diff --git a/package-lock.json b/package-lock.json index 0c0319f..7b59110 100644 --- a/package-lock.json +++ b/package-lock.json @@ -11,6 +11,7 @@ "dependencies": { "@graphql-tools/schema": "^10.0.2", "@graphql-tools/utils": "^10.0.13", + "cheerio": "^1.0.0-rc.12", "graphql": "^16.8.1" }, "devDependencies": { @@ -3194,6 +3195,11 @@ "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==", "dev": true }, + "node_modules/boolbase": { + "version": "1.0.0", + "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz", + "integrity": "sha512-JZOSA7Mo9sNGB8+UjSgzdLtokWAky1zbztM3WRLCbZ70/3cTANmQmOdR7y2g+J0e2WXywy1yS468tY+IruqEww==" + }, "node_modules/bottleneck": { "version": "2.19.5", "resolved": "https://registry.npmjs.org/bottleneck/-/bottleneck-2.19.5.tgz", @@ -3367,6 +3373,65 @@ "node": ">=10" } }, + "node_modules/cheerio": { + "version": "1.0.0-rc.12", + "resolved": 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"https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz", @@ -3899,6 +3964,32 @@ "url": "https://github.com/sponsors/sindresorhus" } }, + "node_modules/css-select": { + "version": "5.1.0", + "resolved": "https://registry.npmjs.org/css-select/-/css-select-5.1.0.tgz", + "integrity": "sha512-nwoRF1rvRRnnCqqY7updORDsuqKzqYJ28+oSMaJMMgOauh3fvwHqMS7EZpIPqK8GL+g9mKxF1vP/ZjSeNjEVHg==", + "dependencies": { + "boolbase": "^1.0.0", + "css-what": "^6.1.0", + "domhandler": "^5.0.2", + "domutils": "^3.0.1", + "nth-check": "^2.0.1" + }, + "funding": { + "url": "https://github.com/sponsors/fb55" + } + }, + "node_modules/css-what": { + "version": "6.1.0", + "resolved": "https://registry.npmjs.org/css-what/-/css-what-6.1.0.tgz", + "integrity": "sha512-HTUrgRJ7r4dsZKU6GjmpfRK1O76h97Z8MfS1G0FozR+oF2kG6Vfe8JE6zwrkbxigziPHinCJ+gCPjA9EaBDtRw==", + "engines": { + "node": ">= 6" + }, + "funding": { + "url": "https://github.com/sponsors/fb55" + } + }, "node_modules/debug": { "version": "4.3.4", "resolved": 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"https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz", @@ -15377,6 +15610,23 @@ } } }, + "css-select": { + "version": "5.1.0", + "resolved": "https://registry.npmjs.org/css-select/-/css-select-5.1.0.tgz", + "integrity": "sha512-nwoRF1rvRRnnCqqY7updORDsuqKzqYJ28+oSMaJMMgOauh3fvwHqMS7EZpIPqK8GL+g9mKxF1vP/ZjSeNjEVHg==", + "requires": { + "boolbase": "^1.0.0", + "css-what": "^6.1.0", + "domhandler": "^5.0.2", + "domutils": "^3.0.1", + "nth-check": "^2.0.1" + } + }, + "css-what": { + "version": "6.1.0", + "resolved": "https://registry.npmjs.org/css-what/-/css-what-6.1.0.tgz", + "integrity": "sha512-HTUrgRJ7r4dsZKU6GjmpfRK1O76h97Z8MfS1G0FozR+oF2kG6Vfe8JE6zwrkbxigziPHinCJ+gCPjA9EaBDtRw==" + }, "debug": { "version": "4.3.4", "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz", @@ -15482,6 +15732,39 @@ "esutils": "^2.0.2" } }, + "dom-serializer": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-2.0.0.tgz", + "integrity": 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"^10.0.13", + "cheerio": "^1.0.0-rc.12", "graphql": "^16.8.1" }, "devDependencies": { diff --git a/server/index.ts b/server/index.ts index c7f6c49..cbcb587 100644 --- a/server/index.ts +++ b/server/index.ts @@ -4,12 +4,14 @@ import { makeExecutableSchema } from '@graphql-tools/schema'; import encodingDirective from '@src/directives/encode'; import regexDirective from '@src/directives/regex'; import cacheDirective from '@src/directives/cache'; +import currencyDirective from '@src/directives/currency'; const typeDefs = String.raw`#graphql type User { firstName: String @regex(pattern: "(Eddie|Sam)") lastName: String @regex(pattern: "\\b[A-Z]\\w+\\b") age: Int @cache(key: "user_age", ttl: 3000) + amount: String @currency(from: "GBP", to: "USD") } type Query { @@ -23,6 +25,7 @@ const resolvers = { firstName: 'Eddie', lastName: 'Thuo', age: 28, + amount: '100', }) }, }; @@ -30,11 +33,13 @@ const resolvers = { const { encodingDirectiveTypeDefs, encodingDirectiveTransformer } = encodingDirective() const { regexDirectiveTypeDefs, regexDirectiveTransformer } = regexDirective() const { cacheDirectiveTypeDefs, cacheDirectiveTransformer } = cacheDirective() +const { currencyDirectiveTypeDefs, currencyDirectiveTransformer } = currencyDirective() const transformers = [ encodingDirectiveTransformer, regexDirectiveTransformer, cacheDirectiveTransformer, + currencyDirectiveTransformer, ] let schema = makeExecutableSchema(({ @@ -42,6 +47,7 @@ let schema = makeExecutableSchema(({ encodingDirectiveTypeDefs, regexDirectiveTypeDefs, cacheDirectiveTypeDefs, + currencyDirectiveTypeDefs, typeDefs ], resolvers diff --git a/src/directives/currency.ts b/src/directives/currency.ts new file mode 100644 index 0000000..325665a --- /dev/null +++ b/src/directives/currency.ts @@ -0,0 +1,42 @@ +import { fetchDirective } from '@src/utils' +import { MapperKind, mapSchema } from '@graphql-tools/utils' +import { GraphQLError, GraphQLSchema, defaultFieldResolver } from 'graphql' +import * as cheerio from 'cheerio' + +type CurrencyDirectiveArgs = { + from: string + to: string +} + +const currencyDirective = (directiveName: string = 'currency') => { + return { + currencyDirectiveTypeDefs: `directive @${directiveName}(from: String!, to: String!) on FIELD_DEFINITION`, + currencyDirectiveTransformer: (schema: GraphQLSchema) => mapSchema(schema, { + [MapperKind.OBJECT_FIELD]: (fieldConfig) => { + const currencyDirective = fetchDirective(schema, fieldConfig, directiveName) + if (currencyDirective) { + const { from, to } = currencyDirective + const { resolve = defaultFieldResolver } = fieldConfig + return { + ...fieldConfig, + resolve: async (source, args, context, info) => { + const value = await resolve(source, args, context, info) + try { + const response = await fetch(`https://www.google.com/search?q=${value}+${from}+to+${to}+&hl=en`) + const html = await response.text() + const $ = cheerio.load(html) + const $input = $('.iBp4i') // TODO: hacky... find better selector + return $input.text().split(' ')[0] + } catch (error) { + throw new GraphQLError(`Error converting amount ${value} from ${from} to ${to}!`, error) + } + } + } + + } + } + }) + } +} + +export default currencyDirective diff --git a/src/index.ts b/src/index.ts index 1bb7990..677650d 100644 --- a/src/index.ts +++ b/src/index.ts @@ -1,9 +1,11 @@ import cacheDirective from '@src/directives/cache' import encodingDirective from '@src/directives/encode' import regexDirective from '@src/directives/regex' +import currencyDirective from '@src/directives/currency' const directives = Object.freeze({ cacheDirective, + currencyDirective, encodingDirective, regexDirective, }) diff --git a/test/currency.test.ts b/test/currency.test.ts new file mode 100644 index 0000000..19698cd --- /dev/null +++ b/test/currency.test.ts @@ -0,0 +1,69 @@ +import { ApolloServer } from '@apollo/server' +import currencyDirective from '@src/directives/currency' +import { buildSchema } from './util' +import assert from 'assert' + +const { currencyDirectiveTypeDefs, currencyDirectiveTransformer } = currencyDirective() + +describe('@currency directive', () => { + const amount = 100 + let testServer: ApolloServer + + const resolvers = { + Query: { + user: () => ({ + amount + }) + } + } + + const testQuery = ` + query TestQuery { + user { + amount + } + } + ` + + afterEach(async () => { + if (testServer) { + await testServer.stop() + } + jest.restoreAllMocks() + }) + + it('will convert from one currency to another by fetching from URL', async () => { + const fetchSpy = jest.spyOn(global, 'fetch') + const from = 'GBP' + const to = 'USD' + const schema = buildSchema({ + typeDefs: [ + `type User { + amount: String @currency(from: "${from}", to: "${to}") + } + + type Query { + user: User + } + `, + currencyDirectiveTypeDefs + ], + resolvers, + transformers: [currencyDirectiveTransformer] + }) + + testServer = new ApolloServer({ schema }) + + const response = await testServer.executeOperation<{ user: { amount: string } }>({ + query: testQuery + }) + + assert(response.body.kind === 'single') + expect(response.body.singleResult.errors).toBeUndefined(); + expect(fetchSpy).toHaveBeenCalled() + expect(fetchSpy).toHaveBeenCalledWith(`https://www.google.com/search?q=${amount}+${from}+to+${to}+&hl=en`) + }) + it.todo('will convert from one currency to another and return a integer') + it.todo('will convert from one currency to another and format with a seperator') + it.todo('will throw an error if currency code is not recognized') +})