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Viewing file:     condition-evaluator-internal.js (11.92 KB)      -rw-r--r--

/*! 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);
}