feat: implement /resolve

Signed-off-by: ljedrz <[email protected]>

Author: ljedrz

conformance/test/index.js

@@ -34,7 +34,16 @@ const factory = createFactory(options)
 //
 tests.miscellaneous(factory, { skip: [
   'dns',
-  'resolve',
+  // the cidBase param is not implemented yet
+  'should resolve an IPFS hash and return a base64url encoded CID in path',
+  // different Cid, the /path/to/testfile.txt suffix shouldn't be there
+  'should resolve an IPFS path link',
+  // different Cid, missing "/path/to" in the middle
+  'should resolve up to the last node across multiple nodes',
+  // expected "true", got "false"
+  'should resolve an IPNS DNS link',
+  // HTTP: not implemented
+  'should resolve IPNS link recursively',
   // these cause a hang 20% of time:
   'should respect timeout option when getting the node id',
   'should respect timeout option when getting the node version',

http/src/v0.rs

@@ -6,6 +6,7 @@ pub mod block;
 pub mod dag;
 pub mod dht;
 pub mod id;
+pub mod ipns;
 pub mod pin;
 pub mod pubsub;
 pub mod refs;
@@ -90,6 +91,7 @@ pub fn routes<T: IpfsTypes>(
         and_boxed!(warp::path!("get"), root_files::get(ipfs)),
         and_boxed!(warp::path!("refs" / "local"), refs::local(ipfs)),
         and_boxed!(warp::path!("refs"), refs::refs(ipfs)),
+        and_boxed!(warp::path!("resolve"), ipns::resolve(ipfs)),
         warp::path!("version")
             .and(query::<version::Query>())
             .and_then(version::version),

http/src/v0/ipns.rs

@@ -0,0 +1,45 @@
+use crate::v0::support::{with_ipfs, StringError, StringSerialized};
+use ipfs::{Ipfs, IpfsPath, IpfsTypes};
+use serde::{Deserialize, Serialize};
+use warp::{query, Filter, Rejection, Reply};
+
+#[derive(Debug, Deserialize)]
+pub struct ResolveQuery {
+    // the name to resolve
+    arg: StringSerialized<IpfsPath>,
+    #[serde(rename = "dht-record-count")]
+    dht_record_count: Option<usize>,
+    #[serde(rename = "dht-timeout")]
+    dht_timeout: Option<String>,
+}
+
+pub fn resolve<T: IpfsTypes>(
+    ipfs: &Ipfs<T>,
+) -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
+    with_ipfs(ipfs)
+        .and(query::<ResolveQuery>())
+        .and_then(resolve_query)
+}
+
+async fn resolve_query<T: IpfsTypes>(
+    ipfs: Ipfs<T>,
+    query: ResolveQuery,
+) -> Result<impl Reply, Rejection> {
+    let ResolveQuery { arg, .. } = query;
+    let name = arg.into_inner();
+    let path = ipfs
+        .resolve(&name)
+        .await
+        .map_err(StringError::from)?
+        .to_string();
+
+    let response = ResolveResponse { path };
+
+    Ok(warp::reply::json(&response))
+}
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "PascalCase")]
+struct ResolveResponse {
+    path: String,
+}

src/ipns/dns.rs

@@ -18,7 +18,7 @@ use thiserror::Error;
 #[error("no dnslink entry")]
 pub struct DnsLinkError;
 
-type FutureAnswer = Pin<Box<dyn Future<Output = Result<Answer, io::Error>>>>;
+type FutureAnswer = Pin<Box<dyn Future<Output = Result<Answer, io::Error>> + Send>>;
 
 pub struct DnsLinkFuture {
     query: SelectOk<FutureAnswer>,

src/lib.rs

@@ -852,6 +852,10 @@ impl<Types: IpfsTypes> Ipfs<Types> {
         refs::iplds_refs(self, iplds, max_depth, unique)
     }
 
+    pub async fn resolve(&self, path: &IpfsPath) -> Result<IpfsPath, Error> {
+        self.ipns().resolve(path).await
+    }
+
     /// Exit daemon.
     pub async fn exit_daemon(self) {
         // FIXME: this is a stopgap measure needed while repo is part of the struct Ipfs instead of