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package server
import (
"fmt"
"git.rodere.systems/stream-service/api"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"log"
"strings"
)
// private type for Context keys
type contextKey int
const (
clientIDKey contextKey = iota
)
func credMatcher(headerName string) (mdName string, ok bool) {
if headerName == "Login" || headerName == "Password" {
return headerName, true
}
return "", false
}
// authenticateAgent check the client credentials
func authenticateClient(ctx context.Context, s *api.Server) (string, error) {
if md, ok := metadata.FromIncomingContext(ctx); ok {
clientLogin := strings.Join(md["login"], "")
clientPassword := strings.Join(md["password"], "")
if clientLogin != "john" {
return "", fmt.Errorf("unknown user %s", clientLogin)
}
if clientPassword != "doe" {
return "", fmt.Errorf("bad password %s", clientPassword)
}
log.Printf("authenticated client: %s", clientLogin)
return "42", nil
}
return "", fmt.Errorf("missing credentials")
}
// unaryInterceptor call authenticateClient with current context
func unaryInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
s, ok := info.Server.(*api.Server)
if !ok {
return nil, fmt.Errorf("unable to cast server")
}
clientID, err := authenticateClient(ctx, s)
if err != nil {
return nil, err
}
ctx = context.WithValue(ctx, clientIDKey, clientID)
return handler(ctx, req)
}
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