I've got the following protobuf file with protovalidate rules:
syntax = "proto3";
package playground;
import "buf/validate/validate.proto";
import "google/protobuf/timestamp.proto";
import "google/type/datetime.proto";
message BookingTimes {
// checkin_time is the time of entry in the hotel.
google.type.DateTime checkin_time = 1 [(buf.validate.field).required = true];
// checkout_time is the time of leave of the hotel.
// must be after checkin_time.
google.type.DateTime checkout_time = 2;
}How can I write a CEL rule with protovalidate to enforce that checkout_time is after checkin_time?
I understand google.type.DateTime is not a well-known type, so protovalidate doesn't reference those as it does for google.protobuf.Timestamp etc. Still, I couldn't find a well-documented path if I were to write my own set of library rules to distribute internally at my org. I've checked the source for https://github.com/bufbuild/cel-es for how the google.protobuf.Timestamp rules are defined, but also there it is not obvious how one would write custom rules.
I imagine landing on something like:
message BookingTimes {
// checkin_time is the time of entry in the hotel.
google.type.DateTime checkin_time = 1 [(buf.validate.field).required = true];
// checkout_time is the time of leave of the hotel.
// must be after checkin_time.
google.type.DateTime checkout_time = 2 [(buf.validate.field).cel = {
id: "checkout_after_checking"
message: "the checkout must have happened after the check-in"
expression:
"this.checkin_time < this.checkout_time"
}];
}
I've got the following protobuf file with protovalidate rules:
How can I write a CEL rule with protovalidate to enforce that
checkout_timeis aftercheckin_time?I understand
google.type.DateTimeis not a well-known type, so protovalidate doesn't reference those as it does forgoogle.protobuf.Timestampetc. Still, I couldn't find a well-documented path if I were to write my own set of library rules to distribute internally at my org. I've checked the source for https://github.com/bufbuild/cel-es for how thegoogle.protobuf.Timestamprules are defined, but also there it is not obvious how one would write custom rules.I imagine landing on something like: