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Beego/pkg/server/web/context/output.go
2020-08-30 15:39:07 +00:00

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// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package context
import (
"bytes"
"encoding/json"
"encoding/xml"
"errors"
"fmt"
"html/template"
"io"
"mime"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"time"
yaml "gopkg.in/yaml.v2"
)
// BeegoOutput does work for sending response header.
type BeegoOutput struct {
Context *Context
Status int
EnableGzip bool
}
// NewOutput returns new BeegoOutput.
// Empty when initialized
func NewOutput() *BeegoOutput {
return &BeegoOutput{}
}
// Reset initializes BeegoOutput
func (output *BeegoOutput) Reset(ctx *Context) {
output.Context = ctx
output.Status = 0
}
// Header sets response header item string via given key.
func (output *BeegoOutput) Header(key, val string) {
output.Context.ResponseWriter.Header().Set(key, val)
}
// Body sets the response body content.
// if EnableGzip, content is compressed.
// Sends out response body directly.
func (output *BeegoOutput) Body(content []byte) error {
var encoding string
var buf = &bytes.Buffer{}
if output.EnableGzip {
encoding = ParseEncoding(output.Context.Request)
}
if b, n, _ := WriteBody(encoding, buf, content); b {
output.Header("Content-Encoding", n)
output.Header("Content-Length", strconv.Itoa(buf.Len()))
} else {
output.Header("Content-Length", strconv.Itoa(len(content)))
}
// Write status code if it has been set manually
// Set it to 0 afterwards to prevent "multiple response.WriteHeader calls"
if output.Status != 0 {
output.Context.ResponseWriter.WriteHeader(output.Status)
output.Status = 0
} else {
output.Context.ResponseWriter.Started = true
}
io.Copy(output.Context.ResponseWriter, buf)
return nil
}
// Cookie sets a cookie value via given key.
// others: used to set a cookie's max age time, path,domain, secure and httponly.
func (output *BeegoOutput) Cookie(name string, value string, others ...interface{}) {
var b bytes.Buffer
fmt.Fprintf(&b, "%s=%s", sanitizeName(name), sanitizeValue(value))
// fix cookie not work in IE
if len(others) > 0 {
var maxAge int64
switch v := others[0].(type) {
case int:
maxAge = int64(v)
case int32:
maxAge = int64(v)
case int64:
maxAge = v
}
switch {
case maxAge > 0:
fmt.Fprintf(&b, "; Expires=%s; Max-Age=%d", time.Now().Add(time.Duration(maxAge)*time.Second).UTC().Format(time.RFC1123), maxAge)
case maxAge < 0:
fmt.Fprintf(&b, "; Max-Age=0")
}
}
// the settings below
// Path, Domain, Secure, HttpOnly
// can use nil skip set
// default "/"
if len(others) > 1 {
if v, ok := others[1].(string); ok && len(v) > 0 {
fmt.Fprintf(&b, "; Path=%s", sanitizeValue(v))
}
} else {
fmt.Fprintf(&b, "; Path=%s", "/")
}
// default empty
if len(others) > 2 {
if v, ok := others[2].(string); ok && len(v) > 0 {
fmt.Fprintf(&b, "; Domain=%s", sanitizeValue(v))
}
}
// default empty
if len(others) > 3 {
var secure bool
switch v := others[3].(type) {
case bool:
secure = v
default:
if others[3] != nil {
secure = true
}
}
if secure {
fmt.Fprintf(&b, "; Secure")
}
}
// default false. for session cookie default true
if len(others) > 4 {
if v, ok := others[4].(bool); ok && v {
fmt.Fprintf(&b, "; HttpOnly")
}
}
output.Context.ResponseWriter.Header().Add("Set-Cookie", b.String())
}
var cookieNameSanitizer = strings.NewReplacer("\n", "-", "\r", "-")
func sanitizeName(n string) string {
return cookieNameSanitizer.Replace(n)
}
var cookieValueSanitizer = strings.NewReplacer("\n", " ", "\r", " ", ";", " ")
func sanitizeValue(v string) string {
return cookieValueSanitizer.Replace(v)
}
func jsonRenderer(value interface{}) Renderer {
return rendererFunc(func(ctx *Context) {
ctx.Output.JSON(value, false, false)
})
}
func errorRenderer(err error) Renderer {
return rendererFunc(func(ctx *Context) {
ctx.Output.SetStatus(500)
ctx.Output.Body([]byte(err.Error()))
})
}
// JSON writes json to the response body.
// if encoding is true, it converts utf-8 to \u0000 type.
func (output *BeegoOutput) JSON(data interface{}, hasIndent bool, encoding bool) error {
output.Header("Content-Type", "application/json; charset=utf-8")
var content []byte
var err error
if hasIndent {
content, err = json.MarshalIndent(data, "", " ")
} else {
content, err = json.Marshal(data)
}
if err != nil {
http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
return err
}
if encoding {
content = []byte(stringsToJSON(string(content)))
}
return output.Body(content)
}
// YAML writes yaml to the response body.
func (output *BeegoOutput) YAML(data interface{}) error {
output.Header("Content-Type", "application/x-yaml; charset=utf-8")
var content []byte
var err error
content, err = yaml.Marshal(data)
if err != nil {
http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
return err
}
return output.Body(content)
}
// JSONP writes jsonp to the response body.
func (output *BeegoOutput) JSONP(data interface{}, hasIndent bool) error {
output.Header("Content-Type", "application/javascript; charset=utf-8")
var content []byte
var err error
if hasIndent {
content, err = json.MarshalIndent(data, "", " ")
} else {
content, err = json.Marshal(data)
}
if err != nil {
http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
return err
}
callback := output.Context.Input.Query("callback")
if callback == "" {
return errors.New(`"callback" parameter required`)
}
callback = template.JSEscapeString(callback)
callbackContent := bytes.NewBufferString(" if(window." + callback + ")" + callback)
callbackContent.WriteString("(")
callbackContent.Write(content)
callbackContent.WriteString(");\r\n")
return output.Body(callbackContent.Bytes())
}
// XML writes xml string to the response body.
func (output *BeegoOutput) XML(data interface{}, hasIndent bool) error {
output.Header("Content-Type", "application/xml; charset=utf-8")
var content []byte
var err error
if hasIndent {
content, err = xml.MarshalIndent(data, "", " ")
} else {
content, err = xml.Marshal(data)
}
if err != nil {
http.Error(output.Context.ResponseWriter, err.Error(), http.StatusInternalServerError)
return err
}
return output.Body(content)
}
// ServeFormatted serves YAML, XML or JSON, depending on the value of the Accept header
func (output *BeegoOutput) ServeFormatted(data interface{}, hasIndent bool, hasEncode ...bool) {
accept := output.Context.Input.Header("Accept")
switch accept {
case ApplicationYAML:
output.YAML(data)
case ApplicationXML, TextXML:
output.XML(data, hasIndent)
default:
output.JSON(data, hasIndent, len(hasEncode) > 0 && hasEncode[0])
}
}
// Download forces response for download file.
// Prepares the download response header automatically.
func (output *BeegoOutput) Download(file string, filename ...string) {
// check get file error, file not found or other error.
if _, err := os.Stat(file); err != nil {
http.ServeFile(output.Context.ResponseWriter, output.Context.Request, file)
return
}
var fName string
if len(filename) > 0 && filename[0] != "" {
fName = filename[0]
} else {
fName = filepath.Base(file)
}
//https://tools.ietf.org/html/rfc6266#section-4.3
fn := url.PathEscape(fName)
if fName == fn {
fn = "filename=" + fn
} else {
/**
The parameters "filename" and "filename*" differ only in that
"filename*" uses the encoding defined in [RFC5987], allowing the use
of characters not present in the ISO-8859-1 character set
([ISO-8859-1]).
*/
fn = "filename=" + fName + "; filename*=utf-8''" + fn
}
output.Header("Content-Disposition", "attachment; "+fn)
output.Header("Content-Description", "File Transfer")
output.Header("Content-Type", "application/octet-stream")
output.Header("Content-Transfer-Encoding", "binary")
output.Header("Expires", "0")
output.Header("Cache-Control", "must-revalidate")
output.Header("Pragma", "public")
http.ServeFile(output.Context.ResponseWriter, output.Context.Request, file)
}
// ContentType sets the content type from ext string.
// MIME type is given in mime package.
func (output *BeegoOutput) ContentType(ext string) {
if !strings.HasPrefix(ext, ".") {
ext = "." + ext
}
ctype := mime.TypeByExtension(ext)
if ctype != "" {
output.Header("Content-Type", ctype)
}
}
// SetStatus sets the response status code.
// Writes response header directly.
func (output *BeegoOutput) SetStatus(status int) {
output.Status = status
}
// IsCachable returns boolean of if this request is cached.
// HTTP 304 means cached.
func (output *BeegoOutput) IsCachable() bool {
return output.Status >= 200 && output.Status < 300 || output.Status == 304
}
// IsEmpty returns boolean of if this request is empty.
// HTTP 201204 and 304 means empty.
func (output *BeegoOutput) IsEmpty() bool {
return output.Status == 201 || output.Status == 204 || output.Status == 304
}
// IsOk returns boolean of if this request was ok.
// HTTP 200 means ok.
func (output *BeegoOutput) IsOk() bool {
return output.Status == 200
}
// IsSuccessful returns boolean of this request was successful.
// HTTP 2xx means ok.
func (output *BeegoOutput) IsSuccessful() bool {
return output.Status >= 200 && output.Status < 300
}
// IsRedirect returns boolean of if this request is redirected.
// HTTP 301,302,307 means redirection.
func (output *BeegoOutput) IsRedirect() bool {
return output.Status == 301 || output.Status == 302 || output.Status == 303 || output.Status == 307
}
// IsForbidden returns boolean of if this request is forbidden.
// HTTP 403 means forbidden.
func (output *BeegoOutput) IsForbidden() bool {
return output.Status == 403
}
// IsNotFound returns boolean of if this request is not found.
// HTTP 404 means not found.
func (output *BeegoOutput) IsNotFound() bool {
return output.Status == 404
}
// IsClientError returns boolean of if this request client sends error data.
// HTTP 4xx means client error.
func (output *BeegoOutput) IsClientError() bool {
return output.Status >= 400 && output.Status < 500
}
// IsServerError returns boolean of if this server handler errors.
// HTTP 5xx means server internal error.
func (output *BeegoOutput) IsServerError() bool {
return output.Status >= 500 && output.Status < 600
}
func stringsToJSON(str string) string {
var jsons bytes.Buffer
for _, r := range str {
rint := int(r)
if rint < 128 {
jsons.WriteRune(r)
} else {
jsons.WriteString("\\u")
if rint < 0x100 {
jsons.WriteString("00")
} else if rint < 0x1000 {
jsons.WriteString("0")
}
jsons.WriteString(strconv.FormatInt(int64(rint), 16))
}
}
return jsons.String()
}
// Session sets session item value with given key.
func (output *BeegoOutput) Session(name interface{}, value interface{}) {
output.Context.Input.CruSession.Set(nil, name, value)
}