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| import { ForbiddenException, ParamData } from '@nestjs/common';
import { CUSTOM_ROUTE_AGRS_METADATA } from '@nestjs/common/constants';
import { Controller, Transform } from '@nestjs/common/interfaces';
import { isFunction, isUndefined } from '@nestjs/common/utils/shared.utils';
import { FORBIDDEN_MESSAGE } from '../guards/constants';
import { GuardsConsumer } from '../guards/guards-consumer';
import { GuardsContextCreator } from '../guards/guards-context-creator';
import { NestContainer } from '../injector/container';
import { Module } from '../injector/module';
import { ModulesContainer } from '../injector/modules-container';
import { InterceptorsConsumer } from '../interceptors/interceptors-consumer';
import { InterceptorsContextCreator } from '../interceptors/interceptors-context-creator';
import { PipesConsumer } from '../pipes/pipes-consumer';
import { PipesContextCreator } from '../pipes/pipes-context-creator';
import { ContextUtils, ParamProperties } from './context-utils';
export interface ParamsMetadata {
[prop: number]: {
index: number;
data?: ParamData;
};
}
export interface ParamsFactory {
exchangeKeyForValue(type: number, data: ParamData, args: any): any;
}
export class ExternalContextCreator {
private readonly contextUtils = new ContextUtils();
constructor(
private readonly guardsContextCreator: GuardsContextCreator,
private readonly guardsConsumer: GuardsConsumer,
private readonly interceptorsContextCreator: InterceptorsContextCreator,
private readonly interceptorsConsumer: InterceptorsConsumer,
private readonly modulesContainer: ModulesContainer,
private readonly pipesContextCreator: PipesContextCreator,
private readonly pipesConsumer: PipesConsumer,
) {}
static fromContainer(container: NestContainer): ExternalContextCreator {
return new ExternalContextCreator(
new GuardsContextCreator(container, container.applicationConfig),
new GuardsConsumer(),
new InterceptorsContextCreator(container, container.applicationConfig),
new InterceptorsConsumer(),
container.getModules(),
new PipesContextCreator(container, container.applicationConfig),
new PipesConsumer(),
);
}
public create<T extends ParamsMetadata = ParamsMetadata>(
instance: Controller,
callback: (...args) => any,
methodName: string,
metadataKey?: string,
paramsFactory?: ParamsFactory,
) {
const module = this.findContextModuleName(instance.constructor);
const pipes = this.pipesContextCreator.create(instance, callback, module);
const paramtypes = this.contextUtils.reflectCallbackParamtypes(
instance,
methodName,
);
const guards = this.guardsContextCreator.create(instance, callback, module);
const interceptors = this.interceptorsContextCreator.create(
instance,
callback,
module,
);
const metadata =
this.contextUtils.reflectCallbackMetadata<T>(
instance,
methodName,
metadataKey || '',
) || {};
const keys = Object.keys(metadata);
const argsLength = this.contextUtils.getArgumentsLength(keys, metadata);
const paramsMetadata = paramsFactory
? this.exchangeKeysForValues(keys, metadata, module, paramsFactory)
: null;
const paramsOptions = paramsMetadata
? this.contextUtils.mergeParamsMetatypes(paramsMetadata, paramtypes)
: [];
const fnApplyPipes = this.createPipesFn(pipes, paramsOptions);
const handler = (initialArgs, ...args) => async () => {
Iif (fnApplyPipes) {
await fnApplyPipes(initialArgs, ...args);
return callback.apply(instance, initialArgs);
}
return callback.apply(instance, args);
};
return async (...args) => {
const initialArgs = this.contextUtils.createNullArray(argsLength);
const canActivate = await this.guardsConsumer.tryActivate(
guards,
args,
instance,
callback,
);
if (!canActivate) {
throw new ForbiddenException(FORBIDDEN_MESSAGE);
}
const result = await this.interceptorsConsumer.intercept(
interceptors,
args,
instance,
callback,
handler(initialArgs, ...args),
);
return this.transformToResult(result);
};
}
public findContextModuleName(constructor: Function): string {
const className = constructor.name;
if (!className) {
return '';
}
for (const [key, module] of [...this.modulesContainer.entries()]) {
Eif (this.findComponentByClassName(module, className)) {
return key;
}
}
return '';
}
public findComponentByClassName(module: Module, className: string): boolean {
const { components } = module;
const hasComponent = [...components.keys()].some(
component => component === className,
);
return hasComponent;
}
public exchangeKeysForValues<TMetadata = any>(
keys: string[],
metadata: TMetadata,
moduleContext: string,
paramsFactory: ParamsFactory,
): ParamProperties[] {
this.pipesContextCreator.setModuleContext(moduleContext);
return keys.map(key => {
const { index, data, pipes: pipesCollection } = metadata[key];
const pipes = this.pipesContextCreator.createConcreteContext(
pipesCollection,
);
const type = this.contextUtils.mapParamType(key);
if (key.includes(CUSTOM_ROUTE_AGRS_METADATA)) {
const { factory } = metadata[key];
const customExtractValue = this.getCustomFactory(factory, data);
return { index, extractValue: customExtractValue, type, data, pipes };
}
const numericType = Number(type);
const extractValue = (...args) =>
paramsFactory.exchangeKeyForValue(numericType, data, args);
return { index, extractValue, type: numericType, data, pipes };
});
}
public getCustomFactory(factory: (...args) => void, data): (...args) => any {
return isFunction(factory)
? (...args) => factory(data, args)
: () => null;
}
public createPipesFn(
pipes: any[],
paramsOptions: (ParamProperties & { metatype?: any })[],
) {
const pipesFn = async (args, ...gqlArgs) => {
await Promise.all(
paramsOptions.map(async param => {
const {
index,
extractValue,
type,
data,
metatype,
pipes: paramPipes,
} = param;
const value = extractValue(...gqlArgs);
args[index] = await this.getParamValue(
value,
{ metatype, type, data },
pipes.concat(paramPipes),
);
}),
);
};
return paramsOptions.length ? pipesFn : null;
}
public async getParamValue<T>(
value: T,
{ metatype, type, data },
transforms: Transform<any>[],
): Promise<any> {
return this.pipesConsumer.apply(
value,
{ metatype, type, data },
transforms,
);
}
public async transformToResult(resultOrDeffered) {
if (resultOrDeffered && isFunction(resultOrDeffered.subscribe)) {
return resultOrDeffered.toPromise();
}
return resultOrDeffered;
}
}
|