116 lines
3.7 KiB
Rust
116 lines
3.7 KiB
Rust
use std::str::FromStr;
|
|
|
|
use anyhow::Context;
|
|
|
|
use crate::hash_id::{Id20, Id32};
|
|
|
|
/// A parsed magnet link.
|
|
pub struct Magnet {
|
|
id20: Option<Id20>,
|
|
id32: Option<Id32>,
|
|
pub trackers: Vec<String>,
|
|
}
|
|
|
|
impl Magnet {
|
|
pub fn as_id20(&self) -> Option<Id20> {
|
|
self.id20
|
|
}
|
|
|
|
pub fn as_id32(&self) -> Option<Id32> {
|
|
self.id32
|
|
}
|
|
|
|
/// Parse a magnet link.
|
|
pub fn parse(url: &str) -> anyhow::Result<Magnet> {
|
|
let url = url::Url::parse(url).context("magnet link must be a valid URL")?;
|
|
if url.scheme() != "magnet" {
|
|
anyhow::bail!("expected scheme magnet");
|
|
}
|
|
let mut info_hash_found = false;
|
|
let mut id20: Option<Id20> = None;
|
|
let mut id32: Option<Id32> = None;
|
|
let mut trackers = Vec::<String>::new();
|
|
for (key, value) in url.query_pairs() {
|
|
match key.as_ref() {
|
|
"xt" => {
|
|
if let Some(ih) = value.as_ref().strip_prefix("urn:btih:") {
|
|
let i = Id20::from_str(ih)?;
|
|
id20.replace(i);
|
|
info_hash_found = true;
|
|
} else if let Some(ih) = value.as_ref().strip_prefix("urn:btmh:1220") {
|
|
let i = Id32::from_str(ih)?;
|
|
id32.replace(i);
|
|
info_hash_found = true;
|
|
} else {
|
|
anyhow::bail!("expected xt to start with btih or btmh");
|
|
}
|
|
}
|
|
"tr" => trackers.push(value.into()),
|
|
_ => {}
|
|
}
|
|
}
|
|
match info_hash_found {
|
|
true => Ok(Magnet {
|
|
id20,
|
|
id32,
|
|
trackers,
|
|
}),
|
|
false => {
|
|
anyhow::bail!("did not find infohash")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Display for Magnet {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
|
if let (Some(id20), Some(id32)) = (self.id20, self.id32) {
|
|
write!(
|
|
f,
|
|
"magnet:?xt=urn:btih:{}?xt=urn:btmh:1220{}&tr={}",
|
|
id20.as_string(),
|
|
id32.as_string(),
|
|
self.trackers.join("&tr=")
|
|
)
|
|
} else if let Some(id20) = self.id20 {
|
|
write!(
|
|
f,
|
|
"magnet:?xt=urn:btih:{}&tr={}",
|
|
id20.as_string(),
|
|
self.trackers.join("&tr=")
|
|
)
|
|
} else if let Some(id32) = self.id32 {
|
|
write!(
|
|
f,
|
|
"magnet:?xt=urn:btmh:1220{}&tr={}",
|
|
id32.as_string(),
|
|
self.trackers.join("&tr=")
|
|
)
|
|
} else {
|
|
panic!("no infohash")
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
#[test]
|
|
fn test_parse_magnet_as_url() {
|
|
let magnet = "magnet:?xt=urn:btih:a621779b5e3d486e127c3efbca9b6f8d135f52e5&dn=rutor.info_%D0%92%D0%BE%D0%B9%D0%BD%D0%B0+%D0%B1%D1%83%D0%B4%D1%83%D1%89%D0%B5%D0%B3%D0%BE+%2F+The+Tomorrow+War+%282021%29+WEB-DLRip+%D0%BE%D1%82+MegaPeer+%7C+P+%7C+NewComers&tr=udp://opentor.org:2710&tr=udp://opentor.org:2710&tr=http://retracker.local/announce";
|
|
dbg!(url::Url::parse(magnet).unwrap());
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_magnet_v2() {
|
|
use super::Magnet;
|
|
use crate::magnet::Id32;
|
|
use std::str::FromStr;
|
|
let magnet = "magnet:?xt=urn:btmh:1220caf1e1c30e81cb361b9ee167c4aa64228a7fa4fa9f6105232b28ad099f3a302e&dn=bittorrent-v2-test
|
|
";
|
|
let info_hash =
|
|
Id32::from_str("caf1e1c30e81cb361b9ee167c4aa64228a7fa4fa9f6105232b28ad099f3a302e")
|
|
.unwrap();
|
|
let m = Magnet::parse(magnet).unwrap();
|
|
assert!(m.as_id32() == Some(info_hash));
|
|
}
|
|
}
|