url).send().await?.error_for_status()?;
              let res_url = resp.url().to_string();
              // 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.bytes().await?;
              (body, mime_type, res_url)            }            "data" => {              let data_url = DataUrl::process(&script)                .map_err(|e| type_error(format!("{:?}", e)))?;
              let mime_type = {                let mime = data_url.mime_type();                format!("{}/{}", mime.type_, mime.subtype)              };
              let (body, _) = data_url                .decode_to_vec()                .map_err(|e| type_error(format!("{:?}", e)))?;
              (Bytes::from(body), Some(mime_type), script)            }            "blob" => {              let blob =                blob_store.get_object_url(script_url)?.ok_or_else(|| {                  type_error("Blob for the given URL not found.")                })?;
              let mime_type = mime_type_essence(&blob.media_type);
              let body = blob.read_all().await?;
              (Bytes::from(body), Some(mime_type), script)            }            _ => {              return Err(type_error(format!(                "Classic scripts with scheme {}: are not supported in workers.",                script_url.scheme()              )))            }          };
          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(                  DomExceptionNetworkError {                    msg: format!("Invalid MIME type {:?}.", mime_type),                  }                  .into(),                )              }              None => {                return Err(                  DomExceptionNetworkError::new("Missing MIME type.").into(),                )              }            }          }
          let (text, _) = encoding_rs::UTF_8.decode_with_bom_removal(&body);
          Ok(SyncFetchScript {            url: res_url,            script: text.into_owned(),          })        })      })      .collect();
    let mut ret = Vec::with_capacity(handles.len());    for handle in handles {      let script = runtime.block_on(handle)??;      ret.push(script);    }    Ok(ret)  });
  thread.join().unwrap()}