json-valid/validate.js

A json model validate kit for NodeJS

var _ = require('underscore')
        , debug = require('debug')('validate')
        , error_code = require('./error');


var custom_models = {};

var validator = function (model) {
    this.model = model;
    this.errors = [];
};


function validate(data, model, path) {
    path = path || [];
    debug("Data:", data);
    debug("Model:", model);
    debug("Path: ", path);

    if (_.isString(model)) {
        var type = model.split(':')[0];
        var param = model.split(':')[1];
        var optional = _.last(type) === '?';
        if (optional) {
            type = type.slice(0, -1).trim();
        }
        debug("Type:", type);
        if (!optional && typeof data === 'undefined') {
            this.errors.push(error_code.error(error_code.ERR_NOT_EXIST, path));
        } else if (data) {
            var type_validator;
            try {   // try inner type
                type_validator = require('./validators/' + type.toLowerCase());
                var error = new type_validator(param).validate(data, path);
                if (!_.isEmpty(error)) {
                    this.errors.push(error);
                }
            } catch (e) {   // otherwise use user defined models
                var model = validator.model(type);
                if (model) {
                    validate.call(this, data, model, path);
                } else {
                    throw new Error("Undefined model " + type);
                }
            }
        }
    } else {
        _.each(model, function (v, k) {
            if (_.isObject(v)) {
                validate.call(this, data[k], v, path.concat([k]));
            } else if (_.isString(v)) {
                var type = v.split(':')[0];
                var param = v.split(':')[1];
                var optional = _.last(type) === '?';
                if (optional) {
                    type = type.slice(0, -1).trim();
                }
                debug("Type:", type);
                if (!optional && typeof data[k] === 'undefined') {
                    this.errors.push(error_code.error(error_code.ERR_NOT_EXIST, path.concat([k])));
                } else if (data[k]) {
                    var type_validator;
                    try {   // try inner type
                        type_validator = require('./validators/' + type.toLowerCase());
                        var error = new type_validator(param).validate(data[k], path.concat([k]));
                        if (!_.isEmpty(error)) {
                            this.errors.push(error);
                        }
                    } catch (e) {   // otherwise use user defined models
                        var model = validator.model(type);
                        if (model) {
                            validate.call(this, data[k], model, path.concat([k]));
                        } else {
                            throw new Error("Undefined model " + type);
                        }
                    }
                }
            } else {
                this.errors.push(new Error("Model gramma error!"));
            }
        }, this);
    }
}

validator.define = function (name, model) {
    custom_models[name] = model;
};

validator.model = function (name) {
    return custom_models[name];
};

validator.prototype.validate = function (data, path) {
    this.errors = [];
    validate.call(this, data, this.model, path);
    this.errors = _.flatten(this.errors);
    return this.errors;
};

exports = module.exports = validator;