first commit

proto/store/attachment.proto

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+syntax = "proto3";
+
+package memos.store;
+
+import "google/protobuf/timestamp.proto";
+import "store/instance_setting.proto";
+
+option go_package = "gen/store";
+
+enum AttachmentStorageType {
+  ATTACHMENT_STORAGE_TYPE_UNSPECIFIED = 0;
+  // Attachment is stored locally. AKA, local file system.
+  LOCAL = 1;
+  // Attachment is stored in S3.
+  S3 = 2;
+  // Attachment is stored in an external storage. The reference is a URL.
+  EXTERNAL = 3;
+}
+
+message AttachmentPayload {
+  oneof payload {
+    S3Object s3_object = 1;
+  }
+
+  message S3Object {
+    StorageS3Config s3_config = 1;
+    // key is the S3 object key.
+    string key = 2;
+    // last_presigned_time is the last time the object was presigned.
+    // This is used to determine if the presigned URL is still valid.
+    google.protobuf.Timestamp last_presigned_time = 3;
+  }
+}