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model.js
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model.js
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const path = require('path');
const fs = require('fs');
const crypto = require('crypto');
const _eval = require('eval');
const inflection = require('inflection');
const QueryParser = require(path.join(__dirname, './queryparser'));
const Logger = require(path.join(__dirname, '../common/logger/logger'));
const common = require(path.join(__dirname, '../common/common'));
const base64 = require(path.join(__dirname, '../common/base64'));
class UnknownModelError extends Error {
constructor(message) {
super(message);
this.name = "UnknownModelError";
}
}
class Model {
_shelf;
_id;
_definition;
_name;
_tableName;
_relationNames;
_book;
_extension;
_preCreateHook;
_preUpdateHook;
_preDeleteHook;
_postDeleteHook;
_postReadHook;
_bInitDone;
constructor(shelf, id, definition) {
this._shelf = shelf;
this._id = id;
this._definition = definition;
this._name = this._definition.name;
if (this._definition.tableName)
this._tableName = this._definition.tableName;
else
this._tableName = this._definition.name;
}
async initModel() {
Logger.info("Init model '" + this._name + "'");
this._relationNames = [];
if (this._definition['extensions']) {
var extension = this._definition['extensions']['server'];
if (extension) {
this._extension = _eval(extension, true);
if (this._extension.init)
await this._extension.init.bind(this)();
if (this._extension.preCreateHook)
this.setPreCreateHook(this._extension.preCreateHook);
if (this._extension.preUpdateHook)
this.setPreUpdateHook(this._extension.preUpdateHook);
if (this._extension.preDeleteHook)
this.setPreDeleteHook(this._extension.preDeleteHook);
if (this._extension.postDeleteHook)
this.setPostDeleteHook(this._extension.postDeleteHook);
if (this._extension.postReadHook)
this.setPostReadHook(this._extension.postReadHook);
}
}
var knex = this._shelf.getKnex();
var exist = await knex.schema.hasTable(this._tableName);
if (!exist) {
await knex.schema.createTable(this._tableName, async function (table) {
//table.engine('innodb');
if (this._definition.options) {
if (this._definition.options.increments)
table.increments('id');
if (this._definition.options.timestamps) {
table.timestamps(true, true);
//table.dateTime('created_at').notNullable().defaultTo(knex.raw('CURRENT_TIMESTAMP'));
//table.dateTime('updated_at').notNullable().defaultTo(knex.raw('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'));
}
}
switch (this._definition.charEncoding) {
case 'latin1':
table.charset('latin1');
//table.collate('latin1_bin');
break;
case 'utf8':
table.charset('utf8');
//table.collate('utf8_general_ci');
break;
case 'utf8mb4':
table.charset('utf8mb4');
//table.collate('utf8mb4_0900_ai_ci');
break;
default:
}
if (this._definition.attributes)
await this._addColumns(table, null, this._definition.attributes);
}.bind(this));
Logger.info("Added table '" + this._tableName + "'");
} else {
var tableInfo = await knex.table(this._tableName).columnInfo();
if (this._definition.options.timestamps) {
if (!tableInfo.hasOwnProperty('created_at') || !tableInfo.hasOwnProperty('updated_at')) {
await this._shelf.getKnex().schema.alterTable(this._tableName, async function (table) {
table.timestamps(true, true);
}.bind(this));
}
}
if (this._definition.attributes) {
await this._shelf.getKnex().schema.alterTable(this._tableName, async function (table) {
await this._addColumns(table, tableInfo, this._definition.attributes);
}.bind(this));
}
}
if (this._definition.attributes) {
var junctions = this._definition.attributes.filter(function (attribute) {
return ((attribute['dataType'] === "relation") && !attribute.via && attribute.multiple);
});
for (var junction of junctions) {
try {
await this._addJunctionTable(junction);
} catch (error) {
if (error instanceof UnknownModelError)
Logger.warning("[model: '" + this._name + "', attribute: '" + junction['name'] + "'] " + error['message']);
else
Logger.parseError(error, "[model: '" + this._name + "', attribute: '" + junction['name'] + "']");
}
}
}
this.createBook();
this._bInitDone = true;
return Promise.resolve();
}
async _addColumns(table, tableInfo, attributes) {
for (let attribute of attributes) {
if (attribute['dataType'] === "relation") {
this._relationNames.push(attribute['name']);
if (!attribute.via) {
if (!attribute.multiple) {
if (!tableInfo || !tableInfo.hasOwnProperty(attribute['name']))
this._addColumn(table, attribute);
}
}
} else if (!attribute.hasOwnProperty("persistent") || attribute.persistent === true) {
if (!tableInfo || !tableInfo.hasOwnProperty(attribute['name']))
this._addColumn(table, attribute);
else {
switch (attribute['dataType']) {
case "string":
var maxLength = tableInfo[attribute['name']]['maxLength'];
if (attribute.length && attribute.length != maxLength)
table.string(attribute.name, attribute.length).alter();
break;
}
}
}
}
return Promise.resolve();
}
_addColumn(table, attribute) {
switch (attribute['dataType']) {
case "boolean":
var column = table.boolean(attribute.name);
if (attribute.defaultValue != null && attribute.defaultValue != undefined) {
if (attribute.defaultValue)
column.defaultTo('1');
else
column.defaultTo('0');
}
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "integer":
var column;
if (attribute.length)
column = table.integer(attribute.name, attribute.length);
else
column = table.integer(attribute.name);
if (attribute.primary)
column.primary();
if (attribute.unsigned)
column.unsigned();
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "double":
var column = table.double(attribute.name);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "decimal":
var column = table.decimal(attribute.name);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "string":
var column;
if (attribute.length)
column = table.string(attribute.name, attribute.length);
else
column = table.string(attribute.name);
if (attribute.primary)
column.primary();
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
if (attribute.unique)
column.unique(); //could fail if there was no length specified
break;
case "url":
var column;
if (attribute.length)
column = table.string(attribute.name, attribute.length);
else
column = table.string(attribute.name);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "enumeration":
if (attribute.bUseString) {
var column = table.string(attribute.name);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
} else {
var column = table.enu(attribute.name, attribute.options.map(function (x) { return x['value'] }));
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
}
break;
case "text":
var column;
if (attribute.length) {
if (attribute.length <= 65535)
column = table.text(attribute.name);
else if (attribute.length <= 16777215)
column = table.text(attribute.name, 'mediumtext');
else
column = table.text(attribute.name, 'longtext');
} else
column = table.text(attribute.name);
if (attribute.charEncoding) {
switch (attribute.charEncoding) {
case 'latin1':
column.collate('latin1_bin');
break;
case 'utf8':
column.collate('utf8_general_ci');
break;
case 'utf8mb4':
column.collate('utf8mb4_0900_ai_ci');
break;
default:
}
}
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "json":
var column = table.json(attribute.name, attribute.enum);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "time":
var column = table.time(attribute.name, attribute.enum);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "date":
var column = table.date(attribute.name, attribute.enum);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "datetime":
var column = table.datetime(attribute.name, attribute.enum);
if (attribute.defaultValue)
column.defaultTo(attribute.defaultValue);
if (attribute.required)
column.notNullable();
break;
case "timestamp":
var column = table.timestamp(attribute.name, attribute.enum);
if (attribute.defaultValue) {
if (attribute.defaultValue === 'CURRENT_TIMESTAMP')
column.defaultTo(this._shelf.getKnex().raw('CURRENT_TIMESTAMP')); //table.timestamps(true, false);
else
column.defaultTo(attribute.defaultValue);
}
if (attribute.required)
column.notNullable();
break;
case "relation":
table.integer(attribute.name);
break;
case "file":
var column;
if (attribute['storage']) {
if (attribute['storage'] == 'base64') {
column = table.text(attribute['name'], 'longtext');
} else if (attribute['storage'] == 'blob') {
if (attribute['length']) {
if (attribute['length'] <= 65535)
column = table.binary(attribute['name'], attribute['length']);
else if (attribute['length'] <= 16777215)
column = table.specificType(attribute['name'], "MEDIUMBLOB");
else
column = table.specificType(attribute['name'], "LONGBLOB");
} else {
column = table.binary(attribute['name']);
}
} else if (attribute['storage'] == 'filesystem') {
if (attribute['length'])
column = table.string(attribute['name'], attribute['length']);
else
column = table.string(attribute['name']);
/*if (attribute['defaultValue'])
column.defaultTo(attribute.defaultValue);*/
if (attribute['unique'])
column.unique();
}
} else
throw new Error("[model: '" + this._name + "', attribute: '" + attribute.name + "'] missing storage information'");
if (attribute['required'])
column.notNullable();
//if (attribute['filename_prop'])
//if (attribute['url_prop'])
break;
default:
throw new Error("[model: '" + this._name + "', attribute: '" + attribute.name + "'] unknown datatype '" + attribute['dataType'] + "'");
}
Logger.info("Added column '" + attribute.name + "' to table '" + this._tableName + "'");
}
getJunctionTableName(attribute) {
var relTable;
var model = this._shelf.getModel(attribute['model']);
if (model) {
var modelTable = model.getTableName();
if (this._tableName.localeCompare(modelTable) == -1)
relTable = this._tableName + "_" + modelTable;
else
relTable = modelTable + "_" + this._tableName;
}
return relTable;
}
async _addJunctionTable(attribute) {
var knex = this._shelf.getKnex();
var model = this._shelf.getModel(attribute['model']);
if (model) {
var modelTable = model.getTableName();
var relTable = this.getJunctionTableName(attribute);
if (!await knex.schema.hasTable(relTable)) {
var id = inflection.singularize(this._tableName) + "_id";
var fid = inflection.singularize(modelTable) + "_id";
await knex.schema.createTable(relTable, function (table) {
table.increments('id').primary();
table.integer(id).unsigned().notNullable().references('id').inTable(this._tableName);
table.integer(fid).unsigned().notNullable().references('id').inTable(modelTable);
}.bind(this));
Logger.info("Added table '" + relTable + "'");
//TODO: migrate old data
var table = knex.table(this._tableName);
var tableInfo = await table.columnInfo();
if (tableInfo.hasOwnProperty(attribute['name'])) {
var resultset = await knex.select('id as ' + id, attribute['name'] + " as " + fid).from(this._tableName).where(attribute['name'], 'is not', null);
console.log(resultset);
await knex(relTable).insert(resultset);
return Promise.resolve();
}
}
} else
throw new UnknownModelError("Model '" + attribute['model'] + "' is not defined");
}
getAttribute(name) {
return this._definition.attributes.filter(function (x) { return x.name === name })[0];
}
createBook() {
var obj = {};
var shelf = this._shelf;
if (this._definition.attributes) {
for (let attribute of this._definition.attributes) {
if (attribute['dataType'] === "relation") {
if (attribute.via) {
obj[attribute.name] = function () {
var book;
var model = shelf.getModel(attribute['model']);
if (model && model.initDone())
book = model.getBook();
else
throw new Error('Faulty model \'' + attribute['model'] + '\'');
return this.hasMany(book, attribute.via);
};
} else {
if (attribute.multiple) {
obj[attribute.name] = function () {
var book;
var model = shelf.getModel(attribute['model']);
if (model && model.initDone())
book = model.getBook();
else
throw new Error('Faulty model \'' + attribute['model'] + '\'');
return this.belongsToMany(book);
};
} else {
obj[attribute.name] = function () {
var book;
var model = shelf.getModel(attribute['model']);
if (model && model.initDone())
book = model.getBook();
else
throw new Error('Faulty model \'' + attribute['model'] + '\'');
return this.belongsTo(book, attribute.name);
};
}
}
}
}
}
if (this._definition.tableName)
obj['tableName'] = this._definition.tableName;
else
obj['tableName'] = this._definition.name;
if (this._definition.options && this._definition.options.timestamps)
obj['hasTimestamps'] = true;
this._book = this._shelf.getBookshelf().Model.extend(obj);
}
setPreCreateHook(func) {
this._preCreateHook = func.bind(this);
}
setPreUpdateHook(func) {
this._preUpdateHook = func.bind(this);
}
setPreDeleteHook(func) {
this._preDeleteHook = func.bind(this);
}
setPostDeleteHook(func) {
this._postDeleteHook = func.bind(this);
}
setPostReadHook(func) {
this._postReadHook = func.bind(this);
}
initDone() {
return this._bInitDone;
}
getId() {
return this._id;
}
setId(id) {
this._id = id;
}
getDefinition() {
return this._definition;
}
setDefinition(definition) {
this._definition = definition;
}
getName() {
return this._name;
}
getTableName() {
return this._tableName;
}
getRelations() {
return this._relationNames;
}
getShelf() {
return this._shelf;
}
getBook() {
return this._book;
}
async read(id) {
var res;
if (this._bInitDone && this._book) {
var obj = await this._book.where({ 'id': id }).fetch({
'withRelated': this._relationNames,
'require': true
});
res = obj.toJSON();
if (this._postReadHook)
data = await this._postReadHook(data);
} else
throw new Error('Faulty model \'' + this._name + '\'');
return Promise.resolve(res);
}
async readAll(query, bHook = true) {
var res;
if (this._bInitDone && this._book) {
var book;
if (query)
book = this.where(query);
else
book = this._book;
var rs = await book.fetchAll({
'withRelated': this._relationNames
});
var arr = rs.toJSON();
if (this._postReadHook && bHook) {
res = [];
for (var data of arr) {
res.push(await this._postReadHook(data));
}
} else
res = arr;
} else
throw new Error('Faulty model \'' + this._name + '\'');
return Promise.resolve(res);
}
where(query) {
var book = this._book;
var qp = new QueryParser(this, book);
var keys = Object.keys(query);
if (keys.length > 0) {
var value;
for (let prop in query) { // prop of keys
value = query[prop];
if (prop === "_sort") {
var parts = value.split(':');
if (parts.length == 2) {
book = qp.getBook();
book = book.query('orderBy', parts[0], parts[1]);
qp.setBook(book);
}
} else if (prop === "_limit") {
if (value != -1) {
book = qp.getBook();
book = book.query(function (qb) {
qb.limit(value);
});
qp.setBook(book);
}
} else {
qp.query(prop, value);
}
}
}
book = qp.finalizeQuery();
return book;
}
/**
*
* @param {*} data
* @returns object
*/
async create(data) {
var res;
if (this._preCreateHook)
data = await this._preCreateHook(data);
if (this._definition.options.increments) {
var forge = await this._createForge(data);
var obj = await this._book.forge(forge).save(null, { method: 'insert' });
var id = obj['id'];
for (var str of this._relationNames) {
if (data[str] && Array.isArray(data[str])) {
var coll = obj[str]();
if (coll.relatedData.type === 'hasMany') { //relation via
var attr = this._definition.attributes.filter(function (x) { return x.name === str })[0];
if (attr)
await this._updateHasManyRelation(attr, data[str], id);
} else {
await coll.attach(data[str]);
}
}
}
obj = await obj.load(this._relationNames);
res = obj.toJSON();
} else
res = await this.upsert(data);
return Promise.resolve(res);
}
async update(id, data) {
var res;
var current;
var obj;
if (this._definition.options.increments) {
obj = await this._book.where({ 'id': id }).fetch({
'require': true
});
} else {
var key = {};
var name;
for (var attribute of this._definition.attributes) {
if (attribute['primary']) {
name = attribute['name'];
key[name] = data[name];
}
}
obj = await this._book.where(key).fetch({
'require': false
});
}
if (obj)
current = obj.toJSON();
if (this._preUpdateHook)
data = await this._preUpdateHook(current, data);
if (this._definition.options.increments) {
var forge = await this._createForge(data, current);
if (id) {
if (!forge['id'])
forge['id'] = id;
else if (forge['id'] !== id)
throw new Error("Conflict in received IDs");
} else
id = forge['id'];
if (!id)
throw new Error("ID missing");
var obj = await this._book.forge(forge).save();
for (var str of this._relationNames) {
if (data[str] && Array.isArray(data[str])) {
var coll = obj[str]();
if (coll.relatedData.type === 'hasMany') { //relation via
var attr = this._definition.attributes.filter(function (x) { return x.name === str })[0];
if (attr)
await this._updateHasManyRelation(attr, data[str], id);
} else {
await coll.detach();
await coll.attach(data[str]);
}
}
}
obj = await obj.load(this._relationNames);
res = obj.toJSON()
} else
res = await this.upsert(data);
return Promise.resolve(res);
}
async upsert(data) {
var res;
await this._shelf.getKnex()(this._tableName).insert(data).onConflict().merge();
var obj = await this._book.where(data).fetch({
'withRelated': this._relationNames,
'require': true
});
res = obj.toJSON();
return Promise.resolve(res);
}
async _createForge(data, old) {
var forge = {};
var attr;
for (var str in data) {
if (!this._relationNames.includes(str) || !Array.isArray(data[str])) {
attr = this._definition.attributes.filter(function (x) { return x.name === str })[0];
if (attr) {
if (attr['dataType'] === "file") {
if (attr['storage'] == 'base64') {
if (data[str]) {
if (data[str]['url'] && data[str]['url'].startsWith("http"))
forge[str] = await controller.getWebClient().fetchBase64(data[str]['url']);
else if (data[str]['base64'] && data[str]['base64'].startsWith("data:"))
forge[str] = data[str]['base64'];
} else
forge[str] = null;
} else if (attr['storage'] == 'blob') {
if (data[str]) {
if (data[str]['blob'])
forge[str] = data[str]['blob'];
} else
forge[str] = null;
} else if (attr['storage'] == 'filesystem') {
var localPath = controller.getPathForFile(attr);
if (localPath) {
if (data[str]) {
var tmpDir = await controller.getTmpDir();
var tmpFilePath;
var fileName;
if (data[str]['filename'])
fileName = data[str]['filename'];
if (data[str]['base64']) {
if (data[str]['base64'].startsWith("data:")) {
if (fileName) {
tmpFilePath = path.join(tmpDir, fileName);
if (fs.existsSync(tmpFilePath))
throw new Error("File already exists!");
} else {
var ext = base64.getExtension(data[str]['base64']);
do {
fileName = crypto.randomBytes(16).toString("hex") + '.' + ext;
tmpFilePath = path.join(tmpDir, fileName);
} while (fs.existsSync(tmpFilePath));
}
base64.createFile(tmpFilePath, data[str]['base64']);
} else
throw new Error("Invalid base64 data!");
} else if (data[str]['url']) {
if (data[str]['url'].startsWith("http")) {
if (data[str]['force'] || !attr['url_prop'] || !old || !old[attr['url_prop']] || old[attr['url_prop']] != data[str]['url']) {
if (fileName)
tmpFilePath = path.join(tmpDir, fileName);
else {
var ext = common.getFileExtensionFromUrl(data[str]['url']);
if (ext) {
ext = ext.toLowerCase();
if (ext === "jpg!d")
ext = "jpg";
fileName = `${uid}.${ext}`;
}
var uid;
do {
uid = crypto.randomBytes(16).toString("hex");
if (ext)
fileName = `${uid}.${ext}`;
else
fileName = uid;
tmpFilePath = path.join(tmpDir, fileName);
} while (fs.existsSync(tmpFilePath));
}
fileName = await controller.getWebClient().download(data[str]['url'], null, tmpFilePath);
tmpFilePath = path.join(tmpDir, fileName);
}
} else
throw new Error("Invalid URL!");
}
if (tmpFilePath) {
if (old && old[str]) {
var oldFile = path.join(localPath, old[str]);
if (fs.existsSync(oldFile))
fs.unlinkSync(oldFile);
}
// fs.rename fails if two separate partitions are involved
if (data[str]['force'])
fs.copyFileSync(tmpFilePath, path.join(localPath, fileName));
else
fs.copyFileSync(tmpFilePath, path.join(localPath, fileName), fs.constants.COPYFILE_EXCL);
fs.unlinkSync(tmpFilePath);
} else {
if (fileName) {
if (old && old[str] && old[str] != fileName) {
var oldFile = path.join(localPath, old[str]);
var newFile = path.join(localPath, fileName);
if (fs.existsSync(oldFile) && !fs.existsSync(newFile))
fs.renameSync(oldFile, newFile);
}
} else {
if (old && old[str]) {
var file = path.join(localPath, old[str]);
if (fs.existsSync(file))
fs.unlinkSync(file);
}
}
}
if (fileName)
forge[str] = fileName;
else
forge[str] = null;
} else {
//TODO: delete file if old entry exists
forge[str] = null;
}
} else
throw new Error("Invalid CDN path!");
}
if (attr['filename_prop'] && data[str]['filename'])
forge[attr['filename_prop']] = data[str]['filename'];
if (attr['url_prop']) {
if (data[str]['url']) {
if (!old || !old[attr['url_prop']] || old[attr['url_prop']] != data[str]['url'])
forge[attr['url_prop']] = data[str]['url'];
} else {
if (old && old[attr['url_prop']])
forge[attr['url_prop']] = null;
}
}
} else if (!attr.hasOwnProperty("persistent") || attr.persistent == true)
forge[str] = data[str];
} else if (str === 'id' && this._definition.options.increments) {
forge[str] = data[str];
} else
throw new Error("Undefined Attribute '" + str + "'");
}
}
return Promise.resolve(forge);
}
async _updateHasManyRelation(attr, ids, id) {
var model = this._shelf.getModel(attr['model']);
var via = attr['via'];
var o = {};
o[via] = id;
for (var i of ids) {
await model.update(i, o);
}
return Promise.resolve();
}
async delete(id) {
var res;
var obj;
if (this._definition.options.increments) {
obj = await this._book.forge({ 'id': id }).fetch({
'withRelated': this._relationNames
});
} else {
obj = await this._book.where(id).fetch({
'withRelated': this._relationNames,
'require': true
});
}
res = obj.toJSON();
if (this._preDeleteHook)
await this._preDeleteHook(res);
for (var attribute of this._definition.attributes) {
if (attribute['dataType'] === "relation") {
if (attribute['via']) {
//TODO: load attribute.model where id match and delete attribute.via property
} else if (attribute['multiple']) {
await obj[attribute['name']]().detach();
}
}
}
if (this._definition.options.increments)
await obj.destroy();
else
await this._shelf.getKnex()(this._tableName).where(id).del();
var localPath;
var filename;
var file;
for (var attribute of this._definition.attributes) {
if (attribute['dataType'] == 'file' && attribute['storage'] == 'filesystem') {
if (res[attribute['name']]) {
filename = res[attribute['name']];
localPath = controller.getPathForFile(attribute);
if (localPath) {
file = path.join(localPath, filename);
if (fs.existsSync(file))
fs.unlinkSync(file);
}
}
}
}
if (this._postDeleteHook)
await this._postDeleteHook(res);
return Promise.resolve(res);
}
}
module.exports = Model;