Adding upstream version 1.34.4.

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

config/plugin_id.go

@@ -0,0 +1,79 @@
+package config
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"sort"
+
+	"github.com/influxdata/toml/ast"
+)
+
+type keyValuePair struct {
+	Key   string
+	Value string
+}
+
+func processTable(parent string, table *ast.Table) ([]keyValuePair, error) {
+	var prefix string
+	var options []keyValuePair
+
+	if parent != "" {
+		prefix = parent + "."
+	}
+
+	for k, value := range table.Fields {
+		switch v := value.(type) {
+		case *ast.KeyValue:
+			key := prefix + k
+			options = append(options, keyValuePair{
+				Key:   key,
+				Value: v.Value.Source(),
+			})
+		case *ast.Table:
+			key := prefix + k
+			children, err := processTable(key, v)
+			if err != nil {
+				return nil, fmt.Errorf("parsing table for %q failed: %w", key, err)
+			}
+			options = append(options, children...)
+		case []*ast.Table:
+			for i, t := range v {
+				key := fmt.Sprintf("%s#%d.%s", prefix, i, k)
+				children, err := processTable(key, t)
+				if err != nil {
+					return nil, fmt.Errorf("parsing table for %q #%d failed: %w", key, i, err)
+				}
+				options = append(options, children...)
+			}
+		default:
+			return nil, fmt.Errorf("unknown node type %T in key %q", value, prefix+k)
+		}
+	}
+	return options, nil
+}
+
+func generatePluginID(prefix string, table *ast.Table) (string, error) {
+	// We need to ensure that identically configured plugins _always_
+	// result in the same ID no matter which order the options are specified.
+	// This is even more relevant as Golang does _not_ give any guarantee
+	// on the ordering of maps.
+	// So we flatten out the configuration options (also for nested objects)
+	// and then sort the resulting array by the canonical key-name.
+	cfg, err := processTable("", table)
+	if err != nil {
+		return "", fmt.Errorf("processing AST failed: %w", err)
+	}
+	sort.SliceStable(cfg, func(i, j int) bool { return cfg[i].Key < cfg[j].Key })
+
+	// Hash the config options to get the ID. We also prefix the ID with
+	// the plugin name to prevent overlap with other plugin types.
+	hash := sha256.New()
+	hash.Write(append([]byte(prefix), 0))
+	for _, kv := range cfg {
+		hash.Write([]byte(kv.Key + ":" + kv.Value))
+		hash.Write([]byte{0})
+	}
+
+	return hex.EncodeToString(hash.Sum(nil)), nil
+}