英文:
serve file endpoint in golang with gin
问题
我想要为动态加载的用户文件提供服务（假设是简单的文件存储），但在发送实际文件之前，我想要添加一些检查（比如用户是否被禁止）。我知道在gin中有一种方法可以提供整个目录的服务，也有一种方法可以将文件作为附件发送（https://stackoverflow.com/questions/31638447/how-to-server-a-file-from-a-handler-in-golang），但是否有一种方法可以将文件直接作为实际图像发送回浏览器（而不是下载附件提示），就像这个纯Go语言示例中一样（https://golangbyexample.com/image-http-response-golang/）：
package mainimport ("io/ioutil""net/http")func main() {handler := http.HandlerFunc(handleRequest)http.Handle("/photo", handler)http.ListenAndServe(":8080", nil)}func handleRequest(w http.ResponseWriter, r *http.Request) {fileBytes, err := ioutil.ReadFile("test.png")if err != nil {panic(err)}w.WriteHeader(http.StatusOK)w.Header().Set("Content-Type", "application/octet-stream")w.Write(fileBytes)return}
英文:
I would like to serve dynamically loaded user files (let's assume simple file storage) but I want to add some checks before sending actual file (like was the user banned). I know there is a way to serve whole directory in gin, there is also way to send file as attachment (https://stackoverflow.com/questions/31638447/how-to-server-a-file-from-a-handler-in-golang) but is there a way to simply send back file as actual image to show in browser (without download attachment prompt) as in this pure golang example (https://golangbyexample.com/image-http-response-golang/):
package mainimport ("io/ioutil""net/http")func main() {handler := http.HandlerFunc(handleRequest)http.Handle("/photo", handler)http.ListenAndServe(":8080", nil)}func handleRequest(w http.ResponseWriter, r *http.Request) {fileBytes, err := ioutil.ReadFile("test.png")if err != nil {panic(err)}w.WriteHeader(http.StatusOK)w.Header().Set("Content-Type", "application/octet-stream")w.Write(fileBytes)return}
答案1
得分: 2
是的，使用go-gin是可以实现的。你可以使用gin上下文的Data方法。
import ("io/ioutil""net/http""github.com/gin-gonic/gin")func main() {r := gin.Default()r.GET("/photo", photoHandler)if err := r.Run(":8080"); err != nil {panic(err)}}func photoHandler(c *gin.Context) {// 在这里进行其他检查// 读取文件fileBytes, err := ioutil.ReadFile("test.png")if err != nil {panic(err)}c.Data(http.StatusOK, "image/png", fileBytes)}
你可以在这里查看gin提供的示例代码链接。
英文:
Yes, it is possible with go-gin. You can use Data method of gin context.
> Data writes some data into the body stream and updates the HTTP code.
import ("io/ioutil""net/http""github.com/gin-gonic/gin")func main() {r := gin.Default()r.GET("/photo", photoHandler)if err := r.Run(":8080"); err != nil {panic(err)}}func photoHandler(c *gin.Context) {// do the other checks here// read the filefileBytes, err := ioutil.ReadFile("test.png")if err != nil {panic(err)}c.Data(http.StatusOK, "image/png", fileBytes)}
Check gin provided sample code here
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