Use SOCKS5 configuration for HTTP requests

src/socks.rs

@@ -9,11 +9,13 @@ use fast_socks5::client::{Config, Socks5Stream};
 use fast_socks5::util::target_addr::ToTargetAddr;
 use fast_socks5::AuthenticationMethod;
 use fast_socks5::Socks5Command;
+use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
 use tokio::net::TcpStream;
 use tokio_io_timeout::TimeoutStream;
 
 use crate::context::Context;
 use crate::net::connect_tcp;
+use crate::sql::Sql;
 
 #[derive(Default, Debug, Clone, PartialEq, Eq)]
 pub struct Socks5Config {
@@ -24,9 +26,7 @@ pub struct Socks5Config {
 
 impl Socks5Config {
     /// Reads SOCKS5 configuration from the database.
-    pub async fn from_database(context: &Context) -> Result<Option<Self>> {
-        let sql = &context.sql;
-
+    pub async fn from_database(sql: &Sql) -> Result<Option<Self>> {
         let enabled = sql.get_raw_config_bool("socks5_enabled").await?;
         if enabled {
             let host = sql.get_raw_config("socks5_host").await?.unwrap_or_default();
@@ -55,6 +55,20 @@ impl Socks5Config {
         }
     }
 
+    /// Converts SOCKS5 configuration into URL.
+    pub fn to_url(&self) -> String {
+        // `socks5h` means that hostname is resolved into address by the proxy
+        // and DNS requests should not leak.
+        let mut url = "socks5h://".to_string();
+        if let Some((username, password)) = &self.user_password {
+            let username_urlencoded = utf8_percent_encode(username, NON_ALPHANUMERIC).to_string();
+            let password_urlencoded = utf8_percent_encode(password, NON_ALPHANUMERIC).to_string();
+            url += &format!("{username_urlencoded}:{password_urlencoded}@");
+        }
+        url += &format!("{}:{}", self.host, self.port);
+        url
+    }
+
     /// If `load_dns_cache` is true, loads cached DNS resolution results.
     /// Use this only if the connection is going to be protected with TLS checks.
     pub async fn connect(
@@ -103,3 +117,35 @@ impl fmt::Display for Socks5Config {
         )
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_socks5h_url() {
+        let config = Socks5Config {
+            host: "127.0.0.1".to_string(),
+            port: 9050,
+            user_password: None,
+        };
+        assert_eq!(config.to_url(), "socks5h://127.0.0.1:9050");
+
+        let config = Socks5Config {
+            host: "example.org".to_string(),
+            port: 1080,
+            user_password: Some(("root".to_string(), "toor".to_string())),
+        };
+        assert_eq!(config.to_url(), "socks5h://root:toor@example.org:1080");
+
+        let config = Socks5Config {
+            host: "example.org".to_string(),
+            port: 1080,
+            user_password: Some(("root".to_string(), "foo/?\\@".to_string())),
+        };
+        assert_eq!(
+            config.to_url(),
+            "socks5h://root:foo%2F%3F%5C%40@example.org:1080"
+        );
+    }
+}