feat: detect local grasp repositories (#21)

Reviewed-on: #21

crates/signed_git/src/lib.rs

@@ -1,6 +1,7 @@
 mod cache;
 mod diff;
 mod history;
+mod nip34;
 mod patch;
 mod remote;
 mod repo;
@@ -19,6 +20,9 @@ pub use history::{
     CommitList, FileCommit, MAX_LISTED_COMMITS, all_commits, head_commit, worktree_all_commits,
     worktree_commit, worktree_commit_range_commits, worktree_last_commits,
 };
+pub use nip34::{
+    GraspSignals, Nip34Binding, Nip34Kind, detect_nip34, is_grasp_url, set_nostr_repo,
+};
 pub use patch::{
     apply_patch, format_patch_between, patch_commits, patch_diffs, split_patch_series,
 };
@@ -32,7 +36,7 @@ pub use repo::{
     repo_tags, root_commit, worktree_branches, worktree_current_branch, worktree_ref_exists,
     worktree_ref_state,
 };
-pub use scan::find_git_repos;
+pub use scan::{LocalRepo, find_git_repos};
 pub use worktree::{
     WorktreeSnapshot, find_readme, worktree_checkout_branch, worktree_checkout_tag,
     worktree_commits_ahead, worktree_dirty, worktree_entries, worktree_read, worktree_snapshot,

crates/signed_git/src/nip34.rs

@@ -0,0 +1,454 @@
+use std::path::Path;
+
+use anyhow::Result;
+use gix::bstr::ByteSlice;
+use nostr::prelude::*;
+
+/// The kind of NIP-34 relationship a local repository has on disk.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Nip34Kind {
+    /// Bound to a NIP-34 coordinate, by `nak`'s `nip34.json` or `ngit`'s `nostr.repo`.
+    Initialized,
+    /// Cloned from a `nostr://` remote but never initialized locally.
+    Cloned,
+    /// Nostr tooling touched the repository but no binding is recoverable.
+    ToolingOnly,
+}
+
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub struct GraspSignals {
+    pub nip34_json: bool,
+    pub nip34_excluded: bool,
+    pub nostr_repo_config: bool,
+    pub nostr_remote: bool,
+    pub grasp_remote: bool,
+    /// `nip34_grasp_remote` is the `nak`-specific `nip34/grasp/<host>` remote name.
+    pub nip34_grasp_remote: bool,
+    pub nip34_state_refs: bool,
+    pub nostr_cache: bool,
+    pub nostr_aux_config: bool,
+    pub maintainers_yaml: bool,
+}
+
+impl GraspSignals {
+    pub fn any(&self) -> bool {
+        *self != Self::default()
+    }
+}
+
+/// What a local repository's on-disk state says about its NIP-34 binding.
+#[derive(Debug, Clone, PartialEq)]
+pub struct Nip34Binding {
+    pub kind: Nip34Kind,
+    pub signals: GraspSignals,
+    /// Coordinate owner and identifier, from `nip34.json` or `nostr.repo`.
+    pub owner: Option<PublicKey>,
+    pub identifier: Option<String>,
+    pub grasp_urls: Vec<String>,
+}
+
+#[derive(serde::Deserialize)]
+struct Nip34Json {
+    identifier: Option<String>,
+    owner: Option<String>,
+}
+
+pub fn detect_nip34(repo_path: &Path) -> Option<Nip34Binding> {
+    let repo = gix::open(repo_path).ok()?;
+    let common_dir = repo.common_dir().to_path_buf();
+    let workdir = repo.workdir().map(Path::to_path_buf);
+
+    let mut signals = GraspSignals::default();
+    let mut owner: Option<PublicKey> = None;
+    let mut identifier: Option<String> = None;
+    let mut grasp_urls: Vec<String> = Vec::new();
+
+    if let Some(workdir) = &workdir {
+        if let Ok(bytes) = std::fs::read(workdir.join("nip34.json"))
+            && let Ok(config) = serde_json::from_slice::<Nip34Json>(&bytes)
+        {
+            signals.nip34_json = true;
+            identifier = config.identifier.and_then(non_empty);
+            owner = config
+                .owner
+                .as_deref()
+                .and_then(|value| PublicKey::parse(value).ok());
+        }
+
+        if workdir.join("maintainers.yaml").is_file() {
+            signals.maintainers_yaml = true;
+        }
+    }
+
+    if let Ok(exclude) = std::fs::read_to_string(common_dir.join("info/exclude"))
+        && exclude.contains("nip34.json")
+    {
+        signals.nip34_excluded = true;
+    }
+
+    // `ngit` keeps its repository event cache in the Git common directory.
+    if common_dir.join("nostr-cache.lmdb").is_file() {
+        signals.nostr_cache = true;
+    }
+
+    // `ngit` reads and writes `nostr.repo` at repository-local scope only.
+    if let Ok(config) = gix::config::File::from_path_no_includes(
+        common_dir.join("config"),
+        gix::config::Source::Local,
+    ) {
+        if let Some(value) = config.string("nostr.repo")
+            && let Some((key, id)) = coordinate_from_naddr(&value.to_str_lossy())
+        {
+            signals.nostr_repo_config = true;
+            owner = Some(key);
+            identifier = Some(id);
+        }
+
+        for key in ["nostr.repo-relay-only", "nostr.nostate", "nostr.private"] {
+            if config.string(key).is_some() {
+                signals.nostr_aux_config = true;
+            }
+        }
+
+        if let Some(sections) = config.sections_by_name("remote") {
+            for section in sections {
+                let Some(name) = section.header().subsection_name() else {
+                    continue;
+                };
+                let nak_grasp_remote = name.to_str_lossy().starts_with("nip34/grasp/");
+
+                for url in section.values("url") {
+                    let url = url.to_str_lossy();
+
+                    if url.starts_with("nostr://") {
+                        signals.nostr_remote = true;
+                        // Strong markers win; only fill an empty binding.
+                        if owner.is_none()
+                            && identifier.is_none()
+                            && let Some((key, id)) = parse_nostr_url(&url)
+                        {
+                            owner = Some(key);
+                            identifier = Some(id);
+                        }
+                    }
+
+                    if is_grasp_url(&url) {
+                        signals.grasp_remote = true;
+                        signals.nip34_grasp_remote |= nak_grasp_remote;
+                        grasp_urls.push(url.to_string());
+
+                        if owner.is_none()
+                            && identifier.is_none()
+                            && let Some((key, id)) = grasp_parts(&url)
+                        {
+                            owner = Some(key);
+                            identifier = Some(id);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    // `nak` materializes a kind-30618 state as `refs/heads/nip34/state/*`.
+    if let Ok(platform) = repo.references()
+        && let Ok(mut refs) = platform.prefixed(b"refs/heads/nip34/state/")
+        && refs.next().is_some()
+    {
+        signals.nip34_state_refs = true;
+    }
+
+    if !signals.any() {
+        return None;
+    }
+
+    let kind = if signals.nip34_json
+        || signals.nostr_repo_config
+        || signals.nip34_grasp_remote
+        || signals.nip34_state_refs
+    {
+        Nip34Kind::Initialized
+    } else if signals.nostr_remote {
+        Nip34Kind::Cloned
+    } else {
+        Nip34Kind::ToolingOnly
+    };
+
+    Some(Nip34Binding {
+        kind,
+        signals,
+        owner,
+        identifier,
+        grasp_urls,
+    })
+}
+
+/// Record a repository's NIP-34 coordinate in its local `nostr.repo` config.
+pub fn set_nostr_repo(repo_path: &Path, naddr: &str) -> Result<()> {
+    let repo = gix::open(repo_path)?;
+
+    crate::remote::edit_local_config(&repo, |config| {
+        config.set_raw_value("nostr.repo", naddr)?;
+        Ok(())
+    })
+}
+
+/// Mirrors `nak`'s `IsGraspURL`: two path segments, a path of at least 65 bytes,
+/// and a first segment that decodes as an `npub`.
+pub fn is_grasp_url(url: &str) -> bool {
+    let Ok(parsed) = Url::parse(url) else {
+        return false;
+    };
+
+    if !matches!(parsed.scheme(), "http" | "https" | "grasp") {
+        return false;
+    }
+
+    let path = parsed.path();
+    if path.matches('/').count() != 2 || path.len() < 65 {
+        return false;
+    }
+
+    grasp_parts(url).is_some()
+}
+
+fn grasp_parts(url: &str) -> Option<(PublicKey, String)> {
+    let parsed = Url::parse(url).ok()?;
+    let mut segments = parsed.path_segments()?.filter(|part| !part.is_empty());
+
+    let owner = PublicKey::parse(segments.next()?).ok()?;
+    let identifier = non_empty(segments.next()?.trim_end_matches(".git"))?;
+
+    Some((owner, identifier))
+}
+
+fn coordinate_from_naddr(value: &str) -> Option<(PublicKey, String)> {
+    let coordinate = Nip19Coordinate::from_bech32(value).ok()?;
+    if coordinate.kind != Kind::GitRepoAnnouncement {
+        return None;
+    }
+
+    let identifier = non_empty(coordinate.identifier.clone())?;
+    Some((coordinate.public_key, identifier))
+}
+
+/// Handles a bare `naddr`, an `npub`, and the optional `[ssh-key-file@]`,
+/// `[protocol/]` and `[relay/]` components. An `nip05` owner yields no binding.
+fn parse_nostr_url(url: &str) -> Option<(PublicKey, String)> {
+    let rest = url.strip_prefix("nostr://")?;
+
+    if rest.starts_with("naddr1") {
+        return coordinate_from_naddr(rest);
+    }
+
+    let rest = rest.rsplit_once('@').map_or(rest, |(_, after)| after);
+    let mut parts: Vec<&str> = rest.split('/').filter(|part| !part.is_empty()).collect();
+
+    if parts
+        .first()
+        .is_some_and(|first| matches!(*first, "ssh" | "https" | "http"))
+    {
+        parts.remove(0);
+    }
+
+    // `[owner, (relay), identifier]`.
+    if parts.len() < 2 {
+        return None;
+    }
+
+    let owner = PublicKey::parse(parts[0]).ok()?;
+    let identifier = non_empty(parts.last()?.trim_end_matches(".git"))?;
+
+    Some((owner, identifier))
+}
+
+fn non_empty(value: impl Into<String>) -> Option<String> {
+    let value = value.into();
+    (!value.is_empty()).then_some(value)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::process::Command;
+
+    use super::*;
+
+    fn init_repo() -> (tempfile::TempDir, std::path::PathBuf) {
+        let dir = tempfile::tempdir().expect("tempdir");
+        let path = dir.path().join("repo");
+        std::fs::create_dir_all(&path).expect("mkdir");
+        git(&path, &["init", "-q"]);
+        (dir, path)
+    }
+
+    fn git(dir: &Path, args: &[&str]) {
+        let status = Command::new("git")
+            .current_dir(dir)
+            .env("GIT_AUTHOR_NAME", "Test Author")
+            .env("GIT_AUTHOR_EMAIL", "test@example.com")
+            .env("GIT_COMMITTER_NAME", "Test Author")
+            .env("GIT_COMMITTER_EMAIL", "test@example.com")
+            .env("GIT_EDITOR", "true")
+            .args(args)
+            .status()
+            .expect("spawn git");
+        assert!(status.success(), "git {args:?} failed");
+    }
+
+    fn key() -> PublicKey {
+        Keys::generate().public_key()
+    }
+
+    fn naddr(kind: Kind, owner: PublicKey, identifier: &str) -> String {
+        let coordinate = Coordinate::new(kind, owner).identifier(identifier);
+        Nip19Coordinate::new(coordinate, Vec::<RelayUrl>::new())
+            .to_bech32()
+            .expect("naddr")
+    }
+
+    #[test]
+    fn plain_repository_has_no_binding() {
+        let (_dir, path) = init_repo();
+        assert!(detect_nip34(&path).is_none());
+    }
+
+    #[test]
+    fn nip34_json_marks_a_repository_initialized() {
+        let (_dir, path) = init_repo();
+        let owner = key();
+        let npub = owner.to_bech32().expect("npub");
+        std::fs::write(
+            path.join("nip34.json"),
+            format!(r#"{{"identifier":"my-repo","owner":"{npub}"}}"#),
+        )
+        .expect("write");
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Initialized);
+        assert!(binding.signals.nip34_json);
+        assert_eq!(binding.owner, Some(owner));
+        assert_eq!(binding.identifier.as_deref(), Some("my-repo"));
+    }
+
+    #[test]
+    fn malformed_nip34_json_is_ignored() {
+        let (_dir, path) = init_repo();
+        std::fs::write(path.join("nip34.json"), b"not json").expect("write");
+
+        assert!(detect_nip34(&path).is_none());
+    }
+
+    #[test]
+    fn nak_exclude_and_state_refs_are_detected() {
+        let (_dir, path) = init_repo();
+
+        std::fs::create_dir_all(path.join(".git/info")).expect("mkdir");
+        std::fs::write(path.join(".git/info/exclude"), "nip34.json\n").expect("write");
+
+        git(&path, &["commit", "-q", "--allow-empty", "-m", "initial"]);
+        git(
+            &path,
+            &["update-ref", "refs/heads/nip34/state/HEAD", "HEAD"],
+        );
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Initialized);
+        assert!(binding.signals.nip34_excluded);
+        assert!(binding.signals.nip34_state_refs);
+    }
+
+    #[test]
+    fn nostr_repo_config_marks_a_repository_initialized() {
+        let (_dir, path) = init_repo();
+        let owner = key();
+        let naddr = naddr(Kind::GitRepoAnnouncement, owner, "my-repo");
+        git(&path, &["config", "nostr.repo", &naddr]);
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Initialized);
+        assert!(binding.signals.nostr_repo_config);
+        assert_eq!(binding.owner, Some(owner));
+        assert_eq!(binding.identifier.as_deref(), Some("my-repo"));
+    }
+
+    #[test]
+    fn the_written_nostr_repo_marker_is_detected() {
+        let (_dir, path) = init_repo();
+        let owner = key();
+        let naddr = naddr(Kind::GitRepoAnnouncement, owner, "my-repo");
+
+        set_nostr_repo(&path, &naddr).expect("write marker");
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Initialized);
+        assert!(binding.signals.nostr_repo_config);
+        assert_eq!(binding.owner, Some(owner));
+        assert_eq!(binding.identifier.as_deref(), Some("my-repo"));
+    }
+
+    #[test]
+    fn nostr_remote_is_a_nip34_clone() {
+        let (_dir, path) = init_repo();
+        let owner = key();
+        let npub = owner.to_bech32().expect("npub");
+        let url = format!("nostr://{npub}/relay.ngit.dev/my-repo");
+        git(&path, &["remote", "add", "origin", &url]);
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Cloned);
+        assert!(binding.signals.nostr_remote);
+        assert_eq!(binding.owner, Some(owner));
+        assert_eq!(binding.identifier.as_deref(), Some("my-repo"));
+    }
+
+    #[test]
+    fn nak_grasp_remote_marks_a_repository_initialized() {
+        let (_dir, path) = init_repo();
+        let owner = key();
+        let npub = owner.to_bech32().expect("npub");
+        let url = format!("https://gitnostr.com/{npub}/my-repo.git");
+        git(
+            &path,
+            &["config", "remote.nip34/grasp/gitnostr.com.url", &url],
+        );
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::Initialized);
+        assert!(binding.signals.nip34_grasp_remote);
+        assert!(binding.signals.grasp_remote);
+        assert_eq!(binding.grasp_urls, vec![url]);
+        assert_eq!(binding.owner, Some(owner));
+        assert_eq!(binding.identifier.as_deref(), Some("my-repo"));
+    }
+
+    #[test]
+    fn nostr_cache_alone_is_tooling_only() {
+        let (_dir, path) = init_repo();
+        std::fs::write(path.join(".git/nostr-cache.lmdb"), b"cache").expect("write");
+
+        let binding = detect_nip34(&path).expect("binding");
+        assert_eq!(binding.kind, Nip34Kind::ToolingOnly);
+        assert!(binding.signals.nostr_cache);
+    }
+
+    #[test]
+    fn grasp_urls_are_recognised_by_shape() {
+        let owner = key();
+        let npub = owner.to_bech32().expect("npub");
+
+        assert!(is_grasp_url(&format!(
+            "https://gitnostr.com/{npub}/my-repo.git"
+        )));
+        assert!(is_grasp_url(&format!(
+            "grasp://gitnostr.com/{npub}/my-repo.git"
+        )));
+
+        assert!(!is_grasp_url("https://gitnostr.com/my-repo.git"));
+        assert!(!is_grasp_url(
+            "https://gitnostr.com/not-a-pubkey/my-repo.git"
+        ));
+        assert!(!is_grasp_url(&format!(
+            "ssh://gitnostr.com/{npub}/my-repo.git"
+        )));
+    }
+}

crates/signed_git/src/remote.rs

@@ -252,10 +252,7 @@ pub fn set_origin(repo_path: &Path, url: &str) -> Result<()> {
 }
 
 /// Apply `edit` to the repository-local configuration and persist it.
-///
-/// The config file is locked while it is read, edited and written back,
-/// like git would when running `git config` or `git remote`.
-fn edit_local_config(
+pub(crate) fn edit_local_config(
     repo: &gix::Repository,
     edit: impl FnOnce(&mut gix::config::File) -> Result<()>,
 ) -> Result<()> {

crates/signed_git/src/scan.rs

@@ -2,12 +2,21 @@ use std::path::{Path, PathBuf};
 
 use ignore::WalkBuilder;
 
+use crate::nip34::{Nip34Binding, detect_nip34};
+
 /// Caps nesting so pathological trees can't stall the scan.
 const SCAN_MAX_DEPTH: usize = 12;
 
-/// Walk `root` recursively and collect the paths of git repositories below it.
-/// `.gitignore` and `.ignore` files are honoured.
-pub fn find_git_repos(root: &Path) -> Vec<PathBuf> {
+/// A git repository discovered under a scan root.
+#[derive(Debug, Clone)]
+pub struct LocalRepo {
+    pub path: PathBuf,
+    /// `None` for a plain repository.
+    pub nip34: Option<Nip34Binding>,
+}
+
+/// Walk `root` recursively and collect the git repositories below it.
+pub fn find_git_repos(root: &Path) -> Vec<LocalRepo> {
     if !root.is_dir() {
         return Vec::new();
     }
@@ -38,4 +47,10 @@ pub fn find_git_repos(root: &Path) -> Vec<PathBuf> {
     }
 
     roots
+        .into_iter()
+        .map(|path| {
+            let nip34 = detect_nip34(&path);
+            LocalRepo { path, nip34 }
+        })
+        .collect()
 }

crates/signed_git/src/tests.rs

@@ -42,7 +42,10 @@ fn find_git_repos_discovers_repositories_recursively() {
     std::fs::create_dir_all(outer.join(".git")).unwrap();
     std::fs::create_dir_all(outer.join("sub/other/.git")).unwrap();
 
-    let mut found = find_git_repos(root);
+    let mut found: Vec<PathBuf> = find_git_repos(root)
+        .into_iter()
+        .map(|repo| repo.path)
+        .collect();
     found.sort();
 
     let mut expected = vec![