1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269 | 1x
1x
1x
1x
1x
1x
1x
1x
34x
34x
34x
34x
34x
34x
34x
34x
34x
34x
6x
6x
6x
6x
6x
6x
6x
6x
6x
6x
4x
6x
6x
6x
6x
6x
6x
2x
2x
6x
2x
2x
2x
2x
6x
6x
6x
7x
7x
11x
11x
11x
11x
1x
1x
1x
10x
10x
4x
10x
3x
1x
1x
8x
5x
3x
7x
1x
1x
1x
7x
7x
2x
4x
4x
4x
4x
7x
8x
8x
8x
8x
1x
1x
1x
7x
3x
3x
| import {
ForbiddenException,
HttpServer,
ParamData,
PipeTransform,
RequestMethod,
} from '@nestjs/common';
import {
CUSTOM_ROUTE_AGRS_METADATA,
HEADERS_METADATA,
HTTP_CODE_METADATA,
RENDER_METADATA,
ROUTE_ARGS_METADATA,
} from '@nestjs/common/constants';
import { RouteParamsMetadata } from '@nestjs/common/decorators';
import { RouteParamtypes } from '@nestjs/common/enums/route-paramtypes.enum';
import { Controller, Transform } from '@nestjs/common/interfaces';
import {
isEmpty,
isFunction,
isString,
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 { ContextUtils } from '../helpers/context-utils';
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 { IRouteParamsFactory } from './interfaces/route-params-factory.interface';
import {
CustomHeader,
RouterResponseController,
} from './router-response-controller';
export interface ParamProperties {
index: number;
type: RouteParamtypes | string;
data: ParamData;
pipes: PipeTransform[];
extractValue: (req, res, next) => any;
}
export class RouterExecutionContext {
private readonly contextUtils = new ContextUtils();
private readonly responseController: RouterResponseController;
constructor(
private readonly paramsFactory: IRouteParamsFactory,
private readonly pipesContextCreator: PipesContextCreator,
private readonly pipesConsumer: PipesConsumer,
private readonly guardsContextCreator: GuardsContextCreator,
private readonly guardsConsumer: GuardsConsumer,
private readonly interceptorsContextCreator: InterceptorsContextCreator,
private readonly interceptorsConsumer: InterceptorsConsumer,
private readonly applicationRef: HttpServer,
) {
this.responseController = new RouterResponseController(applicationRef);
}
public create(
instance: Controller,
callback: (...args) => any,
methodName: string,
module: string,
requestMethod: RequestMethod,
) {
const metadata =
this.contextUtils.reflectCallbackMetadata(
instance,
methodName,
ROUTE_ARGS_METADATA,
) || {};
const keys = Object.keys(metadata);
const argsLength = this.contextUtils.getArgumentsLength(keys, metadata);
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 httpCode = this.reflectHttpStatusCode(callback);
const paramsMetadata = this.exchangeKeysForValues(keys, metadata, module);
const isResponseHandled = paramsMetadata.some(
({ type }) =>
type === RouteParamtypes.RESPONSE || type === RouteParamtypes.NEXT,
);
const paramsOptions = this.contextUtils.mergeParamsMetatypes(
paramsMetadata,
paramtypes,
);
const httpStatusCode = httpCode
? httpCode
: this.responseController.getStatusByMethod(requestMethod);
const fnCanActivate = this.createGuardsFn(guards, instance, callback);
const fnApplyPipes = this.createPipesFn(pipes, paramsOptions);
const fnHandleResponse = this.createHandleResponseFn(
callback,
isResponseHandled,
httpStatusCode,
);
const handler = (args, req, res, next) => async () => {
fnApplyPipes && (await fnApplyPipes(args, req, res, next));
return callback.apply(instance, args);
};
return async (req, res, next) => {
const args = this.contextUtils.createNullArray(argsLength);
fnCanActivate && (await fnCanActivate([req, res]));
const result = await this.interceptorsConsumer.intercept(
interceptors,
[req, res],
instance,
callback,
handler(args, req, res, next),
);
await fnHandleResponse(result, res);
};
}
public reflectHttpStatusCode(callback: (...args) => any): number {
return Reflect.getMetadata(HTTP_CODE_METADATA, callback);
}
public reflectRenderTemplate(callback): string {
return Reflect.getMetadata(RENDER_METADATA, callback);
}
public reflectResponseHeaders(callback): CustomHeader[] {
return Reflect.getMetadata(HEADERS_METADATA, callback) || [];
}
public exchangeKeysForValues(
keys: string[],
metadata: RouteParamsMetadata,
moduleContext: string,
): 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 = (req, res, next) =>
this.paramsFactory.exchangeKeyForValue(numericType, data, {
req,
res,
next,
});
return { index, extractValue, type: numericType, data, pipes };
});
}
public getCustomFactory(factory: (...args) => void, data): (...args) => any {
return isFunction(factory)
? (req, res, next) => factory(data, req)
: () => null;
}
public async getParamValue<T>(
value: T,
{ metatype, type, data },
transforms: Transform<any>[],
): Promise<any> {
if (
type === RouteParamtypes.BODY ||
type === RouteParamtypes.QUERY ||
type === RouteParamtypes.PARAM ||
isString(type)
) {
return this.pipesConsumer.apply(
value,
{ metatype, type, data },
transforms,
);
}
return Promise.resolve(value);
}
public createGuardsFn(
guards: any[],
instance: Controller,
callback: (...args) => any,
): Function | null {
const canActivateFn = async (args: any[]) => {
const canActivate = await this.guardsConsumer.tryActivate(
guards,
args,
instance,
callback,
);
Eif (!canActivate) {
throw new ForbiddenException(FORBIDDEN_MESSAGE);
}
};
return guards.length ? canActivateFn : null;
}
public createPipesFn(
pipes: any[],
paramsOptions: (ParamProperties & { metatype?: any })[],
) {
const pipesFn = async (args, req, res, next) => {
await Promise.all(
paramsOptions.map(async param => {
const {
index,
extractValue,
type,
data,
metatype,
pipes: paramPipes,
} = param;
const value = extractValue(req, res, next);
args[index] = await this.getParamValue(
value,
{ metatype, type, data },
pipes.concat(paramPipes),
);
}),
);
};
return paramsOptions.length ? pipesFn : null;
}
public createHandleResponseFn(
callback,
isResponseHandled: boolean,
httpStatusCode: number,
) {
const renderTemplate = this.reflectRenderTemplate(callback);
const responseHeaders = this.reflectResponseHeaders(callback);
const hasCustomHeaders = !isEmpty(responseHeaders);
if (renderTemplate) {
return async (result, res) => {
hasCustomHeaders &&
this.responseController.setHeaders(res, responseHeaders);
await this.responseController.render(result, res, renderTemplate);
};
}
return async (result, res) => {
hasCustomHeaders &&
this.responseController.setHeaders(res, responseHeaders);
!isResponseHandled &&
(await this.responseController.apply(result, res, httpStatusCode));
};
}
}
|