fn download_to_temp_archive(
    url: &str,
    expected_sha256: Option<&str>,
) -> Result<(TempDir, PathBuf, String), Box<dyn std::error::Error>> {
    fn sha256_digest<R: Read>(mut reader: R) -> Result<Digest, Box<dyn std::error::Error>> {
        let mut context = Context::new(&SHA256);
        let mut buffer = [0; 1024];

        loop {
            let count = reader.read(&mut buffer)?;
            if count == 0 {
                break;
            }
            context.update(&buffer[..count]);
        }

        Ok(context.finish())
    }

    fn sha256_file_digest<P: AsRef<Path>>(path: P) -> Result<Digest, Box<dyn std::error::Error>> {
        let input = File::open(path)?;
        let reader = BufReader::new(input);
        sha256_digest(reader)
    }

    let url = Url::parse(url).map_err(|err| format!("Unable to parse {}: {}", url, err))?;

    let temp_dir = TempDir::new(clap::crate_name!())?;
    let temp_file = temp_dir.path().join("release.tar.bz2");

    let client = reqwest::Client::new();

    let progress_bar = new_spinner_progress_bar();
    progress_bar.set_message(&format!("{}Downloading...", TRUCK));

    let response = client.get(url).send()?;
    let download_size = {
        response
            .headers()
            .get(reqwest::header::CONTENT_LENGTH)
            .and_then(|content_length| content_length.to_str().ok())
            .and_then(|content_length| content_length.parse().ok())
            .unwrap_or(0)
    };

    progress_bar.set_length(download_size);
    progress_bar.set_style(
        ProgressStyle::default_bar()
            .template(&format!(
                "{}{}{}",
                "{spinner:.green} ",
                TRUCK,
                "Downloading [{bar:40.cyan/blue}] {bytes}/{total_bytes} ({eta})"
            ))
            .progress_chars("=> "),
    );

    struct DownloadProgress<R> {
        progress_bar: ProgressBar,
        response: R,
    }

    impl<R: Read> Read for DownloadProgress<R> {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
            self.response.read(buf).map(|n| {
                self.progress_bar.inc(n as u64);
                n
            })
        }
    }

    let mut source = DownloadProgress {
        progress_bar,
        response,
    };

    let mut file = File::create(&temp_file)?;
    std::io::copy(&mut source, &mut file)?;

    let temp_file_sha256 = sha256_file_digest(&temp_file)
        .map_err(|err| format!("Unable to hash {:?}: {}", temp_file, err))?;
    let temp_file_sha256 = bs58::encode(temp_file_sha256).into_string();

    if expected_sha256.is_some() && expected_sha256 != Some(&temp_file_sha256) {
        Err(io::Error::new(io::ErrorKind::Other, "Incorrect hash"))?;
    }
    Ok((temp_dir, temp_file, temp_file_sha256))
}
/// Downloads the release archive at `url` to a temporary location.  If `expected_sha256` is
/// Some(_), produce an error if the release SHA256 doesn't match.
///
/// Returns a tuple consisting of:
/// * TempDir - drop this value to clean up the temporary location
/// * PathBuf - path to the downloaded release (within `TempDir`)
/// * String  - SHA256 of the release
///
Downloads the release archive at `url` to a temporary location.  If `expected_sha256` is
Some(_), produce an error if the release SHA256 doesn't match.

Returns a tuple consisting of:
TempDir - drop this value to clean up the temporary location
PathBuf - path to the downloaded release (within `TempDir`)
String  - SHA256 of the release
Downloads the release archive at ` url ` to a temporary location . If ` expected_sha256 ` is Some ( _ ) produce an error if the release SHA256 doesn ' t match . Returns a tuple consisting of : TempDir - drop this value to clean up the temporary location PathBuf - path to the downloaded release ( within ` TempDir ` ) String - SHA256 of the release
fn download_to_temp_archive(
    url: &str,
    expected_sha256: Option<&str>,
) -> Result<(TempDir, PathBuf, String), Box<dyn std::error::Error>> {
    fn sha256_digest<R: Read>(mut reader: R) -> Result<Digest, Box<dyn std::error::Error>> {
        let mut context = Context::new(&SHA256);
        let mut buffer = [0; 1024];
        loop {
            let count = reader.read(&mut buffer)?;
            if count == 0 {
                break;
            }
            context.update(&buffer[..count]);
        }
        Ok(context.finish())
    }
    fn sha256_file_digest<P: AsRef<Path>>(path: P) -> Result<Digest, Box<dyn std::error::Error>> {
        let input = File::open(path)?;
        let reader = BufReader::new(input);
        sha256_digest(reader)
    }
    let url = Url::parse(url).map_err(|err| format!("Unable to parse {}: {}", url, err))?;
    let temp_dir = TempDir::new(clap::crate_name!())?;
    let temp_file = temp_dir.path().join("release.tar.bz2");
    let client = reqwest::Client::new();
    let progress_bar = new_spinner_progress_bar();
    progress_bar.set_message(&format!("{}Downloading...", TRUCK));
    let response = client.get(url).send()?;
    let download_size = {
        response
            .headers()
            .get(reqwest::header::CONTENT_LENGTH)
            .and_then(|content_length| content_length.to_str().ok())
            .and_then(|content_length| content_length.parse().ok())
            .unwrap_or(0)
    };
    progress_bar.set_length(download_size);
    progress_bar.set_style(
        ProgressStyle::default_bar()
            .template(&format!(
                "{}{}{}",
                "{spinner:.green} ",
                TRUCK,
                "Downloading [{bar:40.cyan/blue}] {bytes}/{total_bytes} ({eta})"
            ))
            .progress_chars("=> "),
    );
    struct DownloadProgress<R> {
        progress_bar: ProgressBar,
        response: R,
    }
    impl<R: Read> Read for DownloadProgress<R> {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
            self.response.read(buf).map(|n| {
                self.progress_bar.inc(n as u64);
                n
            })
        }
    }
    let mut source = DownloadProgress {
        progress_bar,
        response,
    };
    let mut file = File::create(&temp_file)?;
    std::io::copy(&mut source, &mut file)?;
    let temp_file_sha256 = sha256_file_digest(&temp_file)
        .map_err(|err| format!("Unable to hash {:?}: {}", temp_file, err))?;
    let temp_file_sha256 = bs58::encode(temp_file_sha256).into_string();
    if expected_sha256.is_some() && expected_sha256 != Some(&temp_file_sha256) {
        Err(io::Error::new(io::ErrorKind::Other, "Incorrect hash"))?;
    }
    Ok((temp_dir, temp_file, temp_file_sha256))
}
fn download_to_temp_archive ( url : & str , expected_sha256 : Option < & str > , ) -> Result < ( TempDir , PathBuf , String ) , Box < dyn std :: error :: Error > > { fn sha256_digest < R : Read > ( mut reader : R ) -> Result < Digest , Box < dyn std :: error :: Error > > { let mut context = Context :: new ( & SHA256 ) ; let mut buffer = [ 0 ; 1024 ] ; loop { let count = reader . read ( & mut buffer ) ? ; if count == 0 { break ; } context . update ( & buffer [ .. count ] ) ; } Ok ( context . finish ( ) ) } fn sha256_file_digest < P : AsRef < Path > > ( path : P ) -> Result < Digest , Box < dyn std :: error :: Error > > { let input = File :: open ( path ) ? ; let reader = BufReader :: new ( input ) ; sha256_digest ( reader ) } let url = Url :: parse ( url ) . map_err ( | err | format ! ( " " url err ) ) ? ; let temp_dir = TempDir :: new ( clap :: crate_name ! ( ) ) ? ; let temp_file = temp_dir . path ( ) . join ( " " ) ; let client = reqwest :: Client :: new ( ) ; let progress_bar = new_spinner_progress_bar ( ) ; progress_bar . set_message ( & format ! ( " " TRUCK ) ) ; let response = client . get ( url ) . send ( ) ? ; let download_size = { response . headers ( ) . get ( reqwest :: header :: CONTENT_LENGTH ) . and_then ( | content_length | content_length . to_str ( ) . ok ( ) ) . and_then ( | content_length | content_length . parse ( ) . ok ( ) ) . unwrap_or ( 0 ) } ; progress_bar . set_length ( download_size ) ; progress_bar . set_style ( ProgressStyle :: default_bar ( ) . template ( & format ! ( " " " " TRUCK " " ) ) . progress_chars ( " " ) , ) ; struct DownloadProgress < R > { progress_bar : ProgressBar , response : R , } impl < R : Read > Read for DownloadProgress < R > { fn read ( & mut self , buf : & mut [ u8 ] ) -> io :: Result < usize > { self . response . read ( buf ) . map ( | n | { self . progress_bar . inc ( n as u64 ) ; n } ) } } let mut source = DownloadProgress { progress_bar , response , } ; let mut file = File :: create ( & temp_file ) ? ; std :: io :: copy ( & mut source , & mut file ) ? ; let temp_file_sha256 = sha256_file_digest ( & temp_file ) . map_err ( | err | format ! ( " " temp_file err ) ) ? ; let temp_file_sha256 = bs58 :: encode ( temp_file_sha256 ) . into_string ( ) ; if expected_sha256 . is_some ( ) && expected_sha256 != Some ( & temp_file_sha256 ) { Err ( io :: Error :: new ( io :: ErrorKind :: Other , " " ) ) ? ; } Ok ( ( temp_dir , temp_file , temp_file_sha256 ) ) }
Downloads the release archive at `url` to a temporary location.
Downloads the release archive at ` url ` to a temporary location .
url
&str
expected_sha256
Option<&str>
url
&str
expected_sha256
Option<&str>