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/*! firebase-admin v13.5.0 */
/*!
* Copyright 2024 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
exports.ConditionEvaluator = void 0;
const remote_config_api_1 = require("./remote-config-api");
const crypto_1 = require("crypto");
/**
* Encapsulates condition evaluation logic to simplify organization and
* facilitate testing.
*
* @internal
*/
class ConditionEvaluator {
evaluateConditions(namedConditions, context) {
// The order of the conditions is significant.
// A JS Map preserves the order of insertion ("Iteration happens in insertion order"
// - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#description).
const evaluatedConditions = new Map();
for (const namedCondition of namedConditions) {
evaluatedConditions.set(namedCondition.name, this.evaluateCondition(namedCondition.condition, context));
}
return evaluatedConditions;
}
evaluateCondition(condition, context, nestingLevel = 0) {
if (nestingLevel >= ConditionEvaluator.MAX_CONDITION_RECURSION_DEPTH) {
// TODO: add logging once we have a wrapped logger.
return false;
}
if (condition.orCondition) {
return this.evaluateOrCondition(condition.orCondition, context, nestingLevel + 1);
}
if (condition.andCondition) {
return this.evaluateAndCondition(condition.andCondition, context, nestingLevel + 1);
}
if (condition.true) {
return true;
}
if (condition.false) {
return false;
}
if (condition.percent) {
return this.evaluatePercentCondition(condition.percent, context);
}
if (condition.customSignal) {
return this.evaluateCustomSignalCondition(condition.customSignal, context);
}
// TODO: add logging once we have a wrapped logger.
return false;
}
evaluateOrCondition(orCondition, context, nestingLevel) {
const subConditions = orCondition.conditions || [];
for (const subCondition of subConditions) {
// Recursive call.
const result = this.evaluateCondition(subCondition, context, nestingLevel + 1);
// Short-circuit the evaluation result for true.
if (result) {
return result;
}
}
return false;
}
evaluateAndCondition(andCondition, context, nestingLevel) {
const subConditions = andCondition.conditions || [];
for (const subCondition of subConditions) {
// Recursive call.
const result = this.evaluateCondition(subCondition, context, nestingLevel + 1);
// Short-circuit the evaluation result for false.
if (!result) {
return result;
}
}
return true;
}
evaluatePercentCondition(percentCondition, context) {
if (!context.randomizationId) {
// TODO: add logging once we have a wrapped logger.
return false;
}
// This is the entry point for processing percent condition data from the response.
// We're not using a proto library, so we can't assume undefined fields have
// default values.
const { seed, percentOperator, microPercent, microPercentRange } = percentCondition;
if (!percentOperator) {
// TODO: add logging once we have a wrapped logger.
return false;
}
const normalizedMicroPercent = microPercent || 0;
const normalizedMicroPercentUpperBound = microPercentRange?.microPercentUpperBound || 0;
const normalizedMicroPercentLowerBound = microPercentRange?.microPercentLowerBound || 0;
const seedPrefix = seed && seed.length > 0 ? `${seed}.` : '';
const stringToHash = `${seedPrefix}${context.randomizationId}`;
const hash = ConditionEvaluator.hashSeededRandomizationId(stringToHash);
const instanceMicroPercentile = hash % BigInt(100 * 1000000);
switch (percentOperator) {
case remote_config_api_1.PercentConditionOperator.LESS_OR_EQUAL:
return instanceMicroPercentile <= normalizedMicroPercent;
case remote_config_api_1.PercentConditionOperator.GREATER_THAN:
return instanceMicroPercentile > normalizedMicroPercent;
case remote_config_api_1.PercentConditionOperator.BETWEEN:
return instanceMicroPercentile > normalizedMicroPercentLowerBound
&& instanceMicroPercentile <= normalizedMicroPercentUpperBound;
case remote_config_api_1.PercentConditionOperator.UNKNOWN:
default:
break;
}
// TODO: add logging once we have a wrapped logger.
return false;
}
static hashSeededRandomizationId(seededRandomizationId) {
const hex = (0, crypto_1.createHash)('sha256').update(seededRandomizationId).digest('hex');
return BigInt(`0x${hex}`);
}
evaluateCustomSignalCondition(customSignalCondition, context) {
const { customSignalOperator, customSignalKey, targetCustomSignalValues, } = customSignalCondition;
if (!customSignalOperator || !customSignalKey || !targetCustomSignalValues) {
// TODO: add logging once we have a wrapped logger.
return false;
}
if (!targetCustomSignalValues.length) {
return false;
}
// Extract the value of the signal from the evaluation context.
const actualCustomSignalValue = context[customSignalKey];
if (actualCustomSignalValue == undefined) {
return false;
}
switch (customSignalOperator) {
case remote_config_api_1.CustomSignalOperator.STRING_CONTAINS:
return compareStrings(targetCustomSignalValues, actualCustomSignalValue, (target, actual) => actual.includes(target));
case remote_config_api_1.CustomSignalOperator.STRING_DOES_NOT_CONTAIN:
return !compareStrings(targetCustomSignalValues, actualCustomSignalValue, (target, actual) => actual.includes(target));
case remote_config_api_1.CustomSignalOperator.STRING_EXACTLY_MATCHES:
return compareStrings(targetCustomSignalValues, actualCustomSignalValue, (target, actual) => actual.trim() === target.trim());
case remote_config_api_1.CustomSignalOperator.STRING_CONTAINS_REGEX:
return compareStrings(targetCustomSignalValues, actualCustomSignalValue, (target, actual) => new RegExp(target).test(actual));
// For numeric operators only one target value is allowed.
case remote_config_api_1.CustomSignalOperator.NUMERIC_LESS_THAN:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r < 0);
case remote_config_api_1.CustomSignalOperator.NUMERIC_LESS_EQUAL:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r <= 0);
case remote_config_api_1.CustomSignalOperator.NUMERIC_EQUAL:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r === 0);
case remote_config_api_1.CustomSignalOperator.NUMERIC_NOT_EQUAL:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r !== 0);
case remote_config_api_1.CustomSignalOperator.NUMERIC_GREATER_THAN:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r > 0);
case remote_config_api_1.CustomSignalOperator.NUMERIC_GREATER_EQUAL:
return compareNumbers(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r >= 0);
// For semantic operators only one target value is allowed.
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_LESS_THAN:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r < 0);
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_LESS_EQUAL:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r <= 0);
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_EQUAL:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r === 0);
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_NOT_EQUAL:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r !== 0);
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_GREATER_THAN:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r > 0);
case remote_config_api_1.CustomSignalOperator.SEMANTIC_VERSION_GREATER_EQUAL:
return compareSemanticVersions(actualCustomSignalValue, targetCustomSignalValues[0], (r) => r >= 0);
}
// TODO: add logging once we have a wrapped logger.
return false;
}
}
exports.ConditionEvaluator = ConditionEvaluator;
ConditionEvaluator.MAX_CONDITION_RECURSION_DEPTH = 10;
// Compares the actual string value of a signal against a list of target
// values. If any of the target values are a match, returns true.
function compareStrings(targetValues, actualValue, predicateFn) {
const actual = String(actualValue);
return targetValues.some((target) => predicateFn(target, actual));
}
// Compares two numbers against each other.
// Calls the predicate function with -1, 0, 1 if actual is less than, equal to, or greater than target.
function compareNumbers(actualValue, targetValue, predicateFn) {
const target = Number(targetValue);
const actual = Number(actualValue);
if (isNaN(target) || isNaN(actual)) {
return false;
}
return predicateFn(actual < target ? -1 : actual > target ? 1 : 0);
}
// Max number of segments a numeric version can have. This is enforced by the server as well.
const MAX_LENGTH = 5;
// Compares semantic version strings against each other.
// Calls the predicate function with -1, 0, 1 if actual is less than, equal to, or greater than target.
function compareSemanticVersions(actualValue, targetValue, predicateFn) {
const version1 = String(actualValue).split('.').map(Number);
const version2 = targetValue.split('.').map(Number);
if (version1.length > MAX_LENGTH || version2.length > MAX_LENGTH) {
return false;
}
for (let i = 0; i < MAX_LENGTH; i++) {
// Check to see if segments are present. Note that these may be present and be NaN.
const version1HasSegment = version1[i] !== undefined;
const version2HasSegment = version2[i] !== undefined;
// Insert zeros if undefined for easier comparison.
if (!version1HasSegment)
version1[i] = 0;
if (!version2HasSegment)
version2[i] = 0;
// At this point, if either segment is NaN, we return false directly.
if (isNaN(version1[i]) || isNaN(version2[i]))
return false;
// Check if we have a difference in segments. Otherwise continue to next segment.
if (version1[i] < version2[i])
return predicateFn(-1);
if (version1[i] > version2[i])
return predicateFn(1);
}
// If this point is reached, the semantic versions are equal.
return predicateFn(0);
}