77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
package middlewares
|
|
|
|
import (
|
|
"net/http"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/containous/traefik/log"
|
|
"github.com/containous/traefik/types"
|
|
"github.com/vulcand/oxy/forward"
|
|
"github.com/vulcand/oxy/utils"
|
|
)
|
|
|
|
//ErrorPagesHandler is a middleware that provides the custom error pages
|
|
type ErrorPagesHandler struct {
|
|
HTTPCodeRanges [][2]int
|
|
BackendURL string
|
|
errorPageForwarder *forward.Forwarder
|
|
}
|
|
|
|
//NewErrorPagesHandler initializes the utils.ErrorHandler for the custom error pages
|
|
func NewErrorPagesHandler(errorPage *types.ErrorPage, backendURL string) (*ErrorPagesHandler, error) {
|
|
fwd, err := forward.New()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
//Break out the http status code ranges into a low int and high int
|
|
//for ease of use at runtime
|
|
var blocks [][2]int
|
|
for _, block := range errorPage.Status {
|
|
codes := strings.Split(block, "-")
|
|
//if only a single HTTP code was configured, assume the best and create the correct configuration on the user's behalf
|
|
if len(codes) == 1 {
|
|
codes = append(codes, codes[0])
|
|
}
|
|
lowCode, err := strconv.Atoi(codes[0])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
highCode, err := strconv.Atoi(codes[1])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
blocks = append(blocks, [2]int{lowCode, highCode})
|
|
}
|
|
return &ErrorPagesHandler{
|
|
HTTPCodeRanges: blocks,
|
|
BackendURL: backendURL + errorPage.Query,
|
|
errorPageForwarder: fwd},
|
|
nil
|
|
}
|
|
|
|
func (ep *ErrorPagesHandler) ServeHTTP(w http.ResponseWriter, req *http.Request, next http.HandlerFunc) {
|
|
recorder := newRetryResponseRecorder(w)
|
|
|
|
next.ServeHTTP(recorder, req)
|
|
|
|
w.WriteHeader(recorder.GetCode())
|
|
//check the recorder code against the configured http status code ranges
|
|
for _, block := range ep.HTTPCodeRanges {
|
|
if recorder.GetCode() >= block[0] && recorder.GetCode() <= block[1] {
|
|
log.Errorf("Caught HTTP Status Code %d, returning error page", recorder.GetCode())
|
|
finalURL := strings.Replace(ep.BackendURL, "{status}", strconv.Itoa(recorder.GetCode()), -1)
|
|
if newReq, err := http.NewRequest(http.MethodGet, finalURL, nil); err != nil {
|
|
w.Write([]byte(http.StatusText(recorder.GetCode())))
|
|
} else {
|
|
ep.errorPageForwarder.ServeHTTP(w, newReq)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
//did not catch a configured status code so proceed with the request
|
|
utils.CopyHeaders(w.Header(), recorder.Header())
|
|
w.Write(recorder.GetBody().Bytes())
|
|
}
|