diff --git a/go.mod b/go.mod
index 11de968..995487a 100644
--- a/go.mod
+++ b/go.mod
@@ -15,6 +15,7 @@ require (
 	github.com/gin-gonic/gin v1.4.0
 	github.com/go-ini/ini v1.50.0
 	github.com/gomodule/redigo v2.0.0+incompatible
+	github.com/google/go-querystring v1.0.0
 	github.com/jinzhu/gorm v1.9.11
 	github.com/juju/ratelimit v1.0.1
 	github.com/mattn/go-colorable v0.1.4 // indirect
diff --git a/pkg/filesystem/driver/cos/handller.go b/pkg/filesystem/driver/cos/handller.go
index 7b81b6f..812b800 100644
--- a/pkg/filesystem/driver/cos/handller.go
+++ b/pkg/filesystem/driver/cos/handller.go
@@ -12,8 +12,10 @@ import (
 	"github.com/HFO4/cloudreve/pkg/filesystem/fsctx"
 	"github.com/HFO4/cloudreve/pkg/filesystem/response"
 	"github.com/HFO4/cloudreve/pkg/serializer"
+	"github.com/google/go-querystring/query"
 	cossdk "github.com/tencentyun/cos-go-sdk-v5"
 	"io"
+	"net/http"
 	"net/url"
 	"time"
 )
@@ -31,6 +33,11 @@ type MetaData struct {
 	CallbackURL string
 }
 
+type urlOption struct {
+	Speed              int    `url:"x-cos-traffic-limit,omitempty"`
+	ContentDescription string `url:"response-content-disposition,omitempty"`
+}
+
 // Driver 腾讯云COS适配器模板
 type Driver struct {
 	Policy *model.Policy
@@ -87,7 +94,67 @@ func (handler Driver) Source(
 	isDownload bool,
 	speed int,
 ) (string, error) {
-	return "", errors.New("未实现")
+	// 尝试从上下文获取文件名
+	fileName := ""
+	if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
+		fileName = file.Name
+	}
+
+	// 添加各项设置
+	options := urlOption{}
+	if speed > 0 {
+		if speed < 819200 {
+			speed = 819200
+		}
+		if speed > 838860800 {
+			speed = 838860800
+		}
+		options.Speed = speed
+	}
+	if isDownload {
+		options.ContentDescription = "attachment; filename=\"" + url.PathEscape(fileName) + "\""
+	}
+
+	return handler.signSourceURL(ctx, path, ttl, &options)
+}
+
+func (handler Driver) signSourceURL(ctx context.Context, path string, ttl int64, options *urlOption) (string, error) {
+	cdnURL, err := url.Parse(handler.Policy.BaseURL)
+	if err != nil {
+		return "", err
+	}
+
+	// 公有空间不需要签名
+	if !handler.Policy.IsPrivate {
+		file, err := url.Parse(path)
+		if err != nil {
+			return "", err
+		}
+
+		// 非签名URL不支持设置响应header
+		options.ContentDescription = ""
+
+		optionQuery, err := query.Values(*options)
+		if err != nil {
+			return "", err
+		}
+		file.RawQuery = optionQuery.Encode()
+		sourceURL := cdnURL.ResolveReference(file)
+
+		return sourceURL.String(), nil
+	}
+
+	presignedURL, err := handler.Client.Object.GetPresignedURL(ctx, http.MethodGet, path,
+		handler.Policy.AccessKey, handler.Policy.SecretKey, time.Duration(ttl)*time.Second, options)
+	if err != nil {
+		return "", err
+	}
+
+	// 将最终生成的签名URL域名换成用户自定义的加速域名（如果有）
+	presignedURL.Host = cdnURL.Host
+	presignedURL.Scheme = cdnURL.Scheme
+
+	return presignedURL.String(), nil
 }
 
 // Token 获取上传策略和认证Token
diff --git a/pkg/filesystem/driver/onedrive/api_test.go b/pkg/filesystem/driver/onedrive/api_test.go
index a1295d2..2152f76 100644
--- a/pkg/filesystem/driver/onedrive/api_test.go
+++ b/pkg/filesystem/driver/onedrive/api_test.go
@@ -388,7 +388,7 @@ func TestClient_UploadChunk(t *testing.T) {
 			ChunkSize: 10,
 			Total:     100,
 			Retried:   0,
-			Data:      strings.NewReader("1231312"),
+			Data:      []byte("12313121231312"),
 		})
 		clientMock.AssertExpectations(t)
 		asserts.NoError(err)
@@ -418,7 +418,7 @@ func TestClient_UploadChunk(t *testing.T) {
 			ChunkSize: 10,
 			Total:     100,
 			Retried:   0,
-			Data:      strings.NewReader("1231312"),
+			Data:      []byte("12313112313122"),
 		})
 		clientMock.AssertExpectations(t)
 		asserts.Error(err)
@@ -448,7 +448,7 @@ func TestClient_UploadChunk(t *testing.T) {
 			ChunkSize: 5,
 			Total:     100,
 			Retried:   0,
-			Data:      strings.NewReader("1231312"),
+			Data:      []byte("1231312"),
 		})
 		clientMock.AssertExpectations(t)
 		asserts.NoError(err)
@@ -483,7 +483,7 @@ func TestClient_UploadChunk(t *testing.T) {
 			ChunkSize: 5,
 			Total:     100,
 			Retried:   0,
-			Data:      strings.NewReader("1231312"),
+			Data:      []byte("1231312"),
 		}
 		res, err := client.UploadChunk(context.Background(), "http://dev.com", chunk)
 		clientMock.AssertExpectations(t)