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c51e2e0293
In 2014, when proto3 was being developed, there were a number of early adopters of the new syntax. Before the finalization of proto3 when it was released in open-source in July 2016, a decision was made to strictly validate strings in proto3. However, some of the early adopters were already using invalid UTF-8 with string fields. The google.protobuf.FieldOptions.enforce_utf8 option only exists to support those grandfathered users where they can opt-out of the validation logic. Practical use of that option in open source is impossible even if a user specifies the proto1_legacy build tag since it requires a hacked variant of descriptor.proto that is not externally available. This CL supports enforce_utf8 by modifiyng internal/filedesc to expose the flag if it detects it in the raw descriptor. We add an strs.EnforceUTF8 function as a centralized place to determine whether to perform validation. Validation opt-out is supported only in builds with legacy support. We implement support for validating UTF-8 in all proto3 string fields, even if they are backed by a Go []byte. Change-Id: I9c0628b84909bc7181125f09db730c80d490e485 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/186002 Reviewed-by: Damien Neil <dneil@google.com> |
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