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background.js
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background.js
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/* Include ////////////////////////////////////////////////////*/
try
{
importScripts( '/js/include.js', '/js/lz-string.js' );
}
catch( e )
{
console.error( e );
}
/* Background worker ////////////////////////////////////////////*/
// All read book numbers
// Key: string book number
// Value: int book state, see STATE_READ
let g_ReadBooks = {};
// Basic book data such as name or image
// Get updated only in occasion that plugin come into contact with such info
// Key: string book number
// Value: Doujinshi object
let g_BookDb = {};
chrome.action.onClicked.addListener( ( tab ) =>
{
chrome.runtime.openOptionsPage();
} );
chrome.runtime.onInstalled.addListener( () =>
{
} );
chrome.runtime.onSuspend.addListener( () =>
{
// This never called somehow
console.log( "Suspending event page" );
SaveDatabase();
} );
// We dont know when chrome will unload our background task, so save quickly
const SAVE_INTERVAL = 4;
function OnUpdateFunction()
{
SaveDatabase(); // Check check dirty flag inside
setTimeout( OnUpdateFunction, SAVE_INTERVAL * 1000 ); // Recall this after some time
}
chrome.runtime.onMessage.addListener( _OnMessage );
function _OnMessage( request, sender, sendResponse )
{
//console.log( "onMessage ", request, sender.tab ? "from a content script:" + sender.tab.url : "from the extension" );
// Note: As chrome background worker can be put into sleep (unload)
// Most API will need to wait for DB to load first if message is sent from child content script just wake the worker
if( request.cmd === "setbook" )
{
_WriteBookStateFromRequestAsync( request );
}
else if( request.cmd == "getbook" )
{
_GetBookStateAsync( () => sendResponse( { books: g_ReadBooks } ) );
return true;
}
else if( request.cmd == "getfav" )
{
LoadFavorites( ( succeed, reason ) => sendResponse( { succeed, reason } ) );
return true; // This is async request, it took long
}
else if( request.cmd == "getmissinginfo" )
{
LoadMissingInfo( ( succeed, reason ) => sendResponse( { succeed, reason } ) );
return true; // This is async request, it took long
}
else if( request.cmd == "getbookinfo" )
{
GetBookInfoAsync( request.id, ( bookInfo ) => sendResponse( { bookInfo } ) );
return true;
}
else if( request.cmd == "save" )
{
g_BookStateDirty = true;
g_DbStateDirty = true;
SaveDatabase();
}
else if( request.cmd == "bookinfohint" )
{
_SaveBookInfoFromRequestAsync( request );
}
else if( request.cmd == "wipe" )
{
g_ReadBooks = {};
g_BookDb = {};
chrome.storage.local.clear();
chrome.storage.sync.clear();
SaveDatabase( true );
}
else if( request.cmd == "dump" )
{
_GetBookStateAsync( () => sendResponse( { books: g_ReadBooks, db: g_BookDb } ) );
return true; // This is async request, it took long
}
else if( request.cmd == "importDump" )
{
_GetBookStateAsync( () =>
{
MergeObject( g_ReadBooks, request.books );
MergeObject( g_BookDb, request.db );
SaveDatabase( true );
} );
return true; // This is async request, it took long
}
}
async function _WriteBookStateFromRequestAsync( request )
{
await WaitForDbToLoad();
if( request.info != null )
SetBookInfo( request.info );
SetCoverState( request.id, request.state, request.force );
}
async function _GetBookStateAsync( callback )
{
await WaitForDbToLoad();
callback();
}
async function _SaveBookInfoFromRequestAsync( request )
{
await WaitForDbToLoad();
if( request.info != null )
{
// Only write if we have seen this book in state
let bookInfo = request.info;
let state = g_ReadBooks[bookInfo.id];
if( state != null && state > 0 )
SetBookInfo( request.info );
}
}
let g_DatabaseLoaded = 0;
function InitDatabase()
{
if( g_DatabaseLoaded != 0 )
return;
g_DatabaseLoaded++;
let OnLoadBookState = function ( save )
{
g_DatabaseLoaded++;
if( save.books == null ) return;
// Use merge
console.log( "InitDatabase OnLoadBookState called" );
MergeObject( g_ReadBooks, save.books );
//console.log( 'InitDatabase books: ', Object.keys( g_ReadBooks ).length );
};
console.log( "Issue InitDatabase" );
SyncGetPartitioned( "books", OnLoadBookState ); // Migrate from 1.0.x, try in sync storage first
SyncGetPartitioned( "books", OnLoadBookState, "local" ); // Then local for 1.1.x
SyncGetPartitioned( "bookdb",
function ( save )
{
g_DatabaseLoaded++;
if( save.bookdb == null ) return;
g_BookDb = save.bookdb;
//console.log( 'InitDatabase bookdb: ', Object.keys( g_BookDb ).length );
}, "local" );
}
async function WaitForDbToLoad()
{
// Have to wait for DB to load
while( g_DatabaseLoaded < 4 )
{
console.log( "Stall to wait for g_DatabaseLoaded" );
await sleep( 50 );
}
}
async function _WaitForDbToLoadAndResponseAsync( callback )
{
await WaitForDbToLoad();
callback();
}
let g_BookStateDirty = false;
let g_DbStateDirty = false;
function SaveDatabase( force )
{
if( force || g_BookStateDirty )
{
SyncStorePartitioned( "books", g_ReadBooks, "local" ); // 1.1.x now save to local for unlimited storage
console.log( "SaveDatabase ran" );
}
if( force || g_DbStateDirty )
SyncStorePartitioned( "bookdb", g_BookDb, "local" );
g_BookStateDirty = false;
g_DbStateDirty = false;
}
function SetCoverState( id, targetState, force )
{
if( targetState === undefined )
targetState = STATE_READ;
let state = g_ReadBooks[id];
if( force || _CanBookStateTranslateFrom( state, targetState ) ) // Write only if state translation is allowed
{
console.log( `Set book state ${id} from ${state} => ${targetState}` );
g_ReadBooks[id] = targetState;
g_BookStateDirty = true;
}
}
function _CanBookStateTranslateFrom( from, to )
{
if( from === undefined )
return true; // If first state is blank, then it can turn into any
// TOREAD is special state, it is actually has priority lower then READ (1) but since we cannot have value under 1
// It is hacked for state transition here
// It can turn into any state higher than 0
if( from === STATE_TOREAD && to > 0 )
return true;
// Else, generic rule, state must be higher in number only
return to > from;
}
function SetBookInfo( bookInfo )
{
// bookInfo object must have id, name field
if( bookInfo == null || bookInfo.id == null || bookInfo.name == null )
{
console.error( "SetBookInfo passes invalid argument bookInfo", bookInfo );
return;
}
console.log( "save book info for", bookInfo.id );
g_BookDb[bookInfo.id] = bookInfo;
g_DbStateDirty = true;
}
// Request book db info, search cache or fire API.
// callback with Doujinshi object
async function GetBookInfoAsync( id, callback )
{
await WaitForDbToLoad();
// Must wait for DB to load first
if( g_BookDb[id] !== undefined )
{
callback( g_BookDb[id] );
}
// TODO: Fire nhentai API and cache
callback( undefined );
}
InitDatabase();
OnUpdateFunction(); // This will fire initial save cycle chain
/* Helper for storage partitioning //////////////////////////////////*/
function _MakeStoreSegmentName( key, index )
{
return key + "_" + index;
}
function SyncStorePartitioned( key, objectToStore, storageApi )
{
let i = 0;
let segmentName = "";
let storage = {};
let str = JSON.stringify( objectToStore );
if( storageApi === "local" )
storageApi = chrome.storage.local;
else
storageApi = chrome.storage.sync;
// Technical note: if string contains a lot of escape character, re-json it will produce more escape character
// Better gzip that
str = LZString.compressToBase64( str );
const LIMIT = storageApi.QUOTA_BYTES_PER_ITEM - key.length - 16; // Reserve 16 byte for safer margin
while( str.length > 0 )
{
segmentName = _MakeStoreSegmentName( key, i );
let thisCycle = str.length;
if( thisCycle > LIMIT )
thisCycle = LIMIT;
storage[segmentName] = str.substr( 0, thisCycle );
str = str.substring( thisCycle, str.length ); // Next part
i++;
}
// As how the fetching logic will work in reverse
// Also make sure that next i+1 chunk remain saved as empty string to know that this is terminal
// This is also required if new saving data size is shrinking from previous (has fewer chunk count)
segmentName = _MakeStoreSegmentName( key, i );
storage[segmentName] = "";
// Store all chunks
storageApi.set( storage );
}
function SyncGetPartitioned( key, callback, storageApi )
{
if( storageApi === "local" )
storageApi = chrome.storage.local;
else
storageApi = chrome.storage.sync;
_SyncGetPartitionedInternal( key, 0, "", callback, storageApi );
}
function _SyncGetPartitionedInternal( key, index, str, callback, storageApi )
{
let segmentName = _MakeStoreSegmentName( key, index );
storageApi.get( segmentName, function ( elems )
{
let data = elems[segmentName];
if( data === undefined || data === "" ) // Found terminal
{
try
{
str = LZString.decompressFromBase64( str );
// Send combined result
// But return it as same format of which storage would do
let obj = {};
obj[key] = JSON.parse( str );
callback( obj );
}
catch( error )
{
console.log( "Error in parsing data from storage", key, error );
callback( undefined );
}
}
else
{
// Deeper!
_SyncGetPartitionedInternal( key, index + 1, str + data, callback, storageApi );
}
} );
}
/* Fetching favorite //////////////////////////////////////////////*/
let g_FavAdded = 0;
function LoadFavorites( callback )
{
g_FavAdded = 0;
fetch( "https://nhentai.net/favorites/" )
.then( ( response ) =>
{
if( response.status === 429 )
{
//loadingCallback( undefined ); // Not logged in
Promise.reject( new Error( "Not logged in" ) );
}
else if( response.status === 200 )
{
LoadFavoritePage( 1, callback );
}
else
{
let errorMsg = `${response.status}: ${response.statusText}`;
Promise.reject( new Error( errorMsg ) );
console.error( `Error while loading doujinshi count (${errorMsg})` );
}
} ).
catch( ( error ) =>
{
console.error( `Error while loading doujinshi count (${error})` );
callback( false, error );
} );
}
/// Load one page of favorite into storage
function LoadFavoritePage( pageNumber, callback )
{
let target = "https://nhentai.net/favorites/?page=" + pageNumber;
console.log( "Fetch", target );
fetch( target )
.then( ( response ) =>
{
if( response.status === 200 )
return response.text();
else
Promise.reject( new Error( response.statusText ) );
} )
.then( ( text ) =>
{
let books = GetDoujinshisFromHtml( text );
books.forEach( ( book ) =>
{
g_FavAdded++;
SetBookInfo( book );
SetCoverState( book.id, STATE_FAV );
} );
if( books.length > 0 )
LoadFavoritePage( pageNumber + 1, callback );
else
callback( true, g_FavAdded );
} )
.catch( ( error ) =>
{
console.error( "Error while loading favorites page " + pageNumber + " (Code " + error + ")." );
} );
}
/// Get all doujinshis that are in a page, return an array of Doujinshi
function GetDoujinshisFromHtml( html )
{
let currDoujinshis = [];
html.split( '<div class="gallery"' ).slice( 1 ).forEach( e =>
{
let match = e.match( /<a href="\/g\/([0-9]+)\/".+img src="([^"]+)".+<div class="caption">([^<]+)<\/div>/ )
let image = match[2];
if( image.startsWith( "//" ) )
{
image = "https:" + image;
}
currDoujinshis.push( new Doujinshi( match[1], image, match[3] ) );
} );
return currDoujinshis;
}
/* Fetch book info API ////////////////////////////*/
// This will fetch only one next missing item (due to background script can be terminated)
// Caller will need to keep calling to fill all data
async function LoadMissingInfo( callback )
{
// DB is needed to know what info are missing
await WaitForDbToLoad();
// For each id in registered book, see if info is available in g_BookDb
// g_BookDb is object so use for-let
for( let id in g_ReadBooks )
{
if( g_BookDb[id] == null ) // null or undefined, has no info for that ID
{
let idInt = parseInt( id );
if( idInt == null || idInt <= 0 ) continue;
let info = await FetchBookInfoForIdAsync( id );
if( info != null )
{
SetBookInfo( info );
callback( true, id ); // This ID is done
break;
}
}
}
// If we can reach this, no more to fetch
callback( true, null );
}
function FetchBookInfoForIdAsync( id )
{
return fetch( `https://nhentai.net/api/gallery/${id}` )
.then( ( response ) =>
{
if( response.status === 200 )
{
return response.json().then( ( json ) =>
{
let bookInfo = _ExtractBookInfoFromJsonApi( json );
return bookInfo;
} );
}
else if( response.status === 404 ) // In case of not found, return dummy error bookinfo to not let this ID run again
{
let info = new Doujinshi();
info.id = id;
info.name = "** ERROR NOT FOUND ** (Book might have removed from NH)";
return info;
}
else
{
let errorMsg = `${response.status}: ${response.statusText}`;
console.error( `Error while loading FetchBookInfoForId (${errorMsg})` );
return null; // Do not reject promise here since it will throw on caller await
}
} )
.catch( ( error ) =>
{
console.error( `Error while loading FetchBookInfoForId (${error})` );
return null;
} );
}
// Returns Doujinshi (book info) object
function _ExtractBookInfoFromJsonApi( json )
{
try {
let info = new Doujinshi();
info.id = json.id;
info.name = json.title.english;
// No image URL in this API
// Tags are ignored for now
return info;
} catch (error) {
return null;
}
}
/*
let g_doujinshis = []; // User's favorite doujinshis
let g_tagsCount = {}; // In all favorite doujinshi, number of occurance for each tags
let g_blacklistTags = [];
let g_doujinshiDebug = {};
let g_suggestedDoujinshi = undefined;
var loadingCallback = undefined;
var doujinshiCallback = undefined;
var settingsDoujinshiCallback = undefined;
var settingsDebugCallback = undefined;
function SetLoadingCallback( callbackTags, callbackDoujinshi )
{
loadingCallback = callbackTags;
doujinshiCallback = callbackDoujinshi;
}
function SetSettingsCallback( callbackDoujinshi, callbackDebug )
{
settingsDoujinshiCallback = callbackDoujinshi;
settingsDebugCallback = callbackDebug;
}
function CheckForUpdates()
{
let http = new XMLHttpRequest();
http.onreadystatechange = function ()
{
if( this.readyState === 4 )
{
if( this.status === 200 )
{
if( this.responseText.includes( '<span class="count">' ) )
{
let match = /<span class="count">\(([0-9]+)\)<\/span>/.exec( this.responseText );
let doujinshiCount = parseInt( match[1] );
let responseText = this.responseText;
chrome.storage.sync.get( {
doujinshiCount: 0
}, function ( elems )
{
if( doujinshiCount !== elems.doujinshiCount )
{
g_doujinshis = [];
g_tagsCount = {};
g_doujinshiDebug = {};
LoadBlacklistedTags( responseText );
LoadFavoritePage( 1 );
}
} );
}
}
else
{
console.error( "Error while loading doujinshi count (Code " + this.status + ")." );
}
}
};
http.open( "GET", "https://nhentai.net/favorites/", true );
http.send();
}
function LoadBlacklistedTags( html )
{
g_blacklistTags = JSON.parse( /blacklisted_tags: (\[[^\]]*\])/.exec( html )[1] );
}
function GetRandomDoujinshi( url, callback )
{
let http = new XMLHttpRequest();
http.onreadystatechange = function ()
{
if( this.readyState === 4 )
{
if( this.status === 200 )
{
let match = /\?q=[^&]+&page=([0-9]+)" class="last">/.exec( this.responseText );
let maxPage = parseInt( match[1] );
GetRandomDoujinshiFromPage( url + "&page=" + ( Math.floor( Math.random() * maxPage ) + 1 ), callback );
}
else
{
console.error( "Error while loading page " + url + " (Code " + this.status + ")." );
}
}
};
http.open( "GET", url, true );
http.send();
}
/// Get a random doujinshi from a page
function GetRandomDoujinshiFromPage( url, callback )
{
let http = new XMLHttpRequest();
http.onreadystatechange = function ()
{
if( this.readyState === 4 )
{
if( this.status === 200 )
{
let doujinshis = GetDoujinshisFromHtml( this.responseText );
GetRandomDoujinshiFromList( doujinshis, 0, callback, true );
}
else
{
console.error( "Error while loading page " + url + " (Code " + this.status + ")." );
}
}
};
http.open( "GET", url, true );
http.send();
}
function GetRandomDoujinshiFromList( doujinshis, nbTries, callback, strictSearch )
{
currDoujinshi = doujinshis[Math.floor( Math.random() * doujinshis.length )];
CheckDoujinshiValid( currDoujinshi, function ()
{
g_suggestedDoujinshi = currDoujinshi;
callback( g_suggestedDoujinshi, strictSearch );
}, function ()
{
chrome.storage.sync.get( {
requestsDelay: 500,
strictSearch: true,
nbTriesBeforeDefault: 10,
defaultSearch: false,
nbTriesBeforeFail: 10
}, function ( elems )
{
let maxNbOfTries = 0;
if( elems.strictSearch )
{
maxNbOfTries = elems.nbTriesBeforeDefault;
}
if( !elems.defaultSearch )
{
maxNbOfTries += elems.nbTriesBeforeFail;
}
if( nbTries >= maxNbOfTries )
{
callback( undefined );
}
else
{
setTimeout( function ()
{
if( elems.strictSearch && nbTries < elems.nbTriesBeforeDefault )
{
GetRandomDoujinshiFromList( doujinshis, nbTries + 1, callback, true );
}
else
{
GetRandomDoujinshiFromList( doujinshis, nbTries + 1, callback, false );
}
}, elems.requestsDelay );
}
} );
}, strictSearch );
}
/// Check if a doujinshi contains the right tags
function CheckDoujinshiValid( doujinshi, callbackSuccess, callbackFailure, strictSearch )
{
let http = new XMLHttpRequest();
http.onreadystatechange = function ()
{
if( this.readyState === 4 )
{
if( this.status === 200 )
{
LoadTagsInternal( 0, "", function ( tags )
{
let isError = false;
let httpTags = JSON.parse( http.responseText ).tags;
for( let i = 0; i < httpTags.length; i++ )
{
let elem = httpTags[i];
if( ( strictSearch && elem.type == "tag" && !Object.keys( tags ).includes( 'tag/' + elem.name ) ) ||
( !strictSearch && g_blacklistTags.includes( elem.id ) ) )
{
callbackFailure();
isError = true;
return;
}
}
if( !isError )
{
callbackSuccess();
}
} );
}
else
{
console.error( "Error while loading doujinshi " + doujinshi.id + " (Code " + this.status + ")." );
}
}
};
http.open( "GET", "https://nhentai.net/api/gallery/" + + doujinshi.id, true );
http.send();
}
/// Check all doujinshi and get their tags to store them
function StoreTags( index )
{ // We wait 500 ms before checking each page so the API doesn't return a 50X error
chrome.storage.sync.get( {
requestsDelay: 500
}, function ( elems )
{
setTimeout( function ()
{
let id = g_doujinshis[index].id;
let http = new XMLHttpRequest();
http.onreadystatechange = function ()
{
if( this.readyState === 4 )
{
if( this.status === 200 )
{
let httpTags = JSON.parse( this.responseText ).tags;
for( let i = 0; i < httpTags.length; i++ )
{
let elem = httpTags[i];
if( g_blacklistTags.includes( elem.id ) )
{ // Ignore tags that were blacklisted
continue;
}
let tag = new Tag( elem.id, elem.name, elem.type );
let tagId = elem.type + "/" + elem.name;
if( g_tagsCount[tagId] === undefined )
{
g_tagsCount[tagId] = 1;
g_doujinshiDebug[tag.id] = [tag, g_doujinshis[index]];
}
else
{
g_tagsCount[tagId]++;
if( !g_doujinshiDebug[tag.id].includes( g_doujinshis[index] ) )
{
g_doujinshiDebug[tag.id].push( g_doujinshis[index] );
}
}
}
try
{
if( settingsDebugCallback !== undefined )
{
settingsDebugCallback( g_doujinshiDebug );
}
} catch( _ ) { } // Dead object
try
{
if( loadingCallback !== undefined )
{
loadingCallback( GetTagsCount() );
}
} catch( _ ) { } // Dead object
if( index + 1 < g_doujinshis.length )
{
StoreTags( index + 1 );
}
else
{
StoreTagsName();
try
{
if( loadingCallback !== undefined )
{
loadingCallback( -1 );
}
} catch( _ ) { } // Dead object
}
}
else
{
console.error( "Error while loading doujinshi page " + doujinshiId + " (Code " + this.status + ")." );
}
}
};
http.open( "GET", "https://nhentai.net/api/gallery/" + id, true );
http.send();
}, elems.requestsDelay );
} );
}
function LoadTagsInternal( index, str, callback )
{
chrome.storage.sync.get( ['tags' + index], function ( elems )
{
if( elems['tags' + index] === undefined )
{
callback( JSON.parse( str ) );
}
else
{
LoadTagsInternal( index + 1, str + elems['tags' + index], callback );
}
} );
}
/// Store tags into storage, making sure it doesn't mess with QUOTA_BYTES_PER_ITEM
function StoreTagsName()
{
CleanTagsInternal( 0, function ()
{
let i = 0;
let storage = {};
let str = JSON.stringify( g_tagsCount );
while( str.length > chrome.storage.sync.QUOTA_BYTES_PER_ITEM / 2 )
{
storage["tags" + i] = str.substr( 0, chrome.storage.sync.QUOTA_BYTES_PER_ITEM / 2 );
str = str.substring( chrome.storage.sync.QUOTA_BYTES_PER_ITEM / 2, str.length );
i++;
}
storage["tags" + i] = str;
chrome.storage.sync.set( storage );
} );
}
function CleanTagsInternal( index, callback )
{
chrome.storage.sync.get( ['tags' + index], function ( elems )
{
if( elems['tags' + index] === undefined )
{
callback();
}
else
{
let storage = {};
storage["tags" + index] = "";
chrome.storage.sync.set( storage );
CleanTagsInternal( index + 1, callback );
}
} );
}
function GetTagsCount()
{
let items = Object.keys( g_tagsCount ).map( function ( key )
{
return [key, g_tagsCount[key]];
} );
items = items.filter( function ( e ) { return e[0].split( '/' )[0] == "tag"; } );
return items.length;
}
function GetTags( callback )
{
LoadTagsInternal( 0, "", function ( tags )
{
callback( tags );
} );
}
function GetSuggestion()
{
return g_suggestedDoujinshi;
}
function GetDoujinshiDebug()
{
return g_doujinshiDebug;
}
*/