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// Inspired by: https://github.com/nestjs/nest/blob/cb2af8a3723272bcbacde44dcaadab66a7ec8b7c/packages/core/router/route-alias-resolver.ts |
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import { Injectable } from '@nestjs/common'; |
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import { PATH_METADATA } from '@nestjs/common/constants'; |
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import { isObject } from '@nestjs/common/utils/shared.utils'; |
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import { DiscoveryService } from '@nestjs/core'; |
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import { ROUTE_NAME_METADATA } from './WithName'; |
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@Injectable() |
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export class RouteNameResolver { |
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private readonly nameMap: Map<string, string[]>; |
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constructor(discoveryService: DiscoveryService) { |
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this.nameMap = new Map(); |
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this.init(discoveryService); |
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} |
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private init(discoveryService: DiscoveryService) { |
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const controllers = discoveryService.getControllers(); |
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controllers.forEach(controller => { |
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const basePath: string = Reflect.getMetadata( |
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PATH_METADATA, |
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controller.metatype |
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); |
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const methodNames = Object.getOwnPropertyNames( |
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controller.instance.__proto__ |
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); |
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methodNames.forEach(methodName => { |
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const method = controller.instance.__proto__[methodName]; |
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const name: string | undefined = Reflect.getMetadata( |
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ROUTE_NAME_METADATA, |
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method |
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); |
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if (name) { |
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const path: string = Reflect.getMetadata(PATH_METADATA, method); |
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this.register(name, basePath, [path]); |
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} |
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}); |
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}); |
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} |
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public register(name: string, basePath: string, path: string[]) { |
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if (this.nameMap.has(name)) { |
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throw new Error(`Conflict ${name} already registered`); |
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} |
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this.nameMap.set(name, this.createPath(basePath, path)); |
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} |
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private resolveParamsInPart(part: string, params?: object): string { |
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if (!isObject(params)) { |
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return part; |
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} |
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// [':startDate', ':endDate'] |
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const paramNames = part.match(/:([a-zA-Z\d]+)/g); |
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if (!paramNames) { |
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return part; |
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} |
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let thePart = part; |
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for (const paramName of paramNames) { |
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const value = params[paramName.replace(':', '')]; |
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if (value) { |
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thePart = thePart.replace(paramName, value); |
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} |
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} |
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return thePart; |
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} |
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public resolve(name: string, params?: object): string { |
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if (!this.nameMap.has(name)) { |
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throw new Error(`Not Found: ${name} not registered`); |
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} |
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const path = this.nameMap.get(name).reduce((path, part) => { |
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const thePart = this.resolveParamsInPart(part, params); |
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return thePart ? path + '/' + thePart : path; |
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}, ''); |
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return path ? path : '/'; |
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} |
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public getName(path: string): string | null { |
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const pathWithoutQueryString = path.split('?')[0]; |
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const parts = this.splitPath([pathWithoutQueryString]); |
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const entries = Array.from(this.nameMap.entries()); |
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entries.sort( |
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([, patternA], [, patternB]) => |
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this.splitPath(patternB).length - this.splitPath(patternA).length |
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); |
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const matches = entries.filter(([, pattern]) => { |
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const routeParts = this.splitPath(pattern); |
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if (routeParts.length !== parts.length) { |
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return false; |
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} |
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for (let index = 0; index < parts.length; index++) { |
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const partLeft = parts[index]; |
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const partRight = routeParts[index]; |
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if (partLeft !== partRight && !partRight.startsWith(':')) { |
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return false; |
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} |
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} |
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return true; |
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}); |
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if (matches.length === 0) { |
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return null; |
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} |
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return matches[0][0]; |
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} |
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private createPath(basePath: string, path: string[]): string[] { |
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const base = basePath ? [this.stripSlashes(basePath)] : []; |
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return base.concat(this.splitPath(path)); |
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} |
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private splitPath(path: string[]): string[] { |
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const pathParts = []; |
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path.forEach(part => { |
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part.split('/').forEach(partial => { |
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partial && pathParts.push(this.stripSlashes(partial)); |
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}); |
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}); |
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return pathParts; |
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} |
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private stripSlashes(str: string) { |
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return str.replace(/^\/?(.*)\/?$/, '$1'); |
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} |
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} |
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fairnesscoop /
permacoop
