feat: more role backend and admin/writer roles additions and adjustments

api/pkg/access/access.go

@@ -0,0 +1,34 @@
+package access
+
+import (
+	"RenewCMS/api/pkg/apperr"
+	"RenewCMS/internal/domain/role"
+	"context"
+	"errors"
+	"net/http"
+)
+
+type grantsContextKey struct{}
+
+func NewContext(ctx context.Context, grants role.GrantSet) context.Context {
+	return context.WithValue(ctx, grantsContextKey{}, grants)
+}
+
+func Grants(r *http.Request) role.GrantSet {
+	grants, _ := r.Context().Value(grantsContextKey{}).(role.GrantSet)
+	return grants
+}
+
+func WriteMissingPermission(w http.ResponseWriter, key string) {
+	w.Header().Set(apperr.MissingPermissionHeader, key)
+	http.Error(w, apperr.MissingPermissionErrorMessage, http.StatusForbidden)
+}
+
+func WriteIfMissingPermission(w http.ResponseWriter, err error) bool {
+	var missing role.MissingPermissionError
+	if !errors.As(err, &missing) {
+		return false
+	}
+	WriteMissingPermission(w, missing.Key)
+	return true
+}

api/pkg/apperr/messages.go

@@ -24,7 +24,6 @@ const InviteNotFoundErrorMessage = "Invite not found"
 const InviteAlreadyAcceptedErrorMessage = "This invite has already been accepted."
 const InviteInvalidErrorMessage = "This invite link doesn't work."
 const InviteExpiredErrorMessage = "This invite has expired."
-const OwnerRequiredErrorMessage = "Only the owner can do this."
 const UsernameTakenErrorMessage = "That username is taken. Try another."
 const PasswordTooLongErrorMessage = "The password must be 72 bytes or fewer."
 const MediaQueryErrorMessage = "The media query is invalid."
@@ -39,8 +38,9 @@ const UpdateRestartMismatchErrorMessage = "The update state changed. Reload the
 const ArticleBodyFormatErrorMessage = "The format must be one of: markdown, html, json."
 const APIKeyNotFoundErrorMessage = "API key not found"
 const APIKeyExpiryErrorMessage = "The expiry must be a date in the future."
+const MissingPermissionErrorMessage = "missing_permission"
+const MissingPermissionHeader = "X-Missing-Permission"
 const SessionRequiredErrorMessage = "This action needs a real session."
-const OwnerOrAdminRequiredErrorMessage = "Only owners and admins can do this."
 const PurgeConflictErrorMessage = "The library changed, so nothing was purged. Check the new summary and try again."
 const PurgeBusyErrorMessage = "A purge is already running."
 const PurgeIntervalErrorMessage = "Enter a whole number of days between 1 and 365."