@jahed/firebase-rules/lib/dataSnapshot.js

A type-safe Firebase Real-time Database Security Rules builder.

import { createRuleObject } from "./object.js";
import { allOf } from "./operator.js";
import { createRuleBoolean, createRuleNumber } from "./primitive.js";
import { toJSONString } from "./serialise.js";
import { createRuleString } from "./string.js";
/**
 * Creates a representation of a Firebase RuleDataSnapshots for use in rules.
 *
 * Note that `val()` is not type-specific so it's not available. Use `isString`,
 * `isNumber`, etc. to apply rules to `val()`.
 *
 * `data.isString(val => lessThan(val.length, 100))` is the same as
 * `data.isString() && data.val().length < 100`.
 *
 * https://firebase.google.com/docs/reference/security/database#ruledatasnapshot_methods
 */
export const createRuleDataSnapshot = (name) => {
    return createRuleObject(name, {
        isString: (valRule) => {
            const baseRule = createRuleBoolean(`${name}.isString()`);
            return valRule
                ? allOf(baseRule, valRule(createRuleString(`${name}.val()`)))
                : baseRule;
        },
        isBoolean: (valRule) => {
            const baseRule = createRuleBoolean(`${name}.isBoolean()`);
            return valRule
                ? allOf(baseRule, valRule(createRuleBoolean(`${name}.val()`)))
                : baseRule;
        },
        isNumber: (valRule) => {
            const baseRule = createRuleBoolean(`${name}.isNumber()`);
            return valRule
                ? allOf(baseRule, valRule(createRuleNumber(`${name}.val()`)))
                : baseRule;
        },
        exists: () => {
            return createRuleBoolean(`${name}.exists()`);
        },
        hasChildren: (keys) => {
            return createRuleBoolean(`${name}.hasChildren(${toJSONString(keys)})`);
        },
        child: (...parts) => {
            const key = parts.map((part) => toJSONString(part)).join(" + ");
            return createRuleDataSnapshot(`${name}.child(${key})`);
        },
    });
};
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