400 lines
9.0 KiB
JavaScript
400 lines
9.0 KiB
JavaScript
/* jslint node: true */
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'use strict';
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const fileDb = require('./database.js').dbs.file;
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const Errors = require('./enig_error.js').Errors;
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const getISOTimestampString = require('./database.js').getISOTimestampString;
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const Config = require('./config.js').config;
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// deps
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const async = require('async');
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const _ = require('lodash');
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const paths = require('path');
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const FILE_TABLE_MEMBERS = [
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'file_id', 'area_tag', 'file_sha256', 'file_name', 'storage_tag',
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'desc', 'desc_long', 'upload_timestamp'
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];
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const FILE_WELL_KNOWN_META = {
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// name -> *read* converter, if any
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upload_by_username : null,
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upload_by_user_id : null,
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file_md5 : null,
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file_sha1 : null,
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file_crc32 : null,
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est_release_year : (y) => parseInt(y) || new Date().getFullYear(),
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dl_count : (d) => parseInt(d) || 0,
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byte_size : (b) => parseInt(b) || 0,
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archive_type : null,
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};
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module.exports = class FileEntry {
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constructor(options) {
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options = options || {};
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this.fileId = options.fileId || 0;
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this.areaTag = options.areaTag || '';
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this.meta = options.meta || {
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// values we always want
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dl_count : 0,
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};
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this.hashTags = options.hashTags || new Set();
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this.fileName = options.fileName;
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this.storageTag = options.storageTag;
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}
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static loadBasicEntry(fileId, dest, cb) {
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if(!cb && _.isFunction(dest)) {
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cb = dest;
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dest = this;
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}
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fileDb.get(
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`SELECT ${FILE_TABLE_MEMBERS.join(', ')}
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FROM file
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WHERE file_id=?
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LIMIT 1;`,
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[ fileId ],
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(err, file) => {
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if(err) {
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return cb(err);
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}
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if(!file) {
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return cb(Errors.DoesNotExist('No file is available by that ID'));
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}
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// assign props from |file|
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FILE_TABLE_MEMBERS.forEach(prop => {
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dest[_.camelCase(prop)] = file[prop];
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});
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return cb(null);
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}
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);
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}
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load(fileId, cb) {
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const self = this;
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async.series(
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[
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function loadBasicEntry(callback) {
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FileEntry.loadBasicEntry(fileId, self, callback);
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},
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function loadMeta(callback) {
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return self.loadMeta(callback);
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},
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function loadHashTags(callback) {
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return self.loadHashTags(callback);
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},
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function loadUserRating(callback) {
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return self.loadRating(callback);
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}
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],
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err => {
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return cb(err);
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}
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);
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}
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persist(cb) {
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const self = this;
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async.series(
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[
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function startTrans(callback) {
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return fileDb.run('BEGIN;', callback);
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},
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function storeEntry(callback) {
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fileDb.run(
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`REPLACE INTO file (area_tag, file_sha256, file_name, storage_tag, desc, desc_long, upload_timestamp)
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VALUES(?, ?, ?, ?, ?, ?, ?);`,
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[ self.areaTag, self.fileSha256, self.fileName, self.storageTag, self.desc, self.descLong, getISOTimestampString() ],
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function inserted(err) { // use non-arrow func for 'this' scope / lastID
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if(!err) {
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self.fileId = this.lastID;
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}
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return callback(err);
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}
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);
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},
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function storeMeta(callback) {
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async.each(Object.keys(self.meta), (n, next) => {
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const v = self.meta[n];
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return FileEntry.persistMetaValue(self.fileId, n, v, next);
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},
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err => {
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return callback(err);
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});
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},
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function storeHashTags(callback) {
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const hashTagsArray = Array.from(self.hashTags);
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async.each(hashTagsArray, (hashTag, next) => {
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return FileEntry.persistHashTag(self.fileId, hashTag, next);
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},
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err => {
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return callback(err);
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});
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}
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],
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err => {
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// :TODO: Log orig err
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fileDb.run(err ? 'ROLLBACK;' : 'COMMIT;', err => {
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return cb(err);
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});
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}
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);
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}
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static getAreaStorageDirectoryByTag(storageTag) {
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const storageLocation = (storageTag && Config.fileBase.storageTags[storageTag]);
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// absolute paths as-is
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if(storageLocation && '/' === storageLocation.charAt(0)) {
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return storageLocation;
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}
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// relative to |areaStoragePrefix|
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return paths.join(Config.fileBase.areaStoragePrefix, storageLocation || '');
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}
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get filePath() {
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const storageDir = FileEntry.getAreaStorageDirectoryByTag(this.storageTag);
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return paths.join(storageDir, this.fileName);
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}
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static persistUserRating(fileId, userId, rating, cb) {
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return fileDb.run(
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`REPLACE INTO file_user_rating (file_id, user_id, rating)
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VALUES (?, ?, ?);`,
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[ fileId, userId, rating ],
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cb
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);
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}
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static persistMetaValue(fileId, name, value, cb) {
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return fileDb.run(
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`REPLACE INTO file_meta (file_id, meta_name, meta_value)
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VALUES (?, ?, ?);`,
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[ fileId, name, value ],
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cb
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);
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}
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static incrementAndPersistMetaValue(fileId, name, incrementBy, cb) {
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incrementBy = incrementBy || 1;
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fileDb.run(
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`UPDATE file_meta
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SET meta_value = meta_value + ?
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WHERE file_id = ? AND meta_name = ?;`,
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[ incrementBy, fileId, name ],
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err => {
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if(cb) {
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return cb(err);
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}
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}
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);
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}
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loadMeta(cb) {
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fileDb.each(
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`SELECT meta_name, meta_value
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FROM file_meta
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WHERE file_id=?;`,
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[ this.fileId ],
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(err, meta) => {
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if(meta) {
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const conv = FILE_WELL_KNOWN_META[meta.meta_name];
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this.meta[meta.meta_name] = conv ? conv(meta.meta_value) : meta.meta_value;
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}
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},
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err => {
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return cb(err);
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}
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);
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}
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static persistHashTag(fileId, hashTag, cb) {
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fileDb.serialize( () => {
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fileDb.run(
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`INSERT OR IGNORE INTO hash_tag (hash_tag)
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VALUES (?);`,
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[ hashTag ]
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);
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fileDb.run(
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`REPLACE INTO file_hash_tag (hash_tag_id, file_id)
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VALUES (
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(SELECT hash_tag_id
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FROM hash_tag
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WHERE hash_tag = ?),
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?
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);`,
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[ hashTag, fileId ],
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err => {
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return cb(err);
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}
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);
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});
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}
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loadHashTags(cb) {
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fileDb.each(
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`SELECT ht.hash_tag_id, ht.hash_tag
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FROM hash_tag ht
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WHERE ht.hash_tag_id IN (
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SELECT hash_tag_id
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FROM file_hash_tag
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WHERE file_id=?
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);`,
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[ this.fileId ],
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(err, hashTag) => {
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if(hashTag) {
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this.hashTags.add(hashTag.hash_tag);
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}
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},
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err => {
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return cb(err);
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}
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);
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}
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loadRating(cb) {
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fileDb.get(
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`SELECT AVG(fur.rating) AS avg_rating
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FROM file_user_rating fur
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INNER JOIN file f
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ON f.file_id = fur.file_id
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AND f.file_id = ?`,
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[ this.fileId ],
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(err, result) => {
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if(result) {
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this.userRating = result.avg_rating;
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}
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return cb(err);
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}
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);
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}
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setHashTags(hashTags) {
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if(_.isString(hashTags)) {
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this.hashTags = new Set(hashTags.split(/[\s,]+/));
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} else if(Array.isArray(hashTags)) {
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this.hashTags = new Set(hashTags);
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} else if(hashTags instanceof Set) {
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this.hashTags = hashTags;
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}
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}
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static getWellKnownMetaValues() { return Object.keys(FILE_WELL_KNOWN_META); }
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static findFiles(filter, cb) {
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filter = filter || {};
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let sql;
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let sqlWhere = '';
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let sqlOrderBy;
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const sqlOrderDir = 'ascending' === filter.order ? 'ASC' : 'DESC';
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function getOrderByWithCast(ob) {
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if( [ 'dl_count', 'est_release_year', 'byte_size' ].indexOf(filter.sort) > -1 ) {
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return `ORDER BY CAST(${ob} AS INTEGER)`;
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}
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return `ORDER BY ${ob}`;
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}
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function appendWhereClause(clause) {
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if(sqlWhere) {
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sqlWhere += ' AND ';
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} else {
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sqlWhere += ' WHERE ';
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}
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sqlWhere += clause;
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}
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if(filter.sort && filter.sort.length > 0) {
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if(Object.keys(FILE_WELL_KNOWN_META).indexOf(filter.sort) > -1) { // sorting via a meta value?
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sql =
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`SELECT f.file_id
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FROM file f, file_meta m`;
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appendWhereClause(`f.file_id = m.file_id AND m.meta_name="${filter.sort}"`);
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sqlOrderBy = `${getOrderByWithCast('m.meta_value')} ${sqlOrderDir}`;
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} else {
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// additional special treatment for user ratings: we need to average them
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if('user_rating' === filter.sort) {
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sql =
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`SELECT f.file_id,
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(SELECT IFNULL(AVG(rating), 0) rating
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FROM file_user_rating
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WHERE file_id = f.file_id)
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AS avg_rating
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FROM file f`;
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sqlOrderBy = `ORDER BY avg_rating ${sqlOrderDir}`;
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} else {
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sql =
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`SELECT f.file_id, f.${filter.sort}
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FROM file f`;
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sqlOrderBy = getOrderByWithCast(`f.${filter.sort}`) + ' ' + sqlOrderDir;
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}
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}
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} else {
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sql =
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`SELECT f.file_id
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FROM file`;
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sqlOrderBy = `${getOrderByWithCast('f.file_id')} ${sqlOrderDir}`;
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}
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if(filter.areaTag && filter.areaTag.length > 0) {
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appendWhereClause(`f.area_tag="${filter.areaTag}"`);
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}
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if(filter.terms && filter.terms.length > 0) {
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appendWhereClause(
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`f.file_id IN (
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SELECT rowid
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FROM file_fts
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WHERE file_fts MATCH "${filter.terms.replace(/"/g,'""')}"
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)`
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);
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}
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if(filter.tags && filter.tags.length > 0) {
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// build list of quoted tags; filter.tags comes in as a space separated values
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const tags = filter.tags.split(' ').map( tag => `"${tag}"` ).join(',');
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appendWhereClause(
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`f.file_id IN (
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SELECT file_id
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FROM file_hash_tag
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WHERE hash_tag_id IN (
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SELECT hash_tag_id
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FROM hash_tag
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WHERE hash_tag IN (${tags})
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)
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)`
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);
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}
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sql += `${sqlWhere} ${sqlOrderBy};`;
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const matchingFileIds = [];
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fileDb.each(sql, (err, fileId) => {
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if(fileId) {
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matchingFileIds.push(fileId.file_id);
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}
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}, err => {
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return cb(err, matchingFileIds);
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});
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}
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};
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