forked from open-telemetry/opentelemetry-collector-contrib
/
clientinfohandler.go
68 lines (55 loc) · 1.86 KB
/
clientinfohandler.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package confighttp // import "github.com/amazon-contributing/opentelemetry-collector-contrib/config/confighttp"
import (
"context"
"net"
"net/http"
"go.opentelemetry.io/collector/client"
)
var _ http.Handler = (*clientInfoHandler)(nil)
// clientInfoHandler is an http.Handler that enhances the incoming request context with client.Info.
type clientInfoHandler struct {
next http.Handler
// include client metadata or not
includeMetadata bool
}
// ServeHTTP intercepts incoming HTTP requests, replacing the request's context with one that contains
// a client.Info containing the client's IP address.
func (h *clientInfoHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
req = req.WithContext(contextWithClient(req, h.includeMetadata))
h.next.ServeHTTP(w, req)
}
// contextWithClient attempts to add the client IP address to the client.Info from the context. When no
// client.Info exists in the context, one is created.
func contextWithClient(req *http.Request, includeMetadata bool) context.Context {
cl := client.FromContext(req.Context())
ip := parseIP(req.RemoteAddr)
if ip != nil {
cl.Addr = ip
}
if includeMetadata {
md := req.Header.Clone()
if len(md.Get(client.MetadataHostName)) == 0 && req.Host != "" {
md.Add(client.MetadataHostName, req.Host)
}
cl.Metadata = client.NewMetadata(md)
}
ctx := client.NewContext(req.Context(), cl)
return ctx
}
// parseIP parses the given string for an IP address. The input string might contain the port,
// but must not contain a protocol or path. Suitable for getting the IP part of a client connection.
func parseIP(source string) *net.IPAddr {
ipstr, _, err := net.SplitHostPort(source)
if err == nil {
source = ipstr
}
ip := net.ParseIP(source)
if ip != nil {
return &net.IPAddr{
IP: ip,
}
}
return nil
}