# All files / common/decorators/http route-params.decorator.ts

96.97% Statements 32/33
60% Branches 6/10
90% Functions 9/10
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     import { ROUTE_ARGS_METADATA } from '../../constants';
    import { RouteParamtypes } from '../../enums/route-paramtypes.enum';
    import { PipeTransform } from '../../index';
    import { Type } from '../../interfaces';
    import { isNil, isString } from '../../utils/shared.utils';

    export type ParamData = object | string | number;
    export interface RouteParamsMetadata {
      [prop: number]: {
        index: number;
        data?: ParamData;
      };
    }

    const assignMetadata = (
      args: RouteParamsMetadata,
      paramtype: RouteParamtypes,
      index: number,
      data?: ParamData,
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    ) => ({
      ...args,
      [`${paramtype}:${index}`]: {
        index,
        data,
        pipes,
      },
    });

    const createRouteParamDecorator = (paramtype: RouteParamtypes) => {
      return (data?: ParamData): ParameterDecorator => (target, key, index) => {
        const args =
          Reflect.getMetadata(ROUTE_ARGS_METADATA, target.constructor, key) || {};
        Reflect.defineMetadata(
          ROUTE_ARGS_METADATA,
          assignMetadata(args, paramtype, index, data),
          target.constructor,
          key,
        );
      };
    };

    const createPipesRouteParamDecorator = (paramtype: RouteParamtypes) => (
      data?,
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    ): ParameterDecorator => (target, key, index) => {
      const args =
        Reflect.getMetadata(ROUTE_ARGS_METADATA, target.constructor, key) || {};
      const hasParamData = isNil(data) || isString(data);
      const paramData = hasParamData ? data : undefined;
      const paramPipes = hasParamData ? pipes : [data, ...pipes];

      Reflect.defineMetadata(
        ROUTE_ARGS_METADATA,
        assignMetadata(args, paramtype, index, paramData, ...paramPipes),
        target.constructor,
        key,
      );
    };

    export const Request: () => ParameterDecorator = createRouteParamDecorator(
      RouteParamtypes.REQUEST,
    );
    export const Response: () => ParameterDecorator = createRouteParamDecorator(
      RouteParamtypes.RESPONSE,
    );
    export const Next: () => ParameterDecorator = createRouteParamDecorator(
      RouteParamtypes.NEXT,
    );
    export const Session: () => ParameterDecorator = createRouteParamDecorator(
      RouteParamtypes.SESSION,
    );
    export const UploadedFile: (
      fileKey?: string,
    ) => ParameterDecorator = createRouteParamDecorator(RouteParamtypes.FILE);
    export const UploadedFiles: () => ParameterDecorator = createRouteParamDecorator(
      RouteParamtypes.FILES,
    );
    export const Headers: (
      property?: string,
    ) => ParameterDecorator = createRouteParamDecorator(RouteParamtypes.HEADERS);

    export function Query();
    export function Query(...pipes: (Type<PipeTransform> | PipeTransform)[]);
    export function Query(
      property: string,
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    );
    export function Query(
      property?: string | (Type<PipeTransform> | PipeTransform),
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    ) {
      return createPipesRouteParamDecorator(RouteParamtypes.QUERY)(
        property,
        ...pipes,
      );
    }

    export function Body();
    export function Body(...pipes: (Type<PipeTransform> | PipeTransform)[]);
    export function Body(
      property: string,
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    );
    export function Body(
      property?: string | (Type<PipeTransform> | PipeTransform),
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    ) {
      return createPipesRouteParamDecorator(RouteParamtypes.BODY)(
        property,
        ...pipes,
      );
    }

    export function Param();
    export function Param(...pipes: (Type<PipeTransform> | PipeTransform)[]);
    export function Param(
      property: string,
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    );
    export function Param(
      property?: string | (Type<PipeTransform> | PipeTransform),
      ...pipes: (Type<PipeTransform> | PipeTransform)[]
    ) {
      return createPipesRouteParamDecorator(RouteParamtypes.PARAM)(
        property,
        ...pipes,
      );
    }

    export const Req = Request;
    export const Res = Response;