Created
February 5, 2022 11:40
-
-
Save acomagu/813e188fa58055262691d368ff77c91d to your computer and use it in GitHub Desktop.
@auth(role: ...) GraphQL directive implementation in TypeScript.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import { mapSchema, getDirective, MapperKind } from '@graphql-tools/utils'; | |
| import { defaultFieldResolver, GraphQLError, GraphQLFieldResolver, GraphQLSchema } from 'graphql'; | |
| function wrapField<Field extends { resolve?: GraphQLFieldResolver<any, any> }>(field: Field, authDirective: Record<string, any>) { | |
| const { resolve = defaultFieldResolver } = field; | |
| field.resolve = (src, args, ctx, info) => { | |
| if (ctx.role !== authDirective.role) throw new GraphQLError(`${authDirective.role} role is needed but your role is ${ctx.role}.`); | |
| return resolve(src, args, ctx, info); | |
| }; | |
| return field; | |
| } | |
| // Collate "role" field in the context with the @auth directive in resolving. | |
| // | |
| // Expected directive definition: | |
| // `directive @auth(role: Role!) on FIELD_DEFINITION | OBJECT` | |
| export function authDirectiveTransformer(schema: GraphQLSchema) { | |
| return mapSchema(schema, { | |
| [MapperKind.OBJECT_FIELD]: (fieldConfig) => { | |
| const authDirective = getDirective(schema, fieldConfig, 'auth')?.[0]; | |
| if (!authDirective) return; | |
| return wrapField(fieldConfig, authDirective); | |
| }, | |
| [MapperKind.OBJECT_TYPE]: (type) => { | |
| const authDirective = getDirective(schema, type, 'auth')?.[0]; | |
| if (!authDirective) return; | |
| const fields = type.getFields(); | |
| for (const name of Object.keys(fields)) { | |
| fields[name] = wrapField(fields[name], authDirective); | |
| } | |
| return type; | |
| }, | |
| }); | |
| }; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment