Add a Delayed Delivery parser.

src/delay.rs

@@ -0,0 +1,66 @@
+use minidom::Element;
+
+use error::Error;
+
+use ns;
+
+#[derive(Debug, Clone)]
+pub struct Delay {
+    pub from: Option<String>,
+    pub stamp: String,
+    pub data: Option<String>,
+}
+
+pub fn parse_delay(root: &Element) -> Result<Delay, Error> {
+    if !root.is("delay", ns::DELAY) {
+        return Err(Error::ParseError("This is not a delay element."));
+    }
+    for _ in root.children() {
+        return Err(Error::ParseError("Unknown child in delay element."));
+    }
+    let from = root.attr("from").and_then(|value| value.parse().ok());
+    let stamp = root.attr("stamp").ok_or(Error::ParseError("Mandatory argument 'stamp' not present in delay element."))?.to_owned();
+    Ok(Delay {
+        from: from,
+        stamp: stamp,
+        data: None,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use minidom::Element;
+    use error::Error;
+    use delay;
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<delay xmlns='urn:xmpp:delay' from='capulet.com' stamp='2002-09-10T23:08:25Z'/>".parse().unwrap();
+        let delay = delay::parse_delay(&elem).unwrap();
+        assert_eq!(delay.from, Some(String::from("capulet.com")));
+        assert_eq!(delay.stamp, "2002-09-10T23:08:25Z");
+        assert_eq!(delay.data, None);
+    }
+
+    #[test]
+    fn test_unknown() {
+        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
+        let error = delay::parse_delay(&elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "This is not a delay element.");
+    }
+
+    #[test]
+    fn test_invalid_child() {
+        let elem: Element = "<delay xmlns='urn:xmpp:delay'><coucou/></delay>".parse().unwrap();
+        let error = delay::parse_delay(&elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "Unknown child in delay element.");
+    }
+}