### YGGo! - Distributed & Open Source Web Search Engine

_Проект присвячується захисникам міста Бахмут_

Written by inspiration to explore [Yggdrasil](https://yggdrasil-network.github.io) ecosystem, because of last [YaCy](https://yacy.net/) node there was discontinued.
This engine also could be useful for crawling regular websites, small business resources, local networks.

The project goal - simple interface, clear architecture and lightweight server requirement.

#### Overview

![Home page](https://github.com/YGGverse/YGGo/blob/main/media/main-sm.png?raw=true)

https://github.com/YGGverse/YGGo/tree/main/media

#### Online instances

* [http://[201:23b4:991a:634d:8359:4521:5576:15b7]/yggo](http://[201:23b4:991a:634d:8359:4521:5576:15b7]/yggo)
* [http://94.140.114.241/yggo/](http://94.140.114.241/yggo)

#### Requirements

```
php8^
php-dom
php-pdo
php-curl
php-gd
php-mbstring
php-zip
php-mysql
sphinxsearch
```

#### Installation

* The web root dir is `/public`
* Deploy the database using [MySQL Workbench](https://www.mysql.com/products/workbench) project presented in the `/database` folder
* Install [Sphinx Search Server](https://sphinxsearch.com), [MEGAcmd](https://mega.nz/cmd) (on remote snaps enabled)
* Configuration examples presented at `/config` folder
* Make sure `/storage/cache`, `/storage/tmp`, `/storage/snap` folders are writable
* Set up the `/crontab` by following [example](https://github.com/YGGverse/YGGo/blob/main/config/crontab.txt)

#### JSON API

Build third party applications / index distribution.

Could be enabled or disabled by `API_ENABLED` option

###### Address

```
/api.php
```

##### Search

Returns search results.

Could be enabled or disabled by `API_SEARCH_ENABLED` option

###### Request attributes

```
GET action=search  - required
GET query={string} - optional, search request, empty if not provided
GET type={string}  - optional, filter mime type of available or empty
GET page={int}     - optional, search results page, 1 if not provided
GET mode=SphinxQL  - optional, enable extended SphinxQL syntax
```

##### Hosts distribution

Returns hosts collected with fields provided in `API_HOSTS_FIELDS` option.

Could be enabled or disabled by `API_HOSTS_ENABLED` option

###### Request attributes

```
GET action=hosts - required
```

##### Application manifest

Returns node information for other nodes that have same `CRAWL_MANIFEST_API_VERSION` and `CRAWL_URL_REGEXP` conditions.

Could be enabled or disabled by `API_MANIFEST_ENABLED` option

###### Request attributes

```
GET action=manifest - required
```

#### Search textual filtering

##### Default constructions

```
word prefix:

yg*

operator OR:

hello | world

operator MAYBE:

hello MAYBE world

operator NOT:

hello -world

strict order operator (aka operator "before"):

aaa << bbb << ccc

exact form modifier:

raining =cats and =dogs

field-start and field-end modifier:

^hello world$

keyword IDF boost modifier:

boosted^1.234 boostedfieldend$^1.234

```

##### Extended syntax

https://sphinxsearch.com/docs/current.html#extended-syntax

Could be enabled with following attributes

```
GET m=SphinxQL
```

#### Roadmap

##### Basic features

* [x] Web pages full text ranking search
  + [x] Sphinx
* [x] Unlimited content MIME crawling
* [x] Flexible settings compatible with IPv4/IPv6 networks
* [x] Extended search syntax support
* [x] Compressed page history snaps with multi-provider storage sync
  + [x] Local
  + [x] Remote
    + [x] MEGAcmd/FTP
    + [ ] Yggdrasil over NAT
  + [x] Privacy-oriented downloads counting, traffic controls

##### UI

* [x] CSS only, JS-less interface
* [x] Unique host ident icons
* [x] Content genre tabs (#1)
* [x] Page index explorer
  + [x] Meta
  + [x] Snaps history
  + [x] Referrers
* [ ] Safe media preview
* [ ] Results with found matches highlight
* [ ] The time machine feature by content snaps history

##### API

* [ ] Index API
  + [x] Manifest
  + [x] Search
  + [x] Hosts
  + [ ] Snaps
* [ ] Context advertising API

##### Crawler

* [x] Auto crawl links by regular expression rules
  + [x] Pages
  + [x] Manifests
* [x] Robots.txt / robots meta tags support (#2)
* [x] Specific rules configuration for every host
* [x] Auto stop crawling on disk quota reached
* [x] Transactions support to prevent data loss on queue failures
* [x] Distributed index crawling between YGGo nodes trough manifest API
* [x] MIME Content-type settings
* [x] Ban non-condition links to prevent extra requests
* [x] Debug log
* [x] Index homepages and shorter URI with higher priority
* [x] Collect target location links on page redirect available
* [ ] Host page DOM elements collecting by CSS selectors
  * [ ] Custom settings for each host
* [ ] XML Feeds support
  + [ ] Sitemap
  + [ ] RSS
  + [ ] Atom
* [ ] Palette image index / filter
* [ ] Crawl queue balancer, that depends of CPU available

##### Cleaner

* [x] Deprecated DB items auto deletion / host settings update
  + [x] Pages
  + [x] Snaps
    + [x] Snap downloads
    + [ ] Missed snap file relations
  + [x] Manifests
  + [x] Logs
    + [x] Crawler
    + [x] Cleaner
* [x] Banned resources reset by timeout
* [x] DB tables optimization
* [x] Debug log

##### CLI

* [x] help
* [x] crawl
* [x] clean
* [x] hostPageDom
  + [x] generate
  + [x] truncate
* [ ] hostPage
  + [ ] add

##### Other

* [ ] Administrative panel for useful index moderation
* [ ] Deployment tools
* [ ] Testing
* [ ] Documentation

#### Contributions

Please make a new branch of master|sqliteway tree for each patch in your fork before create PR

```
git checkout master
git checkout -b my-pr-branch-name
```

See also: [SQLite tree](https://github.com/YGGverse/YGGo/tree/sqliteway)

#### Donate to contributors

* @d47081: [BTC](https://www.blockchain.com/explorer/addresses/btc/bc1qngdf2kwty6djjqpk0ynkpq9wmlrmtm7e0c534y) | [DOGE](https://dogechain.info/address/D5Sez493ibLqTpyB3xwQUspZvJ1cxEdRNQ) | Support our server by order [Linux VPS](https://www.yourserver.se/portal/aff.php?aff=610) or [MEGA Cloud](https://mega.nz/storage/aff=ZFoA1lNcnTs)

#### License
* Engine sources [MIT License](https://github.com/YGGverse/YGGo/blob/main/LICENSE)
* HTML parser [simple_html_dom](http://sourceforge.net/projects/simplehtmldom/)
* Home page animation by [alvarotrigo](https://codepen.io/alvarotrigo/pen/GRvYNax)
* CLI logo by [patorjk.com](https://patorjk.com/software/taag/#p=display&f=Slant&t=YGGo!)

#### See also

* [YGGwave ~ The Radio Catalog](https://github.com/YGGverse/YGGwave)

#### Feedback

Please, feel free to share your ideas and bug reports [here](https://github.com/YGGverse/YGGo/issues) or use sources for your own implementations.

Have a good time!