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http-to-meta.go
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http-to-meta.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package servicecontext
import (
"context"
"net"
"net/http"
"strings"
"time"
"github.com/pydio/cells/v4/common"
"github.com/pydio/cells/v4/common/service/context/metadata"
)
const (
HttpMetaExtracted = "HttpMetaExtracted"
HttpMetaRemoteAddress = "RemoteAddress"
HttpMetaRequestMethod = "RequestMethod"
HttpMetaRequestURI = "RequestURI"
HttpMetaHost = "RequestHost"
HttpMetaHostname = "RequestHostname"
HttpMetaPort = "RequestPort"
HttpMetaProtocol = "HttpProtocol"
HttpMetaUserAgent = "UserAgent"
HttpMetaContentType = "ContentType"
HttpMetaCookiesString = "CookiesString"
ClientTime = "ClientTime"
ServerTime = "ServerTime"
CtxWorkspaceUuid = "CtxWorkspaceUuid"
)
// HttpRequestInfoToMetadata extracts as much HTTP metadata as possible and stores it in the context as metadata.
func HttpRequestInfoToMetadata(ctx context.Context, req *http.Request) context.Context {
meta := map[string]string{}
if existing, ok := metadata.FromContextRead(ctx); ok {
if _, already := existing[HttpMetaExtracted]; already {
return ctx
}
for k, v := range existing {
meta[k] = v
}
}
meta[HttpMetaExtracted] = HttpMetaExtracted
layout := "2006-01-02T15:04-0700"
t := time.Now()
meta[ServerTime] = t.Format(layout)
//TODO: Retrieve client time and locale and set it here.
//Unfortunately this is not sent by HTTP Requests.
//We currently use server time instead of client time.
meta[ClientTime] = t.Format(layout)
meta[HttpMetaHost] = req.Host
if h, p, e := net.SplitHostPort(req.Host); e == nil {
meta[HttpMetaHostname] = h
meta[HttpMetaPort] = p
}
// We might want to also support new standard "Forwarded" header.
if h, ok := req.Header["X-Forwarded-For"]; ok {
ips := strings.Split(strings.Join(h, ""), ",")
meta[HttpMetaRemoteAddress] = ips[0]
} else if req.RemoteAddr != "" {
meta[HttpMetaRemoteAddress] = req.RemoteAddr
}
if h, ok := req.Header["User-Agent"]; ok {
meta[HttpMetaUserAgent] = strings.Join(h, "")
}
if h, ok := req.Header["Content-Type"]; ok {
meta[HttpMetaContentType] = strings.Join(h, "")
}
if h, ok := req.Header["X-Pydio-Span-Id"]; ok {
meta[SpanMetadataId] = strings.Join(h, "")
}
for _, key := range common.XSpecialPydioHeaders {
if h, ok := req.Header[key]; ok && len(h) > 0 {
meta[key] = h[0]
}
}
if req.RequestURI != "" {
meta[HttpMetaRequestURI] = req.RequestURI
}
if req.Method != "" {
meta[HttpMetaRequestMethod] = req.Method
}
if req.Proto != "" {
meta[HttpMetaProtocol] = req.Proto
}
if len(req.Cookies()) > 0 {
var cString []string
for _, c := range req.Cookies() {
if c.String() != "" {
cString = append(cString, c.String())
}
}
meta[HttpMetaCookiesString] = strings.Join(cString, "//")
}
return metadata.NewContext(ctx, meta)
}
// HttpWrapperMeta extracts data from the request and puts it in a context Metadata field.
func HttpWrapperMeta(ctx context.Context, h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r = r.WithContext(HttpRequestInfoToMetadata(r.Context(), r))
h.ServeHTTP(w, r)
})
}
// HttpMetaFromGrpcContext extracts metadata from context that may have been
// passed along across services (meta name may be lowered cased)
func HttpMetaFromGrpcContext(ctx context.Context, name string) (string, bool) {
if md, ok := metadata.FromContextRead(ctx); ok {
if v, o := md[name]; o {
return v, true
} else if vs, os := md[strings.ToLower(name)]; os {
return vs, true
} else if vc, oc := md[strings.Title(strings.ToLower(name))]; oc {
return vc, true
}
}
return "", false
}