91 lines
2.6 KiB
JavaScript
91 lines
2.6 KiB
JavaScript
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'use strict';
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const { GraphQLScalarType, GraphQLError } = require('graphql');
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const Upload = require('./Upload');
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/**
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* A GraphQL `Upload` scalar that can be used in a
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* [`GraphQLSchema`](https://graphql.org/graphql-js/type/#graphqlschema).
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* It’s value in resolvers is a promise that resolves
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* [file upload details]{@link FileUpload} for processing and storage.
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* @kind class
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* @name GraphQLUpload
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* @example <caption>Ways to `import`.</caption>
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* ```js
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* import { GraphQLUpload } from 'graphql-upload';
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* ```
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*
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* ```js
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* import GraphQLUpload from 'graphql-upload/public/GraphQLUpload.js';
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* ```
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* @example <caption>Ways to `require`.</caption>
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* ```js
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* const { GraphQLUpload } = require('graphql-upload');
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* ```
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*
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* ```js
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* const GraphQLUpload = require('graphql-upload/public/GraphQLUpload');
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* ```
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* @example <caption>Setup for a schema built with [`makeExecutableSchema`](https://apollographql.com/docs/graphql-tools/generate-schema#makeExecutableSchema).</caption>
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* ```js
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* const { makeExecutableSchema } = require('graphql-tools');
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* const { GraphQLUpload } = require('graphql-upload');
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*
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* const schema = makeExecutableSchema({
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* typeDefs: /* GraphQL *\/ `
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* scalar Upload
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* `,
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* resolvers: {
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* Upload: GraphQLUpload,
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* },
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* });
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* ```
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* @example <caption>A manually constructed schema with an image upload mutation.</caption>
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* ```js
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* const {
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* GraphQLSchema,
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* GraphQLObjectType,
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* GraphQLBoolean,
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* } = require('graphql');
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* const { GraphQLUpload } = require('graphql-upload');
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*
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* const schema = new GraphQLSchema({
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* mutation: new GraphQLObjectType({
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* name: 'Mutation',
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* fields: {
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* uploadImage: {
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* description: 'Uploads an image.',
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* type: GraphQLBoolean,
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* args: {
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* image: {
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* description: 'Image file.',
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* type: GraphQLUpload,
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* },
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* },
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* async resolve(parent, { image }) {
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* const { filename, mimetype, createReadStream } = await image;
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* const stream = createReadStream();
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* // Promisify the stream and store the file, then…
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* return true;
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* },
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* },
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* },
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* }),
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* });
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* ```
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*/
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module.exports = new GraphQLScalarType({
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name: 'Upload',
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description: 'The `Upload` scalar type represents a file upload.',
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parseValue(value) {
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if (value instanceof Upload) return value.promise;
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throw new GraphQLError('Upload value invalid.');
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},
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parseLiteral(ast) {
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throw new GraphQLError('Upload literal unsupported.', ast);
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},
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serialize() {
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throw new GraphQLError('Upload serialization unsupported.');
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},
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});
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