Heroic library scanner #93

src-tauri/src/epic_scanner.rs

@@ -0,0 +1,184 @@
+use log::{info, warn};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::{Path, PathBuf};
+use walkdir::WalkDir;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EpicGame {
+    pub app_name: String,
+    pub title: String,
+    pub install_path: String,
+    pub executable: String,
+    pub box_art_url: Option<String>,
+    pub scream_installed: bool,
+    pub koaloader_installed: bool,
+    /// True when Koaloader was installed using version.dll as a fallback
+    /// because no matching proxy import was detected in the game's PE files.
+    pub proxy_fallback_used: bool,
+}
+
+/// Minimal fields we need from installed.json entries.
+#[derive(Debug, Deserialize)]
+struct InstalledEntry {
+    title: String,
+    install_path: String,
+    executable: String,
+    #[serde(default)]
+    is_dlc: bool,
+}
+
+fn legendary_config_dir() -> Option<PathBuf> {
+    let home = std::env::var("HOME").ok()?;
+    let path = PathBuf::from(&home)
+        .join(".config")
+        .join("heroic")
+        .join("legendaryConfig")
+        .join("legendary");
+    if path.exists() {
+        Some(path)
+    } else {
+        warn!("Heroic legendary config dir not found at: {}", path.display());
+        None
+    }
+}
+
+pub fn scan_epic_games() -> Vec<EpicGame> {
+    let legendary_dir = match legendary_config_dir() {
+        Some(d) => d,
+        None => return Vec::new(),
+    };
+
+    let installed_path = legendary_dir.join("installed.json");
+    if !installed_path.exists() {
+        warn!("installed.json not found at: {}", installed_path.display());
+        return Vec::new();
+    }
+
+    let content = match fs::read_to_string(&installed_path) {
+        Ok(c) => c,
+        Err(e) => {
+            warn!("Failed to read installed.json: {}", e);
+            return Vec::new();
+        }
+    };
+
+    let installed: serde_json::Value = match serde_json::from_str(&content) {
+        Ok(v) => v,
+        Err(e) => {
+            warn!("Failed to parse installed.json: {}", e);
+            return Vec::new();
+        }
+    };
+
+    let metadata_dir = legendary_dir.join("metadata");
+    let mut games = Vec::new();
+
+    if let Some(obj) = installed.as_object() {
+        for (app_name, entry_val) in obj {
+            let entry: InstalledEntry = match serde_json::from_value(entry_val.clone()) {
+                Ok(e) => e,
+                Err(e) => {
+                    warn!("Failed to parse installed entry {}: {}", app_name, e);
+                    continue;
+                }
+            };
+
+            if entry.is_dlc {
+                continue;
+            }
+
+            let install_path = PathBuf::from(&entry.install_path);
+            if !install_path.exists() {
+                warn!(
+                    "Install path does not exist for {}: {}",
+                    app_name, entry.install_path
+                );
+                continue;
+            }
+
+            let box_art_url = get_box_art(&metadata_dir, app_name);
+            let scream_installed = check_screamapi_installed(&install_path);
+            let koaloader_installed = check_koaloader_installed(&install_path);
+
+            info!(
+                "Found Epic game: {} ({}), ScreamAPI={}, Koaloader={}",
+                entry.title, app_name, scream_installed, koaloader_installed
+            );
+
+            games.push(EpicGame {
+                app_name: app_name.clone(),
+                title: entry.title,
+                install_path: entry.install_path,
+                executable: entry.executable,
+                box_art_url,
+                scream_installed,
+                koaloader_installed,
+                proxy_fallback_used: false,
+            });
+        }
+    }
+
+    info!("Found {} Epic games", games.len());
+    games
+}
+
+/// Extract the "DieselGameBox" image URL from a game's metadata JSON.
+/// We read the top-level keyImages array directly from the JSON value,
+/// which avoids pulling in DLC images from dlcItemList.
+fn get_box_art(metadata_dir: &Path, app_name: &str) -> Option<String> {
+    let meta_path = metadata_dir.join(format!("{}.json", app_name));
+    if !meta_path.exists() {
+        return None;
+    }
+
+    let content = fs::read_to_string(&meta_path).ok()?;
+    let val: serde_json::Value = serde_json::from_str(&content).ok()?;
+
+    let key_images = val
+        .get("metadata")
+        .and_then(|m| m.get("keyImages"))
+        .and_then(|k| k.as_array())?;
+
+    // Prefer landscape (DieselGameBox), fall back to portrait or logo
+    for preferred in &["DieselGameBox", "DieselGameBoxTall", "DieselGameBoxLogo"] {
+        if let Some(url) = key_images.iter().find_map(|img| {
+            if img.get("type").and_then(|t| t.as_str()) == Some(preferred) {
+                img.get("url").and_then(|u| u.as_str()).map(str::to_owned)
+            } else {
+                None
+            }
+        }) {
+            return Some(url);
+        }
+    }
+
+    None
+}
+
+pub fn check_screamapi_installed(install_path: &Path) -> bool {
+    for entry in WalkDir::new(install_path)
+        .max_depth(8)
+        .into_iter()
+        .filter_map(Result::ok)
+    {
+        let filename = entry.file_name().to_string_lossy().to_lowercase();
+        if filename.starts_with("eossdk-win") && filename.ends_with("_o.dll") {
+            return true;
+        }
+    }
+    false
+}
+
+pub fn check_koaloader_installed(install_path: &Path) -> bool {
+    for entry in WalkDir::new(install_path)
+        .max_depth(4)
+        .into_iter()
+        .filter_map(Result::ok)
+    {
+        if entry.file_name().to_string_lossy() == "Koaloader.config.json" {
+            return true;
+        }
+    }
+    false
+}