Add Payload type

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/backend/mime.rs b/src/backend/mime.rs
new file mode 100644
index 0000000..d65761e
--- /dev/null
+++ b/src/backend/mime.rs
@@ -0,0 +1,22 @@
+use anyhow::Error;
+
+#[derive(Debug, Eq, PartialEq)]
+pub struct MimeType(mime::Mime);
+
+impl<C: libipld::codec::Codec> libipld::codec::Encode<C> for MimeType {
+    fn encode<W: std::io::Write>(&self, _c: C, w: &mut W) -> libipld::error::Result<()> {
+        w.write_all(self.0.essence_str().as_bytes()).map_err(Error::from)
+    }
+}
+
+impl libipld::codec::Decode<libipld_cbor::DagCborCodec> for MimeType {
+    fn decode<R: std::io::Read + std::io::Seek>(c: libipld_cbor::DagCborCodec, r: &mut R) -> libipld::error::Result<Self> {
+        use std::str::FromStr;
+
+        String::decode(c, r)
+            .map_err(Error::from)
+            .and_then(|s| mime::Mime::from_str(&s).map_err(Error::from))
+            .map(MimeType)
+    }
+}
+