fix: handling of map entries with omitted key or value #1348
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src/decoder.js
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| if (type === "string") gen | ||
| ("value=\"%s\"", types.defaults[type]); | ||
| else if (types.defaults[type] !== undefined) gen | ||
| ("value=%s", types.defaults[type]); |
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if type === "bytes" then this tries to insert the default value of an empty array with %s and it ends up inserting empty string "" instead of "[]". This is because %s calls String([]) when we need %j here so we use JSON.stringify([]).
According to [1], map encoding must be compatible with a repeated message using indices 1 and 2 for key and value. In particular this implies that both key and value may be omitted when they are equal to the default value - which some protobuf implementations like protobuf-c actually do. The comments in the added testcase are based on the output of protobuf-inspector [2]. [1] https://developers.google.com/protocol-buffers/docs/proto3#backwards-compatibility [2] https://github.com/jmendeth/protobuf-inspector Based-on-patch-by: Shrimpz <Shrimpz@qq.com>
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@schiffermtq Thank you so much for this PR! This should also fix #1293 |
This was referenced Feb 13, 2020
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@nicolasnoble @alexander-fenster Anything we can do to get this PR reviewed/merged? |
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Bump. |
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YES! Thank you so much. |
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According to [1], map encoding must be compatible with a repeated message using indices 1 and 2 for key and value. In particular this implies that both key and value may be omitted when they are equal to the default value - which some protobuf implementations like protobuf-c actually do. The comments in the added testcase are based on the output of protobuf-inspector [2]. [1] https://developers.google.com/protocol-buffers/docs/proto3#backwards-compatibility [2] https://github.com/jmendeth/protobuf-inspector Based-on-patch-by: Shrimpz <Shrimpz@qq.com> Co-authored-by: Alexander Fenster <fenster@google.com>
This was referenced May 20, 2022
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According to [1], map encoding must be compatible with a repeated message
using indices 1 and 2 for key and value. In particular this implies that
both key and value may be omitted when they are equal to the default
value - which some protobuf implementations like protobuf-c actually do.
The comments in the added testcase are based on the output of
protobuf-inspector [2].
[1] https://developers.google.com/protocol-buffers/docs/proto3#backwards-compatibility
[2] https://github.com/jmendeth/protobuf-inspector
This is a cleaned up version of #1087:
Supersedes #845
Supersedes #1087
Fixes #843
Fixes #960
Fixes #1087