Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/zipkin/handler.go

@@ -0,0 +1,141 @@
+package zipkin
+
+import (
+	"compress/gzip"
+	"fmt"
+	"io"
+	"mime"
+	"net/http"
+	"strings"
+
+	"github.com/gorilla/mux"
+
+	"github.com/influxdata/telegraf/plugins/inputs/zipkin/codec"
+	json_v1 "github.com/influxdata/telegraf/plugins/inputs/zipkin/codec/jsonV1"
+	"github.com/influxdata/telegraf/plugins/inputs/zipkin/codec/thrift"
+)
+
+// spanHandler is an implementation of a handler which accepts zipkin thrift span data and sends it to the recorder
+type spanHandler struct {
+	path     string
+	recorder recorder
+}
+
+func newSpanHandler(path string) *spanHandler {
+	return &spanHandler{
+		path: path,
+	}
+}
+
+func cors(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if origin := r.Header.Get("Origin"); origin != "" {
+			w.Header().Set(`Access-Control-Allow-Origin`, origin)
+			w.Header().Set(`Access-Control-Allow-Methods`, strings.Join([]string{
+				`OPTIONS`,
+				`POST`,
+			}, ", "))
+
+			w.Header().Set(`Access-Control-Allow-Headers`, strings.Join([]string{
+				`Accept`,
+				`Accept-Encoding`,
+				`Content-Length`,
+				`Content-Type`,
+			}, ", "))
+
+			w.Header().Set(`Access-Control-Expose-Headers`, strings.Join([]string{
+				`Date`,
+			}, ", "))
+		}
+
+		if r.Method == "OPTIONS" {
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	}
+}
+
+// register implements the Service interface. Register accepts zipkin thrift data
+// POSTed to the path of the mux router
+func (s *spanHandler) register(router *mux.Router, recorder recorder) error {
+	handler := cors(http.HandlerFunc(s.spans))
+	router.Handle(s.path, handler).Methods("POST", "OPTIONS")
+	s.recorder = recorder
+	return nil
+}
+
+// spans handles zipkin thrift spans
+func (s *spanHandler) spans(w http.ResponseWriter, r *http.Request) {
+	defer r.Body.Close()
+	body := r.Body
+	var err error
+	// Handle gzip decoding of the body
+	if r.Header.Get("Content-Encoding") == "gzip" {
+		body, err = gzip.NewReader(r.Body)
+		if err != nil {
+			s.recorder.error(err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		defer body.Close()
+	}
+
+	decoder, err := contentDecoder(r)
+	if err != nil {
+		s.recorder.error(err)
+		w.WriteHeader(http.StatusUnsupportedMediaType)
+	}
+
+	octets, err := io.ReadAll(body)
+	if err != nil {
+		s.recorder.error(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	spans, err := decoder.Decode(octets)
+	if err != nil {
+		s.recorder.error(err)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	trace, err := codec.NewTrace(spans)
+	if err != nil {
+		s.recorder.error(err)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	if err = s.recorder.record(trace); err != nil {
+		s.recorder.error(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// contentDecoder returns a Decoder that is able to produce Traces from bytes.
+// Failure should yield an HTTP 415 (`http.StatusUnsupportedMediaType`)
+// If a Content-Type is not set, zipkin assumes application/json
+func contentDecoder(r *http.Request) (codec.Decoder, error) {
+	contentType := r.Header.Get("Content-Type")
+	if contentType == "" {
+		return &json_v1.JSON{}, nil
+	}
+
+	for _, v := range strings.Split(contentType, ",") {
+		t, _, err := mime.ParseMediaType(v)
+		if err != nil {
+			break
+		}
+		if t == "application/json" {
+			return &json_v1.JSON{}, nil
+		} else if t == "application/x-thrift" {
+			return &thrift.Thrift{}, nil
+		}
+	}
+	return nil, fmt.Errorf("unknown Content-Type: %s", contentType)
+}