From 1af06fdf6d90c29d2bc4997efc3e0fa92779c963 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Sat, 29 Jul 2017 11:45:45 +0100
Subject: [PATCH] Add an iq version parser (XEP-0092).

---
 src/lib.rs     |  3 ++
 src/ns.rs      |  3 ++
 src/version.rs | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 src/version.rs

diff --git a/src/lib.rs b/src/lib.rs
index f881082..cc9a8c3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -207,6 +207,9 @@ pub mod ibr;
 /// XEP-0085: Chat State Notifications
 pub mod chatstates;
 
+/// XEP-0092: Software Version
+pub mod version;
+
 /// XEP-0115: Entity Capabilities
 pub mod caps;
 
diff --git a/src/ns.rs b/src/ns.rs
index 5df077e..22e5f15 100644
--- a/src/ns.rs
+++ b/src/ns.rs
@@ -47,6 +47,9 @@ pub const REGISTER: &str = "jabber:iq:register";
 /// XEP-0085: Chat State Notifications
 pub const CHATSTATES: &str = "http://jabber.org/protocol/chatstates";
 
+/// XEP-0092: Software Version
+pub const VERSION: &str = "jabber:iq:version";
+
 /// XEP-0114: Jabber Component Protocol
 pub const COMPONENT_ACCEPT: &str = "jabber:component:accept";
 
diff --git a/src/version.rs b/src/version.rs
new file mode 100644
index 0000000..5e7f0ab
--- /dev/null
+++ b/src/version.rs
@@ -0,0 +1,94 @@
+// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// 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 try_from::TryFrom;
+use minidom::Element;
+use error::Error;
+use ns;
+
+#[derive(Debug, Clone)]
+pub struct Version {
+    pub name: String,
+    pub version: String,
+    pub os: Option<String>,
+}
+
+impl TryFrom<Element> for Version {
+    type Err = Error;
+
+    fn try_from(elem: Element) -> Result<Version, Error> {
+        if !elem.is("query", ns::VERSION) {
+            return Err(Error::ParseError("This is not a version element."));
+        }
+        for _ in elem.attrs() {
+            return Err(Error::ParseError("Unknown child in version element."));
+        }
+        let mut name = None;
+        let mut version = None;
+        let mut os = None;
+        for child in elem.children() {
+            if child.is("name", ns::VERSION) {
+                if name.is_some() {
+                    return Err(Error::ParseError("More than one name in version element."));
+                }
+                name = Some(child.text());
+            } else if child.is("version", ns::VERSION) {
+                if version.is_some() {
+                    return Err(Error::ParseError("More than one version in version element."));
+                }
+                version = Some(child.text());
+            } else if child.is("os", ns::VERSION) {
+                if os.is_some() {
+                    return Err(Error::ParseError("More than one os in version element."));
+                }
+                os = Some(child.text());
+            } else {
+                return Err(Error::ParseError("Unknown child in version element."));
+            }
+        }
+        let name = name.unwrap();
+        let version = version.unwrap();
+        Ok(Version {
+            name,
+            version,
+            os,
+        })
+    }
+}
+
+impl From<Version> for Element {
+    fn from(version: Version) -> Element {
+        Element::builder("query")
+                .ns(ns::VERSION)
+                .append(Element::builder("name")
+                                .ns(ns::VERSION)
+                                .append(version.name)
+                                .build())
+                .append(Element::builder("version")
+                                .ns(ns::VERSION)
+                                .append(version.version)
+                                .build())
+                .append(Element::builder("os")
+                                .ns(ns::VERSION)
+                                .append(version.os)
+                                .build())
+                .build()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<query xmlns='jabber:iq:version'><name>xmpp-rs</name><version>0.3.0</version></query>".parse().unwrap();
+        let version = Version::try_from(elem).unwrap();
+        assert_eq!(version.name, String::from("xmpp-rs"));
+        assert_eq!(version.version, String::from("0.3.0"));
+        assert_eq!(version.os, None);
+    }
+}