Allow filtering emails via headers

internal/route/helper.go

@@ -1,6 +1,7 @@
 package route
 
 import (
+	"encoding/json"
 	"net/http"
 	"strconv"
 	"time"
@@ -75,6 +76,16 @@ func createInboxQueryFromRequest(r *http.Request) (*query.GetInboxRequest, error
 		}
 	}
 
+	var headers map[string]string
+
+	rawHeaders := r.URL.Query().Get("headers")
+	if rawHeaders != "" {
+		headers = make(map[string]string)
+		if err := json.Unmarshal([]byte(rawHeaders), &headers); err != nil {
+			return nil, errors.WithStack(err)
+		}
+	}
+
 	search := &query.InboxSearch{}
 	if to != "" {
 		search.To = to
@@ -96,6 +107,10 @@ func createInboxQueryFromRequest(r *http.Request) (*query.GetInboxRequest, error
 		search.Before = before
 	}
 
+	if rawHeaders != "" {
+		search.Headers = headers
+	}
+
 	inboxRequest := &query.GetInboxRequest{
 		OrderBy: orderBy,
 		Reverse: reverse == "y",