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index.js
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index.js
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const swaggerParser = require('@apidevtools/swagger-parser');
const validator = require('./validator');
function methodValidator(swagger, pathName, methodName, basePath) {
if (!basePath) basePath = swagger.basePath || '';
const path = swagger.paths[pathName.slice(basePath.length)];
const method = path[methodName];
const requestBody = method.requestBody?.content?.['application/json']; // openapi 3
const params = [requestBody && {schema: requestBody.schema, in: 'body'}]
.concat(path.parameters)
.concat(method.parameters)
.filter(x => x)
.map(param => {
const schema = param.schema || (({name, in: ignore, ...schema}) => schema)(param);
if (['query', 'header', 'path'].indexOf(param.in) !== -1) {
param.validate = validator.primitive(schema);
} else if (param.in === 'formData') {
if (param.type === 'file') param.validate = validator.file(schema);
else param.validate = validator.primitive(schema);
} else {
param.validate = validator.json(schema);
}
return param;
});
const responses = Object.entries(method.responses).reduce((all, [status, response]) => {
const schema = response.schema || response.content?.['application/json']?.schema;
return {
...all,
[status]: {
validate: schema ? validator.json(schema) : validator.empty()
}
};
}, {});
const expected = (pathName.match(/[^/]+/g) || []).map(s => s.toString());
return {
request: async function validateRequest({
query = {},
body = {},
files = {},
pathParameters = {},
headers = {},
path = ''
}) {
const errors = [];
if (params.length === 0) {
const { error } = await validator.empty()(body);
if (error) {
error.where = 'body';
errors.push(error);
}
Object.keys(query).forEach(name => {
errors.push({
where: 'query',
name,
actual: query[name],
expected: undefined
});
});
} else {
let hasBody = false;
for (let i = 0; i < params.length; i += 1) {
let value;
const param = params[i];
let validate = param.validate;
switch (param.in) {
case 'header':
value = headers[param.name];
break;
case 'query':
value = query[param.name];
validate = async value => {
const validation = await param.validate(value);
// reassign value if casted. E.g. 'true' -> true or '1' -> 1
if (validation.result !== value) query[param.name] = validation.result;
return validation;
};
break;
case 'path':
if (path) {
const actual = path.substring(basePath.length).match(/[^/]+/g);
value = actual ? actual[expected.indexOf(`{${param.name}}`)] : undefined;
} else {
value = pathParameters[param.name];
validate = async value => {
const validation = await param.validate(value);
// reassign value if casted. E.g. 'true' -> true or '1' -> 1
if (validation.result !== value) pathParameters[param.name] = validation.result;
return validation;
};
}
break;
case 'formData':
value = param.type === 'file' ? files[param.name] : body[param.name];
hasBody = true;
break;
case 'body':
value = body;
hasBody = true;
break;
}
const { error } = await validate(value);
if (error) {
error.where = param.in;
error.name = param.name;
errors.push(error);
}
}
if (!hasBody) {
const { error } = await validator.empty()(body);
error && errors.push(error);
}
}
return errors;
},
response: async function validateResponse({status, body}) {
const { validate } = responses[status] || responses.default;
const { error } = await validate(body);
return error ? [error] : [];
}
};
}
module.exports = (swaggerDocument, pathName, methodName, basePath) => {
if (pathName && methodName) return methodValidator(swaggerDocument, pathName, methodName, basePath);
return (async() => {
const swagger = await swaggerParser.dereference(swaggerDocument);
return Object.entries(swagger.paths).reduce(
(validators, [pathName, path]) => {
if (!pathName.startsWith('x-')) {
Object.entries(path).forEach(([methodName, method]) => {
if (methodName !== 'parameters' && !methodName.startsWith('x-')) {
let basePath = swagger.swagger && swagger.basePath;
if (swagger.openapi) {
const docUrl = swagger.servers?.[0]?.url;
const schemaUrl = method.servers?.[0]?.url;
basePath = schemaUrl
? schemaUrl.startsWith('/') && schemaUrl
: docUrl?.startsWith('/') && docUrl;
}
if (!basePath) basePath = '';
validators[method.operationId] = methodValidator(
swagger,
basePath + pathName,
methodName,
basePath
);
}
});
}
return validators;
},
{}
);
})();
};