firebase-bolt
Version:
Firebase Bolt Security and Modeling Language Compiler
626 lines (625 loc) • 70.5 kB
JavaScript
"use strict";
exports.__esModule = true;
/*
* AST builders for Firebase Rules Language.
*
* Copyright 2015 Google Inc. All Rights Reserved.
*
* 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.
*/
var util = require("./util");
var logger = require("./logger");
var errors = {
typeMismatch: "Unexpected type: ",
duplicatePathPart: "A path component name is duplicated: "
};
;
;
var PathPart = /** @class */ (function () {
// "label", undefined - static path part
// "$label", X - variable path part
// X, !undefined - variable path part
function PathPart(label, variable) {
if (label[0] === '$' && variable === undefined) {
variable = label;
}
if (variable && label[0] !== '$') {
label = '$' + label;
}
this.label = label;
this.variable = variable;
}
return PathPart;
}());
exports.PathPart = PathPart;
var PathTemplate = /** @class */ (function () {
function PathTemplate(parts) {
if (parts === void 0) { parts = []; }
this.parts = parts.map(function (part) {
if (util.isType(part, 'string')) {
return new PathPart(part);
}
else {
return part;
}
});
}
PathTemplate.prototype.copy = function () {
var result = new PathTemplate();
result.push(this);
return result;
};
PathTemplate.prototype.getLabels = function () {
return this.parts.map(function (part) { return part.label; });
};
// Mapping from variables to JSON labels
PathTemplate.prototype.getScope = function () {
var result = {};
this.parts.forEach(function (part) {
if (part.variable) {
if (result[part.variable]) {
throw new Error(errors.duplicatePathPart + part.variable);
}
result[part.variable] = literal(part.label);
}
});
return result;
};
PathTemplate.prototype.push = function (temp) {
util.extendArray(this.parts, temp.parts);
};
PathTemplate.prototype.pop = function (temp) {
var _this = this;
temp.parts.forEach(function (part) {
_this.parts.pop();
});
};
PathTemplate.prototype.length = function () {
return this.parts.length;
};
PathTemplate.prototype.getPart = function (i) {
if (i > this.parts.length || i < -this.parts.length) {
var l = this.parts.length;
throw new Error("Path reference out of bounds: " + i +
" [" + -l + " .. " + l + "]");
}
if (i < 0) {
return this.parts[this.parts.length + i];
}
return this.parts[i];
};
return PathTemplate;
}());
exports.PathTemplate = PathTemplate;
;
var Schema = /** @class */ (function () {
function Schema() {
}
Schema.isGeneric = function (schema) {
return schema.params !== undefined && schema.params.length > 0;
};
return Schema;
}());
exports.Schema = Schema;
;
exports.string = valueGen('String');
exports.boolean = valueGen('Boolean');
exports.number = valueGen('Number');
exports.array = valueGen('Array');
exports.neg = opGen('neg', 1);
exports.not = opGen('!', 1);
exports.mult = opGen('*');
exports.div = opGen('/');
exports.mod = opGen('%');
exports.add = opGen('+');
exports.sub = opGen('-');
exports.eq = opGen('==');
exports.lt = opGen('<');
exports.lte = opGen('<=');
exports.gt = opGen('>');
exports.gte = opGen('>=');
exports.ne = opGen('!=');
exports.and = opGen('&&');
exports.or = opGen('||');
exports.ternary = opGen('?:', 3);
exports.value = opGen('value', 1);
function variable(name) {
return { type: 'var', valueType: 'Any', name: name };
}
exports.variable = variable;
function literal(name) {
return { type: 'literal', valueType: 'Any', name: name };
}
exports.literal = literal;
function nullType() {
return { type: 'Null', valueType: 'Null' };
}
exports.nullType = nullType;
function reference(base, prop) {
return {
type: 'ref',
valueType: 'Any',
base: base,
accessor: prop
};
}
exports.reference = reference;
var reIdentifier = /^[a-zA-Z_$][a-zA-Z0-9_]*$/;
function isIdentifierStringExp(exp) {
return exp.type === 'String' && reIdentifier.test(exp.value);
}
exports.isIdentifierStringExp = isIdentifierStringExp;
// Shallow copy of an expression (so it can be modified and preserve
// immutability of the original expression).
function copyExp(exp) {
exp = util.extend({}, exp);
switch (exp.type) {
case 'op':
case 'call':
var opExp = exp;
opExp.args = util.copyArray(opExp.args);
return opExp;
case 'union':
var unionExp = exp;
unionExp.types = util.copyArray(unionExp.types);
return unionExp;
case 'generic':
var genericExp = exp;
genericExp.params = util.copyArray(genericExp.params);
return genericExp;
default:
return exp;
}
}
exports.copyExp = copyExp;
// Make a (shallow) copy of the base expression, setting (or removing) it's
// valueType.
//
// valueType is a string indicating the type of evaluating an expression (e.g.
// 'Snapshot') - used to know when type coercion is needed in the context
// of parent expressions.
function cast(base, valueType) {
var result = copyExp(base);
result.valueType = valueType;
return result;
}
exports.cast = cast;
function call(ref, args) {
if (args === void 0) { args = []; }
return { type: 'call', valueType: 'Any', ref: ref, args: args };
}
exports.call = call;
// Return empty string if not a function.
function getFunctionName(exp) {
if (exp.ref.type === 'ref') {
return '';
}
return exp.ref.name;
}
exports.getFunctionName = getFunctionName;
// Return empty string if not a (simple) method call -- ref.fn()
function getMethodName(exp) {
if (exp.ref.type === 'var') {
return exp.ref.name;
}
if (exp.ref.type !== 'ref') {
return '';
}
return getPropName(exp.ref);
}
exports.getMethodName = getMethodName;
function getPropName(ref) {
if (ref.accessor.type !== 'String') {
return '';
}
return ref.accessor.value;
}
exports.getPropName = getPropName;
// TODO: Type of function signature does not fail this declaration?
function builtin(fn) {
return { type: 'builtin', valueType: 'Any', fn: fn };
}
exports.builtin = builtin;
function snapshotVariable(name) {
return cast(variable(name), 'Snapshot');
}
exports.snapshotVariable = snapshotVariable;
function snapshotParent(base) {
if (base.valueType !== 'Snapshot') {
throw new Error(errors.typeMismatch + "expected Snapshot");
}
return cast(call(reference(cast(base, 'Any'), exports.string('parent'))), 'Snapshot');
}
exports.snapshotParent = snapshotParent;
function ensureValue(exp) {
if (exp.valueType === 'Snapshot') {
return snapshotValue(exp);
}
return exp;
}
exports.ensureValue = ensureValue;
// ref.val()
function snapshotValue(exp) {
return call(reference(cast(exp, 'Any'), exports.string('val')));
}
exports.snapshotValue = snapshotValue;
// Ensure expression is a boolean (when used in a boolean context).
function ensureBoolean(exp) {
exp = ensureValue(exp);
if (isCall(exp, 'val')) {
exp = exports.eq(exp, exports.boolean(true));
}
return exp;
}
exports.ensureBoolean = ensureBoolean;
function isCall(exp, methodName) {
return exp.type === 'call' && exp.ref.type === 'ref' &&
exp.ref.accessor.type === 'String' &&
exp.ref.accessor.value === methodName;
}
exports.isCall = isCall;
// Return value generating function for a given Type.
function valueGen(typeName) {
return function (val) {
return {
type: typeName,
valueType: typeName,
value: val // The (constant) value itself.
};
};
}
function regexp(pattern, modifiers) {
if (modifiers === void 0) { modifiers = ""; }
switch (modifiers) {
case "":
case "i":
break;
default:
throw new Error("Unsupported RegExp modifier: " + modifiers);
}
return {
type: 'RegExp',
valueType: 'RegExp',
value: pattern,
modifiers: modifiers
};
}
exports.regexp = regexp;
function cmpValues(v1, v2) {
if (v1.type !== v2.type) {
return false;
}
return v1.value === v2.value;
}
function isOp(opType, exp) {
return exp.type === 'op' && exp.op === opType;
}
// Return a generating function to make an operator exp node.
function opGen(opType, arity) {
if (arity === void 0) { arity = 2; }
return function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
if (args.length !== arity) {
throw new Error("Operator has " + args.length +
" arguments (expecting " + arity + ").");
}
return op(opType, args);
};
}
exports.andArray = leftAssociateGen('&&', exports.boolean(true), exports.boolean(false));
exports.orArray = leftAssociateGen('||', exports.boolean(false), exports.boolean(true));
// Create an expression builder function which operates on arrays of values.
// Returns new expression like v1 op v2 op v3 ...
//
// - Any identityValue's in array input are ignored.
// - If zeroValue is found - just return zeroValue.
//
// Our function re-orders top-level op in array elements to the resulting
// expression is left-associating. E.g.:
//
// [a && b, c && d] => (((a && b) && c) && d)
// (NOT (a && b) && (c && d))
function leftAssociateGen(opType, identityValue, zeroValue) {
return function (a) {
var i;
function reducer(result, current) {
if (result === undefined) {
return current;
}
return op(opType, [result, current]);
}
// First flatten all top-level op values to one flat array.
var flat = [];
for (i = 0; i < a.length; i++) {
flatten(opType, a[i], flat);
}
var result = [];
for (i = 0; i < flat.length; i++) {
// Remove identifyValues from array.
if (cmpValues(flat[i], identityValue)) {
continue;
}
// Just return zeroValue if found
if (cmpValues(flat[i], zeroValue)) {
return zeroValue;
}
result.push(flat[i]);
}
if (result.length === 0) {
return identityValue;
}
// Return left-associative expression of opType.
return result.reduce(reducer);
};
}
// Flatten the top level tree of op into a single flat array of expressions.
function flatten(opType, exp, flat) {
var i;
if (flat === undefined) {
flat = [];
}
if (!isOp(opType, exp)) {
flat.push(exp);
return flat;
}
for (i = 0; i < exp.args.length; i++) {
flatten(opType, exp.args[i], flat);
}
return flat;
}
exports.flatten = flatten;
function op(opType, args) {
return {
type: 'op',
valueType: 'Any',
op: opType,
args: args // Arguments to the operator Array<exp>
};
}
exports.op = op;
// Warning: NOT an expression type!
function method(params, body) {
return {
params: params,
body: body
};
}
exports.method = method;
function typeType(typeName) {
return { type: "type", valueType: "type", name: typeName };
}
exports.typeType = typeType;
function unionType(types) {
return { type: "union", valueType: "type", types: types };
}
exports.unionType = unionType;
function genericType(typeName, params) {
return { type: "generic", valueType: "type", name: typeName, params: params };
}
exports.genericType = genericType;
var Symbols = /** @class */ (function () {
function Symbols() {
this.functions = {};
this.paths = [];
this.schema = {};
}
Symbols.prototype.register = function (map, typeName, name, object) {
if (map[name]) {
logger.error("Duplicated " + typeName + " definition: " + name + ".");
}
else {
map[name] = object;
}
return map[name];
};
Symbols.prototype.registerFunction = function (name, params, body) {
return this.register(this.functions, 'functions', name, method(params, body));
};
Symbols.prototype.registerPath = function (template, isType, methods) {
if (methods === void 0) { methods = {}; }
isType = isType || typeType('Any');
var p = {
template: template.copy(),
isType: isType,
methods: methods
};
this.paths.push(p);
return p;
};
Symbols.prototype.registerSchema = function (name, derivedFrom, properties, methods, params) {
if (properties === void 0) { properties = {}; }
if (methods === void 0) { methods = {}; }
if (params === void 0) { params = []; }
derivedFrom = derivedFrom || typeType(Object.keys(properties).length > 0 ? 'Object' : 'Any');
var s = {
derivedFrom: derivedFrom,
properties: properties,
methods: methods,
params: params
};
return this.register(this.schema, 'schema', name, s);
};
Symbols.prototype.isDerivedFrom = function (type, ancestor) {
var _this = this;
if (ancestor === 'Any') {
return true;
}
switch (type.type) {
case 'type':
case 'generic':
var simpleType = type;
if (simpleType.name === ancestor) {
return true;
}
if (simpleType.name === 'Any') {
return false;
}
var schema = this.schema[simpleType.name];
if (!schema) {
return false;
}
return this.isDerivedFrom(schema.derivedFrom, ancestor);
case 'union':
return type.types
.map(function (subType) { return _this.isDerivedFrom(subType, ancestor); })
.reduce(util.or);
default:
throw new Error("Unknown type: " + type.type);
}
};
return Symbols;
}());
exports.Symbols = Symbols;
var JS_OPS = {
'value': { rep: "", p: 18 },
'neg': { rep: "-", p: 15 },
'!': { p: 15 },
'*': { p: 14 },
'/': { p: 14 },
'%': { p: 14 },
'+': { p: 13 },
'-': { p: 13 },
'<': { p: 11 },
'<=': { p: 11 },
'>': { p: 11 },
'>=': { p: 11 },
'in': { p: 11 },
'==': { p: 10 },
"!=": { p: 10 },
'&&': { p: 6 },
'||': { p: 5 },
'?:': { p: 4 },
',': { p: 0 }
};
// From an AST, decode as an expression (string).
function decodeExpression(exp, outerPrecedence) {
if (outerPrecedence === undefined) {
outerPrecedence = 0;
}
var innerPrecedence = precedenceOf(exp);
var result = '';
switch (exp.type) {
case 'Boolean':
case 'Number':
result = JSON.stringify(exp.value);
break;
case 'String':
result = util.quoteString(exp.value);
break;
// RegExp assumed to be in pre-quoted format.
case 'RegExp':
var regexp_1 = exp;
result = '/' + regexp_1.value + '/';
if (regexp_1.modifiers !== '') {
result += regexp_1.modifiers;
}
break;
case 'Array':
result = '[' + decodeArray(exp.value) + ']';
break;
case 'Null':
result = 'null';
break;
case 'var':
case 'literal':
result = exp.name;
break;
case 'ref':
var expRef = exp;
if (isIdentifierStringExp(expRef.accessor)) {
result = decodeExpression(expRef.base, innerPrecedence) + '.' + expRef.accessor.value;
}
else {
result = decodeExpression(expRef.base, innerPrecedence) +
'[' + decodeExpression(expRef.accessor) + ']';
}
break;
case 'call':
var expCall = exp;
result = decodeExpression(expCall.ref) + '(' + decodeArray(expCall.args) + ')';
break;
case 'builtin':
result = decodeExpression(exp);
break;
case 'op':
var expOp = exp;
var rep = JS_OPS[expOp.op].rep === undefined ? expOp.op : JS_OPS[expOp.op].rep;
if (expOp.args.length === 1) {
result = rep + decodeExpression(expOp.args[0], innerPrecedence);
}
else if (expOp.args.length === 2) {
result =
decodeExpression(expOp.args[0], innerPrecedence) +
' ' + rep + ' ' +
// All ops are left associative - so nudge the innerPrecendence
// down on the right hand side to force () for right-associating
// operations.
decodeExpression(expOp.args[1], innerPrecedence + 1);
if ((innerPrecedence >= outerPrecedence) && ((expOp.op === '&&') || (expOp.op === '||'))) {
result = '(' + result + ')';
}
}
else if (expOp.args.length === 3) {
result =
decodeExpression(expOp.args[0], innerPrecedence) + ' ? ' +
decodeExpression(expOp.args[1], innerPrecedence) + ' : ' +
decodeExpression(expOp.args[2], innerPrecedence);
}
break;
case 'type':
result = exp.name;
break;
case 'union':
result = exp.types.map(decodeExpression).join(' | ');
break;
case 'generic':
var genericType_1 = exp;
return genericType_1.name + '<' + decodeArray(genericType_1.params) + '>';
default:
result = "***UNKNOWN TYPE*** (" + exp.type + ")";
break;
}
if (innerPrecedence < outerPrecedence) {
result = '(' + result + ')';
}
return result;
}
exports.decodeExpression = decodeExpression;
function decodeArray(args) {
return args.map(decodeExpression).join(', ');
}
function precedenceOf(exp) {
var result;
switch (exp.type) {
case 'op':
result = JS_OPS[exp.op].p;
break;
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
// lists call as 17 and ref as 18 - but how could they be anything other than left to right?
// http://www.scriptingmaster.com/javascript/operator-precedence.asp - agrees.
case 'call':
result = 18;
break;
case 'ref':
result = 18;
break;
default:
result = 19;
break;
}
return result;
}
//# 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* AST builders for Firebase Rules Language.\n *\n * Copyright 2015 Google Inc. All Rights Reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport * as util from './util';\nimport * as logger from './logger';\n\nvar errors = {\n  typeMismatch: \"Unexpected type: \",\n  duplicatePathPart: \"A path component name is duplicated: \",\n};\n\nexport type Object = { [prop: string]: any };\n\nexport interface Exp {\n  type: string;\n  valueType: string;\n}\n\nexport interface ExpValue extends Exp {\n  value: any;\n}\n\nexport interface RegExpValue extends ExpValue {\n  modifiers: string;\n}\n\nexport interface ExpNull extends Exp {\n}\n\nexport interface ExpOp extends Exp {\n  op: string;\n  args: Exp[];\n}\n\nexport interface ExpVariable extends Exp {\n  name: string;\n}\n\nexport interface ExpLiteral extends Exp {\n  name: string;\n}\n\n// base[accessor]\nexport interface ExpReference extends Exp {\n  base: Exp;\n  accessor: Exp;\n}\n\nexport interface ExpCall extends Exp {\n  ref: ExpReference | ExpVariable;\n  args: Exp[];\n}\n\nexport interface Params { [name: string]: Exp; };\n\nexport type BuiltinFunction = (args: Exp[], params: Params) => Exp;\n\nexport interface ExpBuiltin extends Exp {\n  fn: BuiltinFunction;\n}\n\nexport type ExpType = ExpSimpleType | ExpUnionType | ExpGenericType;\nexport interface TypeParams { [name: string]: ExpType; };\n\n// Simple Type (reference)\nexport interface ExpSimpleType extends Exp {\n  name: string;\n}\n\n// Union Type: Type1 | Type2 | ...\nexport interface ExpUnionType extends Exp {\n  types: ExpType[];\n}\n\n// Generic Type (reference): Type<Type1, Type2, ...>\nexport interface ExpGenericType extends Exp {\n  name: string;\n  params: ExpType[];\n}\n\nexport interface Method {\n  params: string[];\n  body: Exp;\n}\n\nexport class PathPart {\n  label: string;\n  variable: string;\n\n  // \"label\", undefined - static path part\n  // \"$label\", X - variable path part\n  // X, !undefined - variable path part\n  constructor(label: string, variable?: string) {\n    if (label[0] === '$' && variable === undefined) {\n      variable = label;\n    }\n    if (variable && label[0] !== '$') {\n      label = '$' + label;\n    }\n    this.label = label;\n    this.variable = <string> variable;\n  }\n}\n\nexport class PathTemplate {\n  parts: PathPart[];\n\n  constructor(parts = <(string | PathPart)[]> []) {\n    this.parts = <PathPart[]> parts.map((part) => {\n      if (util.isType(part, 'string')) {\n        return new PathPart(<string> part);\n      } else {\n        return <PathPart> part;\n      }\n    });\n  }\n\n  copy() {\n    let result = new PathTemplate();\n    result.push(this);\n    return result;\n  }\n\n  getLabels(): string[] {\n    return this.parts.map((part) => part.label);\n  }\n\n  // Mapping from variables to JSON labels\n  getScope(): Params {\n    let result = <Params> {};\n    this.parts.forEach((part) => {\n      if (part.variable) {\n        if (result[part.variable]) {\n          throw new Error(errors.duplicatePathPart + part.variable);\n        }\n        result[part.variable] = literal(part.label);\n      }\n    });\n    return result;\n  }\n\n  push(temp: PathTemplate) {\n    util.extendArray(this.parts, temp.parts);\n  }\n\n  pop(temp: PathTemplate) {\n    temp.parts.forEach((part) => {\n      this.parts.pop();\n    });\n  }\n\n  length(): number {\n    return this.parts.length;\n  }\n\n  getPart(i: number): PathPart {\n    if (i > this.parts.length || i < -this.parts.length) {\n      let l = this.parts.length;\n      throw new Error(\"Path reference out of bounds: \" + i +\n                      \" [\" + -l + \" .. \" + l + \"]\");\n    }\n    if (i < 0) {\n      return this.parts[this.parts.length + i];\n    }\n    return this.parts[i];\n  }\n}\n\nexport interface Path {\n  template: PathTemplate;\n  isType: ExpType;\n  methods: { [name: string]: Method };\n};\n\nexport class Schema {\n  derivedFrom: ExpType;\n  properties: TypeParams;\n  methods: { [name: string]: Method };\n\n  // Generic parameters - if a Generic schema\n  params?: string[];\n  getValidator?: (params: Exp[]) => Object;\n\n  static isGeneric(schema: Schema): boolean {\n    return schema.params !== undefined && schema.params.length > 0;\n  }\n};\n\nexport var string: (v: string) => ExpValue = valueGen('String');\nexport var boolean: (v: boolean) => ExpValue = valueGen('Boolean');\nexport var number: (v: number) => ExpValue = valueGen('Number');\nexport var array: (v: Array<any>) => ExpValue = valueGen('Array');\n\nexport var neg = opGen('neg', 1);\nexport var not = opGen('!', 1);\nexport var mult = opGen('*');\nexport var div = opGen('/');\nexport var mod = opGen('%');\nexport var add = opGen('+');\nexport var sub = opGen('-');\nexport var eq = opGen('==');\nexport var lt = opGen('<');\nexport var lte = opGen('<=');\nexport var g