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Adds RFC7239 checks to the new location middleware.

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The RFC7239 is the standard way to define headers about reverse proxy
redirections. It replaces all the X-Forwarded-* previous way of defining them.
We let the previous implementations exist to avoid breaking existant installations.
This commit is contained in:
Tanguy Herrmann 2015-12-03 18:36:55 +01:00
parent 69f5d90fd3
commit 4fde58d57e
1 changed files with 27 additions and 0 deletions
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27
router/middleware/location/location.go
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@ -15,6 +15,27 @@ func Resolve(c *gin.Context) {
c.Next()
}
// parseHeader parses non unique headers value
// from a http.Request and return a slice of the values
// queried from the header
func parseHeader(r *http.Request, header string, token string) (val []string) {
for _, v := range r.Header[header] {
options := strings.Split(v, ";")
for _, o := range options {
keyvalue := strings.Split(o, "=")
var key, value string
if len(keyvalue) > 1 {
key, value = strings.TrimSpace(keyvalue[0]), strings.TrimSpace(keyvalue[1])
}
key = strings.ToLower(key)
if key == token {
val = append(val, value)
}
}
}
return
}
// resolveScheme is a helper function that evaluates the http.Request
// and returns the scheme, HTTP or HTTPS. It is able to detect,
// using the X-Forwarded-Proto, if the original request was HTTPS
@ -29,6 +50,8 @@ func resolveScheme(r *http.Request) string {
return "https"
case r.Header.Get("X-Forwarded-Proto") == "https":
return "https"
case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "proto")) != 0 && parseHeader(r, "Forwarded", "proto")[0] == "https":
return "https"
default:
return "http"
}
@ -46,8 +69,12 @@ func resolveHost(r *http.Request) string {
return r.URL.Host
case len(r.Header.Get("X-Forwarded-For")) != 0:
return r.Header.Get("X-Forwarded-For")
case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "for")) != 0:
return parseHeader(r, "Forwarded", "for")[0]
case len(r.Header.Get("X-Host")) != 0:
return r.Header.Get("X-Host")
case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "host")) != 0:
return parseHeader(r, "Forwarded", "host")[0]
case len(r.Header.Get("XFF")) != 0:
return r.Header.Get("XFF")
case len(r.Header.Get("X-Real-IP")) != 0: