Allow filtering emails via headers

internal/query/get_inbox.go

@@ -19,6 +19,7 @@ type InboxSearch struct {
 	From    string
 	Body    string
 	Subject string
+	Headers map[string]string
 	After   time.Time
 	Before  time.Time
 }
@@ -149,6 +150,38 @@ func HandleGetInbox(ctx context.Context, qry cqrs.Query) (interface{}, error) {
 			match = false
 		}
 
+		if req.Search.Headers != nil {
+			found := false
+
+			for searchKey, searchValue := range req.Search.Headers {
+				for headerKey, headerValues := range eml.Headers {
+					if searchKey != headerKey {
+						continue
+					}
+
+					for _, hv := range headerValues {
+						if strings.Contains(hv, searchValue) {
+							found = true
+
+							break
+						}
+					}
+
+					if found {
+						break
+					}
+				}
+
+				if found {
+					break
+				}
+			}
+
+			if !found {
+				match = false
+			}
+		}
+
 		if match {
 			filtered = append(filtered, eml)
 		}