Extract PatchSeries module and remove require_relay_accepted helper

crates/signed_state/src/patch_series.rs

@@ -0,0 +1,50 @@
+use bitcoin_hashes::sha1::Hash as Sha1Hash;
+use signed_git::PatchParser;
+
+/// NIP-34 suggests patches when each event is under 60kb.
+pub(crate) const MAX_PATCH_EVENT_BYTES: usize = 60 * 1024;
+
+pub(crate) struct PatchSeries {
+    pub(crate) parts: Vec<String>,
+}
+
+impl PatchSeries {
+    pub(crate) fn parse(patch: &str) -> Self {
+        Self {
+            parts: PatchParser::split_patch_series(patch)
+                .into_iter()
+                .map(str::to_owned)
+                .collect(),
+        }
+    }
+
+    /// Returns the length of the first part that exceeds the NIP-34 recommended size.
+    pub(crate) fn oversized_length(&self) -> Option<usize> {
+        self.parts
+            .iter()
+            .map(String::len)
+            .find(|length| *length > MAX_PATCH_EVENT_BYTES)
+    }
+
+    /// The last commit of the series, which is the tip of the branch.
+    pub(crate) fn tip_commit(&self) -> Option<Sha1Hash> {
+        self.parts
+            .last()
+            .and_then(|part| patch_current_commit(part))
+            .and_then(|hex| hex.parse::<Sha1Hash>().ok())
+    }
+
+    pub(crate) fn commit_of(&self, index: usize) -> Option<&str> {
+        self.parts
+            .get(index)
+            .and_then(|part| patch_current_commit(part))
+            .filter(|hex| hex.len() == 40)
+    }
+}
+
+/// The `From <commit>` header on the first line.
+fn patch_current_commit(patch: &str) -> Option<&str> {
+    let line = patch.lines().next()?;
+    let hex = line.strip_prefix("From ")?;
+    hex.split_whitespace().next().filter(|hex| hex.len() == 40)
+}