1 files changed, 72 insertions, 0 deletions
diff --git a/lib/src/types/payload.rs b/lib/src/types/payload.rs
new file mode 100644
index 0000000..a11b215
--- /dev/null
+++ b/lib/src/types/payload.rs
@@ -0,0 +1,72 @@
+use std::convert::TryFrom;
+
+use anyhow::Result;
+
+use crate::types::DateTime;
+
+#[derive(Debug, Eq, PartialEq, getset::Getters)]
+pub struct Payload {
+    // TODO: Make this a mime::Mime, but as this type does not impl Serialize/Deserialize, we
+    // cannot do this trivially yet
+    #[getset(get = "pub")]
+    mime: String,
+
+    #[getset(get = "pub")]
+    timestamp: DateTime,
+
+    content: ipfs::Cid,
+}
+
+impl Into<ipfs::Ipld> for Payload {
+    fn into(self) -> ipfs::Ipld {
+        let mut map = std::collections::BTreeMap::new();
+        map.insert(String::from("mime"), ipfs::Ipld::String(self.mime));
+        map.insert(String::from("timestamp"), self.timestamp.into());
+        map.insert(String::from("content"), ipfs::Ipld::Link(self.content));
+        ipfs::Ipld::Map(map)
+    }
+}
+
+impl TryFrom<ipfs::Ipld> for Payload {
+    type Error = anyhow::Error;
+
+    fn try_from(ipld: ipfs::Ipld) -> Result<Self> {
+        let missing_field = |name: &'static str| move || anyhow::anyhow!("Missing field {}", name);
+        let field_wrong_type = |name: &str, expty: &str| anyhow::bail!("Field {} has wrong type, expected {}", name, expty);
+        match ipld {
+            ipfs::Ipld::Map(map) => {
+                let mime = match map.get("mime").ok_or_else(missing_field("mime"))? {
+                    ipfs::Ipld::String(s) => s.to_owned(),
+                    _ => return field_wrong_type("mime", "String")
+                };
+
+                let timestamp = map.get("timestamp")
+                    .ok_or_else(missing_field("timestamp"))?;
+                let timestamp = DateTime::try_from(timestamp.clone())?; // TODO dont clone
+
+                let content = match map.get("content").ok_or_else(missing_field("content"))? {
+                    ipfs::Ipld::Link(cid) => cid.clone(),
+                    _ => return field_wrong_type("content", "Link")
+                };
+
+                Ok(Payload {
+                    mime,
+                    timestamp,
+                    content
+                })
+            },
+
+            _ => anyhow::bail!("Unexpected type, expected map"),
+        }
+    }
+}
+
+impl Payload {
+    pub fn new(mime: String, timestamp: DateTime, content: ipfs::Cid) -> Self {
+        Self { mime, timestamp, content: content.into() }
+    }
+
+    pub fn content(&self) -> ipfs::Cid {
+        self.content.clone()
+    }
+}