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import * as bodyParser from 'body-parser';
import * as cookieParser from 'cookie-parser';
import * as express from 'express';
import * as _ from 'lodash';
import * as multer from 'multer';
import * as metadata from './metadata';
import * as Errors from './server-errors';
import { NextFunction, Request, Response } from 'express';
import { DownloadBinaryData, DownloadResource } from './server-return';
import { FileLimits, HttpMethod, ReferencedResource, ServiceAuthenticator, ServiceContext, ServiceFactory } from './server-types';
export class InternalServer {
public static serverClasses: Map<string, metadata.ServiceClass> = new Map<string, metadata.ServiceClass>();
public static paths: Map<string, Set<HttpMethod>> = new Map<string, Set<HttpMethod>>();
public static pathsResolved: boolean = false;
public static cookiesSecret: string;
public static cookiesDecoder: (val: string) => string;
public static fileDest: string;
public static fileFilter: (req: Express.Request, file: Express.Multer.File, callback: (error: Error, acceptFile: boolean) => void) => void;
public static fileLimits: FileLimits;
public static authenticator: ServiceAuthenticator;
public static serviceFactory: ServiceFactory = {
create: (serviceClass: any) => {
return new serviceClass();
},
getTargetClass: (serviceClass: Function) => {
return serviceClass as FunctionConstructor;
}
};
public static passportStrategy: string;
public static paramConverter: (paramValue: any, paramType: Function) => any = (p, t) => p;
public static registerServiceClass(target: Function): metadata.ServiceClass {
InternalServer.pathsResolved = false;
target = InternalServer.serviceFactory.getTargetClass(target);
const name: string = target['name'] || target.constructor['name'];
if (!InternalServer.serverClasses.has(name)) {
InternalServer.serverClasses.set(name, new metadata.ServiceClass(target));
InternalServer.inheritParentClass(name);
}
const serviceClass: metadata.ServiceClass = InternalServer.serverClasses.get(name);
return serviceClass;
}
public static inheritParentClass(name: string) {
const classData: metadata.ServiceClass = InternalServer.serverClasses.get(name);
const parent = Object.getPrototypeOf(classData.targetClass.prototype).constructor;
const parentClassData: metadata.ServiceClass = InternalServer.getServiceClass(parent);
if (parentClassData) {
Eif (parentClassData.methods) {
parentClassData.methods.forEach((value, key) => {
classData.methods.set(key, _.cloneDeep(value));
});
}
Eif (parentClassData.properties) {
parentClassData.properties.forEach((value, key) => {
classData.properties.set(key, _.cloneDeep(value));
});
}
Eif (parentClassData.languages) {
for (const lang of parentClassData.languages) {
classData.languages.push(lang);
}
}
Eif (parentClassData.accepts) {
for (const acc of parentClassData.accepts) {
classData.accepts.push(acc);
}
}
}
}
public static registerServiceMethod(target: Function, methodName: string): metadata.ServiceMethod {
Eif (methodName) {
InternalServer.pathsResolved = false;
const classData: metadata.ServiceClass = InternalServer.registerServiceClass(target);
if (!classData.methods.has(methodName)) {
classData.methods.set(methodName, new metadata.ServiceMethod());
}
const serviceMethod: metadata.ServiceMethod = classData.methods.get(methodName);
return serviceMethod;
}
return null;
}
public static resolveAllPaths() {
Iif (!InternalServer.pathsResolved) {
InternalServer.paths.clear();
InternalServer.serverClasses.forEach(classData => {
classData.methods.forEach(method => {
if (!method.resolvedPath) {
InternalServer.resolveProperties(classData, method);
}
});
});
InternalServer.pathsResolved = true;
}
}
public static getPaths(): Set<string> {
InternalServer.resolveAllPaths();
const result = new Set<string>();
InternalServer.paths.forEach((value, key) => {
result.add(key);
});
return result;
}
public static getHttpMethods(path: string): Set<HttpMethod> {
InternalServer.resolveAllPaths();
const methods: Set<HttpMethod> = InternalServer.paths.get(path);
return methods || new Set<HttpMethod>();
}
private static getServiceClass(target: Function): metadata.ServiceClass {
target = InternalServer.serviceFactory.getTargetClass(target);
return InternalServer.serverClasses.get(target['name'] || target.constructor['name']) || null;
}
private static resolveLanguages(serviceClass: metadata.ServiceClass,
serviceMethod: metadata.ServiceMethod): void {
const resolvedLanguages = new Array<string>();
Eif (serviceClass.languages) {
serviceClass.languages.forEach(lang => {
resolvedLanguages.push(lang);
});
}
if (serviceMethod.languages) {
serviceMethod.languages.forEach(lang => {
resolvedLanguages.push(lang);
});
}
if (resolvedLanguages.length > 0) {
serviceMethod.resolvedLanguages = resolvedLanguages;
}
}
private static resolveAccepts(serviceClass: metadata.ServiceClass,
serviceMethod: metadata.ServiceMethod): void {
const resolvedAccepts = new Array<string>();
Eif (serviceClass.accepts) {
serviceClass.accepts.forEach(accept => {
resolvedAccepts.push(accept);
});
}
if (serviceMethod.accepts) {
serviceMethod.accepts.forEach(accept => {
resolvedAccepts.push(accept);
});
}
if (resolvedAccepts.length > 0) {
serviceMethod.resolvedAccepts = resolvedAccepts;
}
}
private static resolveProperties(serviceClass: metadata.ServiceClass,
serviceMethod: metadata.ServiceMethod): void {
InternalServer.resolveLanguages(serviceClass, serviceMethod);
InternalServer.resolveAccepts(serviceClass, serviceMethod);
InternalServer.resolvePath(serviceClass, serviceMethod);
}
private static resolvePath(serviceClass: metadata.ServiceClass,
serviceMethod: metadata.ServiceMethod): void {
const classPath: string = serviceClass.path ? serviceClass.path.trim() : '';
let resolvedPath = _.startsWith(classPath, '/') ? classPath : '/' + classPath;
if (_.endsWith(resolvedPath, '/')) {
resolvedPath = resolvedPath.slice(0, resolvedPath.length - 1);
}
if (serviceMethod.path) {
const methodPath: string = serviceMethod.path.trim();
resolvedPath = resolvedPath + (_.startsWith(methodPath, '/') ? methodPath : '/' + methodPath);
}
let declaredHttpMethods: Set<HttpMethod> = InternalServer.paths.get(resolvedPath);
if (!declaredHttpMethods) {
declaredHttpMethods = new Set<HttpMethod>();
InternalServer.paths.set(resolvedPath, declaredHttpMethods);
}
Iif (declaredHttpMethods.has(serviceMethod.httpMethod)) {
throw Error(`Duplicated declaration for path [${resolvedPath}], method [${serviceMethod.httpMethod}].`);
}
declaredHttpMethods.add(serviceMethod.httpMethod);
serviceMethod.resolvedPath = resolvedPath;
}
public router: express.Router;
public upload: multer.Instance;
constructor(router: express.Router) {
this.router = router;
}
public buildServices(types?: Array<Function>) {
Eif (types) {
types = types.map(type => InternalServer.serviceFactory.getTargetClass(type));
}
Eif (InternalServer.authenticator) {
InternalServer.authenticator.initialize(this.router);
}
InternalServer.serverClasses.forEach(classData => {
if (!classData.isAbstract) {
classData.methods.forEach(method => {
if (this.validateTargetType(classData.targetClass, types)) {
this.buildService(classData, method);
}
});
}
});
InternalServer.pathsResolved = true;
this.handleNotAllowedMethods();
}
public async runPreprocessors(processors: Array<Function>, req: express.Request): Promise<void> {
for (const processor of processors) {
await Promise.resolve(processor(req));
}
}
public buildService(serviceClass: metadata.ServiceClass, serviceMethod: metadata.ServiceMethod) {
Eif (!serviceMethod.resolvedPath) {
InternalServer.resolveProperties(serviceClass, serviceMethod);
}
let args: Array<any> = [serviceMethod.resolvedPath];
args = args.concat(this.buildSecurityMiddlewares(serviceClass, serviceMethod));
args = args.concat(this.buildParserMiddlewares(serviceMethod));
args.push(this.buildServiceMiddleware(serviceMethod, serviceClass));
switch (serviceMethod.httpMethod) {
case HttpMethod.GET:
this.router.get.apply(this.router, args);
break;
case HttpMethod.POST:
this.router.post.apply(this.router, args);
break;
case HttpMethod.PUT:
this.router.put.apply(this.router, args);
break;
case HttpMethod.DELETE:
this.router.delete.apply(this.router, args);
break;
case HttpMethod.HEAD:
this.router.head.apply(this.router, args);
break;
case HttpMethod.OPTIONS:
this.router.options.apply(this.router, args);
break;
case HttpMethod.PATCH:
this.router.patch.apply(this.router, args);
break;
default:
throw Error(`Invalid http method for service [${serviceMethod.resolvedPath}]`);
}
}
private validateTargetType(targetClass: Function, types: Array<Function>): boolean {
Eif (types && types.length > 0) {
return (types.indexOf(targetClass) > -1);
}
return true;
}
private handleNotAllowedMethods() {
const paths: Set<string> = InternalServer.getPaths();
paths.forEach((path) => {
const supported: Set<HttpMethod> = InternalServer.getHttpMethods(path);
const allowedMethods: Array<string> = new Array<string>();
supported.forEach((method: HttpMethod) => {
allowedMethods.push(HttpMethod[method]);
});
const allowed: string = allowedMethods.join(', ');
this.router.all(path, (req: express.Request, res: express.Response, next: express.NextFunction) => {
if (res.headersSent || allowedMethods.indexOf(req.method) > -1) {
next();
} else {
res.set('Allow', allowed);
throw new Errors.MethodNotAllowedError();
}
});
});
}
private getUploader(): multer.Instance {
Eif (!this.upload) {
const options: multer.Options = {};
Iif (InternalServer.fileDest) {
options.dest = InternalServer.fileDest;
}
Iif (InternalServer.fileFilter) {
options.fileFilter = InternalServer.fileFilter;
}
Eif (InternalServer.fileLimits) {
options.limits = InternalServer.fileLimits;
}
Iif (options.dest) {
this.upload = multer(options);
} else {
this.upload = multer();
}
}
return this.upload;
}
private buildServiceMiddleware(serviceMethod: metadata.ServiceMethod, serviceClass: metadata.ServiceClass) {
return async (req: express.Request, res: express.Response, next: express.NextFunction) => {
try {
if (serviceMethod.processors || serviceClass.processors) {
const allPreprocessors = [...serviceClass.processors || [], ...serviceMethod.processors || []];
await this.runPreprocessors(allPreprocessors, req);
}
await this.callTargetEndPoint(serviceClass, serviceMethod, req, res, next);
next();
}
catch (err) {
next(err);
}
};
}
private buildSecurityMiddlewares(serviceClass: metadata.ServiceClass, serviceMethod: metadata.ServiceMethod) {
const result: Array<express.RequestHandler> = new Array<express.RequestHandler>();
let roles: Array<string> = [...(serviceMethod.roles || []), ...(serviceClass.roles || [])]
.filter((role) => !!role);
if (InternalServer.authenticator && roles.length) {
result.push(InternalServer.authenticator.getMiddleware());
roles = roles.filter((role) => role !== '*');
if (roles.length) {
result.push((req: Request, res: Response, next: NextFunction) => {
const requestRoles = InternalServer.authenticator.getRoles(req);
if (requestRoles.some((role: string) => roles.indexOf(role) >= 0)) {
next();
} else {
throw new Errors.ForbiddenError();
}
});
}
}
return result;
}
private buildParserMiddlewares(serviceMethod: metadata.ServiceMethod): Array<express.RequestHandler> {
const result: Array<express.RequestHandler> = new Array<express.RequestHandler>();
if (serviceMethod.mustParseCookies) {
const args = [];
Iif (InternalServer.cookiesSecret) {
args.push(InternalServer.cookiesSecret);
}
Iif (InternalServer.cookiesDecoder) {
args.push({ decode: InternalServer.cookiesDecoder });
}
result.push(cookieParser.apply(this, args));
}
if (serviceMethod.mustParseBody) {
if (serviceMethod.bodyParserOptions) {
result.push(bodyParser.json(serviceMethod.bodyParserOptions));
} else {
result.push(bodyParser.json());
}
// TODO adicionar parser de XML para o body
}
if (serviceMethod.mustParseForms || serviceMethod.acceptMultiTypedParam) {
Iif (serviceMethod.bodyParserOptions) {
result.push(bodyParser.urlencoded(serviceMethod.bodyParserOptions));
} else {
result.push(bodyParser.urlencoded({ extended: true }));
}
}
if (serviceMethod.files.length > 0) {
const options: Array<multer.Field> = new Array<multer.Field>();
serviceMethod.files.forEach(fileData => {
Eif (fileData.singleFile) {
options.push({ 'name': fileData.name, 'maxCount': 1 });
} else {
options.push({ 'name': fileData.name });
}
});
result.push(this.getUploader().fields(options));
}
return result;
}
private processResponseHeaders(serviceMethod: metadata.ServiceMethod, context: ServiceContext) {
if (serviceMethod.resolvedLanguages) {
if (serviceMethod.httpMethod === HttpMethod.GET) {
context.response.vary('Accept-Language');
}
context.response.set('Content-Language', context.language);
}
if (serviceMethod.resolvedAccepts) {
context.response.vary('Accept');
}
}
private checkAcceptance(serviceMethod: metadata.ServiceMethod, context: ServiceContext): void {
if (serviceMethod.resolvedLanguages) {
const lang: any = context.request.acceptsLanguages(serviceMethod.resolvedLanguages);
if (lang) {
context.language = lang as string;
}
} else {
const languages: Array<string> = context.request.acceptsLanguages();
Eif (languages && languages.length > 0) {
context.language = languages[0];
}
}
if (serviceMethod.resolvedAccepts) {
const accept: any = context.request.accepts(serviceMethod.resolvedAccepts);
if (accept) {
context.accept = accept as string;
} else {
throw new Errors.NotAcceptableError('Accept');
}
}
if (!context.language) {
throw new Errors.NotAcceptableError('Accept-Language');
}
}
private createService(serviceClass: metadata.ServiceClass, context: ServiceContext) {
const serviceObject = InternalServer.serviceFactory.create(serviceClass.targetClass, context);
if (serviceClass.hasProperties()) {
serviceClass.properties.forEach((property, key) => {
serviceObject[key] = this.processParameter(property.type, context, property.name, property.propertyType);
});
}
return serviceObject;
}
private async callTargetEndPoint(serviceClass: metadata.ServiceClass, serviceMethod: metadata.ServiceMethod,
req: express.Request, res: express.Response, next: express.NextFunction) {
const context: ServiceContext = new ServiceContext();
context.request = req;
context.response = res;
context.next = next;
this.checkAcceptance(serviceMethod, context);
const serviceObject = this.createService(serviceClass, context);
const args = this.buildArgumentsList(serviceMethod, context);
const toCall = serviceClass.targetClass.prototype[serviceMethod.name] || serviceClass.targetClass[serviceMethod.name];
const result = toCall.apply(serviceObject, args);
this.processResponseHeaders(serviceMethod, context);
await this.sendValue(result, res, next);
}
private async sendValue(value: any, res: express.Response, next: express.NextFunction) {
switch (typeof value) {
case 'number':
res.send(value.toString());
break;
case 'string':
res.send(value);
break;
case 'boolean':
res.send(value.toString());
break;
case 'undefined':
Iif (!res.headersSent) {
res.sendStatus(204);
}
break;
default:
if (value.filePath && value instanceof DownloadResource) {
await this.downloadResToPromise(res, value);
} else if (value instanceof DownloadBinaryData) {
Eif (value.fileName) {
res.writeHead(200, {
'Content-Length': value.content.length,
'Content-Type': value.mimeType,
'Content-disposition': 'attachment;filename=' + value.fileName
});
} else {
res.writeHead(200, {
'Content-Length': value.content.length,
'Content-Type': value.mimeType
});
}
res.end(value.content);
} else if (value.location && value instanceof ReferencedResource) {
res.set('Location', value.location);
if (value.body) {
res.status(value.statusCode);
await this.sendValue(value.body, res, next);
} else {
res.sendStatus(value.statusCode);
}
} else if (value.then && value.catch) {
const val = await value;
await this.sendValue(val, res, next);
} else {
res.json(value);
}
}
}
private downloadResToPromise(res: express.Response, value: DownloadResource) {
return new Promise((resolve, reject) => {
res.download(value.filePath, value.filePath, (err) => {
Iif (err) {
reject(err);
} else {
resolve();
}
});
});
}
private buildArgumentsList(serviceMethod: metadata.ServiceMethod, context: ServiceContext) {
const result: Array<any> = new Array<any>();
serviceMethod.parameters.forEach(param => {
result.push(this.processParameter(param.paramType, context, param.name, param.type));
});
return result;
}
private processParameter(paramType: metadata.ParamType, context: ServiceContext, name: string, type: any) {
switch (paramType) {
case metadata.ParamType.path:
return this.convertType(context.request.params[name], type);
case metadata.ParamType.query:
return this.convertType(context.request.query[name], type);
case metadata.ParamType.header:
return this.convertType(context.request.header(name), type);
case metadata.ParamType.cookie:
return this.convertType(context.request.cookies[name], type);
case metadata.ParamType.body:
return this.convertType(context.request.body, type);
case metadata.ParamType.file:
// @ts-ignore
const files: Array<Express.Multer.File> = context.request.files ? context.request.files[name] : null;
Eif (files && files.length > 0) {
return files[0];
}
return null;
case metadata.ParamType.files:
// @ts-ignore
return context.request.files[name];
case metadata.ParamType.form:
return this.convertType(context.request.body[name], type);
case metadata.ParamType.param:
const paramValue = context.request.body[name] ||
context.request.query[name];
return this.convertType(paramValue, type);
case metadata.ParamType.context:
return context;
case metadata.ParamType.context_request:
return context.request;
case metadata.ParamType.context_response:
return context.response;
case metadata.ParamType.context_next:
return context.next;
case metadata.ParamType.context_accept:
return context.accept;
case metadata.ParamType.context_accept_language:
return context.language;
default:
throw Error('Invalid parameter type');
}
}
private convertType(paramValue: string, paramType: Function): any {
const serializedType = paramType['name'];
switch (serializedType) {
case 'Number':
return paramValue === undefined ? paramValue : parseFloat(paramValue);
case 'Boolean':
return paramValue === undefined ? paramValue : paramValue === 'true';
default:
return InternalServer.paramConverter(paramValue, paramType);
}
}
}
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