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Viewing file:     index.js (5.38 KB)      -rw-r--r--

'use strict';

/**
 * Module dependencies
 */

// Public node modules.
const _ = require('lodash');
const { ApolloServer } = require('apollo-server-koa');
const depthLimit = require('graphql-depth-limit');
const { graphqlUploadKoa } = require('graphql-upload');
const loadConfigs = require('./load-config');

const attachMetadataToResolvers = (schema, { api, plugin }) => {
  const { resolver = {} } = schema;
  if (_.isEmpty(resolver)) return schema;

  Object.keys(resolver).forEach(type => {
    if (!_.isPlainObject(resolver[type])) return;

    Object.keys(resolver[type]).forEach(resolverName => {
      if (!_.isPlainObject(resolver[type][resolverName])) return;

      resolver[type][resolverName]['_metadatas'] = {
        api,
        plugin,
      };
    });
  });

  return schema;
};

module.exports = strapi => {
  const { appPath, installedPlugins } = strapi.config;

  return {
    async beforeInitialize() {
      // Try to inject this hook just after the others hooks to skip the router processing.
      if (!strapi.config.get('hook.load.after')) {
        _.set(strapi.config.hook.load, 'after', []);
      }

      strapi.config.hook.load.after.push('graphql');
      // Load core utils.

      const { api, plugins, extensions } = await loadConfigs({
        appPath,
        installedPlugins,
      });
      _.merge(strapi, { api, plugins });

      // Create a merge of all the GraphQL configuration.
      const apisSchemas = Object.keys(strapi.api || {}).map(key => {
        const schema = _.get(strapi.api[key], 'config.schema.graphql', {});
        return attachMetadataToResolvers(schema, { api: key });
      });

      const pluginsSchemas = Object.keys(strapi.plugins || {}).map(key => {
        const schema = _.get(strapi.plugins[key], 'config.schema.graphql', {});
        return attachMetadataToResolvers(schema, { plugin: key });
      });

      const extensionsSchemas = Object.keys(extensions || {}).map(key => {
        const schema = _.get(extensions[key], 'config.schema.graphql', {});
        return attachMetadataToResolvers(schema, { plugin: key });
      });

      const baseSchema = mergeSchemas([...pluginsSchemas, ...extensionsSchemas, ...apisSchemas]);

      // save the final schema in the plugin's config
      _.set(strapi.plugins.graphql, 'config._schema.graphql', baseSchema);
    },

    initialize() {
      const schema = strapi.plugins.graphql.services['schema-generator'].generateSchema();

      if (_.isEmpty(schema)) {
        strapi.log.warn('The GraphQL schema has not been generated because it is empty');

        return;
      }

      const config = _.get(strapi.plugins.graphql, 'config', {});

      // TODO: Remove these deprecated options in favor of `apolloServer` in the next major version
      const deprecatedApolloServerConfig = {
        tracing: _.get(config, 'tracing', false),
        introspection: _.get(config, 'introspection', true),
        engine: _.get(config, 'engine', false),
      };

      if (['tracing', 'introspection', 'engine'].some(key => _.has(config, key))) {
        strapi.log.warn(
          'The `tracing`, `introspection` and `engine` options are deprecated in favor of the `apolloServer` object and they will be removed in the next major version.'
        );
      }

      const apolloServerConfig = _.get(config, 'apolloServer', {});

      const serverParams = {
        schema,
        uploads: false,
        context: ({ ctx }) => {
          // Initiliase loaders for this request.
          // TODO: set loaders in the context not globally

          strapi.plugins.graphql.services['data-loaders'].initializeLoader();

          return {
            context: ctx,
          };
        },
        formatError: err => {
          const formatError = _.get(config, 'formatError', null);

          return typeof formatError === 'function' ? formatError(err) : err;
        },
        validationRules: [depthLimit(config.depthLimit)],
        playground: false,
        cors: false,
        bodyParserConfig: true,
        // TODO: Remove these deprecated options in favor of `apolloServerConfig` in the next major version
        ...deprecatedApolloServerConfig,
        ...apolloServerConfig,
      };

      // Disable GraphQL Playground in production environment.
      if (strapi.config.environment !== 'production' || config.playgroundAlways) {
        serverParams.playground = {
          endpoint: `${strapi.config.server.url}${config.endpoint}`,
          shareEnabled: config.shareEnabled,
        };
      }

      const server = new ApolloServer(serverParams);

      const uploadMiddleware = graphqlUploadKoa();
      strapi.app.use((ctx, next) => {
        if (ctx.path === config.endpoint) {
          return uploadMiddleware(ctx, next);
        }

        return next();
      });
      server.applyMiddleware({
        app: strapi.app,
        path: config.endpoint,
      });

      strapi.plugins.graphql.destroy = async () => {
        await server.stop();
      };
    },
  };
};

/**
 * Merges a  list of schemas
 * @param {Array<Object>} schemas - The list of schemas to merge
 */
const mergeSchemas = schemas => {
  return schemas.reduce((acc, el) => {
    const { definition, query, mutation, type, resolver } = el;

    return _.merge(acc, {
      definition: `${acc.definition || ''} ${definition || ''}`,
      query: `${acc.query || ''} ${query || ''}`,
      mutation: `${acc.mutation || ''} ${mutation || ''}`,
      type,
      resolver,
    });
  }, {});
};