feat: support specify the browser to use

Related: #405, #407, #397

crates/gpapi/src/process/browser_authenticator.rs

@@ -1,20 +1,31 @@
-use std::{env::temp_dir, fs, io::Write, os::unix::fs::PermissionsExt};
+use std::{borrow::Cow, env::temp_dir, fs, io::Write, os::unix::fs::PermissionsExt};
 
 use anyhow::bail;
-use log::warn;
+use log::{info, warn};
 
 pub struct BrowserAuthenticator<'a> {
   auth_request: &'a str,
+  browser: Option<&'a str>,
 }
 
 impl BrowserAuthenticator<'_> {
   pub fn new(auth_request: &str) -> BrowserAuthenticator {
-    BrowserAuthenticator { auth_request }
+    BrowserAuthenticator {
+      auth_request,
+      browser: None,
+    }
+  }
+
+  pub fn new_with_browser<'a>(auth_request: &'a str, browser: &'a str) -> BrowserAuthenticator<'a> {
+    BrowserAuthenticator {
+      auth_request,
+      browser: Some(browser),
+    }
   }
 
   pub fn authenticate(&self) -> anyhow::Result<()> {
-    if self.auth_request.starts_with("http") {
-      open::that_detached(self.auth_request)?;
+    let path = if self.auth_request.starts_with("http") {
+      Cow::Borrowed(self.auth_request)
     } else {
       let html_file = temp_dir().join("gpauth.html");
 
@@ -31,9 +42,31 @@ impl BrowserAuthenticator<'_> {
       file.set_permissions(fs::Permissions::from_mode(0o600))?;
       file.write_all(self.auth_request.as_bytes())?;
 
-      open::that_detached(html_file)?;
+      Cow::Owned(html_file.to_string_lossy().to_string())
+    };
+
+    if let Some(browser) = self.browser {
+      let app = find_browser_path(browser);
+
+      info!("Launching browser: {}", app);
+      open::with_detached(path.as_ref(), app)?;
+    } else {
+      info!("Launching the default browser...");
+      open::that_detached(path.as_ref())?;
     }
 
     Ok(())
   }
 }
+
+fn find_browser_path(browser: &str) -> String {
+  if browser == "chrome" {
+    which::which("google-chrome-stable")
+      .or_else(|_| which::which("google-chrome"))
+      .or_else(|_| which::which("chromium"))
+      .map(|path| path.to_string_lossy().to_string())
+      .unwrap_or_else(|_| browser.to_string())
+  } else {
+    browser.into()
+  }
+}