frostfs-s3-gw/api/middleware/address_style.go
Roman Loginov bf00fa6aa9 [#449] Add support headers for vhs and servername
Signed-off-by: Roman Loginov <r.loginov@yadro.com>
2024-08-23 08:35:05 +00:00

148 lines
3.7 KiB
Go

package middleware
import (
"net/http"
"net/url"
"strconv"
"strings"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
"go.uber.org/zap"
)
const wildcardPlaceholder = "<wildcard>"
type VHSSettings interface {
Domains() []string
GlobalVHS() bool
VHSHeader() string
ServernameHeader() string
VHSNamespacesEnabled() map[string]bool
}
func PrepareAddressStyle(settings VHSSettings, log *zap.Logger) Func {
return func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
reqInfo := GetReqInfo(ctx)
reqLogger := reqLogOrDefault(ctx, log)
headerVHSEnabled := r.Header.Get(settings.VHSHeader())
if isVHSAddress(headerVHSEnabled, settings.GlobalVHS(), settings.VHSNamespacesEnabled(), reqInfo.Namespace) {
prepareVHSAddress(reqInfo, r, settings)
} else {
preparePathStyleAddress(reqInfo, r, reqLogger)
}
h.ServeHTTP(w, r)
})
}
}
func isVHSAddress(headerVHSEnabled string, enabledFlag bool, vhsNamespaces map[string]bool, namespace string) bool {
if result, err := strconv.ParseBool(headerVHSEnabled); err == nil {
return result
}
result := enabledFlag
if v, ok := vhsNamespaces[namespace]; ok {
result = v
}
return result
}
func prepareVHSAddress(reqInfo *ReqInfo, r *http.Request, settings VHSSettings) {
reqInfo.RequestVHSEnabled = true
bktName, match := checkDomain(r.Host, getDomains(r, settings))
if match {
if bktName == "" {
reqInfo.RequestType = noneType
} else {
if objName := strings.TrimPrefix(r.URL.Path, "/"); objName != "" {
reqInfo.RequestType = objectType
reqInfo.ObjectName = objName
reqInfo.BucketName = bktName
} else {
reqInfo.RequestType = bucketType
reqInfo.BucketName = bktName
}
}
} else {
parts := strings.Split(r.Host, ".")
reqInfo.BucketName = parts[0]
if objName := strings.TrimPrefix(r.URL.Path, "/"); objName != "" {
reqInfo.RequestType = objectType
reqInfo.ObjectName = objName
} else {
reqInfo.RequestType = bucketType
}
}
}
func getDomains(r *http.Request, settings VHSSettings) []string {
if headerServername := r.Header.Get(settings.ServernameHeader()); headerServername != "" {
return []string{headerServername}
}
return settings.Domains()
}
func preparePathStyleAddress(reqInfo *ReqInfo, r *http.Request, reqLogger *zap.Logger) {
bktObj := strings.TrimPrefix(r.URL.Path, "/")
if bktObj == "" {
reqInfo.RequestType = noneType
} else if ind := strings.IndexByte(bktObj, '/'); ind != -1 && bktObj[ind+1:] != "" {
reqInfo.RequestType = objectType
reqInfo.BucketName = bktObj[:ind]
reqInfo.ObjectName = bktObj[ind+1:]
if r.URL.RawPath != "" {
// we have to do this because of
// https://github.com/go-chi/chi/issues/641
// https://github.com/go-chi/chi/issues/642
if obj, err := url.PathUnescape(reqInfo.ObjectName); err != nil {
reqLogger.Warn(logs.FailedToUnescapeObjectName, zap.Error(err))
} else {
reqInfo.ObjectName = obj
}
}
} else {
reqInfo.RequestType = bucketType
reqInfo.BucketName = strings.TrimSuffix(bktObj, "/")
}
}
func checkDomain(host string, domains []string) (bktName string, match bool) {
partsHost := strings.Split(host, ".")
for _, pattern := range domains {
partsPattern := strings.Split(pattern, ".")
bktName, match = compareMatch(partsHost, partsPattern)
if match {
break
}
}
return
}
func compareMatch(host, pattern []string) (bktName string, match bool) {
if len(host) < len(pattern) {
return "", false
}
i, j := len(host)-1, len(pattern)-1
for j >= 0 && (pattern[j] == wildcardPlaceholder || host[i] == pattern[j]) {
i--
j--
}
switch {
case i == -1:
return "", true
case i == 0 && (j != 0 || host[i] == pattern[j]):
return host[0], true
default:
return "", false
}
}