go - 如何以程序方式上传图片？

Question

如何自动将图像公开上传到Google Cloud Storage中？
我试过了
代码:

func HandleFileUploadToBucket(c *gin.Context) {
    bucket := "mybucket"  

    var err error

    ctx := appengine.NewContext(c.Request)

    storageClient, err = storage.NewClient(ctx, option.WithCredentialsFile("keys.json"))
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "message": err.Error(),
            "error":   true,
        })
        return
    }

    f, uploadedFile, err := c.Request.FormFile("file")
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "message": err.Error(),
            "error":   true,
        })
        return
    }

    defer f.Close()

    sw := storageClient.Bucket(bucket).Object(uploadedFile.Filename).NewWriter(ctx)

    sw.ACL = []storage.ACLRule{{Entity: storage.AllUsers, Role: storage.RoleReader}} // As you can see here I made it AllUser
    sw.CacheControl = "public, max-age=86400"

    if _, err := io.Copy(sw, f); err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "message": err.Error(),
            "error":   true,
        })
        return
    }

    if err := sw.Close(); err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "message": err.Error(),
            "error":   true,
        })
        return
    }

    u, err := url.Parse("/" + bucket + "/user/" + sw.Attrs().Name)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{
            "message": err.Error(),
            "Error":   true,
        })
        return
    }

    c.JSON(http.StatusOK, gin.H{
        "message":  "file uploaded successfully",
        "pathname": u.EscapedPath(),
    })
}

发生了什么事
我想要第一行
我得到第二排
结果:

Answer 1

在我的代码中，分开upload file和setting the access privileges操作对我有用的是什么。它看起来像这样:

sw := storageClient.Bucket(bucket).Object(uploadedFile.Filename).NewWriter(ctx)

sw.CacheControl = "public, max-age=86400"

if _, err := io.Copy(sw, f); err != nil {
    c.JSON(http.StatusInternalServerError, gin.H{
        "message": err.Error(),
        "error":   true,
    })
    return
}

if err := sw.Close(); err != nil {
    c.JSON(http.StatusInternalServerError, gin.H{
        "message": err.Error(),
        "error":   true,
    })
    return
}

//set public access
acl := storageClient.Bucket(bucket).Object(uploadedFile.Filename).ACL()
if err := acl.Set(ctx, storage.AllUsers, storage.RoleReader); err != nil {
   //handle error
}