Implement basic game files download logic

Implement core clap arguments

Respect XDG_BASE_DIR

Currently library extraction is broken because it assumes every instace has it's own library folder. This should be refactored so instances share libraries

Signed-off-by: Filip Wandzio <contact@philw.dev>

1 files changed, 80 insertions, 0 deletions

diff --git a/src/minecraft/manifests.rs b/src/minecraft/manifests.rs
new file mode 100644
index 0000000..3cc59af
--- /dev/null
+++ b/src/minecraft/manifests.rs
@@ -0,0 +1,80 @@
+#![allow(dead_code)]
+use reqwest;
+use serde::Deserialize;
+
+use crate::{constants::VERSION_MANIFEST_URL, errors::McError};
+
+#[derive(Debug, Deserialize)]
+pub struct Version {
+    pub id: String,
+
+    #[serde(rename = "mainClass")]
+    pub main_class: String,
+
+    pub downloads: Downloads,
+    pub libraries: Vec<Library>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Downloads {
+    pub client: DownloadInfo,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct DownloadInfo {
+    pub url: String,
+    pub sha1: String,
+    pub size: u64,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Library {
+    pub downloads: LibraryDownloads,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct LibraryDownloads {
+    pub artifact: Option<LibraryArtifact>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct LibraryArtifact {
+    pub path: String,
+    pub url: String,
+    pub sha1: String,
+    pub size: u64,
+}
+
+pub async fn load_version(cfg: &crate::config::Config) -> Result<Version, McError> {
+    let manifest_text = reqwest::get(VERSION_MANIFEST_URL)
+        .await?
+        .text()
+        .await?;
+    let root: serde_json::Value = serde_json::from_str(&manifest_text)?;
+    let version_id = if cfg.version == "latest" {
+        root["latest"]["release"]
+            .as_str()
+            .ok_or_else(|| McError::Config("missing latest.release".into()))?
+            .to_string()
+    } else {
+        cfg.version.clone()
+    };
+
+    let versions = root["versions"]
+        .as_array()
+        .ok_or_else(|| McError::Config("missing versions array".into()))?;
+
+    let version_entry = versions
+        .iter()
+        .find(|v| v["id"].as_str() == Some(&version_id))
+        .ok_or_else(|| McError::Config(format!("version '{}' not found", version_id)))?;
+
+    let url = version_entry["url"]
+        .as_str()
+        .ok_or_else(|| McError::Config("missing version url".into()))?;
+
+    let version_text = reqwest::get(url).await?.text().await?;
+    let version: Version = serde_json::from_str(&version_text)?;
+
+    Ok(version)
+}