317 lines
8.8 KiB
Go
317 lines
8.8 KiB
Go
// 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"
|
|
"log"
|
|
"math"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/gin-gonic/gin/binding"
|
|
"github.com/gin-gonic/gin/render"
|
|
"github.com/julienschmidt/httprouter"
|
|
)
|
|
|
|
const AbortIndex = math.MaxInt8 / 2
|
|
|
|
// 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 {
|
|
Engine *Engine
|
|
writermem responseWriter
|
|
Request *http.Request
|
|
Writer ResponseWriter
|
|
|
|
Params httprouter.Params
|
|
Input inputHolder
|
|
handlers []HandlerFunc
|
|
index int8
|
|
|
|
Keys map[string]interface{}
|
|
Errors errorMsgs
|
|
accepted []string
|
|
}
|
|
|
|
/************************************/
|
|
/********** CONTEXT CREATION ********/
|
|
/************************************/
|
|
|
|
func (c *Context) reset() {
|
|
c.Keys = nil
|
|
c.index = -1
|
|
c.accepted = nil
|
|
c.Errors = c.Errors[0:0]
|
|
}
|
|
|
|
func (c *Context) Copy() *Context {
|
|
var cp Context = *c
|
|
cp.index = AbortIndex
|
|
cp.handlers = nil
|
|
return &cp
|
|
}
|
|
|
|
/************************************/
|
|
/*************** FLOW ***************/
|
|
/************************************/
|
|
|
|
// Next should be used only in the middlewares.
|
|
// It executes the pending handlers in the chain inside the calling handler.
|
|
// See example in github.
|
|
func (c *Context) Next() {
|
|
c.index++
|
|
s := int8(len(c.handlers))
|
|
for ; c.index < s; c.index++ {
|
|
c.handlers[c.index](c)
|
|
}
|
|
}
|
|
|
|
// Forces the system to not continue calling the pending handlers in the chain.
|
|
func (c *Context) Abort() {
|
|
c.index = AbortIndex
|
|
}
|
|
|
|
// Same than AbortWithStatus() but also writes the specified response status code.
|
|
// For example, the first handler checks if the request is authorized. If it's not, context.AbortWithStatus(401) should be called.
|
|
func (c *Context) AbortWithStatus(code int) {
|
|
c.Writer.WriteHeader(code)
|
|
c.Abort()
|
|
}
|
|
|
|
/************************************/
|
|
/********* ERROR MANAGEMENT *********/
|
|
/************************************/
|
|
|
|
// Fail is the same as Abort plus an error message.
|
|
// Calling `context.Fail(500, err)` is equivalent to:
|
|
// ```
|
|
// context.Error("Operation aborted", err)
|
|
// context.AbortWithStatus(500)
|
|
// ```
|
|
func (c *Context) Fail(code int, err error) {
|
|
c.Error(err, "Operation aborted")
|
|
c.AbortWithStatus(code)
|
|
}
|
|
|
|
func (c *Context) ErrorTyped(err error, typ uint32, meta interface{}) {
|
|
c.Errors = append(c.Errors, errorMsg{
|
|
Err: err.Error(),
|
|
Type: typ,
|
|
Meta: meta,
|
|
})
|
|
}
|
|
|
|
// 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.
|
|
func (c *Context) Error(err error, meta interface{}) {
|
|
c.ErrorTyped(err, ErrorTypeExternal, meta)
|
|
}
|
|
|
|
func (c *Context) LastError() error {
|
|
nuErrors := len(c.Errors)
|
|
if nuErrors > 0 {
|
|
return errors.New(c.Errors[nuErrors-1].Err)
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
/************************************/
|
|
/******** METADATA MANAGEMENT********/
|
|
/************************************/
|
|
|
|
// Sets a new pair key/value just for the specified context.
|
|
// It also lazy initializes the hashmap.
|
|
func (c *Context) Set(key string, item interface{}) {
|
|
if c.Keys == nil {
|
|
c.Keys = make(map[string]interface{})
|
|
}
|
|
c.Keys[key] = item
|
|
}
|
|
|
|
// Get returns the value for the given key or an error if the key does not exist.
|
|
func (c *Context) Get(key string) (value interface{}, ok bool) {
|
|
if c.Keys != nil {
|
|
value, ok = c.Keys[key]
|
|
}
|
|
return
|
|
}
|
|
|
|
// MustGet returns the value for the given key or panics if the value doesn't exist.
|
|
func (c *Context) MustGet(key string) interface{} {
|
|
if value, exists := c.Get(key); exists {
|
|
return value
|
|
} else {
|
|
log.Panicf("Key %s does not exist", key)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
/************************************/
|
|
/********* PARSING REQUEST **********/
|
|
/************************************/
|
|
|
|
func (c *Context) ClientIP() string {
|
|
clientIP := c.Request.Header.Get("X-Real-IP")
|
|
if len(clientIP) > 0 {
|
|
return clientIP
|
|
}
|
|
clientIP = c.Request.Header.Get("X-Forwarded-For")
|
|
clientIP = strings.Split(clientIP, ",")[0]
|
|
if len(clientIP) > 0 {
|
|
return clientIP
|
|
}
|
|
return c.Request.RemoteAddr
|
|
}
|
|
|
|
func (c *Context) ContentType() string {
|
|
return filterFlags(c.Request.Header.Get("Content-Type"))
|
|
}
|
|
|
|
// This function checks the Content-Type to select a binding engine automatically,
|
|
// Depending the "Content-Type" header different bindings are used:
|
|
// "application/json" --> JSON binding
|
|
// "application/xml" --> XML binding
|
|
// else --> returns an error
|
|
// if 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 ParseBody() but this method also writes a 400 error if the json is not valid.
|
|
func (c *Context) Bind(obj interface{}) bool {
|
|
b := binding.Default(c.Request.Method, c.ContentType())
|
|
return c.BindWith(obj, b)
|
|
}
|
|
|
|
func (c *Context) BindWith(obj interface{}, b binding.Binding) bool {
|
|
if err := b.Bind(c.Request, obj); err != nil {
|
|
c.Fail(400, err)
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
/************************************/
|
|
/******** RESPONSE RENDERING ********/
|
|
/************************************/
|
|
|
|
func (c *Context) Render(code int, render render.Render, obj ...interface{}) {
|
|
if err := render.Render(c.Writer, code, obj...); err != nil {
|
|
c.ErrorTyped(err, ErrorTypeInternal, obj)
|
|
c.AbortWithStatus(500)
|
|
}
|
|
}
|
|
|
|
// Serializes the given struct as JSON into the response body in a fast and efficient way.
|
|
// It also sets the Content-Type as "application/json".
|
|
func (c *Context) JSON(code int, obj interface{}) {
|
|
c.Render(code, render.JSON, obj)
|
|
}
|
|
|
|
// Serializes the given struct as XML into the response body in a fast and efficient way.
|
|
// It also sets the Content-Type as "application/xml".
|
|
func (c *Context) XML(code int, obj interface{}) {
|
|
c.Render(code, render.XML, obj)
|
|
}
|
|
|
|
// 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{}) {
|
|
c.Render(code, c.Engine.HTMLRender, name, obj)
|
|
}
|
|
|
|
// Writes the given string into the response body and sets the Content-Type to "text/plain".
|
|
func (c *Context) String(code int, format string, values ...interface{}) {
|
|
c.Render(code, render.Plain, format, values)
|
|
}
|
|
|
|
// Writes the given string into the response body and sets the Content-Type to "text/html" without template.
|
|
func (c *Context) HTMLString(code int, format string, values ...interface{}) {
|
|
c.Render(code, render.HTMLPlain, format, values)
|
|
}
|
|
|
|
// Returns a HTTP redirect to the specific location.
|
|
func (c *Context) Redirect(code int, location string) {
|
|
if code >= 300 && code <= 308 {
|
|
c.Render(code, render.Redirect, location)
|
|
} else {
|
|
log.Panicf("Cannot send a redirect with status code %d", code)
|
|
}
|
|
}
|
|
|
|
// Writes some data into the body stream and updates the HTTP code.
|
|
func (c *Context) Data(code int, contentType string, data []byte) {
|
|
if len(contentType) > 0 {
|
|
c.Writer.Header().Set("Content-Type", contentType)
|
|
}
|
|
c.Writer.WriteHeader(code)
|
|
c.Writer.Write(data)
|
|
}
|
|
|
|
// Writes the specified file into the body stream
|
|
func (c *Context) File(filepath string) {
|
|
http.ServeFile(c.Writer, c.Request, filepath)
|
|
}
|
|
|
|
/************************************/
|
|
/******** CONTENT NEGOTIATION *******/
|
|
/************************************/
|
|
|
|
type Negotiate struct {
|
|
Offered []string
|
|
HTMLPath string
|
|
HTMLData interface{}
|
|
JSONData interface{}
|
|
XMLData interface{}
|
|
Data interface{}
|
|
}
|
|
|
|
func (c *Context) Negotiate(code int, config Negotiate) {
|
|
switch c.NegotiateFormat(config.Offered...) {
|
|
case binding.MIMEJSON:
|
|
data := chooseData(config.JSONData, config.Data)
|
|
c.JSON(code, data)
|
|
|
|
case binding.MIMEHTML:
|
|
if len(config.HTMLPath) == 0 {
|
|
log.Panic("negotiate config is wrong. html path is needed")
|
|
}
|
|
data := chooseData(config.HTMLData, config.Data)
|
|
c.HTML(code, config.HTMLPath, data)
|
|
|
|
case binding.MIMEXML:
|
|
data := chooseData(config.XMLData, config.Data)
|
|
c.XML(code, data)
|
|
|
|
default:
|
|
c.Fail(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server"))
|
|
}
|
|
}
|
|
|
|
func (c *Context) NegotiateFormat(offered ...string) string {
|
|
if len(offered) == 0 {
|
|
log.Panic("you must provide at least one offer")
|
|
}
|
|
if c.accepted == nil {
|
|
c.accepted = parseAccept(c.Request.Header.Get("Accept"))
|
|
}
|
|
if len(c.accepted) == 0 {
|
|
return offered[0]
|
|
|
|
} else {
|
|
for _, accepted := range c.accepted {
|
|
for _, offert := range offered {
|
|
if accepted == offert {
|
|
return offert
|
|
}
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
}
|
|
|
|
func (c *Context) SetAccepted(formats ...string) {
|
|
c.accepted = formats
|
|
}
|