unleash-server/dist/lib/services/client-spec-service.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import semver from 'semver';
import BadDataError from '../error/bad-data-error.js';
import { mustParseStrictSemVer, parseStrictSemVer } from '../util/semver.js';
export class ClientSpecService {
    constructor(config) {
        this.clientSpecHeader = 'Unleash-Client-Spec';
        this.clientSpecFeatures = {
            segments: mustParseStrictSemVer('4.2.0'),
            deltaApi: mustParseStrictSemVer('5.2.0'),
        };
        this.logger = config.getLogger('services/capability-service.ts');
    }
    requestSupportsSpec(request, feature) {
        return this.versionSupportsSpec(feature, request.header(this.clientSpecHeader));
    }
    versionSupportsSpec(feature, version) {
        if (!version) {
            return false;
        }
        const parsedVersion = parseStrictSemVer(version);
        if (!parsedVersion && !/^\d/.test(version)) {
            throw new BadDataError(`Invalid prefix in the ${this.clientSpecHeader} header: "${version}".`);
        }
        if (!parsedVersion) {
            throw new BadDataError(`Invalid SemVer in the ${this.clientSpecHeader} header: "${version}".`);
        }
        return semver.gte(parsedVersion, this.clientSpecFeatures[feature]);
    }
}
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