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When an ACL formula fails to be run, a warning is printed. However, it is painful to know which formula is concerned by the warning. ACL: if RHS is null, return false for "in" and "not in"
109 lines
4.7 KiB
TypeScript
109 lines
4.7 KiB
TypeScript
/**
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* Representation and compilation of ACL formulas.
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*
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* An example of an ACL formula is: "rec.office == 'Seattle' and user.email in ['sally@', 'xie@']".
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* These formulas are parsed in Python into a tree with nodes of the form [NODE_TYPE, ...args].
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* See sandbox/grist/acl_formula.py for details.
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*
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* This modules includes typings for the nodes, and compileAclFormula() function that turns such a
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* tree into an actual boolean function.
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*/
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import {CellValue} from 'app/common/DocActions';
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import {ErrorWithCode} from 'app/common/ErrorWithCode';
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import {AclMatchFunc, AclMatchInput, ParsedAclFormula} from 'app/common/GranularAccessClause';
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import constant = require('lodash/constant');
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const GRIST_CONSTANTS: Record<string, string> = {
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EDITOR: 'editors',
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OWNER: 'owners',
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VIEWER: 'viewers',
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};
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/**
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* Compile a parsed ACL formula into an actual function that can evaluate a request.
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*/
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export function compileAclFormula(parsedAclFormula: ParsedAclFormula): AclMatchFunc {
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const compiled = _compileNode(parsedAclFormula);
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return (input) => Boolean(compiled(input));
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}
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/**
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* Type for intermediate functions, which may return values other than booleans.
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*/
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type AclEvalFunc = (input: AclMatchInput) => any;
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/**
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* Compile a single node of the parsed formula tree.
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*/
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function _compileNode(parsedAclFormula: ParsedAclFormula): AclEvalFunc {
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const rawArgs = parsedAclFormula.slice(1);
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const args = rawArgs as ParsedAclFormula[];
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switch (parsedAclFormula[0]) {
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case 'And': { const parts = args.map(_compileNode); return (input) => parts.every(p => p(input)); }
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case 'Or': { const parts = args.map(_compileNode); return (input) => parts.some(p => p(input)); }
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case 'Add': return _compileAndCombine(args, ([a, b]) => a + b);
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case 'Sub': return _compileAndCombine(args, ([a, b]) => a - b);
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case 'Mult': return _compileAndCombine(args, ([a, b]) => a * b);
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case 'Div': return _compileAndCombine(args, ([a, b]) => a / b);
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case 'Mod': return _compileAndCombine(args, ([a, b]) => a % b);
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case 'Not': return _compileAndCombine(args, ([a]) => !a);
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case 'Eq': return _compileAndCombine(args, ([a, b]) => a === b);
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case 'NotEq': return _compileAndCombine(args, ([a, b]) => a !== b);
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case 'Lt': return _compileAndCombine(args, ([a, b]) => a < b);
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case 'LtE': return _compileAndCombine(args, ([a, b]) => a <= b);
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case 'Gt': return _compileAndCombine(args, ([a, b]) => a > b);
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case 'GtE': return _compileAndCombine(args, ([a, b]) => a >= b);
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case 'Is': return _compileAndCombine(args, ([a, b]) => a === b);
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case 'IsNot': return _compileAndCombine(args, ([a, b]) => a !== b);
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case 'In': return _compileAndCombine(args, ([a, b]) => Boolean(b?.includes(a)));
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case 'NotIn': return _compileAndCombine(args, ([a, b]) => !b?.includes(a));
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case 'List': return _compileAndCombine(args, (values) => values);
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case 'Const': return constant(parsedAclFormula[1] as CellValue);
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case 'Name': {
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const name = rawArgs[0] as keyof AclMatchInput;
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if (GRIST_CONSTANTS[name]) { return constant(GRIST_CONSTANTS[name]); }
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if (!['user', 'rec', 'newRec'].includes(name)) {
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throw new Error(`Unknown variable '${name}'`);
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}
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return (input) => input[name];
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}
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case 'Attr': {
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const attrName = rawArgs[1] as string;
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return _compileAndCombine([args[0]], ([value]) => getAttr(value, attrName, args[0]));
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}
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case 'Comment': return _compileNode(args[0]);
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}
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throw new Error(`Unknown node type '${parsedAclFormula[0]}'`);
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}
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function describeNode(node: ParsedAclFormula): string {
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if (node[0] === 'Name') {
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return node[1] as string;
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} else if (node[0] === 'Attr') {
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return describeNode(node[1] as ParsedAclFormula) + '.' + (node[2] as string);
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} else {
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return 'value';
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}
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}
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function getAttr(value: any, attrName: string, valueNode: ParsedAclFormula): any {
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if (value == null) {
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if (valueNode[0] === 'Name' && (valueNode[1] === 'rec' || valueNode[1] === 'newRec')) {
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// This code is recognized by GranularAccess to know when a rule is row-specific.
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throw new ErrorWithCode('NEED_ROW_DATA', `Missing row data '${valueNode[1]}'`);
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}
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throw new Error(`No value for '${describeNode(valueNode)}'`);
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}
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return (typeof value.get === 'function' ? value.get(attrName) : // InfoView
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value[attrName]);
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}
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/**
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* Helper for operators: compile a list of nodes, then when evaluating, evaluate them all and
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* combine the array of results using the given combine() function.
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*/
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function _compileAndCombine(args: ParsedAclFormula[], combine: (values: any[]) => any): AclEvalFunc {
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const compiled = args.map(_compileNode);
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return (input: AclMatchInput) => combine(compiled.map(c => c(input)));
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}
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