refactor(handler): extract DoReadOne from ReadOneWeb

pkg/web/handler/core.go

@@ -66,3 +66,43 @@ func DoCreate(_ context.Context, obj CObject, a web.Auth) error {
 	events.DispatchPending(s)
 	return nil
 }
+
+// DoReadOne runs the permission check + model ReadOne + commit pipeline for a
+// CObject. obj should have its identifying fields set before call. On success,
+// obj is fully populated. maxPermission is exposed via the x-max-permission
+// header in the Echo wrapper; Huma wrapper may ignore it.
+func DoReadOne(_ context.Context, obj CObject, a web.Auth) (maxPermission int, err error) {
+	s := db.NewSession()
+	defer func() {
+		if cerr := s.Close(); cerr != nil {
+			log.Errorf("Could not close session: %s", cerr)
+		}
+	}()
+
+	canRead, maxPermission, err := obj.CanRead(s, a)
+	if err != nil {
+		_ = s.Rollback()
+		events.CleanupPending(s)
+		return 0, err
+	}
+	if !canRead {
+		_ = s.Rollback()
+		events.CleanupPending(s)
+		log.Warningf("Tried to read while not having the permissions for it (User: %v)", a)
+		return 0, echo.NewHTTPError(http.StatusForbidden, "You don't have the permission to see this")
+	}
+
+	if err := obj.ReadOne(s, a); err != nil {
+		_ = s.Rollback()
+		events.CleanupPending(s)
+		return 0, err
+	}
+
+	if err := s.Commit(); err != nil {
+		events.CleanupPending(s)
+		return 0, err
+	}
+
+	events.DispatchPending(s)
+	return maxPermission, nil
+}

pkg/web/handler/read_one.go

@@ -22,8 +22,6 @@ import (
 	"net/http"
 	"strconv"
 
-	"code.vikunja.io/api/pkg/db"
-	"code.vikunja.io/api/pkg/events"
 	"code.vikunja.io/api/pkg/log"
 	"code.vikunja.io/api/pkg/models"
 	"code.vikunja.io/api/pkg/modules/auth"
@@ -52,49 +50,14 @@ func (c *WebHandler) ReadOneWeb(ctx *echo.Context) error {
 		return echo.NewHTTPError(http.StatusInternalServerError, "Could not determine the current user.").Wrap(err)
 	}
 
-	// Create the db session
-	s := db.NewSession()
-	defer func() {
-		err = s.Close()
-		if err != nil {
-			log.Errorf("Could not close session: %s", err)
-		}
-	}()
-
-	canRead, maxPermission, err := currentStruct.CanRead(s, currentAuth)
+	maxPermission, err := DoReadOne(ctx.Request().Context(), currentStruct, currentAuth)
 	if err != nil {
-		_ = s.Rollback()
-		events.CleanupPending(s)
-		return err
-	}
-	if !canRead {
-		_ = s.Rollback()
-		events.CleanupPending(s)
-		log.Warningf("Tried to read while not having the permissions for it (User: %v)", currentAuth)
-		return echo.NewHTTPError(http.StatusForbidden, "You don't have the permission to see this")
-	}
-
-	// Get our object
-	err = currentStruct.ReadOne(s, currentAuth)
-	if err != nil {
-		_ = s.Rollback()
-		events.CleanupPending(s)
 		return err
 	}
 
 	// Set the headers
-	if canRead {
-		ctx.Response().Header().Set("x-max-permission", strconv.FormatInt(int64(maxPermission), 10))
-		ctx.Response().Header().Set("Access-Control-Expose-Headers", "x-max-permission")
-	}
-
-	err = s.Commit()
-	if err != nil {
-		events.CleanupPending(s)
-		return err
-	}
-
-	events.DispatchPending(s)
+	ctx.Response().Header().Set("x-max-permission", strconv.FormatInt(int64(maxPermission), 10))
+	ctx.Response().Header().Set("Access-Control-Expose-Headers", "x-max-permission")
 
 	return ctx.JSON(http.StatusOK, currentStruct)
 }