1 files changed, 53 insertions, 0 deletions
diff --git a/sip/src/encoding/response.rs b/sip/src/encoding/response.rs
new file mode 100644
index 0000000..0b7996c
--- /dev/null
+++ b/sip/src/encoding/response.rs
@@ -0,0 +1,53 @@
+use super::{headermap::HeaderMap, status::Status};
+use anyhow::{anyhow, bail, Context};
+use std::{fmt::Display, str::FromStr};
+
+#[derive(Debug, Clone)]
+pub struct Response {
+    pub status: Status,
+    pub headers: HeaderMap,
+    pub body: String,
+}
+
+impl FromStr for Response {
+    type Err = anyhow::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut lines = s.lines();
+        let statusline = lines.next().ok_or(anyhow!("status line missing"))?;
+        let (sipver, rest) = statusline
+            .split_once(" ")
+            .ok_or(anyhow!("status line malformed"))?;
+        let (code, _status_str) = rest
+            .split_once(" ")
+            .ok_or(anyhow!("status line malformed"))?;
+        let code = u16::from_str(code).context("status code")?;
+
+        let Some(ver) = sipver.strip_prefix("SIP/") else {
+            bail!("sip version malformed");
+        };
+        if ver != "2.0" {
+            bail!("sip version {ver:?} is not supported");
+        }
+
+        let headers = HeaderMap::parse(&mut lines)?;
+
+        let status = Status::from_code(code);
+        Ok(Self {
+            status,
+            headers,
+            body: String::new(),
+        })
+    }
+}
+impl Display for Response {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let Self {
+            status,
+            headers,
+            body,
+        } = self;
+        write!(f, "SIP/2.0 {} {status:?}\r\n", status.to_code())?;
+        write!(f, "{headers}\r\n{body}")?;
+        Ok(())
+    }
+}