Use a proper http::HeaderName for the password header

It is a non-breaking change but still use the same name in both code and
README.md for consistency.

Author: matze

README.md

@@ -176,7 +176,7 @@ To retrieve the raw content, make a GET request on the `/raw/:id` route. If you
 use a client that is able to handle cookies you can delete the paste once again
 using the cookie in the `Set-Cookie` header set during redirect after creation.
 
-In case the paste was encrypted, pass the password via the `Wastebin-Password`
+In case the paste was encrypted, pass the password via the `wastebin-password`
 header.
 
 

src/handlers/extract.rs

@@ -4,6 +4,10 @@ use serde::Deserialize;
 
 pub struct Password(pub crypto::Password);
 
+/// Password header to encrypt a paste.
+pub const PASSWORD_HEADER_NAME: http::HeaderName =
+    http::HeaderName::from_static("wastebin-password");
+
 #[axum::async_trait]
 impl<S> FromRequest<S> for Password
 where
@@ -19,7 +23,7 @@ where
 
         if let Some(password) = req
             .headers()
-            .get("Wastebin-Password")
+            .get(PASSWORD_HEADER_NAME)
             .and_then(|header| header.to_str().ok())
         {
             return Ok(Password(password.as_bytes().to_vec().into()));

src/handlers/insert/api.rs

@@ -59,6 +59,7 @@ pub async fn insert(
 #[cfg(test)]
 mod tests {
     use crate::db::write::Entry;
+    use crate::handlers::extract::PASSWORD_HEADER_NAME;
     use crate::test_helpers::Client;
     use reqwest::StatusCode;
 
@@ -113,7 +114,7 @@ mod tests {
 
         let res = client
             .get(&format!("/raw{}", payload.path))
-            .header("Wastebin-Password", password)
+            .header(PASSWORD_HEADER_NAME, password)
             .send()
             .await?;