79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
package configutil
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import (
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"encoding/json"
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"strings"
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"google.golang.org/protobuf/encoding/protojson"
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"google.golang.org/protobuf/proto"
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)
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// MergeProtoJSON applies a JSON object as a partial protobuf update while
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// retaining fields omitted by the caller.
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func MergeProtoJSON(target proto.Message, patch json.RawMessage, options protojson.UnmarshalOptions) error {
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currentRaw, err := protojson.MarshalOptions{UseProtoNames: false}.Marshal(target)
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if err != nil {
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return err
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}
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var current map[string]any
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if err = json.Unmarshal(currentRaw, ¤t); err != nil {
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return err
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}
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var incoming map[string]any
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if err = json.Unmarshal(patch, &incoming); err != nil {
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return err
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}
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incoming = normalizeJSONKeys(incoming).(map[string]any)
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mergeJSONObjects(current, incoming)
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merged, err := json.Marshal(current)
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if err != nil {
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return err
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}
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return options.Unmarshal(merged, target)
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}
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func normalizeJSONKeys(value any) any {
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switch item := value.(type) {
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case map[string]any:
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result := make(map[string]any, len(item))
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for key, nested := range item {
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result[snakeToLowerCamel(key)] = normalizeJSONKeys(nested)
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}
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return result
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case []any:
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result := make([]any, len(item))
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for index, nested := range item {
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result[index] = normalizeJSONKeys(nested)
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}
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return result
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default:
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return value
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}
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}
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func snakeToLowerCamel(value string) string {
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if !strings.Contains(value, "_") {
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return value
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}
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parts := strings.Split(value, "_")
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result := parts[0]
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for _, part := range parts[1:] {
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if part != "" {
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result += strings.ToUpper(part[:1]) + part[1:]
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}
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}
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return result
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}
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func mergeJSONObjects(target, patch map[string]any) {
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for key, value := range patch {
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if incoming, ok := value.(map[string]any); ok {
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if existing, exists := target[key].(map[string]any); exists {
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mergeJSONObjects(existing, incoming)
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continue
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}
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}
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target[key] = value
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}
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}
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