293 lines
10 KiB
Rust
293 lines
10 KiB
Rust
use std::process::Command;
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use std::fs::File;
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use std::io::{self, BufReader, Read, Write};
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use std::path::{Path, PathBuf};
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use std::time::{Duration, Instant};
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use json::{self, JsonValue};
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use reqwest::{Response, StatusCode};
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use reqwest::header::Charset;
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use reqwest::header::{ContentDisposition, ContentType, DispositionParam, DispositionType};
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use zip::ZipArchive;
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use {construct_cookie, read_response_body, try_to_get_response, try_to_get_valid_response};
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use DownloadError;
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#[derive(Debug)]
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pub enum Presentation {
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PublishToGo {
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name: String,
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download_url: String,
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},
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VideoOnDemand {
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name: String,
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resource_id: String,
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query_string: String,
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},
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}
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impl Presentation {
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pub(crate) fn name(&self) -> &str {
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match *self {
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Presentation::PublishToGo { ref name, .. }
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| Presentation::VideoOnDemand { ref name, .. } => name,
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}
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}
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pub(crate) fn download(&self, out_dir: &Path) -> Result<(), DownloadError> {
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fn download_to_file_and_check<F: Fn(&Path) -> bool>(
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response: &mut Response,
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out_file: &Path,
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check: F,
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) -> Result<(), io::Error> {
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println!("Output file: {}", out_file.display());
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if out_file.exists() {
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println!("File is present already. Checking validity...");
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if check(out_file) {
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println!("Valid file! Skipping!");
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return Ok(());
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} else {
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println!("Corrupt file! Starting anew!");
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}
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// TODO?: We could try resuming the download if the server supports it
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// http://stackoverflow.com/questions/41444297/
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// http://stackoverflow.com/questions/3428102/
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}
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download_to_file(response, out_file)?;
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assert!(check(out_file));
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Ok(())
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}
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match *self {
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Presentation::PublishToGo {
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ref download_url, ..
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} => {
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let response_res = try_to_get_valid_response(
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|client| {
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let mut request_builder = client.get(download_url);
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request_builder.header(construct_cookie());
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request_builder
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},
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|resp| resp.headers().get::<ContentDisposition>().is_some(),
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);
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if response_res.is_err() {
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// Appears to be the reason...
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return Err(DownloadError::AuthorizationTimeout);
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}
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let mut response = response_res.unwrap();
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let filename = {
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let content_disposition =
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response.headers().get::<ContentDisposition>().unwrap();
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assert_eq!(content_disposition.disposition, DispositionType::Attachment);
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let mut name = None;
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for param in &content_disposition.parameters {
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match *param {
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DispositionParam::Filename(ref charset, _, ref vec) => {
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assert_eq!(&Charset::Ext("UTF-8".to_string()), charset);
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name = Some(
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String::from_utf8(vec.to_vec())
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.expect("Suggested filename isn't valid UTF-8!"),
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);
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}
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_ => continue,
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}
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}
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name.expect("Missing filename in ContentDisposition!")
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};
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let mut path = PathBuf::from(out_dir);
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path.push(fix_filename(&filename));
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download_to_file_and_check(&mut response, &path, |path| check_zip(path))
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.map_err(DownloadError::IoError)
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}
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Presentation::VideoOnDemand {
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ref resource_id,
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ref query_string,
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..
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} => {
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let videos = {
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let payload = format!(
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"{{\"getPlayerOptionsRequest\":{{\
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\"ResourceId\":\"{}\",\
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\"QueryString\":\"{}\"\
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}}}}",
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resource_id, query_string
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);
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let url = "https://streams.tum.de/Mediasite/PlayerService/\
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PlayerService.svc/json/GetPlayerOptions";
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let mut res = try_to_get_response(|client| {
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let mut request_builder = client.post(url);
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request_builder
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.header(construct_cookie())
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.header(ContentType::json())
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.body(payload.to_string());
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request_builder
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});
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let json_text = read_response_body(&mut res);
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if json_text.contains("You are not authorized to view the requested content") {
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return Err(DownloadError::AuthorizationTimeout);
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}
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let json = json::parse(&json_text).expect("Failed parsing the json!");
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let mut vec = Vec::new();
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for stream in json["d"]["Presentation"]["Streams"].members() {
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assert_eq!(stream["VideoUrls"].len(), 1);
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vec.push(stream["VideoUrls"][0]["Location"].to_string());
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}
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vec
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};
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for (i, download_url) in videos.iter().enumerate() {
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let mut response = try_to_get_valid_response(
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|client| {
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let mut request_builder = client.get(download_url);
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request_builder.header(construct_cookie());
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request_builder
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},
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|resp| resp.status() == StatusCode::Ok,
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).unwrap();
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// TODO: Support formats besides mp4
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// extract extension from url or somewehre else...
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let filename = format!("{} - {}.mp4", fix_filename(self.name()), i + 1);
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let mut path = PathBuf::from(out_dir);
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path.push(fix_filename(&filename));
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let mut path = PathBuf::from(out_dir);
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path.push(fix_filename(&filename));
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download_to_file_and_check(&mut response, &path, |path| check_video(path))
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.map_err(DownloadError::IoError)?;
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}
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Ok(())
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}
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}
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}
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}
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impl<'a> From<&'a JsonValue> for Presentation {
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fn from(json: &'a JsonValue) -> Presentation {
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if json["DownloadUrls"].len() >= 1 {
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assert_eq!(json["DownloadUrls"].len(), 1);
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Presentation::PublishToGo {
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name: json["Name"]
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.clone()
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.take_string()
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.expect("json: Presentation didn't contain a \"Name\"!"),
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download_url: json["DownloadUrls"][0]["Url"]
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.clone()
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.take_string()
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.expect("json: Presentation didn't have a download url!"),
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}
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} else {
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// No "Publish To Go" -> download video streams manually
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let player_url = json["PlayerUrl"].to_string();
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let index = player_url.find("?catalog=").unwrap();
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let index_end_query = index + "?catalog=499c5d25-37a6-4853-95d5-bfbf7f76fcf2".len();
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let index_start_resource = index - "cdf23465581b45aa92d588ebd59619d91d".len();
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Presentation::VideoOnDemand {
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name: json["Name"]
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.clone()
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.take_string()
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.expect("json: Presentation didn't contain a \"Name\"!"),
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query_string: player_url[index..index_end_query].to_string(),
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resource_id: player_url[index_start_resource..index].to_string(),
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}
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}
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}
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}
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fn download_to_file(response: &mut Response, path: &Path) -> Result<(), io::Error> {
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let mut file = File::create(&path).expect("Failed to create file!");
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let mut reader = BufReader::new(response);
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let mut buf = [0u8; 8 * 1024];
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let update_duration_millis = 1000;
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let mut last = Instant::now();
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let mut done = 0;
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loop {
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let len = match reader.read(&mut buf) {
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Ok(0) => break,
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Ok(len) => len,
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Err(ref e) if e.kind() == io::ErrorKind::Interrupted => continue,
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Err(e) => return Err(e),
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};
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file.write_all(&buf[0..len])
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.expect("Failed writing into the file!");
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done += len;
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let now = Instant::now();
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if now - last > Duration::from_millis(update_duration_millis) {
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print!(
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"{:.*} kB/s \r",
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2,
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done as f64 * 1000.0 / update_duration_millis as f64 / 1024.0
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);
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::std::io::stdout()
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.flush()
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.expect("Failed flushing the terminal!");
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last = now;
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done = 0;
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}
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}
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println!("Download successful!");
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Ok(())
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}
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fn fix_filename(string: &str) -> String {
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string
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.replace('/', "_")
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.replace('\\', "_")
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.replace(':', " -")
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.replace('*', "%2A")
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.replace('?', "%3F")
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.replace('"', "'")
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.replace('<', "'")
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.replace('>', "'")
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.replace('|', "_")
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}
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fn check_zip(path: &Path) -> bool {
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assert!(path.exists());
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assert!(path.is_file());
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let file = File::open(path).expect("Failed opening the zip file!");
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ZipArchive::new(file).is_ok()
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}
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fn check_video(path: &Path) -> bool {
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let command = Command::new("ffmpeg")
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.arg("-v")
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.arg("error")
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.arg("-i")
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.arg(path)
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.arg("-f")
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.arg("null")
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.arg("-")
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.output();
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match command {
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Ok(output) => output.stderr.is_empty(),
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Err(_) => {
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println!(
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"Failed to check {} with ffmpeg. Perhaps ffmpeg isn't in your path. \
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Skipping check...",
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path.display()
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);
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true
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}
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}
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}
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