[d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var MissingRefError = require('./error_classes').MissingRef;
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| 4 |
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| 5 | module.exports = compileAsync;
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| 6 |
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| 7 |
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| 8 | /**
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| 9 | * Creates validating function for passed schema with asynchronous loading of missing schemas.
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| 10 | * `loadSchema` option should be a function that accepts schema uri and returns promise that resolves with the schema.
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| 11 | * @this Ajv
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| 12 | * @param {Object} schema schema object
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| 13 | * @param {Boolean} meta optional true to compile meta-schema; this parameter can be skipped
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| 14 | * @param {Function} callback an optional node-style callback, it is called with 2 parameters: error (or null) and validating function.
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| 15 | * @return {Promise} promise that resolves with a validating function.
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| 16 | */
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| 17 | function compileAsync(schema, meta, callback) {
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| 18 | /* eslint no-shadow: 0 */
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| 19 | /* global Promise */
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| 20 | /* jshint validthis: true */
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| 21 | var self = this;
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| 22 | if (typeof this._opts.loadSchema != 'function')
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| 23 | throw new Error('options.loadSchema should be a function');
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| 24 |
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| 25 | if (typeof meta == 'function') {
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| 26 | callback = meta;
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| 27 | meta = undefined;
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| 28 | }
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| 29 |
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| 30 | var p = loadMetaSchemaOf(schema).then(function () {
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| 31 | var schemaObj = self._addSchema(schema, undefined, meta);
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| 32 | return schemaObj.validate || _compileAsync(schemaObj);
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| 33 | });
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| 34 |
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| 35 | if (callback) {
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| 36 | p.then(
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| 37 | function(v) { callback(null, v); },
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| 38 | callback
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| 39 | );
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| 40 | }
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| 41 |
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| 42 | return p;
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| 43 |
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| 44 |
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| 45 | function loadMetaSchemaOf(sch) {
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| 46 | var $schema = sch.$schema;
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| 47 | return $schema && !self.getSchema($schema)
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| 48 | ? compileAsync.call(self, { $ref: $schema }, true)
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| 49 | : Promise.resolve();
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| 50 | }
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| 51 |
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| 52 |
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| 53 | function _compileAsync(schemaObj) {
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| 54 | try { return self._compile(schemaObj); }
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| 55 | catch(e) {
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| 56 | if (e instanceof MissingRefError) return loadMissingSchema(e);
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| 57 | throw e;
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| 58 | }
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| 59 |
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| 60 |
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| 61 | function loadMissingSchema(e) {
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| 62 | var ref = e.missingSchema;
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| 63 | if (added(ref)) throw new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved');
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| 64 |
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| 65 | var schemaPromise = self._loadingSchemas[ref];
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| 66 | if (!schemaPromise) {
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| 67 | schemaPromise = self._loadingSchemas[ref] = self._opts.loadSchema(ref);
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| 68 | schemaPromise.then(removePromise, removePromise);
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| 69 | }
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| 70 |
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| 71 | return schemaPromise.then(function (sch) {
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| 72 | if (!added(ref)) {
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| 73 | return loadMetaSchemaOf(sch).then(function () {
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| 74 | if (!added(ref)) self.addSchema(sch, ref, undefined, meta);
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| 75 | });
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| 76 | }
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| 77 | }).then(function() {
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| 78 | return _compileAsync(schemaObj);
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| 79 | });
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| 80 |
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| 81 | function removePromise() {
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| 82 | delete self._loadingSchemas[ref];
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| 83 | }
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| 84 |
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| 85 | function added(ref) {
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| 86 | return self._refs[ref] || self._schemas[ref];
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| 87 | }
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| 88 | }
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| 89 | }
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| 90 | }
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