diff --git a/src/main.rs b/src/main.rs
index e7a11a9..0eb6735 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,38 @@
 fn main() {
     println!("Hello, world!");
+
+    println!("{}", generate_oss_signed_url("", "", "", "", "", 1_u64, true));
 }
+
+// https://help.aliyun.com/document_detail/31952.html
+// Signature = urlencode(base64(hmac-sha1(AccessKeySecret,
+//     VERB + "\n"
+//     + CONTENT-MD5 + "\n"
+//     + CONTENT-TYPE + "\n"
+//     + EXPIRES + "\n"
+//     + CanonicalizedOSSHeaders
+//     + CanonicalizedResource)))
+// https://git.hatter.ink/hatter/oss-backupd/wiki/Signed-OSS-URL
+fn generate_oss_signed_url(endpoint: &str, access_key_id: &str, access_key_secret: &str,
+                            bucket_name: &str, key: &str, expire_in_seconds: u64, is_http: bool) -> String {
+    let mut signed_url = String::new();
+    signed_url.push_str(if is_http {
+        "http://"
+    } else {
+        "https://"
+    });
+    signed_url.push_str(bucket_name);
+    signed_url.push_str(".");
+    signed_url.push_str(endpoint);
+    signed_url.push_str("/");
+    signed_url.push_str(key);
+
+    signed_url.push_str("?Expires=");
+    // TODO
+    signed_url.push_str("&OSSAccessKeyId=");
+    // TODO
+    signed_url.push_str("&Signature=");
+    // TODO
+
+    signed_url
+}
\ No newline at end of file