xmpp-parsers: Convert bind to xso

parsers/src/bind.rs

@@ -4,23 +4,24 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+use xso::{AsXml, FromXml};
+
 use crate::iq::{IqResultPayload, IqSetPayload};
 use crate::ns;
 use jid::{FullJid, Jid};
-use minidom::Element;
-use std::str::FromStr;
-use xso::error::{Error, FromElementError};
 
 /// The request for resource binding, which is the process by which a client
 /// can obtain a full JID and start exchanging on the XMPP network.
 ///
 /// See <https://xmpp.org/rfcs/rfc6120.html#bind>
-#[derive(Debug, Clone, PartialEq)]
+#[derive(FromXml, AsXml, Debug, Clone, PartialEq)]
+#[xml(namespace = ns::BIND, name = "bind")]
 pub struct BindQuery {
     /// Requests this resource, the server may associate another one though.
     ///
     /// If this is None, we request no particular resource, and a random one
     /// will be affected by the server.
+    #[xml(extract(default, fields(text(type_ = String))))]
     resource: Option<String>,
 }
 
@@ -33,48 +34,14 @@ impl BindQuery {
 
 impl IqSetPayload for BindQuery {}
 
-impl TryFrom<Element> for BindQuery {
-    type Error = FromElementError;
-
-    fn try_from(elem: Element) -> Result<BindQuery, FromElementError> {
-        check_self!(elem, "bind", BIND);
-        check_no_attributes!(elem, "bind");
-
-        let mut resource = None;
-        for child in elem.children() {
-            if resource.is_some() {
-                return Err(Error::Other("Bind can only have one child.").into());
-            }
-            if child.is("resource", ns::BIND) {
-                check_no_attributes!(child, "resource");
-                check_no_children!(child, "resource");
-                resource = Some(child.text());
-            } else {
-                return Err(Error::Other("Unknown element in bind request.").into());
-            }
-        }
-
-        Ok(BindQuery { resource })
-    }
-}
-
-impl From<BindQuery> for Element {
-    fn from(bind: BindQuery) -> Element {
-        Element::builder("bind", ns::BIND)
-            .append_all(
-                bind.resource
-                    .map(|resource| Element::builder("resource", ns::BIND).append(resource)),
-            )
-            .build()
-    }
-}
-
 /// The response for resource binding, containing the client’s full JID.
 ///
 /// See <https://xmpp.org/rfcs/rfc6120.html#bind>
-#[derive(Debug, Clone, PartialEq)]
+#[derive(FromXml, AsXml, Debug, Clone, PartialEq)]
+#[xml(namespace = ns::BIND, name = "bind")]
 pub struct BindResponse {
     /// The full JID returned by the server for this client.
+    #[xml(extract(fields(text(type_ = FullJid))))]
     jid: FullJid,
 }
 
@@ -92,49 +59,11 @@ impl From<BindResponse> for Jid {
     }
 }
 
-impl TryFrom<Element> for BindResponse {
-    type Error = FromElementError;
-
-    fn try_from(elem: Element) -> Result<BindResponse, FromElementError> {
-        check_self!(elem, "bind", BIND);
-        check_no_attributes!(elem, "bind");
-
-        let mut jid = None;
-        for child in elem.children() {
-            if jid.is_some() {
-                return Err(Error::Other("Bind can only have one child.").into());
-            }
-            if child.is("jid", ns::BIND) {
-                check_no_attributes!(child, "jid");
-                check_no_children!(child, "jid");
-                jid = Some(FullJid::from_str(&child.text()).map_err(Error::text_parse_error)?);
-            } else {
-                return Err(Error::Other("Unknown element in bind response.").into());
-            }
-        }
-
-        Ok(BindResponse {
-            jid: match jid {
-                None => {
-                    return Err(Error::Other("Bind response must contain a jid element.").into())
-                }
-                Some(jid) => jid,
-            },
-        })
-    }
-}
-
-impl From<BindResponse> for Element {
-    fn from(bind: BindResponse) -> Element {
-        Element::builder("bind", ns::BIND)
-            .append(Element::builder("jid", ns::BIND).append(bind.jid))
-            .build()
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
+    use minidom::Element;
+    use xso::error::{Error, FromElementError};
 
     #[cfg(target_pointer_width = "32")]
     #[test]
@@ -188,7 +117,10 @@ mod tests {
             FromElementError::Invalid(Error::Other(string)) => string,
             _ => panic!(),
         };
-        assert_eq!(message, "Unknown attribute in resource element.");
+        assert_eq!(
+            message,
+            "Unknown attribute in extraction for field 'resource' in BindQuery element."
+        );
 
         let elem: Element = "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><resource><hello-world/>resource</resource></bind>"
             .parse()
@@ -198,6 +130,9 @@ mod tests {
             FromElementError::Invalid(Error::Other(string)) => string,
             _ => panic!(),
         };
-        assert_eq!(message, "Unknown child in resource element.");
+        assert_eq!(
+            message,
+            "Unknown child in extraction for field 'resource' in BindQuery element."
+        );
     }
 }