tsk-45: Identify type of Song (#48)

Closes #45

Reviewed-on: #48
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

src/detection/song.rs

@@ -0,0 +1,90 @@
+/// Gets the file type of a Song from it's path
+pub fn file_type_from_filepath(
+    filepath: &str,
+) -> Result<crate::detection::FileType, std::io::Error> {
+    match infer::get_from_path(filepath) {
+        Ok(Some(kind)) => {
+            let mime = kind.mime_type();
+            if mime == constants::mime::FLAC {
+                Ok(crate::detection::FileType {
+                    mime: String::from(mime),
+                    file_type: String::from(constants::FLAC_TYPE),
+                })
+            } else {
+                Err(std::io::Error::other("Unsupported file type"))
+            }
+        }
+        Ok(None) => Err(std::io::Error::other("File type not determined")),
+        Err(err) => Err(err),
+    }
+}
+
+/// Gets the file type of a Song given it's data
+pub fn file_type_from_data(data: &[u8]) -> Result<crate::detection::FileType, std::io::Error> {
+    match infer::get(data) {
+        Some(kind) => {
+            let mime = kind.mime_type();
+            if mime == constants::mime::FLAC {
+                Ok(crate::detection::FileType {
+                    mime: String::from(mime),
+                    file_type: String::from(constants::FLAC_TYPE),
+                })
+            } else {
+                Err(std::io::Error::other("Unsupported file type"))
+            }
+        }
+        None => Err(std::io::Error::other("File type not determined")),
+    }
+}
+
+pub mod constants {
+    pub const FLAC_TYPE: &str = "flac";
+
+    pub mod mime {
+        pub const FLAC: &str = "audio/x-flac";
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_song_file_type() {
+        let directory = String::from(crate::test_util::util::TESTFILEDIRECTORY);
+        let filename = String::from("track01.flac");
+        let filepath = format!("{directory}/{filename}");
+
+        match super::file_type_from_filepath(&filepath) {
+            Ok(filetype) => {
+                assert_eq!(
+                    filetype.file_type,
+                    crate::detection::song::constants::FLAC_TYPE,
+                    "Types do not match"
+                )
+            }
+            Err(err) => {
+                assert!(false, "Error: {err:?}")
+            }
+        }
+    }
+
+    #[test]
+    fn test_song_file_type_from_data() {
+        let directory = String::from(crate::test_util::util::TESTFILEDIRECTORY);
+        let filename = String::from("track01.flac");
+        let filepath = format!("{directory}/{filename}");
+        let data = crate::test_util::util::get_data_from_file(&filepath).unwrap();
+
+        match super::file_type_from_data(&data) {
+            Ok(filetype) => {
+                assert_eq!(
+                    filetype.file_type,
+                    crate::detection::song::constants::FLAC_TYPE,
+                    "Types do not match"
+                )
+            }
+            Err(err) => {
+                assert!(false, "Error: {err:?}")
+            }
+        }
+    }
+}