chore: initialize qiming workspace repository

qimingclaw/crates/windows-sandbox-helper/src/cap.rs

@@ -0,0 +1,51 @@
+//! Capability SID generation and persistence.
+
+use rand::rngs::SmallRng;
+use rand::RngCore;
+use rand::SeedableRng;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::Path;
+use std::path::PathBuf;
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct CapSids {
+    pub workspace: String,
+    pub readonly: String,
+}
+
+pub fn cap_sid_file(home: &Path) -> PathBuf {
+    home.join("cap_sid")
+}
+
+fn make_random_cap_sid_string() -> String {
+    let mut rng = SmallRng::from_entropy();
+    let a = rng.next_u32();
+    let b = rng.next_u32();
+    let c = rng.next_u32();
+    let d = rng.next_u32();
+    format!("S-1-5-21-{}-{}-{}-{}", a, b, c, d)
+}
+
+pub fn load_or_create_cap_sids(home: &Path) -> CapSids {
+    let path = cap_sid_file(home);
+    if path.exists() {
+        if let Ok(txt) = fs::read_to_string(&path) {
+            let t = txt.trim();
+            if t.starts_with('{') && t.ends_with('}') {
+                if let Ok(obj) = serde_json::from_str::<CapSids>(t) {
+                    return obj;
+                }
+            } else if !t.is_empty() {
+                return CapSids {
+                    workspace: t.to_string(),
+                    readonly: make_random_cap_sid_string(),
+                };
+            }
+        }
+    }
+    CapSids {
+        workspace: make_random_cap_sid_string(),
+        readonly: make_random_cap_sid_string(),
+    }
+}