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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use std::collections::HashSet;use std::fs;use std::path::Path;use std::path::PathBuf;
use deno_core::anyhow::bail;use deno_core::error::AnyError;use flate2::read::GzDecoder;use tar::Archive;use tar::EntryType;
use super::cache::with_folder_sync_lock;use super::registry::NpmPackageVersionDistInfo;use super::semver::NpmVersion;
pub fn verify_and_extract_tarball(  package: (&str, &NpmVersion),  data: &[u8],  dist_info: &NpmPackageVersionDistInfo,  output_folder: &Path,) -> Result<(), AnyError> {  if let Some(integrity) = &dist_info.integrity {    verify_tarball_integrity(package, data, integrity)?;  } else {    // todo(dsherret): check shasum here    bail!(      "Errored on '{}@{}': npm packages with no integrity are not implemented.",      package.0,      package.1,    );  }
  with_folder_sync_lock(package, output_folder, || {    extract_tarball(data, output_folder)  })}
fn verify_tarball_integrity(  package: (&str, &NpmVersion),  data: &[u8],  npm_integrity: &str,) -> Result<(), AnyError> {  use ring::digest::Context;  use ring::digest::SHA512;  let (algo, expected_checksum) = match npm_integrity.split_once('-') {    Some((hash_kind, checksum)) => {      let algo = match hash_kind {        "sha512" => &SHA512,        hash_kind => bail!(          "Not implemented hash function for {}@{}: {}",          package.0,          package.1,          hash_kind        ),      };      (algo, checksum.to_lowercase())    }    None => bail!(      "Not implemented integrity kind for {}@{}: {}",      package.0,      package.1,      npm_integrity    ),  };
  let mut hash_ctx = Context::new(algo);  hash_ctx.update(data);  let digest = hash_ctx.finish();  let tarball_checksum = base64::encode(digest.as_ref()).to_lowercase();  if tarball_checksum != expected_checksum {    bail!(      "Tarball checksum did not match what was provided by npm registry for {}@{}.\n\nExpected: {}\nActual: {}",      package.0,      package.1,      expected_checksum,      tarball_checksum,    )  }  Ok(())}
fn extract_tarball(data: &[u8], output_folder: &Path) -> Result<(), AnyError> {  fs::create_dir_all(output_folder)?;  let output_folder = fs::canonicalize(output_folder)?;  let tar = GzDecoder::new(data);  let mut archive = Archive::new(tar);  archive.set_overwrite(true);  archive.set_preserve_permissions(true);  let mut created_dirs = HashSet::new();
  for entry in archive.entries()? {    let mut entry = entry?;    let path = entry.path()?;    let entry_type = entry.header().entry_type();
    // Some package tarballs contain "pax_global_header", these entries    // should be skipped.    if entry_type == EntryType::XGlobalHeader {      continue;    }
    // skip the first component which will be either "package" or the name of the package    let relative_path = path.components().skip(1).collect::<PathBuf>();    let absolute_path = output_folder.join(relative_path);    let dir_path = if entry_type == EntryType::Directory {      absolute_path.as_path()    } else {      absolute_path.parent().unwrap()    };    if created_dirs.insert(dir_path.to_path_buf()) {      fs::create_dir_all(dir_path)?;      let canonicalized_dir = fs::canonicalize(dir_path)?;      if !canonicalized_dir.starts_with(&output_folder) {        bail!(          "Extracted directory '{}' of npm tarball was not in output directory.",          canonicalized_dir.display()        )      }    }    if entry.header().entry_type() == EntryType::Regular {      entry.unpack(&absolute_path)?;    }  }  Ok(())}
#[cfg(test)]mod test {  use super::*;  use crate::npm::semver::NpmVersion;
  #[test]  pub fn test_verify_tarball() {    let package_name = "package".to_string();    let package_version = NpmVersion::parse("1.0.0").unwrap();    let package = (package_name.as_str(), &package_version);    let actual_checksum =      "z4phnx7vul3xvchq1m2ab9yg5aulvxxcg/spidns6c5h0ne8xyxysp+dgnkhfuwvy7kxvudbeoglodj6+sfapg==";    assert_eq!(      verify_tarball_integrity(package, &Vec::new(), "test")        .unwrap_err()        .to_string(),      "Not implemented integrity kind for package@1.0.0: test",    );    assert_eq!(      verify_tarball_integrity(package, &Vec::new(), "sha1-test")        .unwrap_err()        .to_string(),      "Not implemented hash function for package@1.0.0: sha1",    );    assert_eq!(      verify_tarball_integrity(package, &Vec::new(), "sha512-test")        .unwrap_err()        .to_string(),      format!("Tarball checksum did not match what was provided by npm registry for package@1.0.0.\n\nExpected: test\nActual: {}", actual_checksum),    );    assert!(verify_tarball_integrity(      package,      &Vec::new(),      &format!("sha512-{}", actual_checksum)    )    .is_ok());  }}