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const chrono = require('chrono-node');
class QueryHelper {
static parsers = {
before: val => QueryHelper.parseChronoList(val),
after: val => QueryHelper.parseChronoList(val),
tag: val => QueryHelper.sanitizeTags(val)
};
static requirementHandlers = {
album: knex => knex
.join('albumsFiles', 'files.id', '=', 'albumsFiles.fileId')
.join('albums', 'albumsFiles.albumId', '=', 'album.id'),
tag: knex => knex
.join('fileTags', 'files.id', '=', 'fileTags.fileId')
.join('tags', 'fileTags.tagId', '=', 'tags.id')
}
static fieldToSQLMapping = {
album: 'albums.name',
tag: 'tags.name',
before: 'files.createdAt',
after: 'files.createdAt'
}
static handlers = {
album({ db, knex }, list) {
return QueryHelper.generateInclusionForAlbums(db, knex, list);
},
tag({ db, knex }, list) {
list = QueryHelper.parsers.tag(list);
return QueryHelper.generateInclusionForTags(db, knex, list);
},
before({ knex }, list) {
list = QueryHelper.parsers.before(list);
return QueryHelper.generateBefore(knex, 'before', list);
},
after({ knex }, list) {
list = QueryHelper.parsers.after(list);
return QueryHelper.generateAfter(knex, 'after', list);
},
file({ knex }, list) {
return QueryHelper.generateLike(knex, 'name', list);
},
exclude({ db, knex }, dict) {
for (const [key, value] of Object.entries(dict)) {
if (key === 'album') {
knex = QueryHelper.generateExclusionForAlbums(db, knex, value);
}
if (key === 'tag') {
const parsed = QueryHelper.parsers.tag(value);
knex = QueryHelper.generateExclusionForTags(db, knex, parsed);
}
}
return knex;
}
}
static verify(field, list) {
if (!Array.isArray(list)) {
throw new Error(`Expected Array got ${typeof list}`);
}
if (typeof field !== 'string') {
throw new Error(`Expected string got ${typeof field}`);
}
return true;
}
static getMapping(field) {
if (!QueryHelper.fieldToSQLMapping[field]) {
throw new Error(`No SQL mapping for ${field} field found`);
}
return QueryHelper.fieldToSQLMapping[field];
}
static generateIn(knex, field, list) {
QueryHelper.verify(field, list);
return knex.whereIn(QueryHelper.getMapping(field), list);
}
static generateNotIn(knex, field, list) {
QueryHelper.verify(field, list);
return knex.whereNotExists(QueryHelper.getMapping(field), list);
}
static generateBefore(knex, field, list) {
QueryHelper.verify(field, list);
}
static generateAfter(knex, field, list) {
QueryHelper.verify(field, list);
}
static parseChronoList(list) {
return list.map(e => chrono.parse(e));
}
static sanitizeTags(list) {
return list.map(e => e.replace(/\s/g, '_'));
}
static generateInclusionForTags(db, knex, list) {
const subQ = db.table('fileTags')
.select('fileTags.fileId')
.join('tags', 'fileTags.tagId', '=', 'tags.id')
.where(builder => list.map(l => builder.orWhere('tags.name', 'like', l)))
.groupBy('fileTags.fileId')
.havingRaw('count(distinct tags.name) = ?', [list.length]);
return knex.whereIn('files.id', subQ);
}
static generateInclusionForAlbums(db, knex, list) {
const subQ = db.table('albumsFiles')
.select('albumsFiles.fileId')
.join('albums', 'albumsFiles.albumId', '=', 'albums.id')
.where(builder => list.map(l => builder.orWhere('albums.name', 'like', l)))
.groupBy('albumsFiles.fileId')
.havingRaw('count(distinct albums.name) = ?', [list.length]);
return knex.whereIn('files.id', subQ);
}
static generateExclusionForTags(db, knex, list) {
const subQ = db.table('fileTags')
.select('fileTags.fileId')
.join('tags', 'fileTags.tagId', '=', 'tags.id')
.where(builder => list.map(l => builder.orWhere('tags.name', 'like', l)));
return knex.whereNotIn('files.id', subQ);
}
static generateExclusionForAlbums(db, knex, list) {
const subQ = db.table('albumsFiles')
.select('albumsFiles.fileId')
.join('albums', 'albumsFiles.albumId', '=', 'albums.id')
.where(builder => list.map(l => builder.orWhere('albums.name', 'like', l)));
return knex.whereNotIn('files.id', subQ);
}
static generateLike(knex, field, list) {
for (const str of list) {
knex = knex.where(field, 'like', `${str}%`);
}
return knex;
}
static loadRequirements(knex, queryObject) {
// sanity check so we don't accidentally require the same thing twice
const loadedRequirements = [];
for (const key of Object.keys(queryObject)) {
if (QueryHelper.requirementHandlers[key] && loadedRequirements.indexOf(key) === -1) {
knex = QueryHelper.requirementHandlers[key](knex);
loadedRequirements.push(key);
}
}
return knex;
}
static mergeTextWithTags(queryObject) {
if (queryObject.text) {
let { text } = queryObject;
if (!Array.isArray(text)) { text = [text]; }
queryObject.tag = [...(queryObject.tag || []), ...text];
}
if (queryObject.exclude && queryObject.exclude.text) {
let { text } = queryObject.exclude;
if (!Array.isArray(text)) { text = [text]; }
queryObject.exclude.tag = [...(queryObject.exclude.tag || []), ...text];
}
return queryObject;
}
static processQuery(db, knex, queryObject) {
queryObject = QueryHelper.mergeTextWithTags(queryObject);
// knex = QueryHelper.loadRequirements(knex, queryObject);
for (const [key, value] of Object.entries(queryObject)) {
if (QueryHelper.handlers[key]) {
knex = QueryHelper.handlers[key]({ db, knex }, value);
}
}
return knex;
}
}
module.exports = QueryHelper;
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