client-api: Add a borrowing iterator for SignedKeys

crates/ruma-client-api/src/keys/upload_signatures.rs

@@ -16,6 +16,8 @@ pub mod v3 {
 
     use crate::PrivOwnedStr;
 
+    pub use super::iter::SignedKeysIter;
+
     ruma_api! {
         metadata: {
             description: "Publishes cross-signing signatures for the user.",
@@ -81,6 +83,11 @@ pub mod v3 {
         ) {
             self.0.insert(cross_signing_key_id, cross_signing_keys.into_json());
         }
+
+        /// Returns an iterator over the keys.
+        pub fn iter(&self) -> SignedKeysIter<'_> {
+            SignedKeysIter(self.0.iter())
+        }
     }
 
     /// A failure to process a signed key.
@@ -105,3 +112,5 @@ pub mod v3 {
         _Custom(PrivOwnedStr),
     }
 }
+
+mod iter;

crates/ruma-client-api/src/keys/upload_signatures/iter.rs

@@ -0,0 +1,26 @@
+use std::collections::btree_map;
+
+use serde_json::value::RawValue as RawJsonValue;
+
+use super::v3::SignedKeys;
+
+impl<'a> IntoIterator for &'a SignedKeys {
+    type Item = (&'a str, &'a RawJsonValue);
+    type IntoIter = SignedKeysIter<'a>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
+
+/// An iterator over signed key IDs and their associated data.
+#[derive(Debug)]
+pub struct SignedKeysIter<'a>(pub(super) btree_map::Iter<'a, Box<str>, Box<RawJsonValue>>);
+
+impl<'a> Iterator for SignedKeysIter<'a> {
+    type Item = (&'a str, &'a RawJsonValue);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.0.next().map(|(id, val)| (&**id, &**val))
+    }
+}