allow setting Browsers as default opener in Linux

src/linux/linux_utils.rs

@@ -1,6 +1,7 @@
 use std::collections::{BTreeMap, HashSet};
 use std::fs;
 use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
 use std::slice::Split;
 
 use druid::image;
@@ -429,3 +430,53 @@ pub fn linux_get_unsandboxed_home_dir() -> PathBuf {
     // TODO: escape sandbox if in snap/flatpak
     return dirs::home_dir().unwrap();
 }
+
+// returns true if it was already default web browser (then nothing was done)
+pub fn set_default_web_browser() -> bool {
+    if is_default_web_browser() {
+        return true;
+    }
+
+    let desktop_file_name = format!("{}.desktop", XDG_NAME);
+
+    let result = Command::new("xdg-mime")
+        .arg("default")
+        .arg(desktop_file_name.as_str())
+        .arg("https http")
+        .status();
+
+    if result.is_err() {
+        warn!("Could not set Browsers as default app");
+    }
+
+    return false;
+}
+
+pub fn is_default_web_browser() -> bool {
+    let desktop_file_name = format!("{}.desktop", XDG_NAME);
+
+    let https_default_app = query_default_app("https").unwrap_or("".to_string());
+    let http_default_app = query_default_app("http").unwrap_or("".to_string());
+
+    return https_default_app == desktop_file_name && http_default_app == desktop_file_name;
+}
+
+fn query_default_app(scheme: &str) -> Option<String> {
+    let result = Command::new("xdg-mime")
+        .arg("query")
+        .arg("default")
+        .arg(scheme)
+        .stdout(Stdio::piped())
+        .output();
+
+    if result.is_err() {
+        warn!("Could not query default app for scheme {}", scheme);
+        return None;
+    }
+
+    let output = result.unwrap();
+
+    // extract the raw bytes that we captured and interpret them as a string
+    let default_app = String::from_utf8(output.stdout).unwrap();
+    return Some(default_app);
+}

src/utils.rs

@@ -18,22 +18,32 @@ use crate::macos::macos_utils;
 use crate::windows::windows_utils;
 use crate::{paths, InstalledBrowser, SupportedAppRepository};
 
+#[cfg(target_os = "linux")]
+pub fn is_default_web_browser() -> bool {
+    return linux_utils::is_default_web_browser();
+}
+
 #[cfg(target_os = "macos")]
 pub fn is_default_web_browser() -> bool {
     return macos_utils::is_default_web_browser();
 }
 
-#[cfg(not(target_os = "macos"))]
+#[cfg(target_os = "windows")]
 pub fn is_default_web_browser() -> bool {
     return true;
 }
 
+#[cfg(target_os = "linux")]
+pub fn set_as_default_web_browser() -> bool {
+    return linux_utils::set_default_web_browser();
+}
+
 #[cfg(target_os = "macos")]
 pub fn set_as_default_web_browser() -> bool {
     return macos_utils::set_default_web_browser();
 }
 
-#[cfg(not(target_os = "macos"))]
+#[cfg(target_os = "windows")]
 pub fn set_as_default_web_browser() -> bool {
     return true;
 }