737 lines
21 KiB
JavaScript
737 lines
21 KiB
JavaScript
var mongodb = require('mongodb');
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var Parse = require('parse/node').Parse;
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// TODO: Turn this into a helper library for the database adapter.
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// Transforms a key-value pair from REST API form to Mongo form.
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// This is the main entry point for converting anything from REST form
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// to Mongo form; no conversion should happen that doesn't pass
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// through this function.
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// Schema should already be loaded.
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//
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// There are several options that can help transform:
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//
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// query: true indicates that query constraints like $lt are allowed in
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// the value.
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//
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// update: true indicates that __op operators like Add and Delete
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// in the value are converted to a mongo update form. Otherwise they are
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// converted to static data.
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//
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// validate: true indicates that key names are to be validated.
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//
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// Returns an object with {key: key, value: value}.
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function transformKeyValue(schema, className, restKey, restValue, options) {
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options = options || {};
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// Check if the schema is known since it's a built-in field.
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var key = restKey;
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var timeField = false;
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switch(key) {
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case 'objectId':
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case '_id':
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key = '_id';
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break;
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case 'createdAt':
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case '_created_at':
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key = '_created_at';
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timeField = true;
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break;
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case 'updatedAt':
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case '_updated_at':
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key = '_updated_at';
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timeField = true;
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break;
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case 'sessionToken':
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case '_session_token':
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key = '_session_token';
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break;
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case 'expiresAt':
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case '_expiresAt':
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key = 'expiresAt';
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timeField = true;
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break;
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case '_rperm':
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case '_wperm':
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return {key: key, value: restValue};
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break;
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case 'authData.anonymous.id':
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if (options.query) {
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return {key: '_auth_data_anonymous.id', value: restValue};
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}
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throw new Parse.Error(Parse.Error.INVALID_KEY_NAME,
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'can only query on ' + key);
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break;
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case 'authData.facebook.id':
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if (options.query) {
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// Special-case auth data.
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return {key: '_auth_data_facebook.id', value: restValue};
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}
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throw new Parse.Error(Parse.Error.INVALID_KEY_NAME,
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'can only query on ' + key);
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break;
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case '$or':
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if (!options.query) {
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throw new Parse.Error(Parse.Error.INVALID_KEY_NAME,
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'you can only use $or in queries');
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}
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if (!(restValue instanceof Array)) {
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throw new Parse.Error(Parse.Error.INVALID_QUERY,
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'bad $or format - use an array value');
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}
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var mongoSubqueries = restValue.map((s) => {
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return transformWhere(schema, className, s);
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});
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return {key: '$or', value: mongoSubqueries};
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case '$and':
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if (!options.query) {
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throw new Parse.Error(Parse.Error.INVALID_KEY_NAME,
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'you can only use $and in queries');
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}
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if (!(restValue instanceof Array)) {
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throw new Parse.Error(Parse.Error.INVALID_QUERY,
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'bad $and format - use an array value');
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}
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var mongoSubqueries = restValue.map((s) => {
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return transformWhere(schema, className, s);
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});
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return {key: '$and', value: mongoSubqueries};
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default:
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if (options.validate && !key.match(/^[a-zA-Z][a-zA-Z0-9_\.]*$/)) {
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throw new Parse.Error(Parse.Error.INVALID_KEY_NAME,
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'invalid key name: ' + key);
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}
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}
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// Handle special schema key changes
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// TODO: it seems like this is likely to have edge cases where
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// pointer types are missed
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var expected = undefined;
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if (schema && schema.getExpectedType) {
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expected = schema.getExpectedType(className, key);
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}
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if ((expected && expected[0] == '*') ||
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(!expected && restValue && restValue.__type == 'Pointer')) {
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key = '_p_' + key;
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}
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var inArray = (expected === 'array');
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// Handle query constraints
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if (options.query) {
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value = transformConstraint(restValue, inArray);
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if (value !== CannotTransform) {
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return {key: key, value: value};
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}
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}
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if (inArray && options.query && !(restValue instanceof Array)) {
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return {
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key: key, value: [restValue]
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};
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}
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// Handle atomic values
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var value = transformAtom(restValue, false, options);
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if (value !== CannotTransform) {
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if (timeField && (typeof value === 'string')) {
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value = new Date(value);
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}
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return {key: key, value: value};
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}
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// ACLs are handled before this method is called
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// If an ACL key still exists here, something is wrong.
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if (key === 'ACL') {
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throw 'There was a problem transforming an ACL.';
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}
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// Handle arrays
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if (restValue instanceof Array) {
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if (options.query) {
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throw new Parse.Error(Parse.Error.INVALID_JSON,
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'cannot use array as query param');
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}
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value = restValue.map((restObj) => {
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var out = transformKeyValue(schema, className, restKey, restObj, { inArray: true });
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return out.value;
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});
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return {key: key, value: value};
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}
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// Handle update operators
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value = transformUpdateOperator(restValue, !options.update);
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if (value !== CannotTransform) {
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return {key: key, value: value};
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}
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// Handle normal objects by recursing
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value = {};
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for (var subRestKey in restValue) {
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var subRestValue = restValue[subRestKey];
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var out = transformKeyValue(schema, className, subRestKey, subRestValue, { inObject: true });
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// For recursed objects, keep the keys in rest format
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value[subRestKey] = out.value;
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}
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return {key: key, value: value};
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}
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// Main exposed method to help run queries.
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// restWhere is the "where" clause in REST API form.
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// Returns the mongo form of the query.
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// Throws a Parse.Error if the input query is invalid.
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function transformWhere(schema, className, restWhere) {
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var mongoWhere = {};
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if (restWhere['ACL']) {
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throw new Parse.Error(Parse.Error.INVALID_QUERY,
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'Cannot query on ACL.');
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}
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for (var restKey in restWhere) {
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var out = transformKeyValue(schema, className, restKey, restWhere[restKey],
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{query: true, validate: true});
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mongoWhere[out.key] = out.value;
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}
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return mongoWhere;
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}
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// Main exposed method to create new objects.
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// restCreate is the "create" clause in REST API form.
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// Returns the mongo form of the object.
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function transformCreate(schema, className, restCreate) {
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var mongoCreate = transformACL(restCreate);
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for (var restKey in restCreate) {
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var out = transformKeyValue(schema, className, restKey, restCreate[restKey]);
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if (out.value !== undefined) {
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mongoCreate[out.key] = out.value;
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}
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}
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return mongoCreate;
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}
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// Main exposed method to help update old objects.
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function transformUpdate(schema, className, restUpdate) {
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if (!restUpdate) {
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throw 'got empty restUpdate';
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}
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var mongoUpdate = {};
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var acl = transformACL(restUpdate);
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if (acl._rperm || acl._wperm) {
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mongoUpdate['$set'] = {};
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if (acl._rperm) {
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mongoUpdate['$set']['_rperm'] = acl._rperm;
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}
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if (acl._wperm) {
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mongoUpdate['$set']['_wperm'] = acl._wperm;
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}
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}
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for (var restKey in restUpdate) {
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var out = transformKeyValue(schema, className, restKey, restUpdate[restKey],
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{update: true});
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// If the output value is an object with any $ keys, it's an
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// operator that needs to be lifted onto the top level update
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// object.
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if (typeof out.value === 'object' && out.value !== null &&
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out.value.__op) {
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mongoUpdate[out.value.__op] = mongoUpdate[out.value.__op] || {};
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mongoUpdate[out.value.__op][out.key] = out.value.arg;
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} else {
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mongoUpdate['$set'] = mongoUpdate['$set'] || {};
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mongoUpdate['$set'][out.key] = out.value;
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}
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}
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return mongoUpdate;
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}
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// Transforms a REST API formatted ACL object to our two-field mongo format.
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// This mutates the restObject passed in to remove the ACL key.
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function transformACL(restObject) {
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var output = {};
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if (!restObject['ACL']) {
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return output;
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}
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var acl = restObject['ACL'];
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var rperm = [];
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var wperm = [];
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for (var entry in acl) {
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if (acl[entry].read) {
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rperm.push(entry);
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}
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if (acl[entry].write) {
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wperm.push(entry);
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}
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}
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if (rperm.length) {
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output._rperm = rperm;
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}
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if (wperm.length) {
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output._wperm = wperm;
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}
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delete restObject.ACL;
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return output;
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}
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// Transforms a mongo format ACL to a REST API format ACL key
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// This mutates the mongoObject passed in to remove the _rperm/_wperm keys
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function untransformACL(mongoObject) {
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var output = {};
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if (!mongoObject['_rperm'] && !mongoObject['_wperm']) {
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return output;
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}
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var acl = {};
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var rperm = mongoObject['_rperm'] || [];
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var wperm = mongoObject['_wperm'] || [];
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rperm.map((entry) => {
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if (!acl[entry]) {
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acl[entry] = {read: true};
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} else {
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acl[entry]['read'] = true;
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}
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});
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wperm.map((entry) => {
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if (!acl[entry]) {
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acl[entry] = {write: true};
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} else {
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acl[entry]['write'] = true;
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}
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});
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output['ACL'] = acl;
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delete mongoObject._rperm;
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delete mongoObject._wperm;
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return output;
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}
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// Transforms a key used in the REST API format to its mongo format.
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function transformKey(schema, className, key) {
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return transformKeyValue(schema, className, key, null, {validate: true}).key;
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}
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// A sentinel value that helper transformations return when they
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// cannot perform a transformation
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function CannotTransform() {}
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// Helper function to transform an atom from REST format to Mongo format.
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// An atom is anything that can't contain other expressions. So it
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// includes things where objects are used to represent other
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// datatypes, like pointers and dates, but it does not include objects
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// or arrays with generic stuff inside.
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// If options.inArray is true, we'll leave it in REST format.
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// If options.inObject is true, we'll leave files in REST format.
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// Raises an error if this cannot possibly be valid REST format.
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// Returns CannotTransform if it's just not an atom, or if force is
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// true, throws an error.
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function transformAtom(atom, force, options) {
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options = options || {};
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var inArray = options.inArray;
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var inObject = options.inObject;
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switch(typeof atom) {
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case 'string':
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case 'number':
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case 'boolean':
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return atom;
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case 'undefined':
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return atom;
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case 'symbol':
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case 'function':
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throw new Parse.Error(Parse.Error.INVALID_JSON,
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'cannot transform value: ' + atom);
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case 'object':
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if (atom instanceof Date) {
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// Technically dates are not rest format, but, it seems pretty
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// clear what they should be transformed to, so let's just do it.
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return atom;
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}
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if (atom === null) {
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return atom;
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}
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// TODO: check validity harder for the __type-defined types
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if (atom.__type == 'Pointer') {
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if (!inArray && !inObject) {
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return atom.className + '$' + atom.objectId;
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}
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return {
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__type: 'Pointer',
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className: atom.className,
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objectId: atom.objectId
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};
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}
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if (atom.__type == 'Date') {
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return new Date(atom.iso);
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}
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if (atom.__type == 'GeoPoint') {
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if (!inArray && !inObject) {
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return [atom.longitude, atom.latitude];
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}
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return atom;
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}
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if (atom.__type == 'Bytes') {
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return new mongodb.Binary(new Buffer(atom.base64, 'base64'));
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}
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if (atom.__type == 'File') {
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if (!inArray && !inObject) {
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return atom.name;
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}
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return atom;
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}
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if (force) {
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throw new Parse.Error(Parse.Error.INVALID_JSON,
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'bad atom: ' + atom);
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}
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return CannotTransform;
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default:
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// I don't think typeof can ever let us get here
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throw new Parse.Error(Parse.Error.INTERNAL_SERVER_ERROR,
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'really did not expect value: ' + atom);
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}
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}
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// Transforms a query constraint from REST API format to Mongo format.
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// A constraint is something with fields like $lt.
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// If it is not a valid constraint but it could be a valid something
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// else, return CannotTransform.
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// inArray is whether this is an array field.
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function transformConstraint(constraint, inArray) {
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if (typeof constraint !== 'object' || !constraint) {
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return CannotTransform;
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}
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// keys is the constraints in reverse alphabetical order.
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// This is a hack so that:
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// $regex is handled before $options
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// $nearSphere is handled before $maxDistance
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var keys = Object.keys(constraint).sort().reverse();
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var answer = {};
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for (var key of keys) {
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switch(key) {
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case '$lt':
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case '$lte':
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case '$gt':
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case '$gte':
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case '$exists':
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case '$ne':
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answer[key] = transformAtom(constraint[key], true,
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{inArray: inArray});
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break;
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case '$in':
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case '$nin':
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var arr = constraint[key];
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if (!(arr instanceof Array)) {
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throw new Parse.Error(Parse.Error.INVALID_JSON,
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'bad ' + key + ' value');
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}
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answer[key] = arr.map((v) => {
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return transformAtom(v, true);
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});
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break;
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case '$all':
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var arr = constraint[key];
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if (!(arr instanceof Array)) {
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throw new Parse.Error(Parse.Error.INVALID_JSON,
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'bad ' + key + ' value');
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}
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answer[key] = arr.map((v) => {
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return transformAtom(v, true, { inArray: true });
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});
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break;
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case '$regex':
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var s = constraint[key];
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if (typeof s !== 'string') {
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throw new Parse.Error(Parse.Error.INVALID_JSON, 'bad regex: ' + s);
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}
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answer[key] = s;
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break;
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case '$options':
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var options = constraint[key];
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if (!answer['$regex'] || (typeof options !== 'string')
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|| !options.match(/^[imxs]+$/)) {
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throw new Parse.Error(Parse.Error.INVALID_QUERY,
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'got a bad $options');
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}
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answer[key] = options;
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break;
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case '$nearSphere':
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var point = constraint[key];
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answer[key] = [point.longitude, point.latitude];
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break;
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case '$maxDistance':
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answer[key] = constraint[key];
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break;
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// The SDKs don't seem to use these but they are documented in the
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// REST API docs.
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case '$maxDistanceInRadians':
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answer['$maxDistance'] = constraint[key];
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break;
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case '$maxDistanceInMiles':
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answer['$maxDistance'] = constraint[key] / 3959;
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break;
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case '$maxDistanceInKilometers':
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answer['$maxDistance'] = constraint[key] / 6371;
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break;
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case '$select':
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case '$dontSelect':
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throw new Parse.Error(
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Parse.Error.COMMAND_UNAVAILABLE,
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'the ' + key + ' constraint is not supported yet');
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case '$within':
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var box = constraint[key]['$box'];
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if (!box || box.length != 2) {
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throw new Parse.Error(
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Parse.Error.INVALID_JSON,
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'malformatted $within arg');
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}
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answer[key] = {
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'$box': [
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[box[0].longitude, box[0].latitude],
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[box[1].longitude, box[1].latitude]
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]
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};
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break;
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default:
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if (key.match(/^\$+/)) {
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throw new Parse.Error(
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Parse.Error.INVALID_JSON,
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'bad constraint: ' + key);
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}
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return CannotTransform;
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}
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}
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return answer;
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}
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// Transforms an update operator from REST format to mongo format.
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// To be transformed, the input should have an __op field.
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// If flatten is true, this will flatten operators to their static
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// data format. For example, an increment of 2 would simply become a
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// 2.
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// The output for a non-flattened operator is a hash with __op being
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// the mongo op, and arg being the argument.
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// The output for a flattened operator is just a value.
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// Returns CannotTransform if this cannot transform it.
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// Returns undefined if this should be a no-op.
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function transformUpdateOperator(operator, flatten) {
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if (typeof operator !== 'object' || !operator.__op) {
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return CannotTransform;
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}
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switch(operator.__op) {
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case 'Delete':
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if (flatten) {
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return undefined;
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} else {
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return {__op: '$unset', arg: ''};
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}
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case 'Increment':
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if (typeof operator.amount !== 'number') {
|
|
throw new Parse.Error(Parse.Error.INVALID_JSON,
|
|
'incrementing must provide a number');
|
|
}
|
|
if (flatten) {
|
|
return operator.amount;
|
|
} else {
|
|
return {__op: '$inc', arg: operator.amount};
|
|
}
|
|
|
|
case 'Add':
|
|
case 'AddUnique':
|
|
if (!(operator.objects instanceof Array)) {
|
|
throw new Parse.Error(Parse.Error.INVALID_JSON,
|
|
'objects to add must be an array');
|
|
}
|
|
var toAdd = operator.objects.map((obj) => {
|
|
return transformAtom(obj, true, { inArray: true });
|
|
});
|
|
if (flatten) {
|
|
return toAdd;
|
|
} else {
|
|
var mongoOp = {
|
|
Add: '$push',
|
|
AddUnique: '$addToSet'
|
|
}[operator.__op];
|
|
return {__op: mongoOp, arg: {'$each': toAdd}};
|
|
}
|
|
|
|
case 'Remove':
|
|
if (!(operator.objects instanceof Array)) {
|
|
throw new Parse.Error(Parse.Error.INVALID_JSON,
|
|
'objects to remove must be an array');
|
|
}
|
|
var toRemove = operator.objects.map((obj) => {
|
|
return transformAtom(obj, true, { inArray: true });
|
|
});
|
|
if (flatten) {
|
|
return [];
|
|
} else {
|
|
return {__op: '$pullAll', arg: toRemove};
|
|
}
|
|
|
|
default:
|
|
throw new Parse.Error(
|
|
Parse.Error.COMMAND_UNAVAILABLE,
|
|
'the ' + operator.__op + ' op is not supported yet');
|
|
}
|
|
}
|
|
|
|
|
|
// Converts from a mongo-format object to a REST-format object.
|
|
// Does not strip out anything based on a lack of authentication.
|
|
function untransformObject(schema, className, mongoObject) {
|
|
switch(typeof mongoObject) {
|
|
case 'string':
|
|
case 'number':
|
|
case 'boolean':
|
|
return mongoObject;
|
|
case 'undefined':
|
|
case 'symbol':
|
|
case 'function':
|
|
throw 'bad value in untransformObject';
|
|
case 'object':
|
|
if (mongoObject === null) {
|
|
return null;
|
|
}
|
|
|
|
if (mongoObject instanceof Array) {
|
|
return mongoObject.map((o) => {
|
|
return untransformObject(schema, className, o);
|
|
});
|
|
}
|
|
|
|
if (mongoObject instanceof Date) {
|
|
return Parse._encode(mongoObject);
|
|
}
|
|
|
|
if (mongoObject instanceof mongodb.Binary) {
|
|
return {
|
|
__type: 'Bytes',
|
|
base64: mongoObject.buffer.toString('base64')
|
|
};
|
|
}
|
|
|
|
var restObject = untransformACL(mongoObject);
|
|
for (var key in mongoObject) {
|
|
switch(key) {
|
|
case '_id':
|
|
restObject['objectId'] = '' + mongoObject[key];
|
|
break;
|
|
case '_hashed_password':
|
|
restObject['password'] = mongoObject[key];
|
|
break;
|
|
case '_acl':
|
|
case '_email_verify_token':
|
|
case '_perishable_token':
|
|
break;
|
|
case '_session_token':
|
|
restObject['sessionToken'] = mongoObject[key];
|
|
break;
|
|
case 'updatedAt':
|
|
case '_updated_at':
|
|
restObject['updatedAt'] = Parse._encode(new Date(mongoObject[key])).iso;
|
|
break;
|
|
case 'createdAt':
|
|
case '_created_at':
|
|
restObject['createdAt'] = Parse._encode(new Date(mongoObject[key])).iso;
|
|
break;
|
|
case 'expiresAt':
|
|
case '_expiresAt':
|
|
restObject['expiresAt'] = Parse._encode(new Date(mongoObject[key])).iso;
|
|
break;
|
|
case '_auth_data_anonymous':
|
|
restObject['authData'] = restObject['authData'] || {};
|
|
restObject['authData']['anonymous'] = mongoObject[key];
|
|
break;
|
|
case '_auth_data_facebook':
|
|
restObject['authData'] = restObject['authData'] || {};
|
|
restObject['authData']['facebook'] = mongoObject[key];
|
|
break;
|
|
default:
|
|
if (key.indexOf('_p_') == 0) {
|
|
var newKey = key.substring(3);
|
|
var expected;
|
|
if (schema && schema.getExpectedType) {
|
|
expected = schema.getExpectedType(className, newKey);
|
|
}
|
|
if (!expected) {
|
|
console.log(
|
|
'Found a pointer column not in the schema, dropping it.',
|
|
className, newKey);
|
|
break;
|
|
}
|
|
if (expected && expected[0] != '*') {
|
|
console.log('Found a pointer in a non-pointer column, dropping it.', className, key);
|
|
break;
|
|
}
|
|
if (mongoObject[key] === null) {
|
|
break;
|
|
}
|
|
var objData = mongoObject[key].split('$');
|
|
var newClass = (expected ? expected.substring(1) : objData[0]);
|
|
if (objData[0] !== newClass) {
|
|
throw 'pointer to incorrect className';
|
|
}
|
|
restObject[newKey] = {
|
|
__type: 'Pointer',
|
|
className: objData[0],
|
|
objectId: objData[1]
|
|
};
|
|
break;
|
|
} else if (key[0] == '_' && key != '__type') {
|
|
throw ('bad key in untransform: ' + key);
|
|
//} else if (mongoObject[key] === null) {
|
|
//break;
|
|
} else {
|
|
var expected = schema.getExpectedType(className, key);
|
|
if (expected == 'file' && mongoObject[key]) {
|
|
restObject[key] = {
|
|
__type: 'File',
|
|
name: mongoObject[key]
|
|
};
|
|
break;
|
|
}
|
|
if (expected == 'geopoint') {
|
|
restObject[key] = {
|
|
__type: 'GeoPoint',
|
|
latitude: mongoObject[key][1],
|
|
longitude: mongoObject[key][0]
|
|
};
|
|
break;
|
|
}
|
|
}
|
|
restObject[key] = untransformObject(schema, className,
|
|
mongoObject[key]);
|
|
}
|
|
}
|
|
return restObject;
|
|
default:
|
|
throw 'unknown js type';
|
|
}
|
|
}
|
|
|
|
module.exports = {
|
|
transformKey: transformKey,
|
|
transformCreate: transformCreate,
|
|
transformUpdate: transformUpdate,
|
|
transformWhere: transformWhere,
|
|
untransformObject: untransformObject
|
|
};
|
|
|