add failing test

src/service/media/mod.rs

@@ -224,3 +224,87 @@ impl Service {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::path::PathBuf;
+
+    use super::*;
+
+    struct MockedKVDatabase;
+
+    impl Data for MockedKVDatabase {
+        fn create_file_metadata(
+            &self,
+            mxc: String,
+            width: u32,
+            height: u32,
+            content_disposition: Option<&str>,
+            content_type: Option<&str>,
+        ) -> Result<Vec<u8>> {
+            // copied from src/database/key_value/media.rs
+            let mut key = mxc.as_bytes().to_vec();
+            key.push(0xff);
+            key.extend_from_slice(&width.to_be_bytes());
+            key.extend_from_slice(&height.to_be_bytes());
+            key.push(0xff);
+            key.extend_from_slice(
+                content_disposition
+                    .as_ref()
+                    .map(|f| f.as_bytes())
+                    .unwrap_or_default(),
+            );
+            key.push(0xff);
+            key.extend_from_slice(
+                content_type
+                    .as_ref()
+                    .map(|c| c.as_bytes())
+                    .unwrap_or_default(),
+            );
+
+            Ok(key)
+        }
+
+        fn search_file_metadata(
+            &self,
+            mxc: String,
+            width: u32,
+            height: u32,
+        ) -> Result<(Option<String>, Option<String>, Vec<u8>)> {
+            todo!()
+        }
+    }
+
+    #[tokio::test]
+    async fn long_file_names_works() {
+        static DB: MockedKVDatabase = MockedKVDatabase;
+        let media = Service { db: &DB };
+
+        let mxc = "mxc://example.com/ascERGshawAWawugaAcauga".to_owned();
+        let width = 100;
+        let height = 100;
+        let content_disposition = "attachment; filename=\"this is a very long file name with spaces and special characters like äöüß and even emoji like 🦀.png\"";
+        let content_type = "image/png";
+        let key = media
+            .db
+            .create_file_metadata(
+                mxc,
+                width,
+                height,
+                Some(content_disposition),
+                Some(content_type),
+            )
+            .unwrap();
+        let mut r = PathBuf::new();
+        r.push("/tmp");
+        r.push("media");
+        r.push(base64::encode_config(key, base64::URL_SAFE_NO_PAD));
+        // Check that the file path is not longer than 255 characters
+        // (255 is the maximum length of a file path on most file systems)
+        assert!(
+            r.to_str().unwrap().len() <= 255,
+            "File path is too long: {}",
+            r.to_str().unwrap().len()
+        );
+    }
+}