unleash-server
Version:
Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.
41 lines • 2.02 kB
JavaScript
const compileRegex = (pattern) => new RegExp(`^${pattern}$`);
const disallowedStrings = [' ', '\\t', '\\s', '\\n', '\\r', '\\f', '\\v'];
// Helper functions for error messages
const whitespaceError = (pattern) => `Feature flag names cannot contain whitespace. You've provided a feature flag naming pattern that contains a whitespace character: "${pattern}". Remove any whitespace characters from your pattern.`;
const exampleMismatchError = (example, pattern) => `You've provided a feature flag naming example ("${example}") that doesn't match your feature flag naming pattern ("${pattern}").`;
const invalidValueError = (valueName) => `You've provided a feature flag naming ${valueName}, but no feature flag naming pattern. You must specify a pattern to use a ${valueName}.`;
export const checkFeatureNamingData = (featureNaming) => {
const { pattern, example, description } = featureNaming;
const errors = [];
if (disallowedStrings.some((str) => pattern?.includes(str))) {
errors.push(whitespaceError(pattern));
}
else if (pattern && example && !compileRegex(pattern).test(example)) {
errors.push(exampleMismatchError(example, pattern));
}
if (!pattern && example) {
errors.push(invalidValueError('example'));
}
if (!pattern && description) {
errors.push(invalidValueError('description'));
}
const [first, ...rest] = errors;
if (first) {
return { state: 'invalid', reasons: [first, ...rest] };
}
return { state: 'valid' };
};
export const checkFeatureFlagNamesAgainstPattern = (featureNames, pattern) => {
if (pattern) {
const regex = compileRegex(pattern);
const mismatchedNames = featureNames.filter((name) => !regex.test(name));
if (mismatchedNames.length > 0) {
return {
state: 'invalid',
invalidNames: new Set(mismatchedNames),
};
}
}
return { state: 'valid' };
};
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