feat: initial support of method call

sdgb-api/src/title/mod.rs

@@ -1,17 +1,67 @@
-use crate::title::error::ApiError;
+use std::fmt::Display;
+
+use crate::title::methods::APIMethod;
 
 pub mod encryption;
+pub mod methods;
+pub mod model;
+
 mod error;
+pub use error::ApiError;
+use nyquest::{
+    Body,
+    r#async::Request,
+    header::{ACCEPT_ENCODING, CONTENT_ENCODING, EXPECT, USER_AGENT},
+};
+use serde::Serialize;
 
 pub trait MaiVersion {
     const AES_KEY: &[u8; 32];
     const AES_IV: &[u8; 16];
-    const OBFUSECATE_PARAM: &str;
+    const OBFUSECATE_SUFFIX: &str;
+    const VERSION: &str;
 }
 
 pub trait MaiVersionExt: MaiVersion {
     fn encode(data: impl AsRef<[u8]>) -> Result<Vec<u8>, ApiError>;
     fn decode(data: impl AsMut<[u8]>) -> Result<Vec<u8>, ApiError>;
+
+    fn api_hash(api: APIMethod) -> String {
+        let api_name: &str = api.into();
+
+        let mut md5 = md5::Context::new();
+        md5.consume(api_name);
+        md5.consume(Self::OBFUSECATE_SUFFIX);
+        let digest = md5.finalize();
+
+        format!("{digest:x}")
+    }
+
+    fn api_request<D>(
+        api: APIMethod,
+        agent_extra: impl Display,
+        data: D,
+    ) -> Result<Request, ApiError>
+    where
+        D: Serialize,
+    {
+        let json = serde_json::to_vec(&data)?;
+        let payload = Self::encode(json)?;
+
+        let api_hash = Self::api_hash(api);
+        let req = Request::post(format!(
+            "https://maimai-gm.wahlap.com:42081/Maimai2Servlet/{api_hash}"
+        ))
+        .with_body(Body::json_bytes(payload))
+        .with_header(USER_AGENT, format!("{api_hash}#{agent_extra}"))
+        .with_header("Mai-Encoding", Self::VERSION)
+        .with_header(ACCEPT_ENCODING, "")
+        .with_header("Charset", "UTF-8")
+        .with_header(CONTENT_ENCODING, "deflate")
+        .with_header(EXPECT, "100-continue");
+
+        Ok(req)
+    }
 }
 
 pub struct Sdgb1_40;
@@ -20,10 +70,14 @@ pub struct Sdgb1_50;
 impl MaiVersion for Sdgb1_40 {
     const AES_KEY: &[u8; 32] = b"n7bx6:@Fg_:2;5E89Phy7AyIcpxEQ:R@";
     const AES_IV: &[u8; 16] = b";;KjR1C3hgB1ovXa";
-    const OBFUSECATE_PARAM: &str = "BEs2D5vW";
+    const OBFUSECATE_SUFFIX: &str = "MaimaiChnBEs2D5vW";
+
+    const VERSION: &str = "1.40";
 }
 impl MaiVersion for Sdgb1_50 {
     const AES_KEY: &[u8; 32] = b"a>32bVP7v<63BVLkY[xM>daZ1s9MBP<R";
     const AES_IV: &[u8; 16] = b"d6xHIKq]1J]Dt^ue";
-    const OBFUSECATE_PARAM: &str = "B44df8yT";
+    const OBFUSECATE_SUFFIX: &str = "MaimaiChnB44df8yT";
+
+    const VERSION: &str = "1.50";
 }