Add support dump API endpoint

pkg/api/handler_support_dump.go

@@ -0,0 +1,96 @@
+package api
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/traefik/v3/pkg/redactor"
+	"github.com/traefik/traefik/v3/pkg/version"
+)
+
+func (h Handler) getSupportDump(rw http.ResponseWriter, req *http.Request) {
+	logger := log.Ctx(req.Context())
+
+	staticConfig, err := redactor.Anonymize(h.staticConfig)
+	if err != nil {
+		logger.Error().Err(err).Msg("Unable to anonymize and marshal static configuration")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	runtimeConfig, err := json.Marshal(h.runtimeConfiguration)
+	if err != nil {
+		logger.Error().Err(err).Msg("Unable to marshal runtime configuration")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	tVersion, err := json.Marshal(struct {
+		Version   string    `json:"version"`
+		Codename  string    `json:"codename"`
+		StartDate time.Time `json:"startDate"`
+	}{
+		Version:   version.Version,
+		Codename:  version.Codename,
+		StartDate: version.StartDate,
+	})
+	if err != nil {
+		logger.Error().Err(err).Msg("Unable to marshal version")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	rw.Header().Set("Content-Type", "application/gzip")
+	rw.Header().Set("Content-Disposition", "attachment; filename=support-dump.tar.gz")
+
+	// Create gzip writer.
+	gw := gzip.NewWriter(rw)
+	defer gw.Close()
+
+	// Create tar writer.
+	tw := tar.NewWriter(gw)
+	defer tw.Close()
+
+	// Add configuration files to the archive.
+	if err := addFile(tw, "version.json", tVersion); err != nil {
+		logger.Error().Err(err).Msg("Unable to archive version file")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if err := addFile(tw, "static-config.json", []byte(staticConfig)); err != nil {
+		logger.Error().Err(err).Msg("Unable to archive static configuration")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if err := addFile(tw, "runtime-config.json", runtimeConfig); err != nil {
+		logger.Error().Err(err).Msg("Unable to archive runtime configuration")
+		writeError(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func addFile(tw *tar.Writer, name string, content []byte) error {
+	header := &tar.Header{
+		Name:    name,
+		Mode:    0o600,
+		Size:    int64(len(content)),
+		ModTime: time.Now(),
+	}
+
+	if err := tw.WriteHeader(header); err != nil {
+		return fmt.Errorf("writing tar header: %w", err)
+	}
+
+	if _, err := tw.Write(content); err != nil {
+		return fmt.Errorf("writing tar content: %w", err)
+	}
+
+	return nil
+}