Fetch the in-repo config file from the remote repo.

src/discovery.rs

@@ -0,0 +1,24 @@
+use crate::gitea_client::GiteaClient;
+use crate::gitea_client::TreeFileReference;
+use crate::in_repo_config::InRepoConfig;
+
+pub(crate) async fn discover_webhook_bridge_config<O: AsRef<str>, R: AsRef<str>, C: AsRef<str>>(
+    gitea: &GiteaClient,
+    owner: O,
+    repo: R,
+    commit: C,
+) -> Result<InRepoConfig, Box<dyn std::error::Error>> {
+    let repo_tree = gitea.get_tree(owner, repo, commit).await?;
+    let in_repo_config_reference = repo_tree
+        .files
+        .iter()
+        .filter(|file_reference| file_reference.path == ".webhook_bridge/webhook_bridge.toml")
+        .next()
+        .ok_or("File not found in remote repo: .webhook_bridge/webhook_bridge.toml.")?;
+
+    let in_repo_config_contents =
+        String::from_utf8(gitea.read_file(in_repo_config_reference).await?)?;
+    let parsed_in_repo_config = InRepoConfig::from_str(in_repo_config_contents)?;
+
+    Ok(parsed_in_repo_config)
+}