fix(pkgs/back): Use rocket to manage the configuration values

This reduces the amount of needed `unwraps`/`expects` and allows us to
streamline the parsing processes.

1 files changed, 58 insertions, 0 deletions

diff --git a/pkgs/by-name/ba/back/src/config/mod.rs b/pkgs/by-name/ba/back/src/config/mod.rs
new file mode 100644
index 0000000..4986a41
--- /dev/null
+++ b/pkgs/by-name/ba/back/src/config/mod.rs
@@ -0,0 +1,58 @@
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use gix::ThreadSafeRepository;
+use serde::Deserialize;
+use url::Url;
+
+use crate::error::{self, Error};
+
+pub struct BackConfig {
+    // NOTE(@bpeetz): We do not need to html escape this, as the value must be a valid url. As such
+    // `<tags>` of all kinds _should_ be invalid.  <2024-12-26>
+    pub source_code_repository_url: Url,
+    pub repository: ThreadSafeRepository,
+}
+
+#[derive(Deserialize)]
+struct RawBackConfig {
+    source_code_repository_url: Url,
+    repository_path: PathBuf,
+}
+
+impl BackConfig {
+    pub fn from_config_file(path: &Path) -> error::Result<Self> {
+        let value = fs::read_to_string(path).map_err(|err| Error::ConfigRead {
+            file: path.to_owned(),
+            error: err,
+        })?;
+
+        let raw: RawBackConfig =
+            serde_json::from_str(&value).map_err(|err| Error::ConfigParse {
+                file: path.to_owned(),
+                error: err,
+            })?;
+
+        Self::try_from(raw)
+    }
+}
+
+impl TryFrom<RawBackConfig> for BackConfig {
+    type Error = error::Error;
+
+    fn try_from(value: RawBackConfig) -> Result<Self, Self::Error> {
+        let repository = {
+            ThreadSafeRepository::open(&value.repository_path).map_err(|err| Error::RepoOpen {
+                repository_path: value.repository_path,
+                error: Box::new(err),
+            })
+        }?;
+
+        Ok(Self {
+            repository,
+            source_code_repository_url: value.source_code_repository_url,
+        })
+    }
+}