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add function support download file #53

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add function support download file #53

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21 changes: 21 additions & 0 deletions render.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,10 @@
// m.Get("/xml", func(r render.Render) {
// r.XML(200, Greeting{One: "hello", Two: "world"})
// })
//
// m.Get("/file/:filename", func(r render.Render, params martini.Params) {
// r.Download(params[filename])
// })
//
// m.Run()
// }
Expand Down Expand Up @@ -101,6 +105,8 @@ type Render interface {
Template() *template.Template
// Header exposes the header struct from http.ResponseWriter.
Header() http.Header
// Download forces response for download file, it prepares the download response header automatically.
Download(file string, filename ...string)
}

// Delims represents a set of Left and Right delimiters for HTML template rendering
Expand Down Expand Up @@ -326,6 +332,21 @@ func (r *renderer) Data(status int, v []byte) {
r.Write(v)
}

func (r *renderer) Download(file string,filename ...string ) {
r.Header().Set("Content-Description","File Transfer")
r.Header().Set("Content-Type","application/octet-stream")
if len(filename) > 0 && filename[0] != "" {
r.Header().Set("Content-Disposition", "attachment; filename="+filename[0])
} else {
r.Header().Set("Content-Disposition", "attachment; filename="+filepath.Base(file))
}
r.Header().Set("Content-Transfer-Encoding", "binary")
r.Header().Set("Expires", "0")
r.Header().Set("Cache-Control", "must-revalidate")
r.Header().Set("Pragma", "public")
http.ServeFile(r.ResponseWriter,r.req,file)
}

func (r *renderer) Text(status int, v string) {
if r.Header().Get(ContentType) == "" {
r.Header().Set(ContentType, ContentText+r.compiledCharset)
Expand Down