[fractal] create get_file_media_info

[Alexandre Franke <afranke src gnome org>]

commit e795177d27cf73b833fe6400386a5b148d61a611
Author: mairandomness <mairakodama gmail com>
Date:   Mon Feb 25 14:41:41 2019 -0500

    create get_file_media_info

 fractal-gtk/src/appop/message.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/fractal-gtk/src/appop/message.rs b/fractal-gtk/src/appop/message.rs
index 95f2ff18..b0f11898 100644
--- a/fractal-gtk/src/appop/message.rs
+++ b/fractal-gtk/src/appop/message.rs
@@ -276,6 +276,7 @@ impl AppOp {
                     let info = match mtype {
                         "m.image" => get_image_media_info(path_string, mime.as_ref()),
                         "m.audio" => get_audio_media_info(path_string, mime.as_ref()),
+                        "m.file" => get_file_media_info(path_string, mime.as_ref()),
                         _ => None,
                     };
 
@@ -540,3 +541,16 @@ fn get_audio_media_info(file: &str, mimetype: &str) -> Option<JsonValue> {
 
     Some(info)
 }
+
+fn get_file_media_info(file: &str, mimetype: &str) -> Option<JsonValue> {
+    let size = fs::metadata(file).ok()?.len();
+
+    let info = json!({
+        "info": {
+            "size": size,
+            "mimetype": mimetype,
+        }
+    });
+
+    Some(info)
+}