forked from labstack/echo
/
context.go
189 lines (165 loc) · 4.56 KB
/
context.go
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package echo
import (
"encoding/json"
"encoding/xml"
"net/http"
"fmt"
"golang.org/x/net/websocket"
"net/url"
)
type (
// Context represents context for the current request. It holds request and
// response objects, path parameters, data and registered handler.
Context struct {
request *http.Request
response *Response
socket *websocket.Conn
pnames []string
pvalues []string
query url.Values
store store
echo *Echo
}
store map[string]interface{}
)
// NewContext creates a Context object.
func NewContext(req *http.Request, res *Response, e *Echo) *Context {
return &Context{
request: req,
response: res,
echo: e,
pvalues: make([]string, *e.maxParam),
store: make(store),
}
}
// Request returns *http.Request.
func (c *Context) Request() *http.Request {
return c.request
}
// Response returns *Response.
func (c *Context) Response() *Response {
return c.response
}
// Socket returns *websocket.Conn.
func (c *Context) Socket() *websocket.Conn {
return c.socket
}
// P returns path parameter by index.
func (c *Context) P(i int) (value string) {
l := len(c.pnames)
if i < l {
value = c.pvalues[i]
}
return
}
// Param returns path parameter by name.
func (c *Context) Param(name string) (value string) {
l := len(c.pnames)
for i, n := range c.pnames {
if n == name && i < l {
value = c.pvalues[i]
break
}
}
return
}
// Query returns query parameter by name.
func (c *Context) Query(name string) string {
if c.query == nil {
c.query = c.request.URL.Query()
}
return c.query.Get(name)
}
// Form returns form parameter by name.
func (c *Context) Form(name string) string {
return c.request.FormValue(name)
}
// Get retrieves data from the context.
func (c *Context) Get(key string) interface{} {
return c.store[key]
}
// Set saves data in the context.
func (c *Context) Set(key string, val interface{}) {
if c.store == nil {
c.store = make(store)
}
c.store[key] = val
}
// Bind binds the request body into specified type v. Default binder does it
// based on Content-Type header.
func (c *Context) Bind(i interface{}) error {
return c.echo.binder(c.request, i)
}
// Render renders a template with data and sends a text/html response with status
// code. Templates can be registered using `Echo.SetRenderer()`.
func (c *Context) Render(code int, name string, data interface{}) (err error) {
if c.echo.renderer == nil {
return RendererNotRegistered
}
c.response.Header().Set(ContentType, TextHTML)
c.response.WriteHeader(code)
if err = c.echo.renderer.Render(c.response, name, data); err != nil {
c.response.clear()
}
return
}
// HTML formats according to a format specifier and sends text/html response with
// status code.
func (c *Context) HTML(code int, format string, a ...interface{}) (err error) {
c.response.Header().Set(ContentType, TextHTML)
c.response.WriteHeader(code)
if _, err = fmt.Fprintf(c.response, format, a...); err != nil {
c.response.clear()
}
return
}
// String formats according to a format specifier and sends text/plain response
// with status code.
func (c *Context) String(code int, format string, a ...interface{}) (err error) {
c.response.Header().Set(ContentType, TextPlain)
c.response.WriteHeader(code)
if _, err = fmt.Fprintf(c.response, format, a...); err != nil {
c.response.clear()
}
return
}
// JSON sends an application/json response with status code.
func (c *Context) JSON(code int, i interface{}) (err error) {
c.response.Header().Set(ContentType, ApplicationJSON)
c.response.WriteHeader(code)
if err = json.NewEncoder(c.response).Encode(i); err != nil {
c.response.clear()
}
return
}
// XML sends an application/xml response with status code.
func (c *Context) XML(code int, i interface{}) (err error) {
c.response.Header().Set(ContentType, ApplicationXML)
c.response.WriteHeader(code)
c.response.Write([]byte(xml.Header))
if err = xml.NewEncoder(c.response).Encode(i); err != nil {
c.response.clear()
}
return
}
// NoContent sends a response with no body and a status code.
func (c *Context) NoContent(code int) error {
c.response.WriteHeader(code)
return nil
}
// Redirect redirects the request using http.Redirect with status code.
func (c *Context) Redirect(code int, url string) error {
http.Redirect(c.response, c.request, url, code)
return nil
}
// Error invokes the registered HTTP error handler. Generally used by middleware.
func (c *Context) Error(err error) {
c.echo.httpErrorHandler(err, c)
}
func (c *Context) reset(r *http.Request, w http.ResponseWriter, e *Echo) {
c.request = r
c.response.reset(w)
c.query = nil
c.store = nil
c.echo = e
}