[fractal] change thumb path to random file name in temp

[Christopher Davis <christopherdavis src gnome org>]

commit d71da4afec7bcacf07c68f7c519cb9219979741f
Author: mairandomness <mairakodama gmail com>
Date:   Mon Feb 18 20:11:47 2019 -0500

    change thumb path to random file name in temp

 fractal-gtk/src/appop/message.rs       | 13 +++++++++++--
 fractal-matrix-api/src/backend/room.rs |  7 +++----
 2 files changed, 14 insertions(+), 6 deletions(-)
---
diff --git a/fractal-gtk/src/appop/message.rs b/fractal-gtk/src/appop/message.rs
index 3591ec55..95f2ff18 100644
--- a/fractal-gtk/src/appop/message.rs
+++ b/fractal-gtk/src/appop/message.rs
@@ -8,8 +8,10 @@ use gtk;
 use gtk::prelude::*;
 use lazy_static::lazy_static;
 use log::error;
+use rand::Rng;
 use serde_json::json;
 use serde_json::Value as JsonValue;
+use std::env::temp_dir;
 use std::fs;
 use std::path::PathBuf;
 
@@ -494,11 +496,18 @@ fn get_image_media_info(file: &str, mimetype: &str) -> Option<JsonValue> {
 
     // make thumbnail max 800x600
     let thumb = Pixbuf::new_from_file_at_scale(&file, 800, 600, true).ok()?;
-    thumb.savev("/tmp/fractal_thumb.png", "png", &[]).ok()?;
+    let mut rng = rand::thread_rng();
+    let x: u64 = rng.gen_range(1, 9223372036854775807);
+    let thumb_path = format!(
+        "{}/fractal_{}.png",
+        temp_dir().to_str().unwrap_or_default(),
+        x.to_string()
+    );
+    thumb.savev(&thumb_path, "png", &[]).ok()?;
 
     let info = json!({
         "info": {
-            "thumbnail_url": "",
+            "thumbnail_url": thumb_path,
             "thumbnail_info": {
                 "w": thumb.get_width(),
                 "h": thumb.get_height(),
diff --git a/fractal-matrix-api/src/backend/room.rs b/fractal-matrix-api/src/backend/room.rs
index 517b9548..de13b9b6 100644
--- a/fractal-matrix-api/src/backend/room.rs
+++ b/fractal-matrix-api/src/backend/room.rs
@@ -465,7 +465,9 @@ pub fn set_room_avatar(bk: &Backend, roomid: &str, avatar: &str) -> Result<(), E
 
 pub fn attach_file(bk: &Backend, mut msg: Message) -> Result<(), Error> {
     let fname = msg.url.clone().unwrap_or_default();
-    let thumb = msg.thumb.clone().unwrap_or_default();
+    let mut extra_content: ExtraContent =
+        serde_json::from_value(msg.clone().extra_content.unwrap()).unwrap();
+    let thumb = extra_content.info.thumbnail_url.clone().unwrap_or_default();
 
     let tx = bk.tx.clone();
     let itx = bk.internal_tx.clone();
@@ -484,9 +486,6 @@ pub fn attach_file(bk: &Backend, mut msg: Message) -> Result<(), Error> {
                 }
                 Ok(thumb_uri) => {
                     msg.thumb = Some(thumb_uri.to_string());
-
-                    let mut extra_content: ExtraContent =
-                        serde_json::from_value(msg.extra_content.unwrap()).unwrap();
                     extra_content.info.thumbnail_url = Some(thumb_uri);
                     msg.extra_content = Some(serde_json::to_value(&extra_content).unwrap());
                 }