Handle google/protobuf/wrappers.proto types on protoc-gen-openapi

[galihputera]

According to https://developers.google.com/protocol-buffers/docs/proto3#json, Wrapper Types use the same representation in JSON as the wrapped primitive type. On this MR I Modify protoc-gen-openapi code to be able to parse Wrapper Types on schema and parameters.

Also in this MR is changes to map google.protobuf.Timestamp field into string when used as URL query parameters. Previously it will be mapped into two separate fields, for example timestamp_type will mapped into timestampType.seconds and timestampType.nanos

Manual Testing

Unit Test

Steps

make all
go test ./...

Result

ok      github.com/google/gnostic       0.702s
?       github.com/google/gnostic/cmd/disco     [no test files]
?       github.com/google/gnostic/cmd/parse-linter-output       [no test files]
ok      github.com/google/gnostic/cmd/petstore-builder  0.468s
ok      github.com/google/gnostic/cmd/protoc-gen-jsonschema     0.745s
?       github.com/google/gnostic/cmd/protoc-gen-jsonschema/generator   [no test files]
ok      github.com/google/gnostic/cmd/protoc-gen-openapi        1.900s
?       github.com/google/gnostic/cmd/protoc-gen-openapi/generator      [no test files]
?       github.com/google/gnostic/cmd/protoc-gen-openapi/generator/wellknown    [no test files]
?       github.com/google/gnostic/cmd/report    [no test files]
?       github.com/google/gnostic/cmd/report-messages   [no test files]
?       github.com/google/gnostic/cmd/vocabulary-operations     [no test files]
ok      github.com/google/gnostic/compiler      0.110s
?       github.com/google/gnostic/conversions   [no test files]
ok      github.com/google/gnostic/discovery     0.375s
ok      github.com/google/gnostic/extensions    0.302s
?       github.com/google/gnostic/extensions/sample/generated/gnostic-x-sampleone       [no test files]
?       github.com/google/gnostic/extensions/sample/generated/gnostic-x-sampleone/proto [no test files]
?       github.com/google/gnostic/extensions/sample/generated/gnostic-x-sampletwo       [no test files]
?       github.com/google/gnostic/extensions/sample/generated/gnostic-x-sampletwo/proto [no test files]
ok      github.com/google/gnostic/generate-gnostic      1.077s
?       github.com/google/gnostic/jsonschema    [no test files]
ok      github.com/google/gnostic/jsonwriter    1.077s
?       github.com/google/gnostic/lib   [no test files]
?       github.com/google/gnostic/linters/go/gnostic-lint-descriptions  [no test files]
?       github.com/google/gnostic/linters/go/gnostic-lint-paths [no test files]
?       github.com/google/gnostic/metrics       [no test files]
?       github.com/google/gnostic/metrics/lint  [no test files]
?       github.com/google/gnostic/metrics/metrics       [no test files]
ok      github.com/google/gnostic/metrics/rules 0.779s
ok      github.com/google/gnostic/metrics/sourceinfo    0.927s
ok      github.com/google/gnostic/metrics/vocabulary    0.773s
ok      github.com/google/gnostic/openapiv2     0.596s
ok      github.com/google/gnostic/openapiv3     0.500s
?       github.com/google/gnostic/openapiv3/schema-generator    [no test files]
ok      github.com/google/gnostic/plugins       0.453s
?       github.com/google/gnostic/plugins/gnostic-analyze       [no test files]
?       github.com/google/gnostic/plugins/gnostic-analyze/statistics    [no test files]
?       github.com/google/gnostic/plugins/gnostic-analyze/summarize     [no test files]
ok      github.com/google/gnostic/plugins/gnostic-complexity    0.214s
?       github.com/google/gnostic/plugins/gnostic-linter        [no test files]
?       github.com/google/gnostic/plugins/gnostic-plugin-request        [no test files]
?       github.com/google/gnostic/plugins/gnostic-process-plugin-response       [no test files]
?       github.com/google/gnostic/plugins/gnostic-summary       [no test files]
ok      github.com/google/gnostic/plugins/gnostic-vocabulary    0.166s
?       github.com/google/gnostic/printer       [no test files]
?       github.com/google/gnostic/surface       [no test files]
?       github.com/google/gnostic/tools/format-schema   [no test files]
?       github.com/google/gnostic/tools/j2y2j   [no test files]

Check generated openapi using Swagger UI

Command

cd cmd/protoc-gen-openapi
protoc -I ../../ -I ../../third_party -I examples examples/tests/protobuftypes/message.proto --openapi_out=naming=proto:.
docker run -p 8080:8080 -e SWAGGER_JSON=/api.yaml -v $(pwd)/openapi.yaml:/api.yaml swaggerapi/swagger-ui

Result on Query String

Result on Schema

[chaayac]

looks good, you should add the test outputs to the upstream as well.