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context.go
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context.go
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package echo
import (
"encoding/json"
"net/http"
"strings"
)
type (
// Context represents context for the current request. It holds request and
// response references, path parameters, data and registered handler.
Context struct {
Request *http.Request
Response *response
params Params
store store
echo *Echo
}
store map[string]interface{}
)
// P returns path parameter by index.
func (c *Context) P(i uint8) string {
return c.params[i].Value
}
// Param returns path parameter by name.
func (c *Context) Param(name string) (value string) {
for _, p := range c.params {
if p.Name == name {
value = p.Value
}
}
return
}
// Bind decodes the body into provided type based on Content-Type header.
func (c *Context) Bind(v interface{}) error {
ct := c.Request.Header.Get(HeaderContentType)
if strings.HasPrefix(ct, MIMEJSON) {
return json.NewDecoder(c.Request.Body).Decode(v)
} else if strings.HasPrefix(ct, MIMEForm) {
return nil
}
return ErrUnsupportedMediaType
}
// Render calls the registered HTML template renderer and sends a text/html
// response.
func (c *Context) Render(name string, data interface{}) error {
if c.echo.renderer == nil {
return ErrNoRenderer
}
c.Response.Header().Set(HeaderContentType, MIMEHTML+"; charset=utf-8")
c.Response.WriteHeader(http.StatusOK)
return c.echo.renderer.Render(c.Response, name, data)
}
// JSON sends an application/json response with status code.
func (c *Context) JSON(code int, v interface{}) error {
c.Response.Header().Set(HeaderContentType, MIMEJSON+"; charset=utf-8")
c.Response.WriteHeader(code)
return json.NewEncoder(c.Response).Encode(v)
}
// String sends a text/plain response with status code.
func (c *Context) String(code int, s string) (err error) {
c.Response.Header().Set(HeaderContentType, MIMEText+"; charset=utf-8")
c.Response.WriteHeader(code)
_, err = c.Response.Write([]byte(s))
return
}
// HTML sends a text/html response with status code.
func (c *Context) HTML(code int, html string) (err error) {
c.Response.Header().Set(HeaderContentType, MIMEHTML+"; charset=utf-8")
c.Response.WriteHeader(code)
_, err = c.Response.Write([]byte(html))
return
}
// func (c *Context) File(code int, file, name string) {
// }
// 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{}) {
c.store[key] = val
}
// Redirect redirects the request using http.Redirect with status code.
func (c *Context) Redirect(code int, url string) {
http.Redirect(c.Response, c.Request, url, code)
}
func (c *Context) reset(w http.ResponseWriter, r *http.Request, e *Echo) {
c.Response.reset(w)
c.Request = r
c.echo = e
}