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 main
import (
"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 main
import (
"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 file
fileBytes, 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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