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header.go
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header.go
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package httpx
import (
"net/http"
"net/url"
"strconv"
"github.com/askasoft/pango/str"
)
// NewHeaderWriter create a http.ResponseWriter to append on WriteHeader(statusCode int).
// if statusCode != 200, header will not append.
// a existing header will not be overwriten.
func NewHeaderWriter(w http.ResponseWriter, key, value string) http.ResponseWriter {
return &headerWriter{w, key, value}
}
// headerWriter write header when statusCode == 200 on WriteHeader(statusCode int)
// a existing header will not be overwriten.
type headerWriter struct {
http.ResponseWriter
key string
value string
}
// WriteHeader append header when statusCode == 200
func (hw *headerWriter) WriteHeader(statusCode int) {
if statusCode == http.StatusOK {
if hw.Header().Get(hw.key) == "" {
hw.Header().Add(hw.key, hw.value)
}
}
hw.ResponseWriter.WriteHeader(statusCode)
}
// NewHeadersWriter create a http.ResponseWriter to append on WriteHeader(statusCode int).
// if statusCode != 200, header will not append.
// a existing header will not be overwriten.
func NewHeadersWriter(w http.ResponseWriter, h map[string]string) http.ResponseWriter {
return &headersWriter{w, h}
}
// headersWriter write header when statusCode == 200 on WriteHeader(statusCode int)
// a existing header will not be overwriten.
type headersWriter struct {
http.ResponseWriter
header map[string]string
}
// WriteHeader append header when statusCode == 200
func (hw *headersWriter) WriteHeader(statusCode int) {
if statusCode == http.StatusOK {
for k, v := range hw.header {
if hw.Header().Get(k) == "" {
hw.Header().Add(k, v)
}
}
}
hw.ResponseWriter.WriteHeader(statusCode)
}
// SetAttachmentHeader set header Content-Disposition: attachment; filename=...
func SetAttachmentHeader(header http.Header, filename string) {
var v string
if str.IsASCII(filename) {
v = `attachment; filename=` + strconv.Quote(filename)
} else {
v = `attachment; filename*=UTF-8''` + url.QueryEscape(filename)
}
header.Set("Content-Disposition", v)
}