2 files changed, 198 insertions, 0 deletions
diff --git a/src/jid/mod.rs b/src/jid/mod.rs
new file mode 100644
index 0000000..c6c157f
--- /dev/null
+++ b/src/jid/mod.rs
@@ -0,0 +1,182 @@
+use std::{
+    net::{Ipv4Addr, Ipv6Addr},
+    str::FromStr,
+};
+
+#[derive(PartialEq, Debug)]
+struct JID {
+    // TODO: validate localpart (length, char]
+    localpart: Option<String>,
+    domainpart: Domainpart,
+    resourcepart: Option<String>,
+}
+
+#[derive(PartialEq, Debug)]
+enum Domainpart {
+    IPLiteral(Ipv6Addr),
+    IPv4Address(Ipv4Addr),
+    // TODO: domain name type, not string
+    IFQDN(String),
+}
+
+impl FromStr for Domainpart {
+    type Err = DomainpartParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.parse::<Ipv6Addr>() {
+            Ok(ip) => Ok(Domainpart::IPLiteral(ip)),
+            Err(_) => match s.parse::<Ipv4Addr>() {
+                Ok(ip) => Ok(Domainpart::IPv4Address(ip)),
+                Err(_) => Ok(Domainpart::IFQDN(s.to_owned())),
+            },
+        }
+    }
+}
+
+impl TryFrom<String> for Domainpart {
+    type Error = DomainpartParseError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        value.parse()
+    }
+}
+
+#[derive(Debug)]
+enum DomainpartParseError {}
+
+#[derive(Debug)]
+enum JIDParseError {
+    Empty,
+    Domainpart(DomainpartParseError),
+    Malformed,
+}
+
+impl JID {
+    fn new(localpart: Option<String>, domainpart: String, resourcepart: Option<String>) -> Self {
+        Self {
+            localpart,
+            domainpart: domainpart.parse().unwrap(),
+            resourcepart,
+        }
+    }
+
+    fn validate(&self) -> bool {
+        todo!()
+    }
+}
+
+impl FromStr for JID {
+    type Err = JIDParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let split: Vec<&str> = s.split('@').collect();
+        match split.len() {
+            0 => Err(JIDParseError::Empty),
+            1 => {
+                let split: Vec<&str> = split[0].split('/').collect();
+                match split.len() {
+                    1 => Ok(JID::new(None, split[0].to_string(), None)),
+                    2 => Ok(JID::new(
+                        None,
+                        split[0].to_string(),
+                        Some(split[1].to_string()),
+                    )),
+                    _ => Err(JIDParseError::Malformed),
+                }
+            }
+            2 => {
+                let split2: Vec<&str> = split[1].split('/').collect();
+                match split2.len() {
+                    1 => Ok(JID::new(
+                        Some(split[0].to_string()),
+                        split2[0].to_string(),
+                        None,
+                    )),
+                    2 => Ok(JID::new(
+                        Some(split[0].to_string()),
+                        split2[0].to_string(),
+                        Some(split2[1].to_string()),
+                    )),
+                    _ => Err(JIDParseError::Malformed),
+                }
+            }
+            _ => Err(JIDParseError::Malformed),
+        }
+    }
+}
+
+impl TryFrom<String> for JID {
+    type Error = JIDParseError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        value.parse()
+    }
+}
+
+impl std::fmt::Display for JID {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}{}{}",
+            self.localpart.clone().map(|l| l + "@").unwrap_or_default(),
+            match &self.domainpart {
+                Domainpart::IPLiteral(addr) => addr.to_string(),
+                Domainpart::IPv4Address(addr) => addr.to_string(),
+                Domainpart::IFQDN(domain) => domain.to_owned(),
+            },
+            self.resourcepart
+                .clone()
+                .map(|r| "/".to_owned() + &r)
+                .unwrap_or_default()
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn jid_to_string() {
+        assert_eq!(
+            JID::new(Some("cel".into()), "blos.sm".into(), None).to_string(),
+            "cel@blos.sm".to_owned()
+        );
+    }
+
+    #[test]
+    fn parse_full_jid() {
+        assert_eq!(
+            "cel@blos.sm/greenhouse".parse::<JID>().unwrap(),
+            JID::new(
+                Some("cel".into()),
+                "blos.sm".into(),
+                Some("greenhouse".into())
+            )
+        )
+    }
+
+    #[test]
+    fn parse_bare_jid() {
+        assert_eq!(
+            "cel@blos.sm".parse::<JID>().unwrap(),
+            JID::new(Some("cel".into()), "blos.sm".into(), None)
+        )
+    }
+
+    #[test]
+    fn parse_domain_jid() {
+        assert_eq!(
+            "component.blos.sm".parse::<JID>().unwrap(),
+            JID::new(None, "component.blos.sm".into(), None)
+        )
+    }
+
+    #[test]
+    fn parse_full_domain_jid() {
+        assert_eq!(
+            "component.blos.sm/bot".parse::<JID>().unwrap(),
+            JID::new(None, "component.blos.sm".into(), Some("bot".into()))
+        )
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..b2ce0b2
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,16 @@
+mod jid;
+
+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}