feat(ssa): Complete T-test end-to-end testing with 9 bug fixes - Phase 1 core 85% complete. R service: missing value auto-filter. Backend: error handling, variable matching, dynamic filename. Frontend: module activation, session isolation, error propagation. Full flow verified.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/03-业务模块/SSA-智能统计分析/06-开发记录/oss_signer.R

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+# utils/oss_signer.R
+# 阿里云 OSS 签名生成器 (R语言实现)
+# 参考文档: https://help.aliyun.com/document_detail/31951.html
+
+library(digest)
+library(base64enc)
+
+#' 生成 OSS API 签名头
+#' @param config 包含 access_key_id, access_key_secret, bucket 的列表
+#' @param verb HTTP 方法 (GET, PUT, etc.)
+#' @param resource OSS 资源路径 (例如 "/my-bucket/data/file.csv")
+#' @param content_type 内容类型 (可选)
+#' @param content_md5 内容 MD5 (可选)
+#' @return 包含 Authorization 和 Date 的命名向量
+generate_oss_signature <- function(config, verb, resource, content_type = "", content_md5 = "") {
+  
+  # 1. 生成标准时间戳 (GMT 格式)
+  # 例如: "Thu, 18 Feb 2026 08:00:00 GMT"
+  date <- format(Sys.time(), "%a, %d %b %Y %H:%M:%S GMT", tz="GMT")
+  
+  # 2. 构造 CanonicalizedResource
+  # 格式: /BucketName/ObjectName
+  canonicalized_resource <- paste0("/", config$bucket, "/", resource)
+  
+  # 3. 构造 StringToSign
+  # 格式:
+  # VERB + "\n" +
+  # Content-MD5 + "\n" +
+  # Content-Type + "\n" +
+  # Date + "\n" +
+  # CanonicalizedOSSHeaders +
+  # CanonicalizedResource
+  
+  # 注意: 这里简化处理，未包含 CanonicalizedOSSHeaders (x-oss-*)
+  string_to_sign <- paste(
+    verb,
+    content_md5,
+    content_type,
+    date,
+    canonicalized_resource,
+    sep = "\n"
+  )
+  
+  # 4. 计算 HMAC-SHA1 签名
+  # 使用 AccessKeySecret 作为密钥
+  signature <- base64encode(hmac(config$access_key_secret, string_to_sign, algo = "sha1", raw = TRUE))
+  
+  # 5. 构造 Authorization 头
+  auth_header <- paste0("OSS ", config$access_key_id, ":", signature)
+  
+  # 返回需要的 Headers
+  return(c(
+    "Authorization" = auth_header,
+    "Date" = date
+  ))
+}