interpreter: new read_actions_component

Rejects stanza without an @to, and automatically adds @from.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

src/interpreter.rs

@@ -15,8 +15,8 @@
 
 use crate::element::{ScanElement, DEFAULT_NS, SCANSION_NS};
 use crate::parsers::{parse_spec, Token};
-use crate::types::{Action, Context, Entity, Spec};
-use jid::Jid;
+use crate::types::{Action, Client, Context, Entity, Spec};
+use jid::{BareJid, Jid};
 use minidom::{Element, Error as MinidomError};
 use rand::{thread_rng, Rng};
 use std::collections::BTreeMap;
@@ -115,6 +115,73 @@ pub fn read_actions(spec: Spec, context: &Context) -> Result<InOutStanza, Minido
 	Ok(inout)
 }
 
+/// Reads Actions from Spec and converts that to InOutStanza. Also ensures @to and @from attributes
+/// are set. Rejects stanza without an @to, and automatically adds @from.
+pub fn read_actions_component(spec: Spec, context: &Context) -> Result<InOutStanza, MinidomError> {
+	let mut inout = InOutStanza::new();
+	for action in spec.actions {
+		match action {
+			Action::Receive(name, s) => {
+				let _jid = context
+					.get(&name)
+					.expect(format!("Name '{}' not found in clients", name).as_str());
+
+				let prefixes: BTreeMap<Option<String>, String> = {
+					let mut tmp = BTreeMap::new();
+					tmp.insert(None, String::from(DEFAULT_NS));
+					tmp.insert(Some(String::from("scansion")), String::from(SCANSION_NS));
+					tmp
+				};
+				let elem: Element =
+					Element::from_reader_with_prefixes(s.as_ref(), prefixes).unwrap();
+				inout.receives(ScanElement::new(elem).apply_context(&context));
+			}
+			Action::Send(name, s) => {
+				let client = context
+					.get(&name)
+					.expect(format!("Name '{}' not found in clients", name).as_str());
+
+				let jid: BareJid = match client {
+					Entity::Client(Client {
+						jid: Jid::Full(full),
+						..
+					}) => BareJid::from(full.clone()),
+					Entity::Client(Client {
+						jid: Jid::Bare(bare),
+						..
+					}) => bare.clone(),
+				};
+
+				let prefixes: BTreeMap<Option<String>, String> = {
+					let mut tmp = BTreeMap::new();
+					tmp.insert(None, String::from(DEFAULT_NS));
+					tmp.insert(Some(String::from("scansion")), String::from(SCANSION_NS));
+					tmp
+				};
+				let mut elem: Element =
+					Element::from_reader_with_prefixes(s.as_ref(), prefixes).unwrap();
+
+				// Ensure stanza have to/from parameters. We may be able to infer where the stanza
+				// comes from but we need them to be addressed to the component explicitely.
+				assert_ne!(
+					elem.attr("to"),
+					None,
+					"Stanza sent by '{}' should possess a 'to' parameter",
+					name,
+				);
+				if elem.attr("from").is_none() {
+					elem.set_attr("from", Jid::Bare(jid));
+				}
+
+				inout.sends(ScanElement::new(elem).apply_context(&context));
+			}
+			_ => (),
+		}
+	}
+
+	Ok(inout)
+}
+
 pub fn read_spec<'a, 'b>(buf: &str) -> Result<Spec, Token> {
 	let mut spec = parse_spec(buf)?;
 	spec.context = bind_context(spec.context.clone());

src/lib.rs

@@ -12,6 +12,6 @@ pub mod parsers;
 pub mod types;
 
 pub use element::ScanElement;
-pub use interpreter::{read_actions, read_spec};
+pub use interpreter::{read_actions, read_actions_component, read_spec};
 pub use parsers::parse_spec;
 pub use types::{Action, Client, Context, Entity, Metadata, Name, Spec};