25 lines
1.7 KiB
JavaScript
25 lines
1.7 KiB
JavaScript
import {T} from './i18n.js';
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// Retry only freshly uploaded same-origin view URLs. Local files, data URLs and
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// restored inputs keep their original behavior. Each retry bypasses cached 404s.
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export async function loadImage(url,{retry=false,signal,timeoutMs=15000,delays=[300,900]}={}) {
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const parsed=new URL(url,location.href);
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const canRetry=retry && parsed.origin===location.origin && /\/view$/.test(parsed.pathname);
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const attempts=canRetry?delays.length+1:1;
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for(let i=0;i<attempts;i++){
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signal?.throwIfAborted();
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if(i){await new Promise((resolve,reject)=>{const timer=setTimeout(done,delays[i-1]);function done(){signal?.removeEventListener('abort',abort);resolve();}function abort(){clearTimeout(timer);reject(new DOMException('Aborted','AbortError'));}signal?.addEventListener('abort',abort,{once:true});});}
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const image=new Image();
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try{
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await new Promise((resolve,reject)=>{
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const finish=fn=>value=>{clearTimeout(timer);signal?.removeEventListener('abort',abort);image.onload=image.onerror=null;fn(value);};
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const success=finish(resolve),failure=finish(reject),abort=()=>{image.src='';failure(new DOMException('Aborted','AbortError'));};
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const timer=setTimeout(()=>failure(new Error(T('Cannot load image'))),timeoutMs);
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image.onload=success;image.onerror=()=>failure(new Error(T('Cannot load image')));signal?.addEventListener('abort',abort,{once:true});
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const request=new URL(parsed);if(i)request.searchParams.set('_adachi_retry',String(i));image.src=request.href;
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});
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return image;
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}catch(error){if(error.name==='AbortError'||i===attempts-1)throw error;}
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}
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}
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