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193 lines (166 loc) · 5.35 KB
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package revel
import (
"bytes"
"fmt"
"net/http"
"sort"
"strconv"
"strings"
"code.google.com/p/go.net/websocket"
)
type Request struct {
*http.Request
ContentType string
Format string // "html", "xml", "json", or "txt"
AcceptLanguages AcceptLanguages
Locale string
Websocket *websocket.Conn
}
type Response struct {
Status int
ContentType string
Out http.ResponseWriter
}
func NewResponse(w http.ResponseWriter) *Response {
return &Response{Out: w}
}
func NewRequest(r *http.Request) *Request {
return &Request{
Request: r,
ContentType: ResolveContentType(r),
Format: ResolveFormat(r),
AcceptLanguages: ResolveAcceptLanguage(r),
}
}
// Write the header (for now, just the status code).
// The status may be set directly by the application (c.Response.Status = 501).
// if it isn't, then fall back to the provided status code.
func (resp *Response) WriteHeader(defaultStatusCode int, defaultContentType string) {
if resp.Status == 0 {
resp.Status = defaultStatusCode
}
if resp.ContentType == "" {
resp.ContentType = defaultContentType
}
resp.Out.Header().Set("Content-Type", resp.ContentType)
resp.Out.WriteHeader(resp.Status)
}
// Get the content type.
// e.g. From "multipart/form-data; boundary=--" to "multipart/form-data"
// If none is specified, returns "text/html" by default.
func ResolveContentType(req *http.Request) string {
contentType := req.Header.Get("Content-Type")
if contentType == "" {
return "text/html"
}
return strings.ToLower(strings.TrimSpace(strings.Split(contentType, ";")[0]))
}
// ResolveFormat maps the request's Accept MIME type declaration to
// a Request.Format attribute, specifically "html", "xml", "json", or "txt",
// returning a default of "html" when Accept header cannot be mapped to a
// value above.
func ResolveFormat(req *http.Request) string {
accept := req.Header.Get("accept")
switch {
case accept == "",
strings.HasPrefix(accept, "*/*"), // */
strings.Contains(accept, "application/xhtml"),
strings.Contains(accept, "text/html"):
return "html"
case strings.Contains(accept, "application/xml"),
strings.Contains(accept, "text/xml"):
return "xml"
case strings.Contains(accept, "text/plain"):
return "txt"
case strings.Contains(accept, "application/json"),
strings.Contains(accept, "text/javascript"):
return "json"
}
return "html"
}
// AcceptLanguage is a single language from the Accept-Language HTTP header.
type AcceptLanguage struct {
Language string
Quality float32
}
// AcceptLanguages is collection of sortable AcceptLanguage instances.
type AcceptLanguages []AcceptLanguage
func (al AcceptLanguages) Len() int { return len(al) }
func (al AcceptLanguages) Swap(i, j int) { al[i], al[j] = al[j], al[i] }
func (al AcceptLanguages) Less(i, j int) bool { return al[i].Quality > al[j].Quality }
func (al AcceptLanguages) String() string {
output := bytes.NewBufferString("")
for i, language := range al {
output.WriteString(fmt.Sprintf("%s (%1.1f)", language.Language, language.Quality))
if i != len(al)-1 {
output.WriteString(", ")
}
}
return output.String()
}
// ResolveAcceptLanguage returns a sorted list of Accept-Language
// header values.
//
// The results are sorted using the quality defined in the header for each
// language range with the most qualified language range as the first
// element in the slice.
//
// See the HTTP header fields specification
// (http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4) for more details.
func ResolveAcceptLanguage(req *http.Request) AcceptLanguages {
header := req.Header.Get("Accept-Language")
if header == "" {
return nil
}
acceptLanguageHeaderValues := strings.Split(header, ",")
acceptLanguages := make(AcceptLanguages, len(acceptLanguageHeaderValues))
for i, languageRange := range acceptLanguageHeaderValues {
if qualifiedRange := strings.Split(languageRange, ";q="); len(qualifiedRange) == 2 {
quality, error := strconv.ParseFloat(qualifiedRange[1], 32)
if error != nil {
WARN.Printf("Detected malformed Accept-Language header quality in '%s', assuming quality is 1", languageRange)
acceptLanguages[i] = AcceptLanguage{qualifiedRange[0], 1}
} else {
acceptLanguages[i] = AcceptLanguage{qualifiedRange[0], float32(quality)}
}
} else {
acceptLanguages[i] = AcceptLanguage{languageRange, 1}
}
}
sort.Sort(acceptLanguages)
return acceptLanguages
}
func CanHttpMethodOverride(method string) bool {
// allowed http verbs.
httpVerbs := map[string]bool{
"POST": true,
"HEAD": true,
"PUT": true,
"PATCH": true,
"DELETE": true,
"TRACE": true,
"OPTIONS": true,
"CONNECT": true,
}
return httpVerbs[strings.ToUpper(method)]
}
// Override allowed http methods via post form _method param
func HttpMethodOverrideFilter(c *Controller, fc []Filter) {
method := strings.ToUpper(c.Request.Request.Method)
if method == "POST" {
_method := strings.ToUpper(c.Request.Request.PostFormValue("_method"))
if _method != "" {
if CanHttpMethodOverride(_method) {
c.Request.Request.Method = _method
} else {
c.Response.Status = http.StatusMethodNotAllowed
c.Result = c.RenderError(&Error{
Title: http.StatusText(http.StatusMethodNotAllowed),
Description: "Request method " + _method + " is not supported.",
})
return
}
}
}
fc[0](c, fc[1:]) // Execute the next filter stage.
}