Refactor using Tauri (#278)

crates/gpapi/src/gateway/login.rs

@@ -0,0 +1,74 @@
+use log::info;
+use reqwest::Client;
+use roxmltree::Document;
+use urlencoding::encode;
+
+use crate::{credential::Credential, gp_params::GpParams};
+
+pub async fn gateway_login(
+  gateway: &str,
+  cred: &Credential,
+  gp_params: &GpParams,
+) -> anyhow::Result<String> {
+  let login_url = format!("https://{}/ssl-vpn/login.esp", gateway);
+  let client = Client::builder()
+    .user_agent(gp_params.user_agent())
+    .build()?;
+
+  let mut params = cred.to_params();
+  let extra_params = gp_params.to_params();
+
+  params.extend(extra_params);
+  params.insert("server", gateway);
+
+  info!("Gateway login, user_agent: {}", gp_params.user_agent());
+
+  let res_xml = client
+    .post(&login_url)
+    .form(&params)
+    .send()
+    .await?
+    .error_for_status()?
+    .text()
+    .await?;
+
+  let doc = Document::parse(&res_xml)?;
+
+  build_gateway_token(&doc, gp_params.computer())
+}
+
+fn build_gateway_token(doc: &Document, computer: &str) -> anyhow::Result<String> {
+  let args = doc
+    .descendants()
+    .filter(|n| n.has_tag_name("argument"))
+    .map(|n| n.text().unwrap_or("").to_string())
+    .collect::<Vec<_>>();
+
+  let params = [
+    read_args(&args, 1, "authcookie")?,
+    read_args(&args, 3, "portal")?,
+    read_args(&args, 4, "user")?,
+    read_args(&args, 7, "domain")?,
+    read_args(&args, 15, "preferred-ip")?,
+    ("computer", computer),
+  ];
+
+  let token = params
+    .iter()
+    .map(|(k, v)| format!("{}={}", k, encode(v)))
+    .collect::<Vec<_>>()
+    .join("&");
+
+  Ok(token)
+}
+
+fn read_args<'a>(
+  args: &'a [String],
+  index: usize,
+  key: &'a str,
+) -> anyhow::Result<(&'a str, &'a str)> {
+  args
+    .get(index)
+    .ok_or_else(|| anyhow::anyhow!("Failed to read {key} from args"))
+    .map(|s| (key, s.as_ref()))
+}