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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"crypto"
"crypto/rand"
"encoding/base64"
"fmt"
"html/template"
"net/http"
"net/url"
"strings"
"github.com/mattermost/mattermost-server/model"
)
func CheckOrigin(r *http.Request, allowedOrigins string) bool {
origin := r.Header.Get("Origin")
if allowedOrigins == "*" {
return true
}
for _, allowed := range strings.Split(allowedOrigins, " ") {
if allowed == origin {
return true
}
}
return false
}
func OriginChecker(allowedOrigins string) func(*http.Request) bool {
return func(r *http.Request) bool {
return CheckOrigin(r, allowedOrigins)
}
}
func RenderWebAppError(w http.ResponseWriter, r *http.Request, err *model.AppError, s crypto.Signer) {
RenderWebError(w, r, err.StatusCode, url.Values{
"message": []string{err.Message},
}, s)
}
func RenderWebError(w http.ResponseWriter, r *http.Request, status int, params url.Values, s crypto.Signer) {
queryString := params.Encode()
h := crypto.SHA256
sum := h.New()
sum.Write([]byte("/error?" + queryString))
signature, err := s.Sign(rand.Reader, sum.Sum(nil), h)
if err != nil {
http.Error(w, "", http.StatusInternalServerError)
return
}
destination := "/error?" + queryString + "&s=" + base64.URLEncoding.EncodeToString(signature)
if status >= 300 && status < 400 {
http.Redirect(w, r, destination, status)
return
}
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(status)
fmt.Fprintln(w, `<!DOCTYPE html><html><head></head>`)
fmt.Fprintln(w, `<body onload="window.location = '`+template.HTMLEscapeString(template.JSEscapeString(destination))+`'">`)
fmt.Fprintln(w, `<noscript><meta http-equiv="refresh" content="0; url=`+template.HTMLEscapeString(destination)+`"></noscript>`)
fmt.Fprintln(w, `<a href="`+template.HTMLEscapeString(destination)+`" style="color: #c0c0c0;">...</a>`)
fmt.Fprintln(w, `</body></html>`)
}
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