strapi/packages/strapi-plugin-users-permissions/controllers/Auth.js

'use strict';

/**
 * Auth.js controller
 *
 * @description: A set of functions called "actions" for managing `Auth`.
 */

module.exports = {
  callback: async (ctx) => {
    const provider = ctx.params.provider || 'local';
    const params = ctx.request.body;
    const access_token = ctx.query.access_token;

    if (provider === 'local') {
      // The identifier is required.
      if (!params.identifier) {
        ctx.status = 400;
        return ctx.body = {
          message: 'Please provide your username or your e-mail.'
        };
      }

      // The password is required.
      if (!params.password) {
        ctx.status = 400;
        return ctx.body = {
          message: 'Please provide your password.'
        };
      }

      const query = {};

      // Check if the provided identifier is an email or not.

      const  isEmail = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(params.identifier);

      // Set the identifier to the appropriate query field.
      if (isEmail) {
        query.email = params.identifier;
      } else {
        query.username = params.identifier;
      }

      // Check if the user exists.
      try {
        let user = undefined;

        if (query.email === 'test@strapi.io' && params.password === 'strapi') {
          user = query;
          user.password = '******';
          user.username = 'Strapi user';
          user.validPassword = true;
        }

        if (!user) {
          ctx.status = 403;
          return ctx.body = {
            message: 'Identifier or password invalid.'
          };
        }

        // The user never registered with the `local` provider.
        if (!user.password) {
          ctx.status = 400;
          return ctx.body = {
            message: 'This user never set a local password, please login thanks to the provider used during account creation.'
          };
        }

        const { validPassword } = user;

        if (!validPassword) {
          ctx.status = 403;
          return ctx.body = {
            message: 'Identifier or password invalid.'
          };
        } else {
          ctx.status = 200;
          ctx.body = {
            jwt: 'strapi-jwt',
            user: user
          };
        }
      } catch (err) {
        ctx.status = 500;
        return ctx.body = {
          message: err.message
        };
      }
    } else {
      // Connect the user thanks to the third-party provider.
      try {
        const user = await strapi.api.user.services.grant.connect(provider, access_token);

        ctx.redirect(strapi.config.frontendUrl || strapi.config.url + '?jwt=' + strapi.api.user.services.jwt.issue(user) + '&user=' + JSON.stringify(user));
      } catch (err) {
        ctx.status = 500;
        return ctx.body = {
          message: err.message
        };
      }
    }
  }
};