Update godeps

vendor/github.com/prometheus/common/expfmt/decode.go

@@ -46,10 +46,7 @@ func ResponseFormat(h http.Header) Format {
 		return FmtUnknown
 	}
 
-	const (
-		textType = "text/plain"
-		jsonType = "application/json"
-	)
+	const textType = "text/plain"
 
 	switch mediatype {
 	case ProtoType:
@@ -66,22 +63,6 @@ func ResponseFormat(h http.Header) Format {
 			return FmtUnknown
 		}
 		return FmtText
-
-	case jsonType:
-		var prometheusAPIVersion string
-
-		if params["schema"] == "prometheus/telemetry" && params["version"] != "" {
-			prometheusAPIVersion = params["version"]
-		} else {
-			prometheusAPIVersion = h.Get("X-Prometheus-API-Version")
-		}
-
-		switch prometheusAPIVersion {
-		case "0.0.2", "":
-			return fmtJSON2
-		default:
-			return FmtUnknown
-		}
 	}
 
 	return FmtUnknown
@@ -93,8 +74,6 @@ func NewDecoder(r io.Reader, format Format) Decoder {
 	switch format {
 	case FmtProtoDelim:
 		return &protoDecoder{r: r}
-	case fmtJSON2:
-		return newJSON2Decoder(r)
 	}
 	return &textDecoder{r: r}
 }
@@ -107,10 +86,32 @@ type protoDecoder struct {
 // Decode implements the Decoder interface.
 func (d *protoDecoder) Decode(v *dto.MetricFamily) error {
 	_, err := pbutil.ReadDelimited(d.r, v)
-	return err
+	if err != nil {
+		return err
+	}
+	if !model.IsValidMetricName(model.LabelValue(v.GetName())) {
+		return fmt.Errorf("invalid metric name %q", v.GetName())
+	}
+	for _, m := range v.GetMetric() {
+		if m == nil {
+			continue
+		}
+		for _, l := range m.GetLabel() {
+			if l == nil {
+				continue
+			}
+			if !model.LabelValue(l.GetValue()).IsValid() {
+				return fmt.Errorf("invalid label value %q", l.GetValue())
+			}
+			if !model.LabelName(l.GetName()).IsValid() {
+				return fmt.Errorf("invalid label name %q", l.GetName())
+			}
+		}
+	}
+	return nil
 }
 
-// textDecoder implements the Decoder interface for the text protcol.
+// textDecoder implements the Decoder interface for the text protocol.
 type textDecoder struct {
 	r    io.Reader
 	p    TextParser