1 files changed, 336 insertions, 0 deletions
diff --git a/vendor/go.opentelemetry.io/otel/semconv/internal/http.go b/vendor/go.opentelemetry.io/otel/semconv/internal/http.go
new file mode 100644
index 000000000..b580eedef
--- /dev/null
+++ b/vendor/go.opentelemetry.io/otel/semconv/internal/http.go
@@ -0,0 +1,336 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal // import "go.opentelemetry.io/otel/semconv/internal"
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
+)
+
+// SemanticConventions are the semantic convention values defined for a
+// version of the OpenTelemetry specification.
+type SemanticConventions struct {
+	EnduserIDKey                attribute.Key
+	HTTPClientIPKey             attribute.Key
+	HTTPFlavorKey               attribute.Key
+	HTTPHostKey                 attribute.Key
+	HTTPMethodKey               attribute.Key
+	HTTPRequestContentLengthKey attribute.Key
+	HTTPRouteKey                attribute.Key
+	HTTPSchemeHTTP              attribute.KeyValue
+	HTTPSchemeHTTPS             attribute.KeyValue
+	HTTPServerNameKey           attribute.Key
+	HTTPStatusCodeKey           attribute.Key
+	HTTPTargetKey               attribute.Key
+	HTTPURLKey                  attribute.Key
+	HTTPUserAgentKey            attribute.Key
+	NetHostIPKey                attribute.Key
+	NetHostNameKey              attribute.Key
+	NetHostPortKey              attribute.Key
+	NetPeerIPKey                attribute.Key
+	NetPeerNameKey              attribute.Key
+	NetPeerPortKey              attribute.Key
+	NetTransportIP              attribute.KeyValue
+	NetTransportOther           attribute.KeyValue
+	NetTransportTCP             attribute.KeyValue
+	NetTransportUDP             attribute.KeyValue
+	NetTransportUnix            attribute.KeyValue
+}
+
+// NetAttributesFromHTTPRequest generates attributes of the net
+// namespace as specified by the OpenTelemetry specification for a
+// span.  The network parameter is a string that net.Dial function
+// from standard library can understand.
+func (sc *SemanticConventions) NetAttributesFromHTTPRequest(network string, request *http.Request) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{}
+
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		attrs = append(attrs, sc.NetTransportTCP)
+	case "udp", "udp4", "udp6":
+		attrs = append(attrs, sc.NetTransportUDP)
+	case "ip", "ip4", "ip6":
+		attrs = append(attrs, sc.NetTransportIP)
+	case "unix", "unixgram", "unixpacket":
+		attrs = append(attrs, sc.NetTransportUnix)
+	default:
+		attrs = append(attrs, sc.NetTransportOther)
+	}
+
+	peerIP, peerName, peerPort := hostIPNamePort(request.RemoteAddr)
+	if peerIP != "" {
+		attrs = append(attrs, sc.NetPeerIPKey.String(peerIP))
+	}
+	if peerName != "" {
+		attrs = append(attrs, sc.NetPeerNameKey.String(peerName))
+	}
+	if peerPort != 0 {
+		attrs = append(attrs, sc.NetPeerPortKey.Int(peerPort))
+	}
+
+	hostIP, hostName, hostPort := "", "", 0
+	for _, someHost := range []string{request.Host, request.Header.Get("Host"), request.URL.Host} {
+		hostIP, hostName, hostPort = hostIPNamePort(someHost)
+		if hostIP != "" || hostName != "" || hostPort != 0 {
+			break
+		}
+	}
+	if hostIP != "" {
+		attrs = append(attrs, sc.NetHostIPKey.String(hostIP))
+	}
+	if hostName != "" {
+		attrs = append(attrs, sc.NetHostNameKey.String(hostName))
+	}
+	if hostPort != 0 {
+		attrs = append(attrs, sc.NetHostPortKey.Int(hostPort))
+	}
+
+	return attrs
+}
+
+// hostIPNamePort extracts the IP address, name and (optional) port from hostWithPort.
+// It handles both IPv4 and IPv6 addresses. If the host portion is not recognized
+// as a valid IPv4 or IPv6 address, the `ip` result will be empty and the
+// host portion will instead be returned in `name`.
+func hostIPNamePort(hostWithPort string) (ip string, name string, port int) {
+	var (
+		hostPart, portPart string
+		parsedPort         uint64
+		err                error
+	)
+	if hostPart, portPart, err = net.SplitHostPort(hostWithPort); err != nil {
+		hostPart, portPart = hostWithPort, ""
+	}
+	if parsedIP := net.ParseIP(hostPart); parsedIP != nil {
+		ip = parsedIP.String()
+	} else {
+		name = hostPart
+	}
+	if parsedPort, err = strconv.ParseUint(portPart, 10, 16); err == nil {
+		port = int(parsedPort)
+	}
+	return
+}
+
+// EndUserAttributesFromHTTPRequest generates attributes of the
+// enduser namespace as specified by the OpenTelemetry specification
+// for a span.
+func (sc *SemanticConventions) EndUserAttributesFromHTTPRequest(request *http.Request) []attribute.KeyValue {
+	if username, _, ok := request.BasicAuth(); ok {
+		return []attribute.KeyValue{sc.EnduserIDKey.String(username)}
+	}
+	return nil
+}
+
+// HTTPClientAttributesFromHTTPRequest generates attributes of the
+// http namespace as specified by the OpenTelemetry specification for
+// a span on the client side.
+func (sc *SemanticConventions) HTTPClientAttributesFromHTTPRequest(request *http.Request) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{}
+
+	// remove any username/password info that may be in the URL
+	// before adding it to the attributes
+	userinfo := request.URL.User
+	request.URL.User = nil
+
+	attrs = append(attrs, sc.HTTPURLKey.String(request.URL.String()))
+
+	// restore any username/password info that was removed
+	request.URL.User = userinfo
+
+	return append(attrs, sc.httpCommonAttributesFromHTTPRequest(request)...)
+}
+
+func (sc *SemanticConventions) httpCommonAttributesFromHTTPRequest(request *http.Request) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{}
+	if ua := request.UserAgent(); ua != "" {
+		attrs = append(attrs, sc.HTTPUserAgentKey.String(ua))
+	}
+	if request.ContentLength > 0 {
+		attrs = append(attrs, sc.HTTPRequestContentLengthKey.Int64(request.ContentLength))
+	}
+
+	return append(attrs, sc.httpBasicAttributesFromHTTPRequest(request)...)
+}
+
+func (sc *SemanticConventions) httpBasicAttributesFromHTTPRequest(request *http.Request) []attribute.KeyValue {
+	// as these attributes are used by HTTPServerMetricAttributesFromHTTPRequest, they should be low-cardinality
+	attrs := []attribute.KeyValue{}
+
+	if request.TLS != nil {
+		attrs = append(attrs, sc.HTTPSchemeHTTPS)
+	} else {
+		attrs = append(attrs, sc.HTTPSchemeHTTP)
+	}
+
+	if request.Host != "" {
+		attrs = append(attrs, sc.HTTPHostKey.String(request.Host))
+	} else if request.URL != nil && request.URL.Host != "" {
+		attrs = append(attrs, sc.HTTPHostKey.String(request.URL.Host))
+	}
+
+	flavor := ""
+	if request.ProtoMajor == 1 {
+		flavor = fmt.Sprintf("1.%d", request.ProtoMinor)
+	} else if request.ProtoMajor == 2 {
+		flavor = "2"
+	}
+	if flavor != "" {
+		attrs = append(attrs, sc.HTTPFlavorKey.String(flavor))
+	}
+
+	if request.Method != "" {
+		attrs = append(attrs, sc.HTTPMethodKey.String(request.Method))
+	} else {
+		attrs = append(attrs, sc.HTTPMethodKey.String(http.MethodGet))
+	}
+
+	return attrs
+}
+
+// HTTPServerMetricAttributesFromHTTPRequest generates low-cardinality attributes
+// to be used with server-side HTTP metrics.
+func (sc *SemanticConventions) HTTPServerMetricAttributesFromHTTPRequest(serverName string, request *http.Request) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{}
+	if serverName != "" {
+		attrs = append(attrs, sc.HTTPServerNameKey.String(serverName))
+	}
+	return append(attrs, sc.httpBasicAttributesFromHTTPRequest(request)...)
+}
+
+// HTTPServerAttributesFromHTTPRequest generates attributes of the
+// http namespace as specified by the OpenTelemetry specification for
+// a span on the server side. Currently, only basic authentication is
+// supported.
+func (sc *SemanticConventions) HTTPServerAttributesFromHTTPRequest(serverName, route string, request *http.Request) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{
+		sc.HTTPTargetKey.String(request.RequestURI),
+	}
+
+	if serverName != "" {
+		attrs = append(attrs, sc.HTTPServerNameKey.String(serverName))
+	}
+	if route != "" {
+		attrs = append(attrs, sc.HTTPRouteKey.String(route))
+	}
+	if values, ok := request.Header["X-Forwarded-For"]; ok && len(values) > 0 {
+		if addresses := strings.SplitN(values[0], ",", 2); len(addresses) > 0 {
+			attrs = append(attrs, sc.HTTPClientIPKey.String(addresses[0]))
+		}
+	}
+
+	return append(attrs, sc.httpCommonAttributesFromHTTPRequest(request)...)
+}
+
+// HTTPAttributesFromHTTPStatusCode generates attributes of the http
+// namespace as specified by the OpenTelemetry specification for a
+// span.
+func (sc *SemanticConventions) HTTPAttributesFromHTTPStatusCode(code int) []attribute.KeyValue {
+	attrs := []attribute.KeyValue{
+		sc.HTTPStatusCodeKey.Int(code),
+	}
+	return attrs
+}
+
+type codeRange struct {
+	fromInclusive int
+	toInclusive   int
+}
+
+func (r codeRange) contains(code int) bool {
+	return r.fromInclusive <= code && code <= r.toInclusive
+}
+
+var validRangesPerCategory = map[int][]codeRange{
+	1: {
+		{http.StatusContinue, http.StatusEarlyHints},
+	},
+	2: {
+		{http.StatusOK, http.StatusAlreadyReported},
+		{http.StatusIMUsed, http.StatusIMUsed},
+	},
+	3: {
+		{http.StatusMultipleChoices, http.StatusUseProxy},
+		{http.StatusTemporaryRedirect, http.StatusPermanentRedirect},
+	},
+	4: {
+		{http.StatusBadRequest, http.StatusTeapot}, // yes, teapot is so useful…
+		{http.StatusMisdirectedRequest, http.StatusUpgradeRequired},
+		{http.StatusPreconditionRequired, http.StatusTooManyRequests},
+		{http.StatusRequestHeaderFieldsTooLarge, http.StatusRequestHeaderFieldsTooLarge},
+		{http.StatusUnavailableForLegalReasons, http.StatusUnavailableForLegalReasons},
+	},
+	5: {
+		{http.StatusInternalServerError, http.StatusLoopDetected},
+		{http.StatusNotExtended, http.StatusNetworkAuthenticationRequired},
+	},
+}
+
+// SpanStatusFromHTTPStatusCode generates a status code and a message
+// as specified by the OpenTelemetry specification for a span.
+func SpanStatusFromHTTPStatusCode(code int) (codes.Code, string) {
+	spanCode, valid := validateHTTPStatusCode(code)
+	if !valid {
+		return spanCode, fmt.Sprintf("Invalid HTTP status code %d", code)
+	}
+	return spanCode, ""
+}
+
+// SpanStatusFromHTTPStatusCodeAndSpanKind generates a status code and a message
+// as specified by the OpenTelemetry specification for a span.
+// Exclude 4xx for SERVER to set the appropriate status.
+func SpanStatusFromHTTPStatusCodeAndSpanKind(code int, spanKind trace.SpanKind) (codes.Code, string) {
+	spanCode, valid := validateHTTPStatusCode(code)
+	if !valid {
+		return spanCode, fmt.Sprintf("Invalid HTTP status code %d", code)
+	}
+	category := code / 100
+	if spanKind == trace.SpanKindServer && category == 4 {
+		return codes.Unset, ""
+	}
+	return spanCode, ""
+}
+
+// validateHTTPStatusCode validates the HTTP status code and returns
+// corresponding span status code. If the `code` is not a valid HTTP status
+// code, returns span status Error and false.
+func validateHTTPStatusCode(code int) (codes.Code, bool) {
+	category := code / 100
+	ranges, ok := validRangesPerCategory[category]
+	if !ok {
+		return codes.Error, false
+	}
+	ok = false
+	for _, crange := range ranges {
+		ok = crange.contains(code)
+		if ok {
+			break
+		}
+	}
+	if !ok {
+		return codes.Error, false
+	}
+	if category > 0 && category < 4 {
+		return codes.Unset, true
+	}
+	return codes.Error, true
+}