1 files changed, 60 insertions, 0 deletions
diff --git a/sip/src/encoding/headermap.rs b/sip/src/encoding/headermap.rs
new file mode 100644
index 0000000..01e1962
--- /dev/null
+++ b/sip/src/encoding/headermap.rs
@@ -0,0 +1,60 @@
+use super::headers::Header;
+use anyhow::{anyhow, Result};
+use std::fmt::Display;
+
+#[derive(Debug, Clone)]
+pub struct HeaderMap(pub Vec<(String, String)>);
+
+impl HeaderMap {
+    pub fn new() -> Self {
+        Self(vec![])
+    }
+    pub fn add<H: Header>(mut self, h: H) -> Self {
+        self.0.push((H::NAME.to_string(), format!("{h}")));
+        self
+    }
+    pub fn insert<H: Header>(&mut self, h: H) {
+        self.0.push((H::NAME.to_string(), format!("{h}")));
+    }
+    pub fn get_raw(&self, name: &str) -> Option<&str> {
+        self.0
+            .iter()
+            .find(|(k, _)| k.eq_ignore_ascii_case(name))
+            .map(|(_, v)| v.as_str())
+    }
+    pub fn get<H: Header>(&self) -> Option<Result<H>> {
+        self.get_raw(H::NAME).map(H::from_str)
+    }
+    pub fn get_res<H: Header>(&self) -> Result<H> {
+        self.get().ok_or(anyhow!("{} header missing", H::NAME))?
+    }
+    pub fn insert_raw(&mut self, key: String, value: String) {
+        self.0.push((key, value))
+    }
+}
+
+impl Display for HeaderMap {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        for (k, v) in &self.0 {
+            write!(f, "{k}: {v}\r\n")?;
+        }
+        Ok(())
+    }
+}
+impl HeaderMap {
+    pub fn parse<'a>(lines: &mut impl Iterator<Item = &'a str>) -> Result<Self> {
+        let mut headers = HeaderMap::new();
+        for line in lines {
+            // TODO multiline values
+            let (key, value) = line.split_once(":").ok_or(anyhow!("header malformed"))?;
+            headers.insert_raw(key.trim().to_string(), value.trim().to_string())
+        }
+        Ok(headers)
+    }
+}
+
+impl FromIterator<(String, String)> for HeaderMap {
+    fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
+        Self(Vec::from_iter(iter))
+    }
+}