feat: Add openapi-generator

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "openapi-generator/src"]
+	path = openapi-generator/src
+	url = https://github.com/OpenAPITools/openapi-generator.git

openapi-generator/Dockerfile

@@ -0,0 +1,54 @@
+FROM alpine:3.12
+
+RUN set -x && \
+    apk add --no-cache bash ca-certificates git icu-dev python3-dev openssl nodejs npm openjdk8 && \
+    update-ca-certificates
+
+ENV MAVEN_VERSION=3.6.3
+ENV MAVEN_HOME=/usr/share/maven
+
+# Installing dependencies
+RUN python3 -m ensurepip --upgrade && \
+    pip3 install prance[osv,cli] && \
+    npm install -g typescript yarn
+
+# Installing maven
+RUN cd /tmp \
+   && wget https://archive.apache.org/dist/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz \
+   && wget https://archive.apache.org/dist/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz.sha512 \
+   && echo -e "$(cat apache-maven-$MAVEN_VERSION-bin.tar.gz.sha512)  apache-maven-$MAVEN_VERSION-bin.tar.gz" | sha512sum -c - \
+   && tar zxf apache-maven-$MAVEN_VERSION-bin.tar.gz \
+   && rm -rf apache-maven-$MAVEN_VERSION-bin.tar.gz \
+   && rm -rf *.sha1 \
+   && mv ./apache-maven-$MAVEN_VERSION /usr/share/maven \
+   && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
+
+ENV GEN_DIR /opt/openapi-generator
+WORKDIR ${GEN_DIR}
+VOLUME  ${MAVEN_HOME}/.m2/repository
+
+# Required from a licensing standpoint
+COPY src/LICENSE ${GEN_DIR}
+
+# Required to compile openapi-generator
+COPY src/google_checkstyle.xml ${GEN_DIR}
+
+# Modules are copied individually here to allow for caching of docker layers between major.minor versions
+COPY src/modules/openapi-generator-gradle-plugin ${GEN_DIR}/modules/openapi-generator-gradle-plugin
+COPY src/modules/openapi-generator-maven-plugin ${GEN_DIR}/modules/openapi-generator-maven-plugin
+COPY src/modules/openapi-generator-online ${GEN_DIR}/modules/openapi-generator-online
+COPY src/modules/openapi-generator-cli ${GEN_DIR}/modules/openapi-generator-cli
+COPY src/modules/openapi-generator-core ${GEN_DIR}/modules/openapi-generator-core
+COPY src/modules/openapi-generator ${GEN_DIR}/modules/openapi-generator
+COPY src/pom.xml ${GEN_DIR}
+
+# Pre-compile openapi-generator-cli
+RUN mvn -am -pl "modules/openapi-generator-cli" package
+
+# This exists at the end of the file to benefit from cached layers when modifying docker-entrypoint.sh.
+COPY src/docker-entrypoint.sh /usr/local/bin/
+RUN ln -s /usr/local/bin/docker-entrypoint.sh /usr/local/bin/openapi-generator
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+
+CMD ["help"]