298 lines
8.5 KiB
Go
298 lines
8.5 KiB
Go
package context
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import (
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"bytes"
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"compress/flate"
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"compress/gzip"
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"encoding/json"
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"encoding/xml"
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"errors"
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"fmt"
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"html/template"
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"io"
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"mime"
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"net/http"
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"path/filepath"
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"strconv"
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"strings"
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)
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// BeegoOutput does work for sending response header.
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type BeegoOutput struct {
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Context *Context
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Status int
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EnableGzip bool
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}
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// NewOutput returns new BeegoOutput.
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// it contains nothing now.
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func NewOutput() *BeegoOutput {
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return &BeegoOutput{}
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}
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// Header sets response header item string via given key.
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func (output *BeegoOutput) Header(key, val string) {
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output.Context.ResponseWriter.Header().Set(key, val)
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}
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// Body sets response body content.
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// if EnableGzip, compress content string.
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// it sends out response body directly.
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func (output *BeegoOutput) Body(content []byte) {
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output_writer := output.Context.ResponseWriter.(io.Writer)
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if output.EnableGzip == true && output.Context.Input.Header("Accept-Encoding") != "" {
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splitted := strings.SplitN(output.Context.Input.Header("Accept-Encoding"), ",", -1)
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encodings := make([]string, len(splitted))
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for i, val := range splitted {
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encodings[i] = strings.TrimSpace(val)
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}
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for _, val := range encodings {
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if val == "gzip" {
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output.Header("Content-Encoding", "gzip")
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output_writer, _ = gzip.NewWriterLevel(output.Context.ResponseWriter, gzip.BestSpeed)
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break
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} else if val == "deflate" {
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output.Header("Content-Encoding", "deflate")
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output_writer, _ = flate.NewWriter(output.Context.ResponseWriter, flate.BestSpeed)
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break
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}
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}
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} else {
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output.Header("Content-Length", strconv.Itoa(len(content)))
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}
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output_writer.Write(content)
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switch output_writer.(type) {
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case *gzip.Writer:
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output_writer.(*gzip.Writer).Close()
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case *flate.Writer:
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output_writer.(*flate.Writer).Close()
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}
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}
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// Cookie sets cookie value via given key.
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// others are ordered as cookie's max age time, path,domain, secure and httponly.
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func (output *BeegoOutput) Cookie(name string, value string, others ...interface{}) {
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var b bytes.Buffer
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fmt.Fprintf(&b, "%s=%s", sanitizeName(name), sanitizeValue(value))
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if len(others) > 0 {
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switch others[0].(type) {
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case int:
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if others[0].(int) > 0 {
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fmt.Fprintf(&b, "; Max-Age=%d", others[0].(int))
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} else if others[0].(int) < 0 {
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fmt.Fprintf(&b, "; Max-Age=0")
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}
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case int64:
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if others[0].(int64) > 0 {
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fmt.Fprintf(&b, "; Max-Age=%d", others[0].(int64))
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} else if others[0].(int64) < 0 {
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fmt.Fprintf(&b, "; Max-Age=0")
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}
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case int32:
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if others[0].(int32) > 0 {
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fmt.Fprintf(&b, "; Max-Age=%d", others[0].(int32))
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} else if others[0].(int32) < 0 {
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fmt.Fprintf(&b, "; Max-Age=0")
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}
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}
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}
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if len(others) > 1 {
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fmt.Fprintf(&b, "; Path=%s", sanitizeValue(others[1].(string)))
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}
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if len(others) > 2 {
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fmt.Fprintf(&b, "; Domain=%s", sanitizeValue(others[2].(string)))
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}
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if len(others) > 3 {
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fmt.Fprintf(&b, "; Secure")
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}
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if len(others) > 4 {
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fmt.Fprintf(&b, "; HttpOnly")
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}
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output.Context.ResponseWriter.Header().Add("Set-Cookie", b.String())
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}
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var cookieNameSanitizer = strings.NewReplacer("\n", "-", "\r", "-")
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func sanitizeName(n string) string {
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return cookieNameSanitizer.Replace(n)
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}
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var cookieValueSanitizer = strings.NewReplacer("\n", " ", "\r", " ", ";", " ")
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func sanitizeValue(v string) string {
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return cookieValueSanitizer.Replace(v)
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}
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// Json writes json to response body.
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// if coding is true, it converts utf-8 to \u0000 type.
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func (output *BeegoOutput) Json(data interface{}, hasIndent bool, coding bool) error {
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output.Header("Content-Type", "application/json;charset=UTF-8")
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var content []byte
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var err error
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if hasIndent {
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content, err = json.MarshalIndent(data, "", " ")
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} else {
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content, err = json.Marshal(data)
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}
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if err != nil {
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http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
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return err
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}
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if coding {
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content = []byte(stringsToJson(string(content)))
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}
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output.Body(content)
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return nil
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}
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// Jsonp writes jsonp to response body.
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func (output *BeegoOutput) Jsonp(data interface{}, hasIndent bool) error {
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output.Header("Content-Type", "application/javascript;charset=UTF-8")
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var content []byte
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var err error
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if hasIndent {
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content, err = json.MarshalIndent(data, "", " ")
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} else {
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content, err = json.Marshal(data)
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}
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if err != nil {
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http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
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return err
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}
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callback := output.Context.Input.Query("callback")
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if callback == "" {
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return errors.New(`"callback" parameter required`)
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}
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callback_content := bytes.NewBufferString(" " + template.JSEscapeString(callback))
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callback_content.WriteString("(")
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callback_content.Write(content)
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callback_content.WriteString(");\r\n")
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output.Body(callback_content.Bytes())
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return nil
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}
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// Xml writes xml string to response body.
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func (output *BeegoOutput) Xml(data interface{}, hasIndent bool) error {
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output.Header("Content-Type", "application/xml;charset=UTF-8")
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var content []byte
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var err error
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if hasIndent {
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content, err = xml.MarshalIndent(data, "", " ")
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} else {
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content, err = xml.Marshal(data)
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}
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if err != nil {
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http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
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return err
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}
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output.Body(content)
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return nil
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}
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// Download forces response for download file.
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// it prepares the download response header automatically.
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func (output *BeegoOutput) Download(file string) {
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output.Header("Content-Description", "File Transfer")
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output.Header("Content-Type", "application/octet-stream")
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output.Header("Content-Disposition", "attachment; filename="+filepath.Base(file))
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output.Header("Content-Transfer-Encoding", "binary")
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output.Header("Expires", "0")
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output.Header("Cache-Control", "must-revalidate")
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output.Header("Pragma", "public")
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http.ServeFile(output.Context.ResponseWriter, output.Context.Request, file)
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}
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// ContentType sets the content type from ext string.
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// MIME type is given in mime package.
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func (output *BeegoOutput) ContentType(ext string) {
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if !strings.HasPrefix(ext, ".") {
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ext = "." + ext
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}
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ctype := mime.TypeByExtension(ext)
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if ctype != "" {
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output.Header("Content-Type", ctype)
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}
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}
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// SetStatus sets response status code.
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// It writes response header directly.
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func (output *BeegoOutput) SetStatus(status int) {
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output.Context.ResponseWriter.WriteHeader(status)
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output.Status = status
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}
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// IsCachable returns boolean of this request is cached.
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// HTTP 304 means cached.
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func (output *BeegoOutput) IsCachable(status int) bool {
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return output.Status >= 200 && output.Status < 300 || output.Status == 304
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}
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// IsEmpty returns boolean of this request is empty.
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// HTTP 201，204 and 304 means empty.
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func (output *BeegoOutput) IsEmpty(status int) bool {
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return output.Status == 201 || output.Status == 204 || output.Status == 304
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}
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// IsOk returns boolean of this request runs well.
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// HTTP 200 means ok.
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func (output *BeegoOutput) IsOk(status int) bool {
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return output.Status == 200
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}
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// IsSuccessful returns boolean of this request runs successfully.
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// HTTP 2xx means ok.
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func (output *BeegoOutput) IsSuccessful(status int) bool {
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return output.Status >= 200 && output.Status < 300
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}
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// IsRedirect returns boolean of this request is redirection header.
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// HTTP 301,302,307 means redirection.
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func (output *BeegoOutput) IsRedirect(status int) bool {
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return output.Status == 301 || output.Status == 302 || output.Status == 303 || output.Status == 307
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}
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// IsForbidden returns boolean of this request is forbidden.
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// HTTP 403 means forbidden.
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func (output *BeegoOutput) IsForbidden(status int) bool {
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return output.Status == 403
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}
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// IsNotFound returns boolean of this request is not found.
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// HTTP 404 means forbidden.
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func (output *BeegoOutput) IsNotFound(status int) bool {
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return output.Status == 404
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}
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// IsClient returns boolean of this request client sends error data.
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// HTTP 4xx means forbidden.
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func (output *BeegoOutput) IsClientError(status int) bool {
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return output.Status >= 400 && output.Status < 500
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}
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// IsServerError returns boolean of this server handler errors.
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// HTTP 5xx means server internal error.
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func (output *BeegoOutput) IsServerError(status int) bool {
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return output.Status >= 500 && output.Status < 600
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}
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func stringsToJson(str string) string {
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rs := []rune(str)
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jsons := ""
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for _, r := range rs {
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rint := int(r)
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if rint < 128 {
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jsons += string(r)
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} else {
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jsons += "\\u" + strconv.FormatInt(int64(rint), 16) // json
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}
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}
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return jsons
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}
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// Sessions sets session item value with given key.
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func (output *BeegoOutput) Session(name interface{}, value interface{}) {
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output.Context.Input.CruSession.Set(name, value)
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}
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