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Copy pathcontext.go
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1173 lines (1022 loc) · 36.1 KB
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// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package gin
import (
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"mime/multipart"
"net"
"net/http"
"net/url"
"os"
"strings"
"sync"
"time"
"github.com/gin-contrib/sse"
"github.com/gin-gonic/gin/binding"
"github.com/gin-gonic/gin/render"
)
// Content-Type MIME of the most common data formats.
const (
MIMEJSON = binding.MIMEJSON
MIMEHTML = binding.MIMEHTML
MIMEXML = binding.MIMEXML
MIMEXML2 = binding.MIMEXML2
MIMEPlain = binding.MIMEPlain
MIMEPOSTForm = binding.MIMEPOSTForm
MIMEMultipartPOSTForm = binding.MIMEMultipartPOSTForm
MIMEYAML = binding.MIMEYAML
)
// BodyBytesKey indicates a default body bytes key.
const BodyBytesKey = "_gin-gonic/gin/bodybyteskey"
// abortIndex represents a typical value used in abort functions.
const abortIndex int8 = math.MaxInt8 >> 1
// Context is the most important part of gin. It allows us to pass variables between middleware,
// manage the flow, validate the JSON of a request and render a JSON response for example.
type Context struct {
writermem responseWriter
Request *http.Request
Writer ResponseWriter
Params Params
handlers HandlersChain
index int8
fullPath string
engine *Engine
params *Params
skippedNodes *[]skippedNode
// This mutex protect Keys map
mu sync.RWMutex
// Keys is a key/value pair exclusively for the context of each request.
Keys map[string]interface{}
// Errors is a list of errors attached to all the handlers/middlewares who used this context.
Errors errorMsgs
// Accepted defines a list of manually accepted formats for content negotiation.
Accepted []string
// queryCache use url.ParseQuery cached the param query result from c.Request.URL.Query()
queryCache url.Values
// formCache use url.ParseQuery cached PostForm contains the parsed form data from POST, PATCH,
// or PUT body parameters.
formCache url.Values
// SameSite allows a server to define a cookie attribute making it impossible for
// the browser to send this cookie along with cross-site requests.
sameSite http.SameSite
}
/************************************/
/********** CONTEXT CREATION ********/
/************************************/
func (c *Context) reset() {
c.Writer = &c.writermem
c.Params = c.Params[:0]
c.handlers = nil
c.index = -1
c.fullPath = ""
c.Keys = nil
c.Errors = c.Errors[:0]
c.Accepted = nil
c.queryCache = nil
c.formCache = nil
*c.params = (*c.params)[:0]
*c.skippedNodes = (*c.skippedNodes)[:0]
}
// Copy returns a copy of the current context that can be safely used outside the request's scope.
// This has to be used when the context has to be passed to a goroutine.
func (c *Context) Copy() *Context {
cp := Context{
writermem: c.writermem,
Request: c.Request,
Params: c.Params,
engine: c.engine,
}
cp.writermem.ResponseWriter = nil
cp.Writer = &cp.writermem
cp.index = abortIndex
cp.handlers = nil
cp.Keys = map[string]interface{}{}
for k, v := range c.Keys {
cp.Keys[k] = v
}
paramCopy := make([]Param, len(cp.Params))
copy(paramCopy, cp.Params)
cp.Params = paramCopy
return &cp
}
// HandlerName returns the main handler's name. For example if the handler is "handleGetUsers()",
// this function will return "main.handleGetUsers".
func (c *Context) HandlerName() string {
return nameOfFunction(c.handlers.Last())
}
// HandlerNames returns a list of all registered handlers for this context in descending order,
// following the semantics of HandlerName()
func (c *Context) HandlerNames() []string {
hn := make([]string, 0, len(c.handlers))
for _, val := range c.handlers {
hn = append(hn, nameOfFunction(val))
}
return hn
}
// Handler returns the main handler.
func (c *Context) Handler() HandlerFunc {
return c.handlers.Last()
}
// FullPath returns a matched route full path. For not found routes
// returns an empty string.
// router.GET("/user/:id", func(c *gin.Context) {
// c.FullPath() == "/user/:id" // true
// })
func (c *Context) FullPath() string {
return c.fullPath
}
/************************************/
/*********** FLOW CONTROL ***********/
/************************************/
// Next should be used only inside middleware.
// It executes the pending handlers in the chain inside the calling handler.
// See example in GitHub.
func (c *Context) Next() {
c.index++
for c.index < int8(len(c.handlers)) {
c.handlers[c.index](c)
c.index++
}
}
// IsAborted returns true if the current context was aborted.
func (c *Context) IsAborted() bool {
return c.index >= abortIndex
}
// Abort prevents pending handlers from being called. Note that this will not stop the current handler.
// Let's say you have an authorization middleware that validates that the current request is authorized.
// If the authorization fails (ex: the password does not match), call Abort to ensure the remaining handlers
// for this request are not called.
func (c *Context) Abort() {
c.index = abortIndex
}
// AbortWithStatus calls `Abort()` and writes the headers with the specified status code.
// For example, a failed attempt to authenticate a request could use: context.AbortWithStatus(401).
func (c *Context) AbortWithStatus(code int) {
c.Status(code)
c.Writer.WriteHeaderNow()
c.Abort()
}
// AbortWithStatusJSON calls `Abort()` and then `JSON` internally.
// This method stops the chain, writes the status code and return a JSON body.
// It also sets the Content-Type as "application/json".
func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{}) {
c.Abort()
c.JSON(code, jsonObj)
}
// AbortWithError calls `AbortWithStatus()` and `Error()` internally.
// This method stops the chain, writes the status code and pushes the specified error to `c.Errors`.
// See Context.Error() for more details.
func (c *Context) AbortWithError(code int, err error) *Error {
c.AbortWithStatus(code)
return c.Error(err)
}
/************************************/
/********* ERROR MANAGEMENT *********/
/************************************/
// Error attaches an error to the current context. The error is pushed to a list of errors.
// It's a good idea to call Error for each error that occurred during the resolution of a request.
// A middleware can be used to collect all the errors and push them to a database together,
// print a log, or append it in the HTTP response.
// Error will panic if err is nil.
func (c *Context) Error(err error) *Error {
if err == nil {
panic("err is nil")
}
var parsedError *Error
ok := errors.As(err, &parsedError)
if !ok {
parsedError = &Error{
Err: err,
Type: ErrorTypePrivate,
}
}
c.Errors = append(c.Errors, parsedError)
return parsedError
}
/************************************/
/******** METADATA MANAGEMENT********/
/************************************/
// Set is used to store a new key/value pair exclusively for this context.
// It also lazy initializes c.Keys if it was not used previously.
func (c *Context) Set(key string, value interface{}) {
c.mu.Lock()
if c.Keys == nil {
c.Keys = make(map[string]interface{})
}
c.Keys[key] = value
c.mu.Unlock()
}
// Get returns the value for the given key, ie: (value, true).
// If the value does not exist it returns (nil, false)
func (c *Context) Get(key string) (value interface{}, exists bool) {
c.mu.RLock()
value, exists = c.Keys[key]
c.mu.RUnlock()
return
}
// MustGet returns the value for the given key if it exists, otherwise it panics.
func (c *Context) MustGet(key string) interface{} {
if value, exists := c.Get(key); exists {
return value
}
panic("Key \"" + key + "\" does not exist")
}
// GetString returns the value associated with the key as a string.
func (c *Context) GetString(key string) (s string) {
if val, ok := c.Get(key); ok && val != nil {
s, _ = val.(string)
}
return
}
// GetBool returns the value associated with the key as a boolean.
func (c *Context) GetBool(key string) (b bool) {
if val, ok := c.Get(key); ok && val != nil {
b, _ = val.(bool)
}
return
}
// GetInt returns the value associated with the key as an integer.
func (c *Context) GetInt(key string) (i int) {
if val, ok := c.Get(key); ok && val != nil {
i, _ = val.(int)
}
return
}
// GetInt64 returns the value associated with the key as an integer.
func (c *Context) GetInt64(key string) (i64 int64) {
if val, ok := c.Get(key); ok && val != nil {
i64, _ = val.(int64)
}
return
}
// GetUint returns the value associated with the key as an unsigned integer.
func (c *Context) GetUint(key string) (ui uint) {
if val, ok := c.Get(key); ok && val != nil {
ui, _ = val.(uint)
}
return
}
// GetUint64 returns the value associated with the key as an unsigned integer.
func (c *Context) GetUint64(key string) (ui64 uint64) {
if val, ok := c.Get(key); ok && val != nil {
ui64, _ = val.(uint64)
}
return
}
// GetFloat64 returns the value associated with the key as a float64.
func (c *Context) GetFloat64(key string) (f64 float64) {
if val, ok := c.Get(key); ok && val != nil {
f64, _ = val.(float64)
}
return
}
// GetTime returns the value associated with the key as time.
func (c *Context) GetTime(key string) (t time.Time) {
if val, ok := c.Get(key); ok && val != nil {
t, _ = val.(time.Time)
}
return
}
// GetDuration returns the value associated with the key as a duration.
func (c *Context) GetDuration(key string) (d time.Duration) {
if val, ok := c.Get(key); ok && val != nil {
d, _ = val.(time.Duration)
}
return
}
// GetStringSlice returns the value associated with the key as a slice of strings.
func (c *Context) GetStringSlice(key string) (ss []string) {
if val, ok := c.Get(key); ok && val != nil {
ss, _ = val.([]string)
}
return
}
// GetStringMap returns the value associated with the key as a map of interfaces.
func (c *Context) GetStringMap(key string) (sm map[string]interface{}) {
if val, ok := c.Get(key); ok && val != nil {
sm, _ = val.(map[string]interface{})
}
return
}
// GetStringMapString returns the value associated with the key as a map of strings.
func (c *Context) GetStringMapString(key string) (sms map[string]string) {
if val, ok := c.Get(key); ok && val != nil {
sms, _ = val.(map[string]string)
}
return
}
// GetStringMapStringSlice returns the value associated with the key as a map to a slice of strings.
func (c *Context) GetStringMapStringSlice(key string) (smss map[string][]string) {
if val, ok := c.Get(key); ok && val != nil {
smss, _ = val.(map[string][]string)
}
return
}
/************************************/
/************ INPUT DATA ************/
/************************************/
// Param returns the value of the URL param.
// It is a shortcut for c.Params.ByName(key)
// router.GET("/user/:id", func(c *gin.Context) {
// // a GET request to /user/john
// id := c.Param("id") // id == "john"
// })
func (c *Context) Param(key string) string {
return c.Params.ByName(key)
}
// AddParam adds param to context and
// replaces path param key with given value for e2e testing purposes
// Example Route: "/user/:id"
// AddParam("id", 1)
// Result: "/user/1"
func (c *Context) AddParam(key, value string) {
c.Params = append(c.Params, Param{Key: key, Value: value})
}
// Query returns the keyed url query value if it exists,
// otherwise it returns an empty string `("")`.
// It is shortcut for `c.Request.URL.Query().Get(key)`
// GET /path?id=1234&name=Manu&value=
// c.Query("id") == "1234"
// c.Query("name") == "Manu"
// c.Query("value") == ""
// c.Query("wtf") == ""
func (c *Context) Query(key string) (value string) {
value, _ = c.GetQuery(key)
return
}
// DefaultQuery returns the keyed url query value if it exists,
// otherwise it returns the specified defaultValue string.
// See: Query() and GetQuery() for further information.
// GET /?name=Manu&lastname=
// c.DefaultQuery("name", "unknown") == "Manu"
// c.DefaultQuery("id", "none") == "none"
// c.DefaultQuery("lastname", "none") == ""
func (c *Context) DefaultQuery(key, defaultValue string) string {
if value, ok := c.GetQuery(key); ok {
return value
}
return defaultValue
}
// GetQuery is like Query(), it returns the keyed url query value
// if it exists `(value, true)` (even when the value is an empty string),
// otherwise it returns `("", false)`.
// It is shortcut for `c.Request.URL.Query().Get(key)`
// GET /?name=Manu&lastname=
// ("Manu", true) == c.GetQuery("name")
// ("", false) == c.GetQuery("id")
// ("", true) == c.GetQuery("lastname")
func (c *Context) GetQuery(key string) (string, bool) {
if values, ok := c.GetQueryArray(key); ok {
return values[0], ok
}
return "", false
}
// QueryArray returns a slice of strings for a given query key.
// The length of the slice depends on the number of params with the given key.
func (c *Context) QueryArray(key string) (values []string) {
values, _ = c.GetQueryArray(key)
return
}
func (c *Context) initQueryCache() {
if c.queryCache == nil {
if c.Request != nil {
c.queryCache = c.Request.URL.Query()
} else {
c.queryCache = url.Values{}
}
}
}
// GetQueryArray returns a slice of strings for a given query key, plus
// a boolean value whether at least one value exists for the given key.
func (c *Context) GetQueryArray(key string) (values []string, ok bool) {
c.initQueryCache()
values, ok = c.queryCache[key]
return
}
// QueryMap returns a map for a given query key.
func (c *Context) QueryMap(key string) (dicts map[string]string) {
dicts, _ = c.GetQueryMap(key)
return
}
// GetQueryMap returns a map for a given query key, plus a boolean value
// whether at least one value exists for the given key.
func (c *Context) GetQueryMap(key string) (map[string]string, bool) {
c.initQueryCache()
return c.get(c.queryCache, key)
}
// PostForm returns the specified key from a POST urlencoded form or multipart form
// when it exists, otherwise it returns an empty string `("")`.
func (c *Context) PostForm(key string) (value string) {
value, _ = c.GetPostForm(key)
return
}
// DefaultPostForm returns the specified key from a POST urlencoded form or multipart form
// when it exists, otherwise it returns the specified defaultValue string.
// See: PostForm() and GetPostForm() for further information.
func (c *Context) DefaultPostForm(key, defaultValue string) string {
if value, ok := c.GetPostForm(key); ok {
return value
}
return defaultValue
}
// GetPostForm is like PostForm(key). It returns the specified key from a POST urlencoded
// form or multipart form when it exists `(value, true)` (even when the value is an empty string),
// otherwise it returns ("", false).
// For example, during a PATCH request to update the user's email:
// email=mail@example.com --> ("mail@example.com", true) := GetPostForm("email") // set email to "mail@example.com"
// email= --> ("", true) := GetPostForm("email") // set email to ""
// --> ("", false) := GetPostForm("email") // do nothing with email
func (c *Context) GetPostForm(key string) (string, bool) {
if values, ok := c.GetPostFormArray(key); ok {
return values[0], ok
}
return "", false
}
// PostFormArray returns a slice of strings for a given form key.
// The length of the slice depends on the number of params with the given key.
func (c *Context) PostFormArray(key string) (values []string) {
values, _ = c.GetPostFormArray(key)
return
}
func (c *Context) initFormCache() {
if c.formCache == nil {
c.formCache = make(url.Values)
req := c.Request
if err := req.ParseMultipartForm(c.engine.MaxMultipartMemory); err != nil {
if !errors.Is(err, http.ErrNotMultipart) {
debugPrint("error on parse multipart form array: %v", err)
}
}
c.formCache = req.PostForm
}
}
// GetPostFormArray returns a slice of strings for a given form key, plus
// a boolean value whether at least one value exists for the given key.
func (c *Context) GetPostFormArray(key string) (values []string, ok bool) {
c.initFormCache()
values, ok = c.formCache[key]
return
}
// PostFormMap returns a map for a given form key.
func (c *Context) PostFormMap(key string) (dicts map[string]string) {
dicts, _ = c.GetPostFormMap(key)
return
}
// GetPostFormMap returns a map for a given form key, plus a boolean value
// whether at least one value exists for the given key.
func (c *Context) GetPostFormMap(key string) (map[string]string, bool) {
c.initFormCache()
return c.get(c.formCache, key)
}
// get is an internal method and returns a map which satisfy conditions.
func (c *Context) get(m map[string][]string, key string) (map[string]string, bool) {
dicts := make(map[string]string)
exist := false
for k, v := range m {
if i := strings.IndexByte(k, '['); i >= 1 && k[0:i] == key {
if j := strings.IndexByte(k[i+1:], ']'); j >= 1 {
exist = true
dicts[k[i+1:][:j]] = v[0]
}
}
}
return dicts, exist
}
// FormFile returns the first file for the provided form key.
func (c *Context) FormFile(name string) (*multipart.FileHeader, error) {
if c.Request.MultipartForm == nil {
if err := c.Request.ParseMultipartForm(c.engine.MaxMultipartMemory); err != nil {
return nil, err
}
}
f, fh, err := c.Request.FormFile(name)
if err != nil {
return nil, err
}
f.Close()
return fh, err
}
// MultipartForm is the parsed multipart form, including file uploads.
func (c *Context) MultipartForm() (*multipart.Form, error) {
err := c.Request.ParseMultipartForm(c.engine.MaxMultipartMemory)
return c.Request.MultipartForm, err
}
// SaveUploadedFile uploads the form file to specific dst.
func (c *Context) SaveUploadedFile(file *multipart.FileHeader, dst string) error {
src, err := file.Open()
if err != nil {
return err
}
defer src.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, src)
return err
}
// Bind checks the Content-Type to select a binding engine automatically,
// Depending on the "Content-Type" header different bindings are used:
// "application/json" --> JSON binding
// "application/xml" --> XML binding
// otherwise --> returns an error.
// It parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input.
// It decodes the json payload into the struct specified as a pointer.
// It writes a 400 error and sets Content-Type header "text/plain" in the response if input is not valid.
func (c *Context) Bind(obj interface{}) error {
b := binding.Default(c.Request.Method, c.ContentType())
return c.MustBindWith(obj, b)
}
// BindJSON is a shortcut for c.MustBindWith(obj, binding.JSON).
func (c *Context) BindJSON(obj interface{}) error {
return c.MustBindWith(obj, binding.JSON)
}
// BindXML is a shortcut for c.MustBindWith(obj, binding.BindXML).
func (c *Context) BindXML(obj interface{}) error {
return c.MustBindWith(obj, binding.XML)
}
// BindQuery is a shortcut for c.MustBindWith(obj, binding.Query).
func (c *Context) BindQuery(obj interface{}) error {
return c.MustBindWith(obj, binding.Query)
}
// BindYAML is a shortcut for c.MustBindWith(obj, binding.YAML).
func (c *Context) BindYAML(obj interface{}) error {
return c.MustBindWith(obj, binding.YAML)
}
// BindHeader is a shortcut for c.MustBindWith(obj, binding.Header).
func (c *Context) BindHeader(obj interface{}) error {
return c.MustBindWith(obj, binding.Header)
}
// BindUri binds the passed struct pointer using binding.Uri.
// It will abort the request with HTTP 400 if any error occurs.
func (c *Context) BindUri(obj interface{}) error {
if err := c.ShouldBindUri(obj); err != nil {
c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
return err
}
return nil
}
// MustBindWith binds the passed struct pointer using the specified binding engine.
// It will abort the request with HTTP 400 if any error occurs.
// See the binding package.
func (c *Context) MustBindWith(obj interface{}, b binding.Binding) error {
if err := c.ShouldBindWith(obj, b); err != nil {
c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
return err
}
return nil
}
// ShouldBind checks the Content-Type to select a binding engine automatically,
// Depending on the "Content-Type" header different bindings are used:
// "application/json" --> JSON binding
// "application/xml" --> XML binding
// otherwise --> returns an error
// It parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input.
// It decodes the json payload into the struct specified as a pointer.
// Like c.Bind() but this method does not set the response status code to 400 and abort if the json is not valid.
func (c *Context) ShouldBind(obj interface{}) error {
b := binding.Default(c.Request.Method, c.ContentType())
return c.ShouldBindWith(obj, b)
}
// ShouldBindJSON is a shortcut for c.ShouldBindWith(obj, binding.JSON).
func (c *Context) ShouldBindJSON(obj interface{}) error {
return c.ShouldBindWith(obj, binding.JSON)
}
// ShouldBindXML is a shortcut for c.ShouldBindWith(obj, binding.XML).
func (c *Context) ShouldBindXML(obj interface{}) error {
return c.ShouldBindWith(obj, binding.XML)
}
// ShouldBindQuery is a shortcut for c.ShouldBindWith(obj, binding.Query).
func (c *Context) ShouldBindQuery(obj interface{}) error {
return c.ShouldBindWith(obj, binding.Query)
}
// ShouldBindYAML is a shortcut for c.ShouldBindWith(obj, binding.YAML).
func (c *Context) ShouldBindYAML(obj interface{}) error {
return c.ShouldBindWith(obj, binding.YAML)
}
// ShouldBindHeader is a shortcut for c.ShouldBindWith(obj, binding.Header).
func (c *Context) ShouldBindHeader(obj interface{}) error {
return c.ShouldBindWith(obj, binding.Header)
}
// ShouldBindUri binds the passed struct pointer using the specified binding engine.
func (c *Context) ShouldBindUri(obj interface{}) error {
m := make(map[string][]string)
for _, v := range c.Params {
m[v.Key] = []string{v.Value}
}
return binding.Uri.BindUri(m, obj)
}
// ShouldBindWith binds the passed struct pointer using the specified binding engine.
// See the binding package.
func (c *Context) ShouldBindWith(obj interface{}, b binding.Binding) error {
return b.Bind(c.Request, obj)
}
// ShouldBindBodyWith is similar with ShouldBindWith, but it stores the request
// body into the context, and reuse when it is called again.
//
// NOTE: This method reads the body before binding. So you should use
// ShouldBindWith for better performance if you need to call only once.
func (c *Context) ShouldBindBodyWith(obj interface{}, bb binding.BindingBody) (err error) {
var body []byte
if cb, ok := c.Get(BodyBytesKey); ok {
if cbb, ok := cb.([]byte); ok {
body = cbb
}
}
if body == nil {
body, err = ioutil.ReadAll(c.Request.Body)
if err != nil {
return err
}
c.Set(BodyBytesKey, body)
}
return bb.BindBody(body, obj)
}
// ClientIP implements one best effort algorithm to return the real client IP.
// It called c.RemoteIP() under the hood, to check if the remote IP is a trusted proxy or not.
// If it is it will then try to parse the headers defined in Engine.RemoteIPHeaders (defaulting to [X-Forwarded-For, X-Real-Ip]).
// If the headers are not syntactically valid OR the remote IP does not correspond to a trusted proxy,
// the remote IP (coming from Request.RemoteAddr) is returned.
func (c *Context) ClientIP() string {
// Check if we're running on a trusted platform, continue running backwards if error
if c.engine.TrustedPlatform != "" {
// Developers can define their own header of Trusted Platform or use predefined constants
if addr := c.requestHeader(c.engine.TrustedPlatform); addr != "" {
return addr
}
}
// Legacy "AppEngine" flag
if c.engine.AppEngine {
log.Println(`The AppEngine flag is going to be deprecated. Please check issues #2723 and #2739 and use 'TrustedPlatform: gin.PlatformGoogleAppEngine' instead.`)
if addr := c.requestHeader("X-Appengine-Remote-Addr"); addr != "" {
return addr
}
}
// It also checks if the remoteIP is a trusted proxy or not.
// In order to perform this validation, it will see if the IP is contained within at least one of the CIDR blocks
// defined by Engine.SetTrustedProxies()
remoteIP := net.ParseIP(c.RemoteIP())
if remoteIP == nil {
return ""
}
trusted := c.engine.isTrustedProxy(remoteIP)
if trusted && c.engine.ForwardedByClientIP && c.engine.RemoteIPHeaders != nil {
for _, headerName := range c.engine.RemoteIPHeaders {
ip, valid := c.engine.validateHeader(c.requestHeader(headerName))
if valid {
return ip
}
}
}
return remoteIP.String()
}
// RemoteIP parses the IP from Request.RemoteAddr, normalizes and returns the IP (without the port).
func (c *Context) RemoteIP() string {
ip, _, err := net.SplitHostPort(strings.TrimSpace(c.Request.RemoteAddr))
if err != nil {
return ""
}
return ip
}
// ContentType returns the Content-Type header of the request.
func (c *Context) ContentType() string {
return filterFlags(c.requestHeader("Content-Type"))
}
// IsWebsocket returns true if the request headers indicate that a websocket
// handshake is being initiated by the client.
func (c *Context) IsWebsocket() bool {
if strings.Contains(strings.ToLower(c.requestHeader("Connection")), "upgrade") &&
strings.EqualFold(c.requestHeader("Upgrade"), "websocket") {
return true
}
return false
}
func (c *Context) requestHeader(key string) string {
return c.Request.Header.Get(key)
}
/************************************/
/******** RESPONSE RENDERING ********/
/************************************/
// bodyAllowedForStatus is a copy of http.bodyAllowedForStatus non-exported function.
func bodyAllowedForStatus(status int) bool {
switch {
case status >= 100 && status <= 199:
return false
case status == http.StatusNoContent:
return false
case status == http.StatusNotModified:
return false
}
return true
}
// Status sets the HTTP response code.
func (c *Context) Status(code int) {
c.Writer.WriteHeader(code)
}
// Header is an intelligent shortcut for c.Writer.Header().Set(key, value).
// It writes a header in the response.
// If value == "", this method removes the header `c.Writer.Header().Del(key)`
func (c *Context) Header(key, value string) {
if value == "" {
c.Writer.Header().Del(key)
return
}
c.Writer.Header().Set(key, value)
}
// GetHeader returns value from request headers.
func (c *Context) GetHeader(key string) string {
return c.requestHeader(key)
}
// GetRawData return stream data.
func (c *Context) GetRawData() ([]byte, error) {
return ioutil.ReadAll(c.Request.Body)
}
// SetSameSite with cookie
func (c *Context) SetSameSite(samesite http.SameSite) {
c.sameSite = samesite
}
// SetCookie adds a Set-Cookie header to the ResponseWriter's headers.
// The provided cookie must have a valid Name. Invalid cookies may be
// silently dropped.
func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool) {
if path == "" {
path = "/"
}
http.SetCookie(c.Writer, &http.Cookie{
Name: name,
Value: url.QueryEscape(value),
MaxAge: maxAge,
Path: path,
Domain: domain,
SameSite: c.sameSite,
Secure: secure,
HttpOnly: httpOnly,
})
}
// Cookie returns the named cookie provided in the request or
// ErrNoCookie if not found. And return the named cookie is unescaped.
// If multiple cookies match the given name, only one cookie will
// be returned.
func (c *Context) Cookie(name string) (string, error) {
cookie, err := c.Request.Cookie(name)
if err != nil {
return "", err
}
val, _ := url.QueryUnescape(cookie.Value)
return val, nil
}
// Render writes the response headers and calls render.Render to render data.
func (c *Context) Render(code int, r render.Render) {
c.Status(code)
if !bodyAllowedForStatus(code) {
r.WriteContentType(c.Writer)
c.Writer.WriteHeaderNow()
return
}
if err := r.Render(c.Writer); err != nil {
panic(err)
}
}
// HTML renders the HTTP template specified by its file name.
// It also updates the HTTP code and sets the Content-Type as "text/html".
// See http://golang.org/doc/articles/wiki/
func (c *Context) HTML(code int, name string, obj interface{}) {
instance := c.engine.HTMLRender.Instance(name, obj)
c.Render(code, instance)
}
// IndentedJSON serializes the given struct as pretty JSON (indented + endlines) into the response body.
// It also sets the Content-Type as "application/json".
// WARNING: we recommend using this only for development purposes since printing pretty JSON is
// more CPU and bandwidth consuming. Use Context.JSON() instead.
func (c *Context) IndentedJSON(code int, obj interface{}) {
c.Render(code, render.IndentedJSON{Data: obj})
}
// SecureJSON serializes the given struct as Secure JSON into the response body.
// Default prepends "while(1)," to response body if the given struct is array values.
// It also sets the Content-Type as "application/json".
func (c *Context) SecureJSON(code int, obj interface{}) {
c.Render(code, render.SecureJSON{Prefix: c.engine.secureJSONPrefix, Data: obj})
}
// JSONP serializes the given struct as JSON into the response body.
// It adds padding to response body to request data from a server residing in a different domain than the client.
// It also sets the Content-Type as "application/javascript".
func (c *Context) JSONP(code int, obj interface{}) {
callback := c.DefaultQuery("callback", "")
if callback == "" {
c.Render(code, render.JSON{Data: obj})
return
}
c.Render(code, render.JsonpJSON{Callback: callback, Data: obj})
}
// JSON serializes the given struct as JSON into the response body.
// It also sets the Content-Type as "application/json".
func (c *Context) JSON(code int, obj interface{}) {
c.Render(code, render.JSON{Data: obj})
}
// AsciiJSON serializes the given struct as JSON into the response body with unicode to ASCII string.
// It also sets the Content-Type as "application/json".
func (c *Context) AsciiJSON(code int, obj interface{}) {
c.Render(code, render.AsciiJSON{Data: obj})
}
// PureJSON serializes the given struct as JSON into the response body.
// PureJSON, unlike JSON, does not replace special html characters with their unicode entities.
func (c *Context) PureJSON(code int, obj interface{}) {
c.Render(code, render.PureJSON{Data: obj})
}
// XML serializes the given struct as XML into the response body.
// It also sets the Content-Type as "application/xml".
func (c *Context) XML(code int, obj interface{}) {
c.Render(code, render.XML{Data: obj})
}
// YAML serializes the given struct as YAML into the response body.
func (c *Context) YAML(code int, obj interface{}) {
c.Render(code, render.YAML{Data: obj})
}
// ProtoBuf serializes the given struct as ProtoBuf into the response body.
func (c *Context) ProtoBuf(code int, obj interface{}) {
c.Render(code, render.ProtoBuf{Data: obj})
}
// String writes the given string into the response body.
func (c *Context) String(code int, format string, values ...interface{}) {
c.Render(code, render.String{Format: format, Data: values})
}
// Redirect returns an HTTP redirect to the specific location.
func (c *Context) Redirect(code int, location string) {
c.Render(-1, render.Redirect{
Code: code,
Location: location,
Request: c.Request,
})
}
// Data writes some data into the body stream and updates the HTTP code.
func (c *Context) Data(code int, contentType string, data []byte) {
c.Render(code, render.Data{
ContentType: contentType,
Data: data,
})
}
// DataFromReader writes the specified reader into the body stream and updates the HTTP code.
func (c *Context) DataFromReader(code int, contentLength int64, contentType string, reader io.Reader, extraHeaders map[string]string) {
c.Render(code, render.Reader{
Headers: extraHeaders,
ContentType: contentType,
ContentLength: contentLength,
Reader: reader,