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protoc-gen-openapiv2: Use the canonical camelCase converter for protobuf #2599

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Mar 21, 2022
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protoc-gen-openapiv2: Use the canonical camelCase converter for protobuf #2599

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d6949db
Use the canonical camelCase converter for protobuf. Fixes issue #2363.
oyvindwe Mar 21, 2022
3560f03
Revert change that should go in separate PR
oyvindwe Mar 21, 2022
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2 changes: 1 addition & 1 deletion internal/casing/LICENSE.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
Copyright 2010 The Go Authors. All rights reserved.
Copyright 2010, 2019 The Go Authors. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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8 changes: 5 additions & 3 deletions internal/casing/README.md
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@@ -1,5 +1,7 @@
# Case conversion

This package contains a single function, copied from the
`github.com/golang/protobuf/protoc-gen-go/generator` package. That
modules LICENSE is referenced in its entirety in this package.
This package contains two functions:
- `Camel` copied from the `github.com/golang/protobuf/protoc-gen-go/generator` package.
- `JSONCamelCase` copied from the `github.com/protocolbuffers/protobuf-go/internal/strs` package.

Both these modules are licensed by The Go Authors, as reflected in this package's [LICENSE.md].
18 changes: 18 additions & 0 deletions internal/casing/camel.go
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Expand Up @@ -50,6 +50,24 @@ func Camel(s string) string {
return string(t)
}
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Hm, do we still need the old function? We should probably always use the new one?

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This is not the old one - that was coded inline in template.go.

The Camel method looks more like GoCamel here though: https://github.com/protocolbuffers/protobuf-go/blob/3992ea83a23c00882339f33511074d251e19822c/internal/strs/strings.go#L28-L32

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I expect their logic to be roughly the same, though it might be worth using the new one anyway. We should probably always be consistent with what APIv2 uses (the new repo).

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I'm not sure if I follow you here. Do you mean that Camel should be replaced with GoCamelCase? That method seems to now only be called from protoc-gen-grpc-gateway, which I'm not familiar with (we use ESP).

What do you refer to with "APIv2 uses (the new repo)"?

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I don't think we need to make any changes here, but there may be a subtle bug hidden somewhere here that will eventually rear its head. By APIv2 I mean the Go protobuf stack in google.golang.org/protobuf. That's the "new" stack. See https://blog.golang.org/protobuf-apiv2 for more information. The grpc-gateway v2 is built on APIv2.


// JSONCamelCase converts a snake_case identifier to a camelCase identifier,
// according to the protobuf JSON specification.
func JSONCamelCase(s string) string {
var b []byte
var wasUnderscore bool
for i := 0; i < len(s); i++ { // proto identifiers are always ASCII
c := s[i]
if c != '_' {
if wasUnderscore && isASCIILower(c) {
c -= 'a' - 'A' // convert to uppercase
}
b = append(b, c)
}
wasUnderscore = c == '_'
}
return string(b)
}

// And now lots of helper functions.

// Is c an ASCII lower-case letter?
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14 changes: 3 additions & 11 deletions protoc-gen-openapiv2/internal/genopenapi/template.go
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Expand Up @@ -2523,7 +2523,7 @@ func updateswaggerObjectFromJSONSchema(s *openapiSchemaObject, j *openapi_option
if reg.GetUseJSONNamesForFields() {
for i, r := range s.Required {
// TODO(oyvindwe): Look up field and use field.GetJsonName()?
s.Required[i] = doCamelCase(r)
s.Required[i] = casing.JSONCamelCase(r)
}
}
s.Enum = j.GetEnum()
Expand Down Expand Up @@ -2707,23 +2707,15 @@ func lowerCamelCase(fieldName string, fields []*descriptor.Field, msgs []*descri
fieldNames := strings.Split(fieldName, ".")
fieldNamesWithCamelCase := make([]string, 0)
for i := 0; i < len(fieldNames)-1; i++ {
fieldNamesWithCamelCase = append(fieldNamesWithCamelCase, doCamelCase(string(fieldNames[i])))
fieldNamesWithCamelCase = append(fieldNamesWithCamelCase, casing.JSONCamelCase(string(fieldNames[i])))
}
prefix := strings.Join(fieldNamesWithCamelCase, ".")
reservedJSONName := getReservedJSONName(fieldName, messageNameToFieldsToJSONName, fieldNameToType)
if reservedJSONName != "" {
return prefix + "." + reservedJSONName
}
}
return doCamelCase(fieldName)
}

func doCamelCase(input string) string {
parameterString := casing.Camel(input)
builder := &strings.Builder{}
builder.WriteString(strings.ToLower(string(parameterString[0])))
builder.WriteString(parameterString[1:])
return builder.String()
return casing.JSONCamelCase(fieldName)
}

func getReservedJSONName(fieldName string, messageNameToFieldsToJSONName map[string]map[string]string, fieldNameToType map[string]string) string {
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