Handle invalid authority.

Author: o0Ignition0o

src/parser.rs

@@ -70,6 +70,7 @@ macro_rules! simple_enum_error {
 
 simple_enum_error! {
     EmptyHost => "empty host",
+    InvalidAuthority => "invalid authority",
     IdnaError => "invalid international domain name",
     InvalidPort => "invalid port number",
     InvalidIpv4Address => "invalid IPv4 address",
@@ -872,7 +873,19 @@ impl<'a> Parser<'a> {
         }
         let (mut userinfo_char_count, remaining) = match last_at {
             None => return Ok((to_u32(self.serialization.len())?, input)),
-            Some((0, remaining)) => return Ok((to_u32(self.serialization.len())?, remaining)),
+            Some((0, remaining)) => {
+                // Otherwise, if one of the following is true
+                // c is the EOF code point, U+002F (/), U+003F (?), or U+0023 (#)
+                // url is special and c is U+005C (\)
+                // If @ flag is set and buffer is the empty string, validation error, return failure.
+                if let (Some(c), _) = remaining.split_first() {
+                    if c == '/' || c == '?' || c == '#'
+                    || scheme_type.is_special() && c == '\\' {
+                        return Err(ParseError::InvalidAuthority);
+                    }
+                }
+                return Ok((to_u32(self.serialization.len())?, remaining));
+            }
             Some(x) => x,
         };