[Scala][sttp] various bug fixes

[smiklos]

There are a couple of issues with the sttp codegen support.

1. enum should not be used as it will be a reserved keyword -> changed this in JsonSupport
2. Enums were completely missed and not generated at all -> Fixed
3. AnyType was added as value type for maps where the schema type is object. These should be encoded as a json library specific json value (personal opinion)
4. URI serializer is added to support URI as well.

PR checklist

• Read the contribution guidelines.
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  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

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[smiklos]

@clasnake (2017/07), @jimschubert (2017/09) heart, @shijinkui (2018/01), @ramzimaalej (2018/03), @chameleon82 (2020/03), @Bouillie (2020/04)

[smiklos]

merge-swagger.yaml.gz
This is the schema I used , has plenty of enums.

The petstore example generates an enum but no Json4s or circe enums are generated at all. The deafult is json4s which would only fail runtime but circe doesn't even compile in this case.

[chameleon82]

Hi @smiklos,
Thank you for the PR! Looks good to me.

[wing328]

@smiklos thanks again for the PR.

I've filed #13235 to fix a minor bug.

I tried the circe json library but the output doesn't compile:

[error] /private/tmp/scala-sttp/src/main/scala/org/openapitools/client/api/UserApi.scala:64:12: No implicit view available from Seq[org.openapitools.client.model.User] => sttp.client3.BasicRequestBody.
[error]       .body(user)
[error]            ^
[error] /private/tmp/scala-sttp/src/main/scala/org/openapitools/client/api/UserApi.scala:84:12: No implicit view available from Seq[org.openapitools.client.model.User] => sttp.client3.BasicRequestBody.
[error]       .body(user)
[error]            ^
[error] /private/tmp/scala-sttp/src/main/scala/org/openapitools/client/api/UserApi.scala:122:23: could not find implicit value for evidence parameter of type io.circe.Decoder[org.openapitools.client.model.User]
[error]       .response(asJson[User])
[error]                       ^
[error] /private/tmp/scala-sttp/src/main/scala/org/openapitools/client/api/UserApi.scala:181:12: No implicit view available from org.openapitools.client.model.User => sttp.client3.BasicRequestBody.
[error]       .body(user)
[error]            ^
[error] 18 errors found
[error] (Compile / compileIncremental) Compilation failed
[error] Total time: 11 s, completed 20 Aug 2022, 2:42:49 PM

Does it work for you?

To repeat the issue, generate the code with:

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g scala-sttp -i modules/openapi-generator/src/test/resources/3_0/petstore.yaml -o /tmp/scala-sttp/ --additional-properties jsonLibrary=circe

and then run the following under `tmp/-scala-sttp/

sbt test