first commit

protocols/hypertextTransferProtocolStrategy.go

@@ -0,0 +1,90 @@
+package protocols
+
+import (
+	"beelzebub/parser"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"io"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+type HypertextTransferProtocolStrategy struct {
+	serverMux                     *http.ServeMux
+	beelzebubServiceConfiguration parser.BeelzebubServiceConfiguration
+}
+
+func (httpStrategy HypertextTransferProtocolStrategy) Init(beelzebubServiceConfiguration parser.BeelzebubServiceConfiguration) error {
+	httpStrategy.beelzebubServiceConfiguration = beelzebubServiceConfiguration
+	httpStrategy.serverMux = http.NewServeMux()
+
+	httpStrategy.buildHandler()
+
+	go func() {
+		httpStrategy.listenAndServe()
+	}()
+
+	log.WithFields(log.Fields{
+		"port":     beelzebubServiceConfiguration.Address,
+		"commands": len(beelzebubServiceConfiguration.Commands),
+	}).Infof("Init service %s", beelzebubServiceConfiguration.Protocol)
+	return nil
+}
+
+func (httpStrategy HypertextTransferProtocolStrategy) listenAndServe() {
+	err := http.ListenAndServe(httpStrategy.beelzebubServiceConfiguration.Address, httpStrategy.serverMux)
+	if err != nil {
+		log.Errorf("Error during init HTTP Protocol: %s", err.Error())
+		return
+	}
+}
+
+func (httpStrategy HypertextTransferProtocolStrategy) buildHandler() {
+	httpStrategy.serverMux.HandleFunc("/", func(responseWriter http.ResponseWriter, request *http.Request) {
+		traceRequest(request)
+		for _, command := range httpStrategy.beelzebubServiceConfiguration.Commands {
+			matched, err := regexp.MatchString(command.Regex, request.RequestURI)
+			if err != nil {
+				log.Errorf("Error regex: %s, %s", command.Regex, err.Error())
+				continue
+			}
+
+			if matched {
+				setResponseHeaders(responseWriter, command.Headers, command.StatusCode)
+				fmt.Fprintf(responseWriter, command.Handler)
+				break
+			}
+		}
+	})
+}
+
+func traceRequest(request *http.Request) {
+	bodyBytes, err := io.ReadAll(request.Body)
+	body := ""
+	if err == nil {
+		body = string(bodyBytes)
+	}
+	log.WithFields(log.Fields{
+		"requestURI": request.RequestURI,
+		"proto":      request.Proto,
+		"method":     request.Method,
+		"body":       body,
+		"host":       request.Host,
+		"userAgent":  request.UserAgent(),
+		"cookies":    request.Cookies(),
+		"ip":         request.RemoteAddr,
+		"headers":    request.Header,
+		"remoteAddr": request.RemoteAddr,
+	}).Info("New HTTP request")
+}
+
+func setResponseHeaders(responseWriter http.ResponseWriter, headers []string, statusCode int) {
+	responseWriter.WriteHeader(statusCode)
+	for _, headerStr := range headers {
+		keyValue := strings.Split(headerStr, ":")
+		if len(keyValue) > 1 {
+			responseWriter.Header().Add(keyValue[0], keyValue[1])
+		}
+	}
+}