新增: 云OSS存储集成（七牛云+阿里云）+多桶导航+GBK编码自动转换

internal/oss/aliyun/bucket.go

@@ -0,0 +1,73 @@
+package aliyun
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"u-desk/internal/oss"
+)
+
+// ListBuckets 列出所有存储桶
+func ListBuckets(accessKeyID, accessKeySecret, endpoint string) ([]oss.BucketEntry, error) {
+	if endpoint == "" {
+		endpoint = "oss-cn-hangzhou.aliyuncs.com"
+	}
+	url := "https://" + endpoint + "/"
+
+	req, _ := http.NewRequest("GET", url, nil)
+	date := time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05 GMT")
+	req.Header.Set("Date", date)
+
+	stringToSign := "GET\n\n\n" + date + "\n/"
+	signature := sign(accessKeySecret, stringToSign)
+	req.Header.Set("Authorization", "OSS "+accessKeyID+":"+signature)
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("列举存储桶失败: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("列举存储桶失败: HTTP %d: %s", resp.StatusCode, string(body))
+	}
+
+	var result listAllMyBucketsResult
+	if err := xml.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("解析存储桶列表失败: %w", err)
+	}
+
+	entries := make([]oss.BucketEntry, len(result.Buckets.Bucket))
+	for i, b := range result.Buckets.Bucket {
+		entries[i] = oss.BucketEntry{
+			Name:   b.Name,
+			Region: b.Location,
+		}
+	}
+	return entries, nil
+}
+
+func sign(secretKey, data string) string {
+	mac := hmac.New(sha1.New, []byte(secretKey))
+	mac.Write([]byte(data))
+	return base64.StdEncoding.EncodeToString(mac.Sum(nil))
+}
+
+type listAllMyBucketsResult struct {
+	XMLName xml.Name `xml:"ListAllMyBucketsResult"`
+	Buckets struct {
+		Bucket []bucketEntryXML `xml:"Bucket"`
+	} `xml:"Buckets"`
+}
+
+type bucketEntryXML struct {
+	Name     string `xml:"Name"`
+	Location string `xml:"Location"`
+}