Server-Side OFREP Provider

This provider is designed to use the OpenFeature Remote Evaluation Protocol (OFREP).

Installation

$3

``sh
npm install @openfeature/ofrep-provider
`

$3

`sh
yarn add @openfeature/ofrep-provider @openfeature/ofrep-core @openfeature/server-sdk
`

> [!NOTE]
> yarn requires manual installation of peer dependencies

Configurations and Usage

The provider needs the base url of the OFREP server for instantiation.

`ts
import { OFREPProvider } from '@openfeature/ofrep-provider';

OpenFeature.setProvider(new OFREPProvider({ baseUrl: 'https://localhost:8080' }));
`

$3

The provider can use headers from either a static header map or a custom header factory.

#### Static Headers

Headers can be given as a list of tuples or as a map of headers.

`ts
import { OFREPProvider } from '@openfeature/ofrep-provider';

OpenFeature.setProvider(
new OFREPProvider({
baseUrl: 'https://localhost:8080',
headers: [
['Authorization', my-api-key],
['X-My-Header', CustomHeaderValue],
],
}),
);
`

`ts
import { OFREPProvider } from '@openfeature/ofrep-provider';

OpenFeature.setProvider(
new OFREPProvider({
baseUrl: 'https://localhost:8080',
headers: { Authorization: my-api-key, 'X-My-Header': CustomHeaderValue },
}),
);
`

#### Header Factory

The header factory is evaluated before every flag evaluation which makes it possible to use dynamic values for the headers.

The following shows an example of loading a token and using it as bearer token.

`ts
import { OFREPProvider } from '@openfeature/ofrep-provider';

OpenFeature.setProvider(
new OFREPProvider({
baseUrl: 'https://localhost:8080',
headersFactory: () => {
const token: string = loadDynamicToken();
return [['Authorization', Bearer ${token}]];
},
}),
);
`

$3

If needed, a custom fetch implementation can be injected, if e.g. the platform does not have fetch built in.

`ts
import { OFREPProvider } from '@openfeature/ofrep-provider';
import { fetchPolyfill } from 'some-fetch-polyfill';

OpenFeature.setProvider(
new OFREPProvider({
baseUrl: 'https://localhost:8080',
fetchImplementation: fetchPolyfill,
}),
);
`

Building

Run nx package providers-ofrep to build the library.

Running unit tests

Run nx test providers-ofrep` to execute the unit tests via Jest.