feat: add OpenCSG download support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "dragonfly-api"
-version = "2.3.0"
+version = "2.3.1"
 authors = ["Gaius <gaius.qi@gmail.com>"]
 edition = "2021"
 license = "Apache-2.0"

pkg/apis/common/v2/common.proto

@@ -725,6 +725,8 @@ message Download {
   // If metadata_only is true, the peer registers with the scheduler only to report
   // the metadata of the task, no need to be scheduled for downloading pieces.
   bool metadata_only = 33;
+  // OpenCSG protocol information.
+  optional OpenCSG open_csg = 34;
 
   reserved 21;
   reserved "load_to_cache";
@@ -817,6 +819,25 @@ message ModelScope {
   }];
 }
 
+// OpenCSG related information.
+message OpenCSG {
+  // Access token for OpenCSG Hub.
+  optional string token = 1 [(validate.rules).string = {
+    min_len: 1
+    ignore_empty: true
+  }];
+  // Revision of the OpenCSG repository. It can be a branch name, tag name, or commit hash. This field must not be empty.
+  // Clients should use "main" when the user does not specify a revision.
+  string revision = 2 [(validate.rules).string = {
+    min_len: 1
+  }];
+  // Base URL of OpenCSG Hub. If not specified, it defaults to https://hub.opencsg.com/csg/.
+  optional string base_url = 3 [(validate.rules).string = {
+    uri: true
+    ignore_empty: true
+  }];
+}
+
 // Range represents download range.
 message Range {
   // Start of range.