feat(paste): guess the extension if it is not present

Cargo.lock

@@ -926,6 +926,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "infer"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea70330449622910e0edebab230734569516269fb32342fb0a8956340fa48c6c"
+
 [[package]]
 name = "instant"
 version = "0.1.10"
@@ -1241,6 +1247,7 @@ dependencies = [
  "dotenv",
  "env_logger",
  "futures-util",
+ "infer",
  "log",
  "petname",
  "rand 0.8.4",

Cargo.toml

@@ -22,6 +22,10 @@ dotenv = "0.15.0"
 version = "4.0.12"
 features = ["serde"]
 
+[dependencies.infer]
+version = "0.5.0"
+default-features = false
+
 [dev-dependencies]
 actix-rt = "2.2.0"
 

src/file.rs

@@ -52,7 +52,11 @@ pub fn save(mut file_name: &str, bytes: &[u8], config: &Config) -> IoResult<Stri
                         .collect::<String>(),
                 );
             }
-            path.set_extension(&config.paste.default_extension);
+            path.set_extension(
+                infer::get(bytes)
+                    .map(|t| t.extension())
+                    .unwrap_or(&config.paste.default_extension),
+            );
         }
     }
     let mut buffer = File::create(&path)?;