feat(path): ported content_path

src/content/mod.rs

@@ -0,0 +1 @@
+pub mod path;

src/content/path.rs

@@ -0,0 +1,38 @@
+use std::path::{PathBuf, Path};
+use ssri::Integrity;
+
+const CONTENT_VERSION: &'static str = "2";
+
+// Current format of content file path:
+//
+// sha512-BaSE64Hex= ->
+// ~/.my-cache/content-v2/sha512/ba/da/55deadbeefc0ffee
+//
+pub fn content_path(cache: &Path, sri: &Integrity) -> PathBuf {
+    let mut path = PathBuf::new();
+    let (algo, hex) = sri.to_hex();
+    path.push(cache);
+    path.push(format!("content-v{}", CONTENT_VERSION));
+    path.push(algo.to_string());
+    path.push(&hex[0..2]);
+    path.push(&hex[2..4]);
+    path.push(&hex[4..]);
+    path
+}
+
+#[cfg(test)]
+mod tests {
+    use super::content_path;
+    use ssri::{Integrity, Algorithm};
+    use std::path::Path;
+
+    #[test]
+    fn basic_test() {
+        let sri = Integrity::from(b"hello world", Algorithm::Sha256);
+        let cpath = content_path(Path::new("~/.my-cache"), &sri);
+        assert_eq!(
+            cpath.to_str().unwrap(),
+            "~/.my-cache/content-v2/sha256/b9/4d/27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
+        );
+    }
+}

src/lib.rs

@@ -0,0 +1,2 @@
+mod content;
+pub use crate::content::path;