5 files changed, 104 insertions, 5 deletions

diff --git a/src/encoding/headermap.rs b/src/encoding/headermap.rs
index 313d8b5..2f9f097 100644
--- a/src/encoding/headermap.rs
+++ b/src/encoding/headermap.rs
@@ -13,11 +13,17 @@ impl HeaderMap {
         self.0.push((H::NAME.to_string(), format!("{h}")));
         self
     }
-    pub fn get<H: Header>(&self) -> Option<Result<H>> {
+    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 == H::NAME)
-            .map(|(_, v)| H::from_str(v))
+            .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 insert_raw(&mut self, key: String, value: String) {
         self.0.push((key, value))
@@ -32,3 +38,9 @@ impl Display for HeaderMap {
         Ok(())
     }
 }
+
+impl FromIterator<(String, String)> for HeaderMap {
+    fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
+        Self(Vec::from_iter(iter))
+    }
+}
diff --git a/src/encoding/headers.rs b/src/encoding/headers.rs
index d837ee5..6bffc7e 100644
--- a/src/encoding/headers.rs
+++ b/src/encoding/headers.rs
@@ -1,7 +1,10 @@
+use super::{headermap::HeaderMap, method::Method};
+use anyhow::{anyhow, bail};
 use std::{fmt::Display, str::FromStr};
 
 macro_rules! header {
     ($hname:literal, struct $name:ident($type:ty)) => {
+        #[derive(Debug)]
         pub struct $name(pub $type);
         impl Header for $name {
             const NAME: &'static str = $hname;
@@ -26,7 +29,6 @@ pub trait Header: FromStr<Err = anyhow::Error> + Display {
 
 header!("Content-Length", struct ContentLength(usize));
 header!("Call-ID", struct CallID(String));
-header!("CSeq", struct CSeq(String));
 header!("Via", struct Via(String));
 header!("Contact", struct Contact(String));
 header!("Max-Forwards", struct MaxForwards(usize));
@@ -34,3 +36,70 @@ header!("From", struct From(String));
 header!("To", struct To(String));
 header!("User-Agent", struct UserAgent(String));
 header!("Allow", struct Allow(String));
+
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+pub struct CSeq(pub u32, pub Method);
+
+impl Header for CSeq {
+    const NAME: &'static str = "CSeq";
+}
+impl Display for CSeq {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{} {}", self.0, self.1)
+    }
+}
+impl FromStr for CSeq {
+    type Err = anyhow::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (seq, method) = s.split_once(" ").ok_or(anyhow!("method missing"))?;
+        Ok(CSeq(seq.parse()?, method.parse()?))
+    }
+}
+
+#[derive(Debug)]
+pub struct WWWAuthenticate {
+    pub realm: String,
+    pub nonce: String,
+}
+impl Header for WWWAuthenticate {
+    const NAME: &'static str = "WWW-Authenticate";
+}
+impl Display for WWWAuthenticate {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Digest realm={:?}, nonce={:?}", self.realm, self.nonce)
+    }
+}
+impl FromStr for WWWAuthenticate {
+    type Err = anyhow::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        // TODO this is totally wrong
+        let kvs = s
+            .strip_prefix("Digest ")
+            .ok_or(anyhow!("type not digest"))?
+            .split(", ")
+            .map(|e| {
+                let Some((k, v)) = e.split_once("=") else {
+                    bail!("not a KV-pair")
+                };
+                Ok((
+                    k.to_string(),
+                    v.strip_prefix("\"")
+                        .ok_or(anyhow!("start quote missing"))?
+                        .strip_suffix("\"")
+                        .ok_or(anyhow!("end quote missing"))?
+                        .to_string(),
+                ))
+            })
+            .try_collect::<HeaderMap>()?;
+        Ok(WWWAuthenticate {
+            realm: kvs
+                .get_raw("realm")
+                .ok_or(anyhow!("realm missing"))?
+                .to_string(),
+            nonce: kvs
+                .get_raw("nonce")
+                .ok_or(anyhow!("nonce missing"))?
+                .to_string(),
+        })
+    }
+}
diff --git a/src/encoding/method.rs b/src/encoding/method.rs
index 5f8110a..73829b0 100644
--- a/src/encoding/method.rs
+++ b/src/encoding/method.rs
@@ -1,5 +1,7 @@
-use std::fmt::Display;
+use anyhow::bail;
+use std::{fmt::Display, str::FromStr};
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Method {
     Register,
     Invite,
@@ -21,3 +23,17 @@ impl Display for Method {
         })
     }
 }
+impl FromStr for Method {
+    type Err = anyhow::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "REGISTER" => Method::Register,
+            "INVITE" => Method::Invite,
+            "ACK" => Method::Ack,
+            "OPTION" => Method::Option,
+            "CANCEL" => Method::Cancel,
+            "BYE" => Method::Bye,
+            _ => bail!("unknown method"),
+        })
+    }
+}
diff --git a/src/encoding/request.rs b/src/encoding/request.rs
index 03b93c9..124522c 100644
--- a/src/encoding/request.rs
+++ b/src/encoding/request.rs
@@ -1,6 +1,7 @@
 use super::{headermap::HeaderMap, method::Method, uri::Uri};
 use std::fmt::Display;
 
+#[derive(Debug)]
 pub struct Request {
     pub method: Method,
     pub uri: Uri,
diff --git a/src/encoding/uri.rs b/src/encoding/uri.rs
index 2d77df2..64572ba 100644
--- a/src/encoding/uri.rs
+++ b/src/encoding/uri.rs
@@ -1,5 +1,6 @@
 use std::fmt::Display;
 
+#[derive(Debug)]
 pub struct Uri {
     pub content: String,
 }