264 lines
6.7 KiB
Go
264 lines
6.7 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package context provide the context utils
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// Usage:
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//
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// import "github.com/astaxie/beego/context"
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//
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// ctx := context.Context{Request:req,ResponseWriter:rw}
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//
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// more docs http://beego.me/docs/module/context.md
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package context
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import (
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"bufio"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"errors"
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"fmt"
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"net"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/astaxie/beego/utils"
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)
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//commonly used mime-types
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const (
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ApplicationJSON = "application/json"
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ApplicationXML = "application/xml"
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ApplicationYAML = "application/x-yaml"
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TextXML = "text/xml"
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)
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// NewContext return the Context with Input and Output
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func NewContext() *Context {
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return &Context{
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Input: NewInput(),
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Output: NewOutput(),
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}
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}
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// Context Http request context struct including BeegoInput, BeegoOutput, http.Request and http.ResponseWriter.
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// BeegoInput and BeegoOutput provides some api to operate request and response more easily.
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type Context struct {
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Input *BeegoInput
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Output *BeegoOutput
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Request *http.Request
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ResponseWriter *Response
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_xsrfToken string
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}
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// Reset init Context, BeegoInput and BeegoOutput
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func (ctx *Context) Reset(rw http.ResponseWriter, r *http.Request) {
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ctx.Request = r
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if ctx.ResponseWriter == nil {
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ctx.ResponseWriter = &Response{}
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}
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ctx.ResponseWriter.reset(rw)
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ctx.Input.Reset(ctx)
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ctx.Output.Reset(ctx)
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ctx._xsrfToken = ""
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}
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// Redirect does redirection to localurl with http header status code.
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func (ctx *Context) Redirect(status int, localurl string) {
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http.Redirect(ctx.ResponseWriter, ctx.Request, localurl, status)
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}
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// Abort stops this request.
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// if beego.ErrorMaps exists, panic body.
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func (ctx *Context) Abort(status int, body string) {
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ctx.Output.SetStatus(status)
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panic(body)
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}
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// WriteString Write string to response body.
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// it sends response body.
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func (ctx *Context) WriteString(content string) {
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ctx.ResponseWriter.Write([]byte(content))
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}
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// GetCookie Get cookie from request by a given key.
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// It's alias of BeegoInput.Cookie.
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func (ctx *Context) GetCookie(key string) string {
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return ctx.Input.Cookie(key)
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}
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// SetCookie Set cookie for response.
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// It's alias of BeegoOutput.Cookie.
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func (ctx *Context) SetCookie(name string, value string, others ...interface{}) {
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ctx.Output.Cookie(name, value, others...)
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}
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// GetSecureCookie Get secure cookie from request by a given key.
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func (ctx *Context) GetSecureCookie(Secret, key string) (string, bool) {
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val := ctx.Input.Cookie(key)
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if val == "" {
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return "", false
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}
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parts := strings.SplitN(val, "|", 3)
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if len(parts) != 3 {
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return "", false
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}
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vs := parts[0]
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timestamp := parts[1]
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sig := parts[2]
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h := hmac.New(sha256.New, []byte(Secret))
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fmt.Fprintf(h, "%s%s", vs, timestamp)
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if fmt.Sprintf("%02x", h.Sum(nil)) != sig {
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return "", false
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}
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res, _ := base64.URLEncoding.DecodeString(vs)
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return string(res), true
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}
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// SetSecureCookie Set Secure cookie for response.
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func (ctx *Context) SetSecureCookie(Secret, name, value string, others ...interface{}) {
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vs := base64.URLEncoding.EncodeToString([]byte(value))
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timestamp := strconv.FormatInt(time.Now().UnixNano(), 10)
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h := hmac.New(sha256.New, []byte(Secret))
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fmt.Fprintf(h, "%s%s", vs, timestamp)
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sig := fmt.Sprintf("%02x", h.Sum(nil))
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cookie := strings.Join([]string{vs, timestamp, sig}, "|")
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ctx.Output.Cookie(name, cookie, others...)
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}
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// XSRFToken creates a xsrf token string and returns.
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func (ctx *Context) XSRFToken(key string, expire int64) string {
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if ctx._xsrfToken == "" {
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token, ok := ctx.GetSecureCookie(key, "_xsrf")
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if !ok {
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token = string(utils.RandomCreateBytes(32))
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ctx.SetSecureCookie(key, "_xsrf", token, expire)
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}
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ctx._xsrfToken = token
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}
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return ctx._xsrfToken
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}
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// CheckXSRFCookie checks xsrf token in this request is valid or not.
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// the token can provided in request header "X-Xsrftoken" and "X-CsrfToken"
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// or in form field value named as "_xsrf".
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func (ctx *Context) CheckXSRFCookie() bool {
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token := ctx.Input.Query("_xsrf")
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if token == "" {
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token = ctx.Request.Header.Get("X-Xsrftoken")
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}
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if token == "" {
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token = ctx.Request.Header.Get("X-Csrftoken")
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}
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if token == "" {
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ctx.Abort(422, "422")
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return false
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}
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if ctx._xsrfToken != token {
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ctx.Abort(417, "417")
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return false
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}
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return true
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}
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// RenderMethodResult renders the return value of a controller method to the output
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func (ctx *Context) RenderMethodResult(result interface{}) {
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if result != nil {
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renderer, ok := result.(Renderer)
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if !ok {
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err, ok := result.(error)
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if ok {
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renderer = errorRenderer(err)
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} else {
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renderer = jsonRenderer(result)
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}
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}
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renderer.Render(ctx)
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}
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}
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//Response is a wrapper for the http.ResponseWriter
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//started set to true if response was written to then don't execute other handler
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type Response struct {
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http.ResponseWriter
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Started bool
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Status int
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Elapsed time.Duration
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}
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func (r *Response) reset(rw http.ResponseWriter) {
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r.ResponseWriter = rw
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r.Status = 0
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r.Started = false
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}
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// Write writes the data to the connection as part of an HTTP reply,
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// and sets `started` to true.
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// started means the response has sent out.
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func (r *Response) Write(p []byte) (int, error) {
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r.Started = true
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return r.ResponseWriter.Write(p)
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}
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// WriteHeader sends an HTTP response header with status code,
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// and sets `started` to true.
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func (r *Response) WriteHeader(code int) {
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if r.Status > 0 {
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//prevent multiple response.WriteHeader calls
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return
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}
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r.Status = code
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r.Started = true
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r.ResponseWriter.WriteHeader(code)
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}
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// Hijack hijacker for http
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func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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hj, ok := r.ResponseWriter.(http.Hijacker)
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if !ok {
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return nil, nil, errors.New("webserver doesn't support hijacking")
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}
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return hj.Hijack()
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}
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// Flush http.Flusher
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func (r *Response) Flush() {
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if f, ok := r.ResponseWriter.(http.Flusher); ok {
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f.Flush()
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}
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}
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// CloseNotify http.CloseNotifier
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func (r *Response) CloseNotify() <-chan bool {
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if cn, ok := r.ResponseWriter.(http.CloseNotifier); ok {
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return cn.CloseNotify()
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}
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return nil
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}
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// Pusher http.Pusher
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func (r *Response) Pusher() (pusher http.Pusher) {
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if pusher, ok := r.ResponseWriter.(http.Pusher); ok {
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return pusher
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}
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return nil
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}
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