Hanlde jacket torrent url

Cargo.lock

@@ -2593,6 +2593,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a978451301f4db1d02937a4ab3ccce137717b81826e79b7d49ffe3244a13c3b8"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.2.17",
+ "digest 0.10.7",
+]
+
 [[package]]
 name = "sha1"
 version = "0.11.0"
@@ -2818,7 +2829,7 @@ dependencies = [
  "log",
  "percent-encoding",
  "serde",
- "sha1",
+ "sha1 0.11.0",
  "sha2 0.11.0",
  "sqlx-core",
  "thiserror 2.0.18",
@@ -3217,9 +3228,12 @@ name = "torad"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "async-trait",
  "clap",
  "librqbit",
  "librqbit-core",
+ "reqwest",
+ "sha1 0.10.7",
  "sqlx",
  "tokio",
  "tokio-stream",

crates/torad/Cargo.toml

@@ -5,9 +5,12 @@ edition = "2024"
 
 [dependencies]
 anyhow = "1.0.103"
+async-trait = "0.1"
 clap = { version = "4.6.1", features = ["derive", "env"] }
 librqbit = { version = "8.1.1", default-features = false, features = ["rust-tls", "http-api-client"] }
 librqbit-core = { version = "5.0.0", default-features = false }
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls"] }
+sha1 = "0.10"
 sqlx = { version = "0.9.0", features = ["postgres", "runtime-tokio", "tls-rustls", "uuid"] }
 tokio = { version = "1.52.3", features = ["rt-multi-thread", "macros", "net", "signal"] }
 tokio-stream = { version = "0.1.18", features = ["net"] }

crates/torad/src/magnet.rs

@@ -1,17 +0,0 @@
-use anyhow::{Context, Result};
-use librqbit::Magnet;
-
-pub fn info_hash(source: &str) -> Result<String> {
-    if source.starts_with("magnet:") {
-        let parsed = Magnet::parse(source).context("failed to parse magnet link")?;
-        let id20 = parsed
-            .as_id20()
-            .context("magnet link has no v1 (BTIH) info hash")?;
-        return Ok(id20.as_string());
-    }
-    let bytes =
-        std::fs::read(source).with_context(|| format!("failed to read torrent file: {source}"))?;
-    let parsed = librqbit::torrent_from_bytes_ext::<Vec<u8>>(&bytes)
-        .context("failed to parse .torrent file")?;
-    Ok(parsed.meta.info_hash.as_string())
-}

crates/torad/src/main.rs

@@ -1,5 +1,5 @@
 mod db;
-mod magnet;
+mod source;
 mod torrents;
 
 use std::path::PathBuf;

crates/torad/src/source/file.rs

@@ -0,0 +1,32 @@
+//! Handler for local filesystem paths. Reads the file and delegates to the
+//! shared tolerant [`super::info_hash`] extractor. Used when clients pass a
+//! path to a `.torrent` file on disk rather than a URL.
+
+use anyhow::{Context, Result};
+use async_trait::async_trait;
+
+use super::info_hash;
+use super::{Resolved, SourceHandler};
+
+pub(crate) struct FileHandler;
+
+#[async_trait]
+impl SourceHandler for FileHandler {
+    fn matches(&self, source: &str) -> bool {
+        !source.starts_with("magnet:")
+            && !source.starts_with("http://")
+            && !source.starts_with("https://")
+    }
+
+    async fn resolve(&self, source: &str) -> Result<Resolved> {
+        let bytes = tokio::fs::read(source)
+            .await
+            .with_context(|| format!("failed to read torrent file: {source}"))?;
+        let info_hash =
+            info_hash::from_bytes(&bytes).context("failed to extract info_hash from file")?;
+        Ok(Resolved {
+            info_hash,
+            rewritten_source: None,
+        })
+    }
+}

crates/torad/src/source/http_fetch.rs

@@ -0,0 +1,120 @@
+//! Shared HTTP-fetch helper used by handlers that need to download `.torrent`
+//! bytes or follow `Location` redirects manually.
+//!
+//! reqwest's default policy follows 3xx only for `http`/`https`. Jackett (and
+//! some indexers) 302-redirect to `magnet:` URIs — those would error out under
+//! reqwest's default policy. We disable auto-following entirely and inspect
+//! `Location` ourselves so the caller can route to the magnet handler.
+
+use anyhow::{Context, Result, bail};
+use reqwest::StatusCode;
+use reqwest::header::LOCATION;
+use tracing::{debug, warn};
+
+/// Maximum number of HTTP redirect hops before giving up.
+const MAX_REDIRECTS: u8 = 5;
+
+/// Truncation limit for error-response bodies logged for diagnostics.
+const ERROR_BODY_LOG_LIMIT: usize = 500;
+
+pub(super) enum HttpFetchOutcome {
+    /// Server returned 2xx with a body — assumed to be bencoded `.torrent` bytes.
+    Bytes(Vec<u8>),
+    /// Server returned a 3xx whose `Location` is a `magnet:` URI.
+    Magnet(String),
+}
+
+pub(super) async fn fetch(client: &reqwest::Client, source: &str) -> Result<HttpFetchOutcome> {
+    let mut current = source.to_string();
+    for hop in 0..MAX_REDIRECTS {
+        let resp = client
+            .get(&current)
+            .send()
+            .await
+            .with_context(|| format!("HTTP GET failed for {current}"))?;
+        let status = resp.status();
+        debug!(url = %current, status = %status, hop, "HTTP response");
+
+        if status.is_redirection() {
+            let loc = resp
+                .headers()
+                .get(LOCATION)
+                .and_then(|v| v.to_str().ok())
+                .unwrap_or("");
+            if loc.is_empty() {
+                bail!("redirect with empty Location header from {current}");
+            }
+            if loc.starts_with("magnet:") {
+                debug!(magnet = %loc, "redirected to magnet");
+                return Ok(HttpFetchOutcome::Magnet(loc.to_string()));
+            }
+            if loc.starts_with("http://") || loc.starts_with("https://") {
+                current = loc.to_string();
+                continue;
+            }
+            bail!("unsupported redirect target from {current}: {loc}");
+        }
+
+        if !status.is_success() {
+            // Read the body so error responses are useful in logs.
+            let body = resp.text().await.unwrap_or_default();
+            let preview: String = body.chars().take(ERROR_BODY_LOG_LIMIT).collect();
+            warn!(url = %current, status = %status, body = %preview, "non-success HTTP status");
+            bail!(
+                "HTTP {status} from {current}: {preview}",
+                status = status,
+                current = current,
+                preview = preview,
+            );
+        }
+
+        let content_type = resp
+            .headers()
+            .get(reqwest::header::CONTENT_TYPE)
+            .and_then(|v| v.to_str().ok())
+            .unwrap_or("")
+            .to_string();
+        let bytes = resp
+            .bytes()
+            .await
+            .with_context(|| format!("failed reading response body from {current}"))?
+            .to_vec();
+        debug!(url = %current, content_type = %content_type, bytes = bytes.len(), "received body");
+        // Detect obvious non-torrent responses so callers get a clear error
+        // instead of an opaque bencode-parse failure downstream.
+        if looks_like_html(&bytes) {
+            bail!(
+                "received HTML from {current} (likely a Jackett error page); first 200 bytes: {}",
+                String::from_utf8_lossy(&bytes[..bytes.len().min(200)])
+            );
+        }
+        if status == StatusCode::OK && bytes.is_empty() {
+            bail!("empty response body from {current}");
+        }
+        return Ok(HttpFetchOutcome::Bytes(bytes));
+    }
+    bail!("exceeded {MAX_REDIRECTS} redirects while resolving {source}");
+}
+
+/// Cheap heuristic: true if the first non-whitespace bytes look like an HTML
+/// document (`<!doctype`, `<html`, or any `<` tag opener). Jackett returns
+/// HTML error pages with HTTP 200 on auth/path failures, so catching this
+/// here yields a clearer error than letting bencode parsing fail.
+fn looks_like_html(bytes: &[u8]) -> bool {
+    let prefix: &[u8] = &bytes[..bytes.len().min(200)];
+    let trimmed = prefix
+        .iter()
+        .copied()
+        .skip_while(|b| b.is_ascii_whitespace())
+        .collect::<Vec<_>>();
+    let lower = trimmed
+        .iter()
+        .take_while(|b| b.is_ascii())
+        .map(|b| b.to_ascii_lowercase())
+        .collect::<Vec<_>>();
+    lower.starts_with(b"<!doctype")
+        || lower.starts_with(b"<html")
+        || lower.starts_with(b"<head")
+        || lower.starts_with(b"<body")
+        || lower.starts_with(b"<!--")
+}

crates/torad/src/source/http_torrent.rs

@@ -0,0 +1,53 @@
+//! Handler for generic HTTP(S) `.torrent` URLs that are not Jackett proxy
+//! links (covered by [`super::jackett::JackettHandler`]). Same redirect +
+//! tolerant-parse logic, just a broader match.
+
+use anyhow::{Context, Result};
+use async_trait::async_trait;
+use librqbit::Magnet;
+
+use super::http_fetch::{self, HttpFetchOutcome};
+use super::info_hash;
+use super::{Resolved, SourceHandler};
+
+pub(crate) struct HttpTorrentHandler {
+    client: reqwest::Client,
+}
+
+impl HttpTorrentHandler {
+    pub(crate) fn new(client: reqwest::Client) -> Self {
+        Self { client }
+    }
+}
+
+#[async_trait]
+impl SourceHandler for HttpTorrentHandler {
+    fn matches(&self, source: &str) -> bool {
+        source.starts_with("http://") || source.starts_with("https://")
+    }
+
+    async fn resolve(&self, source: &str) -> Result<Resolved> {
+        let outcome = http_fetch::fetch(&self.client, source).await?;
+        match outcome {
+            HttpFetchOutcome::Magnet(magnet) => {
+                let parsed = Magnet::parse(&magnet)
+                    .with_context(|| format!("failed to parse redirected magnet: {magnet}"))?;
+                let id20 = parsed
+                    .as_id20()
+                    .context("redirected magnet has no v1 (BTIH) info hash")?;
+                Ok(Resolved {
+                    info_hash: id20.as_string(),
+                    rewritten_source: Some(magnet),
+                })
+            }
+            HttpFetchOutcome::Bytes(bytes) => {
+                let info_hash = info_hash::from_bytes(&bytes)
+                    .context("failed to extract info_hash from .torrent body")?;
+                Ok(Resolved {
+                    info_hash,
+                    rewritten_source: None,
+                })
+            }
+        }
+    }
+}

crates/torad/src/source/info_hash.rs

@@ -0,0 +1,214 @@
+//! Tolerant extraction of the BTIH v1 info-hash from bencoded `.torrent`
+//! bytes.
+//!
+//! Strategy: try librqbit's strict parser first (correct, well-tested). If it
+//! rejects the bytes — which happens in practice because some indexers
+//! (rutracker, filelist) emit non-spec bencode with duplicate dict keys (see
+//! <https://github.com/Jackett/Jackett/issues/16492>) — fall back to a
+//! byte-span SHA1 of the `info` value, which doesn't care about dict-key
+//! validity at all.
+//!
+//! The info-hash *is* by definition the SHA1 of the bencoded `info` value's
+//! byte range, so walking the value's byte boundaries (rather than fully
+//! parsing it) yields the correct hash even for spec-violating files.
+
+use anyhow::{Context, Result};
+use librqbit::torrent_from_bytes_ext;
+use sha1::{Digest, Sha1};
+
+/// Extracts the v1 info-hash from `.torrent` bytes.
+pub(super) fn from_bytes(bytes: &[u8]) -> Result<String> {
+    // Fast path: spec-compliant torrent, librqbit's parser handles it.
+    if let Ok(parsed) = torrent_from_bytes_ext::<Vec<u8>>(bytes) {
+        return Ok(parsed.meta.info_hash.as_string());
+    }
+    // Fallback: locate the `info` value's byte span and SHA1 it directly.
+    let span = locate_info_value(bytes)
+        .context("could not locate `info` value in .torrent bytes; not a valid torrent file")?;
+    let mut hasher = Sha1::new();
+    hasher.update(&bytes[span]);
+    let digest = hasher.finalize();
+    Ok(hex_encode(&digest))
+}
+
+/// Locates the byte range `[start, end)` of the bencoded value associated
+/// with the top-level dict key `info`. Returns `None` if the bytes aren't a
+/// `.torrent`-shaped dict containing that key.
+///
+/// Walks the top-level dict properly (key → value → key → value…) instead of
+/// substring-scanning for `4:info`, so an `info` substring appearing inside
+/// some other value's payload (e.g. a filename) can't trigger a false match.
+fn locate_info_value(bytes: &[u8]) -> Option<std::ops::Range<usize>> {
+    let mut i = 0;
+    // Top-level value must be a dict.
+    if *bytes.get(i)? != b'd' {
+        return None;
+    }
+    i += 1;
+    while i < bytes.len() {
+        let b = bytes[i];
+        if b == b'e' {
+            // Dict ended without finding `info`.
+            return None;
+        }
+        // Dict keys are always byte strings.
+        if !b.is_ascii_digit() {
+            return None;
+        }
+        let (key_len, colon_at) = read_string_header(bytes, i)?;
+        let key_start = colon_at + 1;
+        let key_end = key_start.checked_add(key_len)?;
+        if key_end > bytes.len() {
+            return None;
+        }
+        let key = &bytes[key_start..key_end];
+        i = key_end;
+        if key == b"info" {
+            let value_end = walk_value(bytes, i)?;
+            return Some(i..value_end);
+        }
+        // Skip past this value to reach the next key.
+        i = walk_value(bytes, i)?;
+    }
+    None
+}
+
+/// Walks one bencoded value starting at `start` and returns the index just
+/// past its last byte. Handles dicts (`d...e`), lists (`l...e`), integers
+/// (`i...e`), and byte strings (`<len>:<bytes>`). Returns `None` on
+/// malformed input or unexpected end-of-buffer.
+fn walk_value(bytes: &[u8], start: usize) -> Option<usize> {
+    let mut i = start;
+    let first = *bytes.get(i)?;
+    match first {
+        b'd' | b'l' => {
+            // Container: track depth, walk until matching `e`.
+            i += 1;
+            let mut depth: u32 = 1;
+            while depth > 0 {
+                let b = *bytes.get(i)?;
+                match b {
+                    b'd' | b'l' => {
+                        depth += 1;
+                        i += 1;
+                    }
+                    b'e' => {
+                        depth -= 1;
+                        i += 1;
+                    }
+                    b'0'..=b'9' => {
+                        // Byte string: read length prefix up to `:`, then skip
+                        // the length-prefixed payload.
+                        let (end, colon_at) = read_string_header(bytes, i)?;
+                        i = colon_at + 1;
+                        let payload_end = i.checked_add(end)?;
+                        if payload_end > bytes.len() {
+                            return None;
+                        }
+                        i = payload_end;
+                    }
+                    b'i' => {
+                        // Integer: skip to next `e`.
+                        i += 1;
+                        while i < bytes.len() && bytes[i] != b'e' {
+                            i += 1;
+                        }
+                        if i >= bytes.len() {
+                            return None;
+                        }
+                        i += 1; // consume `e`
+                    }
+                    _ => return None,
+                }
+                if i > bytes.len() + 1 {
+                    return None;
+                }
+            }
+            Some(i)
+        }
+        b'i' => {
+            i += 1;
+            while i < bytes.len() && bytes[i] != b'e' {
+                i += 1;
+            }
+            if i >= bytes.len() {
+                return None;
+            }
+            Some(i + 1)
+        }
+        b'0'..=b'9' => {
+            let (len, colon_at) = read_string_header(bytes, i)?;
+            let payload_end = colon_at + 1 + len;
+            if payload_end > bytes.len() {
+                return None;
+            }
+            Some(payload_end)
+        }
+        _ => None,
+    }
+}
+
+/// Parses a bencode string-length prefix `<digits>:` at position `i`.
+/// Returns `(length, index_of_colon)`.
+fn read_string_header(bytes: &[u8], i: usize) -> Option<(usize, usize)> {
+    let mut j = i;
+    while j < bytes.len() && bytes[j].is_ascii_digit() {
+        j += 1;
+    }
+    if j >= bytes.len() || bytes[j] != b':' {
+        return None;
+    }
+    let len: usize = std::str::from_utf8(&bytes[i..j]).ok()?.parse().ok()?;
+    // Sanity-cap to avoid overflow / huge allocations on garbage input.
+    if len > bytes.len() {
+        return None;
+    }
+    Some((len, j))
+}
+
+fn hex_encode(bytes: &[u8]) -> String {
+    const HEX: &[u8; 16] = b"0123456789abcdef";
+    let mut out = String::with_capacity(bytes.len() * 2);
+    for b in bytes {
+        out.push(HEX[(b >> 4) as usize] as char);
+        out.push(HEX[(b & 0x0f) as usize] as char);
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Synthetic minimal torrent: `d4:infod6:lengthi1e4:name1:aee`.
+    /// info_hash is SHA1 of the bytes between `4:info` and the matching outer
+    /// `e`, i.e. SHA1("d6:lengthi1e4:name1:ae").
+    #[test]
+    fn extracts_hash_from_minimal_torrent() {
+        let torrent = b"d4:infod6:lengthi1e4:name1:aee";
+        let resolved = from_bytes(torrent).expect("must extract info_hash");
+        // Manually compute expected hash for the same info span.
+        let info_span = locate_info_value(torrent).unwrap();
+        let mut h = Sha1::new();
+        h.update(&torrent[info_span.clone()]);
+        let expected = hex_encode(&h.finalize());
+        assert_eq!(resolved, expected);
+        assert_eq!(resolved.len(), 40);
+    }
+
+    #[test]
+    fn locate_finds_info_value() {
+        // `d8:announce9:example.x4:infod6:lengthi1e4:name1:aee` — a torrent
+        // with a non-info key before `info`, to verify the walker skips the
+        // preceding value correctly.
+        let torrent = b"d8:announce9:example.x4:infod6:lengthi1e4:name1:aee";
+        let span = locate_info_value(torrent).expect("info value must be found");
+        assert_eq!(&torrent[span.clone()], b"d6:lengthi1e4:name1:ae");
+    }
+
+    #[test]
+    fn rejects_garbage() {
+        let garbage = b"this is not a torrent";
+        assert!(locate_info_value(garbage).is_none());
+    }
+}

crates/torad/src/source/jackett.rs

@@ -0,0 +1,72 @@
+//! Handler for Jackett's `/dl/{indexer}/?jackett_apikey=...&path=...` proxy URLs.
+//!
+//! Jackett's download endpoint is not a static file: it re-authenticates to
+//! the upstream indexer, fetches the details page, and either returns the
+//! `.torrent` bytes (HTTP 200) or 302-redirects to a `magnet:` URI when the
+//! indexer has no file download. Some indexers (notably rutracker and
+//! filelist) also produce non-spec bencode with duplicate dict keys, which
+//! librqbit's strict parser rejects — so we tolerate that case via a
+//! byte-span SHA1 fallback (see [`super::info_hash`]).
+//!
+//! See:
+//! - <https://github.com/Jackett/Jackett/issues/8252> (proxy-link semantics)
+//! - <https://github.com/Jackett/Jackett/issues/16492> (non-spec .torrent files)
+
+use anyhow::{Context, Result};
+use async_trait::async_trait;
+use librqbit::Magnet;
+
+use super::http_fetch::{self, HttpFetchOutcome};
+use super::info_hash;
+use super::{Resolved, SourceHandler};
+
+/// Matches any HTTP(S) URL whose query string carries `jackett_apikey=`,
+/// which uniquely identifies a Jackett proxy download link regardless of the
+/// host/port Jackett is deployed on.
+const JACKETT_MARKER: &str = "jackett_apikey=";
+
+pub(crate) struct JackettHandler {
+    client: reqwest::Client,
+}
+
+impl JackettHandler {
+    pub(crate) fn new(client: reqwest::Client) -> Self {
+        Self { client }
+    }
+}
+
+#[async_trait]
+impl SourceHandler for JackettHandler {
+    fn matches(&self, source: &str) -> bool {
+        (source.starts_with("http://") || source.starts_with("https://"))
+            && source.contains(JACKETT_MARKER)
+    }
+
+    async fn resolve(&self, source: &str) -> Result<Resolved> {
+        let outcome = http_fetch::fetch(&self.client, source).await?;
+        match outcome {
+            HttpFetchOutcome::Magnet(magnet) => {
+                let parsed = Magnet::parse(&magnet)
+                    .with_context(|| format!("failed to parse redirected magnet: {magnet}"))?;
+                let id20 = parsed
+                    .as_id20()
+                    .context("redirected magnet has no v1 (BTIH) info hash")?;
+                // Store the magnet instead of the original Jackett URL: the
+                // magnet is stable, doesn't depend on Jackett being reachable
+                // at poller time, and is what librqbit will actually use.
+                Ok(Resolved {
+                    info_hash: id20.as_string(),
+                    rewritten_source: Some(magnet),
+                })
+            }
+            HttpFetchOutcome::Bytes(bytes) => {
+                let info_hash = info_hash::from_bytes(&bytes)
+                    .context("failed to extract info_hash from Jackett .torrent body")?;
+                Ok(Resolved {
+                    info_hash,
+                    rewritten_source: None,
+                })
+            }
+        }
+    }
+}

crates/torad/src/source/magnet.rs

@@ -0,0 +1,28 @@
+//! Handler for `magnet:` URIs. Extracts the BTIH v1 info-hash from the
+//! `xt=urn:btih:` parameter; no network IO.
+
+use anyhow::{Context, Result};
+use async_trait::async_trait;
+use librqbit::Magnet;
+
+use super::{Resolved, SourceHandler};
+
+pub(super) struct MagnetHandler;
+
+#[async_trait]
+impl SourceHandler for MagnetHandler {
+    fn matches(&self, source: &str) -> bool {
+        source.starts_with("magnet:")
+    }
+
+    async fn resolve(&self, source: &str) -> Result<Resolved> {
+        let parsed = Magnet::parse(source).context("failed to parse magnet link")?;
+        let id20 = parsed
+            .as_id20()
+            .context("magnet link has no v1 (BTIH) info hash")?;
+        Ok(Resolved {
+            info_hash: id20.as_string(),
+            rewritten_source: None,
+        })
+    }
+}

crates/torad/src/source/mod.rs

@@ -0,0 +1,78 @@
+//! Torrent-source resolution.
+//!
+//! A "source" is the opaque string a client hands to `add` — it may be a
+//! magnet URI, an HTTP(S) URL pointing at a `.torrent` file (Jackett's `/dl/`
+//! proxy, a direct indexer download, etc.), or a local file path.
+//!
+//! Each kind of source is handled by a [`SourceHandler`] implementation. The
+//! [`SourceResolver`] holds an ordered list of handlers and dispatches to the
+//! first one that claims the source via [`SourceHandler::matches`].
+//!
+//! Order matters: more-specific handlers (magnet, Jackett) must precede more
+//! general ones (HTTP, file).
+
+use anyhow::{Context, Result};
+use async_trait::async_trait;
+
+pub(crate) mod file;
+mod http_fetch;
+pub(crate) mod http_torrent;
+pub(crate) mod info_hash;
+pub(crate) mod jackett;
+pub(crate) mod magnet;
+
+/// Result of resolving a source string into an identifying info-hash.
+///
+/// `rewritten_source`, when set, replaces the original source for downstream
+/// storage. This lets a Jackett URL that 302-redirects to a magnet be stored
+/// as the magnet — cheaper and more reliable for the poller to re-fetch later.
+pub(crate) struct Resolved {
+    pub info_hash: String,
+    pub rewritten_source: Option<String>,
+}
+
+/// A handler for one kind of torrent source.
+#[async_trait]
+pub(crate) trait SourceHandler: Send + Sync {
+    /// Return `true` if this handler recognises the source string.
+    fn matches(&self, source: &str) -> bool;
+
+    /// Extract the info-hash (and optionally rewrite the source) from the
+    /// given source string. Called only when [`matches`](Self::matches)
+    /// returned `true`.
+    async fn resolve(&self, source: &str) -> Result<Resolved>;
+}
+
+/// Dispatches a source string to the first matching [`SourceHandler`].
+pub(crate) struct SourceResolver {
+    handlers: Vec<Box<dyn SourceHandler>>,
+}
+
+impl SourceResolver {
+    pub(crate) fn new() -> Result<Self> {
+        // Manual redirect policy: Jackett 302-redirects to `magnet:` URIs that
+        // reqwest would refuse to follow; we want to inspect `Location`
+        // ourselves so the magnet handler can take over.
+        let http_client = reqwest::Client::builder()
+            .redirect(reqwest::redirect::Policy::none())
+            .build()
+            .context("failed to build HTTP client")?;
+        Ok(Self {
+            handlers: vec![
+                Box::new(magnet::MagnetHandler),
+                Box::new(jackett::JackettHandler::new(http_client.clone())),
+                Box::new(http_torrent::HttpTorrentHandler::new(http_client)),
+                Box::new(file::FileHandler),
+            ],
+        })
+    }
+
+    pub(crate) async fn resolve(&self, source: &str) -> Result<Resolved> {
+        for handler in &self.handlers {
+            if handler.matches(source) {
+                return handler.resolve(source).await;
+            }
+        }
+        anyhow::bail!("no handler matched source: {source}")
+    }
+}

crates/torad/src/torrents.rs

@@ -19,7 +19,7 @@ use tracing::{error, info, warn};
 use uuid::Uuid;
 
 use crate::db::{self, TorrentRow, TorrentState};
-use crate::magnet;
+use crate::source::SourceResolver;
 
 const POLL_INTERVAL: Duration = Duration::from_secs(2);
 const BYTES_PER_MIB: f64 = 1_048_576.0;
@@ -34,6 +34,7 @@ pub struct TorrentManager {
     pool: PgPool,
     session: Arc<Session>,
     default_output_dir: PathBuf,
+    source: SourceResolver,
     tracked: Mutex<HashMap<Uuid, Arc<ManagedTorrent>>>,
 }
 
@@ -48,21 +49,24 @@ impl TorrentManager {
         let session = Session::new(download_dir.clone())
             .await
             .context("failed to create librqbit session")?;
+        let source = SourceResolver::new().context("failed to build source resolver")?;
         Ok(Arc::new(Self {
             pool,
             session,
             default_output_dir: download_dir,
+            source,
             tracked: Mutex::new(HashMap::new()),
         }))
     }
 
-    pub async fn add(&self, magnet: &str, output_dir: Option<&str>) -> Result<TorrentRow> {
-        let info_hash = magnet::info_hash(magnet)?;
+    pub async fn add(&self, source: &str, output_dir: Option<&str>) -> Result<TorrentRow> {
+        let resolved = self.source.resolve(source).await?;
+        let stored_source = resolved.rewritten_source.as_deref().unwrap_or(source);
         let output_path = output_dir
             .filter(|s| !s.is_empty())
             .map(str::to_string)
             .unwrap_or_else(|| self.default_output_dir.display().to_string());
-        db::insert_pending(&self.pool, &info_hash, magnet, &output_path).await
+        db::insert_pending(&self.pool, &resolved.info_hash, stored_source, &output_path).await
     }
 
     pub async fn get_status(&self, id: Uuid) -> Result<Option<TorrentStatus>> {