feat: add OAuth2 authentication (Google/GitHub/Discord)

src/services/users/oauth2/google/signin/get.ts

@@ -0,0 +1,42 @@
+import { Static, Type } from '@sinclair/typebox'
+import { FastifyPluginAsync, FastifySchema } from 'fastify'
+
+import { HOST, PORT } from '../../../../../tools/configurations/index.js'
+import { fastifyErrors } from '../../../../../models/utils.js'
+import { GOOGLE_BASE_URL, GOOGLE_CLIENT_ID } from '../__utils__/utils.js'
+
+const querySchema = Type.Object({
+  redirectURI: Type.String({ format: 'uri-reference' })
+})
+
+type QuerySchemaType = Static<typeof querySchema>
+
+const getServiceSchema: FastifySchema = {
+  description: 'Google OAuth2 - signin',
+  tags: ['users'] as string[],
+  querystring: querySchema,
+  response: {
+    200: Type.String(),
+    400: fastifyErrors[400],
+    500: fastifyErrors[500]
+  }
+} as const
+
+export const getSigninGoogleOAuth2Service: FastifyPluginAsync = async (
+  fastify
+) => {
+  await fastify.route<{
+    Querystring: QuerySchemaType
+  }>({
+    method: 'GET',
+    url: '/users/oauth2/google/signin',
+    schema: getServiceSchema,
+    handler: async (request, reply) => {
+      const { redirectURI } = request.query
+      const redirectCallback = `${request.protocol}://${HOST}:${PORT}/users/oauth2/google/callback?redirectURI=${redirectURI}`
+      const url = `${GOOGLE_BASE_URL}?client_id=${GOOGLE_CLIENT_ID}&redirect_uri=${redirectCallback}&response_type=code&scope=profile&access_type=online`
+      reply.statusCode = 200
+      return url
+    }
+  })
+}