feat(blog): Add canonical and alias slug routing from Notion Slugs with title fallback

1 files changed, 26 insertions, 2 deletions

diff --git a/src/notion.rs b/src/notion.rs
index 006466f..4dd7c5e 100644
--- a/src/notion.rs
+++ b/src/notion.rs
@@ -60,11 +60,35 @@ pub fn extract_number(
   properties: &serde_json::Value,
   field: &str,
 ) -> Option<u8> {
-  properties[field]["number"]
-    .as_u64()
+  extract_non_negative_whole_number(properties, field)
     .and_then(|number_value| u8::try_from(number_value).ok())
 }
 
+fn extract_non_negative_whole_number(
+  properties: &serde_json::Value,
+  field: &str,
+) -> Option<u64> {
+  let number_value = &properties[field]["number"];
+
+  number_value.as_u64().or_else(|| {
+    number_value.as_f64().and_then(|floating_value| {
+      if !floating_value.is_finite() || floating_value < 0.0 {
+        return None;
+      }
+
+      let rounded_value = floating_value.round();
+      let is_whole_number =
+        (floating_value - rounded_value).abs() <= f64::EPSILON;
+
+      if !is_whole_number {
+        return None;
+      }
+
+      format!("{rounded_value:.0}").parse::<u64>().ok()
+    })
+  })
+}
+
 pub fn extract_date(properties: &serde_json::Value, field: &str) -> String {
   properties[field]["date"]["start"].as_str().unwrap_or("").to_string()
 }