Merge pull request http-rs#389 from halvko/f-change-mime-negotiation

Change mime negotiation

Author: yoshuawuyts

src/content/accept.rs

@@ -129,8 +129,8 @@ impl Accept {
 
         // Try and find the first encoding that matches.
         for accept in &self.entries {
-            if available.contains(accept) {
-                return Ok(accept.media_type.clone().into());
+            if let Some(accept) = available.iter().find(|m| m.subset_eq(accept.media_type())) {
+                return Ok(accept.clone().into());
             }
         }
 
@@ -420,4 +420,22 @@ mod test {
         assert_eq!(accept.negotiate(&[mime::XML])?, mime::XML);
         Ok(())
     }
+
+    #[test]
+    fn negotiate_missing_encoding() -> crate::Result<()> {
+        let mime_html = "text/html".parse::<Mime>()?;
+
+        let mut browser_accept = Accept::new();
+        browser_accept.push(MediaTypeProposal::new(mime_html, None)?);
+
+        let acceptable = &[mime::HTML];
+
+        let content_type = browser_accept.negotiate(acceptable);
+
+        assert!(
+            content_type.is_ok(),
+            "server is expected to return HTML content"
+        );
+        Ok(())
+    }
 }

src/mime/mod.rs

@@ -103,6 +103,45 @@ impl Mime {
             .position(|(k, _)| k == &name)
             .map(|pos| self.params.remove(pos).1)
     }
+
+    /// Check if this mime is a subtype of another mime.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// // All mime types are subsets of */*
+    /// use http_types::mime::Mime;
+    /// use std::str::FromStr;
+    ///
+    /// assert!(Mime::from_str("text/css").unwrap().subset_eq(&Mime::from_str("*/*").unwrap()));
+    ///
+    /// // A mime type is subset of itself
+    /// assert!(Mime::from_str("text/css").unwrap().subset_eq(&Mime::from_str("text/css").unwrap()));
+    ///
+    /// // A mime type which is otherwise a subset with extra parameters is a subset of a mime type without those parameters
+    /// assert!(Mime::from_str("text/css;encoding=utf-8").unwrap().subset_eq(&Mime::from_str("text/css").unwrap()));
+    ///
+    /// // A mime type more general than another mime type is not a subset
+    /// assert!(!Mime::from_str("*/css;encoding=utf-8").unwrap().subset_eq(&Mime::from_str("text/css").unwrap()));
+    /// ```
+    pub fn subset_eq(&self, other: &Mime) -> bool {
+        if other.basetype() != "*" && self.basetype() != other.basetype() {
+            return false;
+        }
+        if other.subtype() != "*" && self.subtype() != other.subtype() {
+            return false;
+        }
+        for (name, value) in other.params.iter() {
+            if !self
+                .param(name.clone())
+                .map(|v| v == value)
+                .unwrap_or(false)
+            {
+                return false;
+            }
+        }
+        true
+    }
 }
 
 impl Display for Mime {