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/*
* Copyright 2022 predic8 GmbH, www.predic8.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.predic8.membrane.core.openapi;
import com.predic8.membrane.core.openapi.model.*;
import com.predic8.membrane.core.openapi.util.*;
import com.predic8.membrane.core.openapi.validators.*;
import com.predic8.membrane.core.util.*;
import io.swagger.parser.*;
import io.swagger.v3.oas.models.*;
import org.slf4j.*;
import java.io.*;
import java.net.*;
import java.util.*;
import static com.predic8.membrane.core.openapi.util.UriUtil.normalizeUri;
import static com.predic8.membrane.core.openapi.validators.ValidationContext.ValidatedEntityType.*;
import static java.lang.String.*;
public class OpenAPIValidator {
private static final Logger log = LoggerFactory.getLogger(OpenAPIValidator.class.getName());
private final OpenAPI api;
private final URIFactory uriFactory;
private String basePath = "";
public OpenAPIValidator(URIFactory uriFactory, OpenAPI api) {
this.api = api;
this.uriFactory = uriFactory;
init();
}
public OpenAPIValidator(URIFactory uriFactory, InputStream openApiIs) {
api = new OpenAPIParser().readContents(FileUtil.readInputStream(openApiIs), null, null).getOpenAPI();
this.uriFactory = uriFactory;
init();
}
/**
* @TODO Handle basepath also for multiple server entries
*/
private void init() {
if (api.getServers() != null) {
String url = api.getServers().get(0).getUrl();
log.debug("Found server " + url);
try {
basePath = UriUtil.getPathFromURL(uriFactory, url);
} catch (URISyntaxException e) {
// @TODO
throw new RuntimeException("Config Error ", e);
}
}
}
public ValidationErrors validate(Request request) {
return validateMessage(request, null);
}
public ValidationErrors validateResponse(Request request, Response response) {
return validateMessage(request, response);
}
private ValidationErrors validateMessage(Request req, Response res) {
for (Map.Entry path : api.getPaths().entrySet()) {
try {
return validateMethodsAndParametersIfPathMatches(req, res, path.getKey(), path.getValue());
} catch (PathDoesNotMatchException ignored) {
// All paths from the OpenAPI that do not match will cause an exception while parsing the path and parameter. Then the next uriTemplate
// is tried until we get a match or there is no matching path in the OpenAPI.
}
}
return ValidationErrors.create( ValidationContext.fromRequest(req)
.entity(req.getPath())
.entityType(PATH)
.statusCode(404), format("Path %s is invalid.", req.getPath()));
}
private ValidationErrors validateMethodsAndParametersIfPathMatches(Request req, Response response, String uriTemplate, PathItem pathItem) throws PathDoesNotMatchException {
// Throws exception if path or parameters do not match
req.parsePathParameters(normalizeUri(basePath + uriTemplate));
ValidationContext ctx = ValidationContext.fromRequest(req);
ValidationErrors errors = validateMethods(ctx.uriTemplate(uriTemplate), req, response, pathItem);
// If there is no response it is a request by logic, so we validate the request parameters
if (response == null) {
errors.add(new PathParametersValidator(api).validatePathParameters(ctx.uriTemplate(uriTemplate), req, pathItem.getParameters()));
}
return errors;
}
private ValidationErrors validateMethods(ValidationContext ctx, Request req, Response response, PathItem pathItem) {
ValidationErrors errors = new ValidationErrors();
try {
return errors.add(new OperationValidator(api).validateOperation(ctx, req, response, pathItem));
} catch (MethodNotAllowException e) {
return errors.add(ctx.statusCode(405)
.entity(req.getMethod())
.entityType(METHOD), format("Method %s is not allowed", req.getMethod()));
}
}
public OpenAPI getApi() {
return api;
}
}