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

src/gitea_client/mod.rs

@@ -1,4 +1,6 @@
+use base64::{engine::general_purpose, Engine as _};
 use serde::Deserialize;
+use tracing::debug;
 
 use self::error::GiteaClientError;
 pub(crate) mod error;
@@ -30,7 +32,7 @@ impl GiteaClient {
         let mut num_responses: u64 = 0;
         loop {
             let url = format!(
-                "{api_root}/v1/repos/{owner}/{repo}/git/trees/{commit}?recursive=true&per_page=10{page}",
+                "{api_root}/v1/repos/{owner}/{repo}/git/trees/{commit}?recursive=true&per_page=100{page}",
                 api_root = self.api_root,
                 owner = owner.as_ref(),
                 repo = repo.as_ref(),
@@ -70,6 +72,27 @@ impl GiteaClient {
         }
         Ok(Tree::new(files))
     }
+
+    pub(crate) async fn read_file(
+        &self,
+        file_reference: &TreeFileReference,
+    ) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
+        let response = self
+            .http_client
+            .get(&file_reference.url)
+            .header("Authorization", format!("token {}", self.token))
+            .send()
+            .await?;
+        let response = response.error_for_status()?;
+        let body = response.text().await?;
+        debug!("read_file response: {}", body);
+        let parsed_body: ResponseReadFile = serde_json::from_str(body.as_str())?;
+        assert!(
+            parsed_body.encoding == "base64",
+            "We currently only support base64 file encoding from gitea."
+        );
+        Ok(general_purpose::STANDARD.decode(parsed_body.content)?)
+    }
 }
 
 /// A single API response for GetTree containing only one page.
@@ -101,13 +124,13 @@ pub(crate) struct Tree {
 
 #[derive(Debug)]
 pub(crate) struct TreeFileReference {
-    path: String,
-    url: String,
+    pub(crate) path: String,
+    pub(crate) url: String,
 }
 
 impl Tree {
     pub(crate) fn new(files: Vec<TreeFileReference>) -> Tree {
-        Tree { files: Vec::new() }
+        Tree { files }
     }
 }
 
@@ -119,3 +142,12 @@ impl TreeFileReference {
         }
     }
 }
+
+#[derive(Debug, Deserialize)]
+struct ResponseReadFile {
+    content: String,
+    encoding: String,
+    url: String,
+    sha: String,
+    size: u64,
+}