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Providers

Certain plugins can be extended via the installation and configuration of additional providers.

Providers add an extension to the core capabilities of the plugin, for example to upload media files to AWS S3 instead of the local server, or using Amazon SES for emails instead of Sendmail.

✏️ Note

Only the Upload and Email plugins are currently designed to work with providers.

For the relevant plugins, there are both official providers maintained by Strapi — discoverable via the Marketplace — and many community maintained providers available via npm.

A provider can be configured to be private to ensure asset URLs will be signed for secure access.

Installing providers​

New providers can be installed using npm or yarn using the following format @strapi/provider-<plugin>-<provider> --save.

For example:

#Install the AWS S3 provider for the Upload plugin

yarn add @strapi/provider-upload-aws-s3

# Install the Sendgrid provider for the Email plugin
yarn add @strapi/provider-email-sendgrid --save

Configuring providers​

Newly installed providers are enabled and configured in the ./config/plugins.js file. If this file does not exist you must create it.

Each provider will have different configuration settings available. Review the respective entry for that provider in the Marketplace or npm to learn more.

Below are example configurations for the Upload and Email plugins.

./config/plugins.js

module.exports = ({ env }) => ({
  // ...
  upload: {
    config: {
      provider: 'aws-s3',
      providerOptions: {
        baseUrl: env('CDN_URL'),
        rootPath: env('CDN_ROOT_PATH'),
        s3Options: {
          credentials: {
            accessKeyId: env('AWS_ACCESS_KEY_ID'),
            secretAccessKey: env('AWS_ACCESS_SECRET'),
          },
          region: env('AWS_REGION'),
          params: {
            ACL: env('AWS_ACL', 'public-read'),
            signedUrlExpires: env('AWS_SIGNED_URL_EXPIRES', 15 * 60),
            Bucket: env('AWS_BUCKET'),
          },
        },
      },
      actionOptions: {
        upload: {},
        uploadStream: {},
        delete: {},
      },
    },
  },
  // ...
});
✏️ Note

Strapi has a default security middleware that has a very strict contentSecurityPolicy that limits loading images and media to "'self'" only, see the example configuration on the provider page or the middleware documentation for more information.

Configuration per environment​

When configuring your provider you might want to change the configuration based on the NODE_ENV environment variable or use environment specific credentials.

You can set a specific configuration in the ./config/env/{env}/plugins.js configuration file and it will be used to overwrite the default configuration.

Creating providers​

To implement your own custom provider you must create a Node.js module.

The interface that must be exported depends on the plugin you are developing the provider for. Below are templates for the Upload and Email plugins:

module.exports = {
  init(providerOptions) {
    // init your provider if necessary

    return {
      upload(file) {
        // upload the file in the provider
        // file content is accessible by `file.buffer`
      },
      uploadStream(file) {
        // upload the file in the provider
        // file content is accessible by `file.stream`
      },
      delete(file) {
        // delete the file in the provider
      },
      checkFileSize(file, { sizeLimit }) {
        // (optional)
        // implement your own file size limit logic
      },
      getSignedUrl(file) {
        // (optional)
        // Generate a signed URL for the given file.
        // The signed URL allows secure access to the file.
        // Only Content Manager assets will be signed.
        // Returns an object {url: string}.
      },
      isPrivate() {
        // (optional)
        // if it is private, file urls will be signed
        // Returns a boolean
      },
    };
  },
};

In the send function you will have access to:

  • providerOptions that contains configurations written in plugins.js
  • settings that contains configurations written in plugins.js
  • options that contains options you send when you call the send function from the email plugin service

You can review the Strapi maintained providers for example implementations.

After creating your new provider you can publish it to npm to share with the community or use it locally for your project only.

Local providers​

If you want to create your own provider without publishing it on npm you can follow these steps:

  1. Create a providers folder in your application.
  2. Create your provider (e.g. ./providers/strapi-provider-<plugin>-<provider>)
  3. Then update your package.json to link your strapi-provider-<plugin>-<provider> dependency to the local path of your new provider.
{
  ...
  "dependencies": {
    ...
    "strapi-provider-<plugin>-<provider>": "file:providers/strapi-provider-<plugin>-<provider>",
    ...
  }
}
  1. Update your ./config/plugins.js file to configure the provider.
  2. Finally, run yarn install or npm install to install your new custom provider.

Creating private providers​

You can set up a private provider, meaning that every asset URL displayed in the Content Manager will be signed for secure access.

To enable private providers, you must implement the isPrivate() method and return true.

In the backend, Strapi generates a signed URL for each asset using the getSignedUrl(file) method implemented in the provider. The signed URL includes an encrypted signature that allows the user to access the asset (but normally only for a limited time and with specific restrictions, depending on the provider).

Note that for security reasons, the content API will not provide any signed URLs. Instead, developers using the API should sign the urls themselves.

Example

To create a private aws-s3 provider:

  1. Create a ./providers/aws-s3 folder in your application. See Local Providers for more information.
  2. Implement the isPrivate() method in the aws-s3 provider to return true.
  3. Implement the getSignedUrl(file) method in the aws-s3 provider to generate a signed URL for the given file.
./providers/aws-s3/index.js
// aws-s3 provider

module.exports = {
  init: (config) => {
    const s3 = new AWS.S3(config);

    return {
      async upload(file) {
        // code to upload file to S3
      },

      async delete(file) {
        // code to delete file from S3
      },

      async isPrivate() {
        return true;
      },

      async getSignedUrl(file) {
        const params = {
          Bucket: config.params.Bucket,
          Key: file.path,
          Expires: 60, // URL expiration time in seconds
        };

        const signedUrl = await s3.getSignedUrlPromise("getObject", params);
        return { url: signedUrl };
      },
    };
  },
};