hydrus/downloader_intro.html

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<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="A personal booru-style media tagger that can import files and tags from your hard drive and popular websites. Content can be shared with other users via user-run servers.">
<link rel="canonical" href="https://hydrusnetwork.github.io/hydrus/downloader_intro.html">
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<title>Making a Downloader - hydrus network</title>
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<a href="index.html" title="hydrus network" class="md-header__button md-logo" aria-label="hydrus network" data-md-component="logo">
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<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
hydrus network
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</div>
<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
Making a Downloader
</span>
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Initializing search
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><!--! Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
</div>
<div class="md-source__repository">
hydrusnetwork/hydrus
</div>
</a>
</div>
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</header>
<div class="md-container" data-md-component="container">
<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
<div class="md-grid">
<ul class="md-tabs__list">
<li class="md-tabs__item">
<a href="index.html" class="md-tabs__link">
Home
</a>
</li>
<li class="md-tabs__item">
<a href="introduction.html" class="md-tabs__link">
Getting Started
</a>
</li>
<li class="md-tabs__item md-tabs__item--active">
<a href="advanced_siblings.html" class="md-tabs__link">
Advanced
</a>
</li>
<li class="md-tabs__item">
<a href="client_api.html" class="md-tabs__link">
API
</a>
</li>
<li class="md-tabs__item">
<a href="faq.html" class="md-tabs__link">
Misc
</a>
</li>
</ul>
</div>
</nav>
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<a href="index.html" title="hydrus network" class="md-nav__button md-logo" aria-label="hydrus network" data-md-component="logo">
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hydrus network
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<a href="https://github.com/hydrusnetwork/hydrus" title="Go to repository" class="md-source" data-md-component="source">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><!--! Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
</div>
<div class="md-source__repository">
hydrusnetwork/hydrus
</div>
</a>
</div>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="index.html" class="md-nav__link">
<span class="md-ellipsis">
Home
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2" >
<label class="md-nav__link" for="__nav_2" id="__nav_2_label" tabindex="">
<span class="md-ellipsis">
Getting Started
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_2_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_2">
<span class="md-nav__icon md-icon"></span>
Getting Started
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="introduction.html" class="md-nav__link">
<span class="md-ellipsis">
Introduction and Statement of Principles
</span>
</a>
</li>
<li class="md-nav__item">
<a href="gettingStartedOverview.html" class="md-nav__link">
<span class="md-ellipsis">
Overview For Getting Started
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_installing.html" class="md-nav__link">
<span class="md-ellipsis">
Installing and Updating
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_files.html" class="md-nav__link">
<span class="md-ellipsis">
Files
</span>
</a>
</li>
<li class="md-nav__item">
<a href="filetypes.html" class="md-nav__link">
<span class="md-ellipsis">
Supported Filetypes
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_importing.html" class="md-nav__link">
<span class="md-ellipsis">
Importing and Exporting
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_tags.html" class="md-nav__link">
<span class="md-ellipsis">
Tags
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_searching.html" class="md-nav__link">
<span class="md-ellipsis">
Searching and Sorting
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_more_tags.html" class="md-nav__link">
<span class="md-ellipsis">
More Tags
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_downloading.html" class="md-nav__link">
<span class="md-ellipsis">
Downloading
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_ratings.html" class="md-nav__link">
<span class="md-ellipsis">
Ratings
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2_12" >
<label class="md-nav__link" for="__nav_2_12" id="__nav_2_12_label" tabindex="">
<span class="md-ellipsis">
PTR
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_2_12_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_2_12">
<span class="md-nav__icon md-icon"></span>
PTR
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="access_keys.html" class="md-nav__link">
<span class="md-ellipsis">
PTR Access Keys
</span>
</a>
</li>
<li class="md-nav__item">
<a href="PTR.html" class="md-nav__link">
<span class="md-ellipsis">
PTR Guide
</span>
</a>
</li>
<li class="md-nav__item">
<a href="petitionPractices.html" class="md-nav__link">
<span class="md-ellipsis">
Petition Practices
</span>
</a>
</li>
</ul>
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</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2_13" >
<label class="md-nav__link" for="__nav_2_13" id="__nav_2_13_label" tabindex="">
<span class="md-ellipsis">
Next Steps
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_2_13_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_2_13">
<span class="md-nav__icon md-icon"></span>
Next Steps
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="adding_new_downloaders.html" class="md-nav__link">
<span class="md-ellipsis">
Adding New Downloaders
</span>
</a>
</li>
<li class="md-nav__item">
<a href="getting_started_subscriptions.html" class="md-nav__link">
<span class="md-ellipsis">
Subscriptions
</span>
</a>
</li>
<li class="md-nav__item">
<a href="duplicates.html" class="md-nav__link">
<span class="md-ellipsis">
Filtering Duplicates
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" checked>
<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="">
<span class="md-ellipsis">
Advanced
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="true">
<label class="md-nav__title" for="__nav_3">
<span class="md-nav__icon md-icon"></span>
Advanced
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="advanced_siblings.html" class="md-nav__link">
<span class="md-ellipsis">
Tag Siblings
</span>
</a>
</li>
<li class="md-nav__item">
<a href="advanced_parents.html" class="md-nav__link">
<span class="md-ellipsis">
Tag Parents
</span>
</a>
</li>
<li class="md-nav__item">
<a href="advanced_sidecars.html" class="md-nav__link">
<span class="md-ellipsis">
Sidecars
</span>
</a>
</li>
<li class="md-nav__item">
<a href="advanced_multiple_local_file_services.html" class="md-nav__link">
<span class="md-ellipsis">
Multiple Local File Services
</span>
</a>
</li>
<li class="md-nav__item">
<a href="advanced.html" class="md-nav__link">
<span class="md-ellipsis">
General Clever Tricks
</span>
</a>
</li>
<li class="md-nav__item">
<a href="reducing_lag.html" class="md-nav__link">
<span class="md-ellipsis">
Reducing Lag
</span>
</a>
</li>
<li class="md-nav__item">
<a href="database_migration.html" class="md-nav__link">
<span class="md-ellipsis">
Database Migration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="launch_arguments.html" class="md-nav__link">
<span class="md-ellipsis">
Launch Arguments
</span>
</a>
</li>
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<h1 id="making_a_downloader">Making a Downloader<a class="headerlink" href="#making_a_downloader" title="Permanent link">&para;</a></h1>
<div class="admonition caution">
<p class="admonition-title">Caution</p>
<p>Creating custom downloaders is only for advanced users who understand HTML or JSON. Beware! If you are simply looking for how to add new downloaders, please head over <a href="adding_new_downloaders.html">here</a>.</p>
</div>
<h2 id="intro">this system<a class="headerlink" href="#intro" title="Permanent link">&para;</a></h2>
<p>The first versions of hydrus's downloaders were all hardcoded and static--I wrote everything into the program itself and nothing was user-creatable or -fixable. After the maintenance burden of the entire messy system proved too large for me to keep up with and a semi-editable booru system proved successful, I decided to overhaul the entire thing to allow user creation and sharing of every component. It is designed to be very simple to the front-end user--they will typically handle a couple of png files and then select a new downloader from a list--but very flexible (and hence potentially complicated) on the back-end. These help pages describe the different compontents with the intention of making an HTML- or JSON- fluent user able to create and share a full new downloader on their own.</p>
<p>As always, this is all under active development. Your feedback on the system would be appreciated, and if something is confusing or you discover something in here that is out of date, please <a href="contact.html">let me know</a>.</p>
<h2 id="downloader">what is a downloader?<a class="headerlink" href="#downloader" title="Permanent link">&para;</a></h2>
<p>In hydrus, a downloader is one of:</p>
<dl>
<dt><strong>Gallery Downloader</strong></dt>
<dd>This takes a string like 'blue_eyes' to produce a series of thumbnail gallery page URLs that can be parsed for image page URLs which can ultimately be parsed for file URLs and metadata like tags. Boorus fall into this category.</dd>
<dt><strong>URL Downloader</strong></dt>
<dd>This does just the Gallery Downloader's back-end--instead of taking a string query, it takes the gallery or post URLs directly from the user, whether that is one from a drag-and-drop event or hundreds pasted from clipboard. For our purposes here, the URL Downloader is a subset of the Gallery Downloader.</dd>
<dt><strong>Watcher</strong></dt>
<dd>This takes a URL that it will check in timed intervals, parsing it for new URLs that it then queues up to be downloaded. It typically stops checking after the 'file velocity' (such as '1 new file per day') drops below a certain level. It is mostly for watching imageboard threads.</dd>
<dt><strong>Simple Downloader</strong></dt>
<dd>This takes a URL one-time and parses it for direct file URLs. This is a miscellaneous system for certain simple gallery types and some testing/'I just need the third <img> tag's <em>src</em> on this one page' jobs.</dd>
</dl>
<p>The system currently supports HTML and JSON parsing. XML should be fine under the HTML parser--it isn't strict about checking types and all that.</p>
<h2 id="pipeline">what does a downloader do?<a class="headerlink" href="#pipeline" title="Permanent link">&para;</a></h2>
<p>The Gallery Downloader is the most complicated downloader and uses all the possible components. In order for hydrus to convert our example 'blue_eyes' query into a bunch of files with tags, it needs to:</p>
<ul>
<li>Present some user interface named 'safebooru tag search' to the user that will convert their input of 'blue_eyes' into <a href="https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=0">https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=0</a>.</li>
<li>Recognise <a href="https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=0">https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=0</a> as a Safebooru Gallery URL.</li>
<li>Convert the HTML of a Safebooru Gallery URL into a list URLs like <a href="https://safebooru.org/index.php?page=post&amp;s=view&amp;id=2437965">https://safebooru.org/index.php?page=post&amp;s=view&amp;id=2437965</a> and possibly a 'next page' URL (e.g. <a href="https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=40">https://safebooru.org/index.php?page=post&amp;s=list&amp;tags=blue_eyes&amp;pid=40</a>) that points to the next page of thumbnails.</li>
<li>Recognise the <a href="https://safebooru.org/index.php?page=post&amp;s=view&amp;id=2437965">https://safebooru.org/index.php?page=post&amp;s=view&amp;id=2437965</a> URLs as Safebooru Post URLs.</li>
<li>Convert the HTML of a Safebooru Post URL into a file URL like <a href="https://safebooru.org//images/2329/b6e8c263d691d1c39a2eeba5e00709849d8f864d.jpg">https://safebooru.org//images/2329/b6e8c263d691d1c39a2eeba5e00709849d8f864d.jpg</a> and some tags like: 1girl, bangs, black gloves, blonde hair, blue eyes, braid, closed mouth, day, fingerless gloves, fingernails, gloves, grass, hair ornament, hairclip, hands clasped, creator:hankuri, interlocked fingers, long hair, long sleeves, outdoors, own hands together, parted bangs, pointy ears, character:princess zelda, smile, solo, series:the legend of zelda, underbust.</li>
</ul>
<p>So we have three components:</p>
<ul>
<li><a href="downloader_gugs.html"><strong>Gallery URL Generator (GUG):</strong></a> faces the user and converts text input into initialising Gallery URLs.</li>
<li><a href="downloader_url_classes.html"><strong>URL Class:</strong></a> identifies URLs and informs the client how to deal with them.</li>
<li><a href="downloader_parsers.html"><strong>Parser:</strong></a> converts data from URLs into hydrus-understandable metadata.</li>
</ul>
<p>URL downloaders and watchers do not need the Gallery URL Generator, as their input <em>is</em> an URL. And simple downloaders also have an explicit 'just download it and parse it with this simple rule' action, so they do not use URL Classes (or even full-fledged Page Parsers) either.</p>
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