271 lines
7.7 KiB
JavaScript
271 lines
7.7 KiB
JavaScript
'use strict';
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var URI = require('uri-js')
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, equal = require('fast-deep-equal')
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, util = require('./util')
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, SchemaObject = require('./schema_obj')
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, traverse = require('json-schema-traverse');
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module.exports = resolve;
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resolve.normalizeId = normalizeId;
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resolve.fullPath = getFullPath;
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resolve.url = resolveUrl;
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resolve.ids = resolveIds;
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resolve.inlineRef = inlineRef;
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resolve.schema = resolveSchema;
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/**
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* [resolve and compile the references ($ref)]
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* @this Ajv
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* @param {Function} compile reference to schema compilation funciton (localCompile)
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* @param {Object} root object with information about the root schema for the current schema
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* @param {String} ref reference to resolve
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* @return {Object|Function} schema object (if the schema can be inlined) or validation function
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*/
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function resolve(compile, root, ref) {
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/* jshint validthis: true */
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var refVal = this._refs[ref];
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if (typeof refVal == 'string') {
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if (this._refs[refVal]) refVal = this._refs[refVal];
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else return resolve.call(this, compile, root, refVal);
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}
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refVal = refVal || this._schemas[ref];
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if (refVal instanceof SchemaObject) {
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return inlineRef(refVal.schema, this._opts.inlineRefs)
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? refVal.schema
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: refVal.validate || this._compile(refVal);
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}
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var res = resolveSchema.call(this, root, ref);
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var schema, v, baseId;
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if (res) {
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schema = res.schema;
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root = res.root;
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baseId = res.baseId;
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}
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if (schema instanceof SchemaObject) {
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v = schema.validate || compile.call(this, schema.schema, root, undefined, baseId);
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} else if (schema !== undefined) {
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v = inlineRef(schema, this._opts.inlineRefs)
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? schema
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: compile.call(this, schema, root, undefined, baseId);
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}
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return v;
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}
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/**
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* Resolve schema, its root and baseId
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* @this Ajv
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* @param {Object} root root object with properties schema, refVal, refs
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* @param {String} ref reference to resolve
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* @return {Object} object with properties schema, root, baseId
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*/
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function resolveSchema(root, ref) {
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/* jshint validthis: true */
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var p = URI.parse(ref)
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, refPath = _getFullPath(p)
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, baseId = getFullPath(this._getId(root.schema));
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if (Object.keys(root.schema).length === 0 || refPath !== baseId) {
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var id = normalizeId(refPath);
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var refVal = this._refs[id];
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if (typeof refVal == 'string') {
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return resolveRecursive.call(this, root, refVal, p);
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} else if (refVal instanceof SchemaObject) {
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if (!refVal.validate) this._compile(refVal);
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root = refVal;
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} else {
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refVal = this._schemas[id];
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if (refVal instanceof SchemaObject) {
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if (!refVal.validate) this._compile(refVal);
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if (id == normalizeId(ref))
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return { schema: refVal, root: root, baseId: baseId };
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root = refVal;
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} else {
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return;
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}
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}
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if (!root.schema) return;
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baseId = getFullPath(this._getId(root.schema));
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}
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return getJsonPointer.call(this, p, baseId, root.schema, root);
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}
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/* @this Ajv */
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function resolveRecursive(root, ref, parsedRef) {
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/* jshint validthis: true */
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var res = resolveSchema.call(this, root, ref);
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if (res) {
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var schema = res.schema;
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var baseId = res.baseId;
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root = res.root;
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var id = this._getId(schema);
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if (id) baseId = resolveUrl(baseId, id);
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return getJsonPointer.call(this, parsedRef, baseId, schema, root);
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}
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}
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var PREVENT_SCOPE_CHANGE = util.toHash(['properties', 'patternProperties', 'enum', 'dependencies', 'definitions']);
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/* @this Ajv */
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function getJsonPointer(parsedRef, baseId, schema, root) {
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/* jshint validthis: true */
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parsedRef.fragment = parsedRef.fragment || '';
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if (parsedRef.fragment.slice(0,1) != '/') return;
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var parts = parsedRef.fragment.split('/');
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for (var i = 1; i < parts.length; i++) {
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var part = parts[i];
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if (part) {
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part = util.unescapeFragment(part);
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schema = schema[part];
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if (schema === undefined) break;
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var id;
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if (!PREVENT_SCOPE_CHANGE[part]) {
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id = this._getId(schema);
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if (id) baseId = resolveUrl(baseId, id);
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if (schema.$ref) {
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var $ref = resolveUrl(baseId, schema.$ref);
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var res = resolveSchema.call(this, root, $ref);
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if (res) {
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schema = res.schema;
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root = res.root;
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baseId = res.baseId;
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}
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}
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}
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}
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}
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if (schema !== undefined && schema !== root.schema)
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return { schema: schema, root: root, baseId: baseId };
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}
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var SIMPLE_INLINED = util.toHash([
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'type', 'format', 'pattern',
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'maxLength', 'minLength',
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'maxProperties', 'minProperties',
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'maxItems', 'minItems',
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'maximum', 'minimum',
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'uniqueItems', 'multipleOf',
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'required', 'enum'
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]);
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function inlineRef(schema, limit) {
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if (limit === false) return false;
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if (limit === undefined || limit === true) return checkNoRef(schema);
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else if (limit) return countKeys(schema) <= limit;
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}
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function checkNoRef(schema) {
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var item;
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if (Array.isArray(schema)) {
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for (var i=0; i<schema.length; i++) {
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item = schema[i];
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if (typeof item == 'object' && !checkNoRef(item)) return false;
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}
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} else {
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for (var key in schema) {
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if (key == '$ref') return false;
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item = schema[key];
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if (typeof item == 'object' && !checkNoRef(item)) return false;
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}
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}
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return true;
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}
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function countKeys(schema) {
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var count = 0, item;
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if (Array.isArray(schema)) {
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for (var i=0; i<schema.length; i++) {
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item = schema[i];
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if (typeof item == 'object') count += countKeys(item);
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if (count == Infinity) return Infinity;
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}
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} else {
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for (var key in schema) {
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if (key == '$ref') return Infinity;
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if (SIMPLE_INLINED[key]) {
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count++;
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} else {
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item = schema[key];
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if (typeof item == 'object') count += countKeys(item) + 1;
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if (count == Infinity) return Infinity;
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}
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}
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}
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return count;
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}
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function getFullPath(id, normalize) {
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if (normalize !== false) id = normalizeId(id);
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var p = URI.parse(id);
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return _getFullPath(p);
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}
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function _getFullPath(p) {
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return URI.serialize(p).split('#')[0] + '#';
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}
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var TRAILING_SLASH_HASH = /#\/?$/;
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function normalizeId(id) {
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return id ? id.replace(TRAILING_SLASH_HASH, '') : '';
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}
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function resolveUrl(baseId, id) {
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id = normalizeId(id);
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return URI.resolve(baseId, id);
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}
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/* @this Ajv */
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function resolveIds(schema) {
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var schemaId = normalizeId(this._getId(schema));
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var baseIds = {'': schemaId};
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var fullPaths = {'': getFullPath(schemaId, false)};
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var localRefs = {};
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var self = this;
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traverse(schema, {allKeys: true}, function(sch, jsonPtr, rootSchema, parentJsonPtr, parentKeyword, parentSchema, keyIndex) {
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if (jsonPtr === '') return;
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var id = self._getId(sch);
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var baseId = baseIds[parentJsonPtr];
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var fullPath = fullPaths[parentJsonPtr] + '/' + parentKeyword;
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if (keyIndex !== undefined)
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fullPath += '/' + (typeof keyIndex == 'number' ? keyIndex : util.escapeFragment(keyIndex));
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if (typeof id == 'string') {
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id = baseId = normalizeId(baseId ? URI.resolve(baseId, id) : id);
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var refVal = self._refs[id];
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if (typeof refVal == 'string') refVal = self._refs[refVal];
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if (refVal && refVal.schema) {
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if (!equal(sch, refVal.schema))
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throw new Error('id "' + id + '" resolves to more than one schema');
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} else if (id != normalizeId(fullPath)) {
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if (id[0] == '#') {
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if (localRefs[id] && !equal(sch, localRefs[id]))
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throw new Error('id "' + id + '" resolves to more than one schema');
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localRefs[id] = sch;
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} else {
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self._refs[id] = fullPath;
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}
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}
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}
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baseIds[jsonPtr] = baseId;
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fullPaths[jsonPtr] = fullPath;
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});
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return localRefs;
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}
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