Initial commit on gh-pages

details.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+
+	"github.com/goccy/go-json"
+	"github.com/lukaszraczylo/ask"
+	libpack_logger "github.com/lukaszraczylo/graphql-monitoring-proxy/logging"
+	libpack_monitoring "github.com/lukaszraczylo/graphql-monitoring-proxy/monitoring"
+)
+
+const defaultValue = "-"
+
+var emptyMetrics = map[string]string{}
+
+func extractClaimsFromJWTHeader(authorization string) (usr, role string) {
+	usr, role = defaultValue, defaultValue
+
+	tokenParts := strings.SplitN(authorization, ".", 3)
+	if len(tokenParts) != 3 {
+		handleError("Can't split the token", map[string]interface{}{"token": authorization})
+		return
+	}
+
+	claim, err := base64.RawURLEncoding.DecodeString(tokenParts[1])
+	if err != nil {
+		handleError("Can't decode the token", map[string]interface{}{"token": authorization})
+		return
+	}
+
+	var claimMap map[string]interface{}
+	if err = json.Unmarshal(claim, &claimMap); err != nil {
+		handleError("Can't unmarshal the claim", map[string]interface{}{"token": authorization})
+		return
+	}
+
+	usr = extractClaim(claimMap, cfg.Client.JWTUserClaimPath, "user id")
+	role = extractClaim(claimMap, cfg.Client.JWTRoleClaimPath, "role")
+
+	return
+}
+
+func extractClaim(claimMap map[string]interface{}, claimPath, name string) string {
+	if claimPath == "" {
+		return defaultValue
+	}
+
+	value, ok := ask.For(claimMap, claimPath).String(defaultValue)
+	if !ok {
+		handleError(fmt.Sprintf("Can't find the %s", name), map[string]interface{}{"claim_map": claimMap, "path": claimPath})
+		return defaultValue
+	}
+
+	return value
+}
+
+func handleError(msg string, details map[string]interface{}) {
+	cfg.Monitoring.Increment(libpack_monitoring.MetricsFailed, emptyMetrics)
+	cfg.Logger.Error(&libpack_logger.LogMessage{
+		Message: msg,
+		Pairs:   details,
+	})
+}