feat: add manifest skelet

Cargo.toml

@@ -10,3 +10,15 @@ keywords = ["wasm", "sandbox", "capabilities", "plugins", "traces"]
 categories = ["cryptography::randomness", "encoding"]
 
 [dependencies]
+color-eyre = "0.6"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+[dev-dependencies]
+claims = "0.8"
+
+[lints.clippy]
+pedantic = "warn"
+nursery = "warn"
+unwrap_used = "warn"
+expect_used = "warn"

examples/manifest.json

@@ -0,0 +1,13 @@
+{
+  "plugin": "formatter-v1",
+  "version": "0.1",
+  "capabilities": {
+    "fs": {
+      "read": [
+        "./workspace/*"
+      ],
+      "write": []
+    }
+  },
+  "issued_by": "dev-team"
+}

src/lib.rs

@@ -1,14 +1,55 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
+use std::fs::read_to_string;
+
+use color_eyre::eyre::Result;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct FsCapability {
+    pub read: Vec<String>,  // Glob patter for read
+    pub write: Vec<String>, // Stub for now
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Capability {
+    Fs(FsCapability),
+    // TODO: add Net, Cpu
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Capabilities {
+    pub fs: Option<FsCapability>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct CapabilityManifest {
+    pub plugin: String,
+    pub version: String,
+    pub capabilities: Capabilities,
+    pub issued_by: String,
+    // TODO: add signature
+}
+
+pub fn load_manifest(path: &str) -> Result<CapabilityManifest> {
+    let json_str = read_to_string(path)?;
+    let manifest = serde_json::from_str(&json_str)?;
+    Ok(manifest)
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
+    use claims::assert_some;
 
     #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
+    fn manifest_loader() {
+        let manifest = load_manifest("examples/manifest.json").expect("Load failed");
+        assert_eq!(manifest.plugin, "formatter-v1");
+        assert_eq!(manifest.version, "0.1");
+        assert_eq!(manifest.issued_by, "dev-team");
+
+        let caps = manifest.capabilities;
+        let fs_cap = assert_some!(caps.fs);
+        assert_eq!(fs_cap.read, vec!["./workspace/*"]);
+        assert!(fs_cap.write.is_empty());
     }
 }