SOAP-to-RESTを使用して移行と統合を簡素化する

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Header></SOAP-ENV:Header>
  <SOAP-ENV:Body>
    <ns2:getCountryResponse xmlns:ns2="http://spring.io/guides/gs-producing-web-service">
      <ns2:country>
        <ns2:name>Spain</ns2:name>
        <ns2:population>46704314</ns2:population>
        <ns2:capital>Madrid</ns2:capital>
        <ns2:currency>EUR</ns2:currency>
      </ns2:country>
    </ns2:getCountryResponse>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

req_template=$(cat <<EOF | awk '{gsub(/"/,"\\\"");};1' | awk '{$1=$1};1' | tr -d '\r\n'
<?xml version="1.0"?>
<soap-env:Envelope xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
 <soap-env:Body>
  <ns0:getCountryRequest xmlns:ns0="http://spring.io/guides/gs-producing-web-service">
   <ns0:name>{{_escape_xml(name)}}</ns0:name>
  </ns0:getCountryRequest>
 </soap-env:Body>
</soap-env:Envelope>
EOF
)

rsp_template=$(cat <<EOF | awk '{gsub(/"/,"\\\"");};1' | awk '{$1=$1};1' | tr -d '\r\n'
{% if Envelope.Body.Fault == nil then %}
{
   "currency":"{{Envelope.Body.getCountryResponse.country.currency}}",
   "population":{{Envelope.Body.getCountryResponse.country.population}},
   "capital":"{{Envelope.Body.getCountryResponse.country.capital}}",
   "name":"{{Envelope.Body.getCountryResponse.country.name}}"
}
{% else %}
{
   "message":{*_escape_json(Envelope.Body.Fault.faultstring[1])*},
   "code":"{{Envelope.Body.Fault.faultcode}}"
   {% if Envelope.Body.Fault.faultactor ~= nil then %}
   , "actor":"{{Envelope.Body.Fault.faultactor}}"
   {% end %}
}
{% end %}
EOF
)

curl http://127.0.0.1:9180/apisix/admin/routes/1 \
    -H 'X-API-KEY: xxx' -X PUT -d '
{
    "methods": ["POST"],
    "uri": "/ws/getCountry",
    "plugins": {
        "body-transformer": {
            "request": {
                "template": "'"$req_template"'"
            },
            "response": {
                "template": "'"$rsp_template"'"
            }
        }
    },
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "localhost:8080": 1
        }
    }
}'
curl -s http://127.0.0.1:9080/ws/getCountry \
    -H 'content-type: application/json' \
    -X POST -d '{"name": "Spain"}' | jq
{
  "currency": "EUR",
  "population": 46704314,
  "capital": "Madrid",
  "name": "Spain"
}
# Fault response
{
  "message": "Your name is required.",
  "code": "SOAP-ENV:Server"
}

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-codegen-plugin</artifactId>
      <executions>
        <execution>
          <id>generate-sources</id>
          <phase>generate-sources</phase>
          <configuration>
            <wsdlOptions>
              <wsdlOption>
                <wsdl>src/main/resources/TempConverter.wsdl</wsdl>
              </wsdlOption>
            </wsdlOptions>
          </configuration>
          <goals>
            <goal>wsdl2java</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

import com.learnwebservices.services.tempconverter.TempConverterEndpoint;
@Configuration
public class CxfBeans {
    @Value("${endpoint.wsdl}")
    private String SOAP_URL;
    @Bean(name = "cxfConvertTemp")
    public CxfEndpoint buildCxfEndpoint() {
        CxfEndpoint cxf = new CxfEndpoint();
        cxf.setAddress(SOAP_URL);
        cxf.setServiceClass(TempConverterEndpoint.class);
        return cxf;
    }
}

rest("/convert")
    .get("/celsius/to/fahrenheit/{num}")
    .consumes("text/plain").produces("text/plain")
    .description("Convert a temperature in Celsius to Fahrenheit")
    .param().name("num").type(RestParamType.path).description("Temperature in Celsius").dataType("int").endParam()
    .to("direct:celsius-to-fahrenheit");

from("direct:celsius-to-fahrenheit")
    .removeHeaders("CamelHttp*")
    .process(new Processor() {
        @Override
        public void process(Exchange exchange) throws Exception {
            // SOAPリクエストを初期化
            // ダウンストリームのパラメータnumをボディに埋め込みます。これは単純なdouble型です。
            CelsiusToFahrenheitRequest c = new CelsiusToFahrenheitRequest();
            c.setTemperatureInCelsius(Double.valueOf(exchange.getIn().getHeader("num").toString()));
            exchange.getIn().setBody(c);
        }
    })
    // SOAP操作と名前空間を指定
    // application.propertiesファイルで定義
    .setHeader(CxfConstants.OPERATION_NAME, constant("{{endpoint.operation.celsius.to.fahrenheit}}"))
    .setHeader(CxfConstants.OPERATION_NAMESPACE, constant("{{endpoint.namespace}}"))
    // WSDLで生成されたSOAPクライアントビーンを使用してパッケージを送信します。
    .to("cxf:bean:cxfConvertTemp")
    .process(new Processor() {
        @Override
        public void process(Exchange exchange) throws Exception {
            // SOAPレスポンスを処理
            // ボディにdouble型の値を埋め込み、文字列に変換します
            // 文字列をダウンストリームに返します
            MessageContentsList response = (MessageContentsList) exchange.getIn().getBody();
            CelsiusToFahrenheitResponse r = (CelsiusToFahrenheitResponse) response.get(0);
            exchange.getIn().setBody("Temp in Farenheit: " + r.getTemperatureInFahrenheit());
        }
    })
    .to("mock:output");

curl localhost:9090/convert/celsius/to/fahrenheit/50
Temp in Farenheit: 122.0

# SOAPプラグインを使用してAPISIXルーティングを設定
# 単一のルートで全ての操作を実行でき、操作名はURLパラメータで指定されます
# これは動的プロキシの利点を反映しており、WSDLファイル内の各操作を手動で解析する必要がありません。
curl http://127.0.0.1:9180/apisix/admin/routes/1 \
    -H 'X-API-KEY: xxx' -X PUT -d '
{
    "methods": ["POST"],
    "uri": "/getCountry",
    "plugins": {
        "soap": {
            "wsdl_url": "http://localhost:8080/ws/countries.wsdl"
        }
    }
}'
curl 'http://127.0.0.1:9080/getCountry' \
    -X POST -d '{"name": "Spain"}'
# 呼び出し成功
HTTP/1.1 200 OK
Date: Tue, 06 Dec 2022 08:07:48 GMT
Content-Type: text/plain; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Server: APISIX/2.99.0
{"currency":"EUR","population":46704314,"capital":"Madrid","name":"Spain"}
# 呼び出し失敗
HTTP/1.1 502 Bad Gateway
Date: Tue, 03 Jan 2023 13:43:33 GMT
Content-Type: text/plain; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Server: APISIX/2.99.0
{"message":"Your name is required.","actor":null,"code":"SOAP-ENV:Server","subcodes":null,"detail":null}