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{ Buffer } from 'node:buffer';\nimport { PNG } from 'npm:pngjs@7.0.0';\nimport { createWorker, PSM } from 'npm:tesseract.js@7.0.0';\nimport { detectChromaticComponents } from './visual_regions_v1.ts';\nimport { createCloudflareBrowserClientV3 as createV4 } from 'https://esm.town/v/mosadek/project-brain-cloudflare-adapter-v2@20-main/cloudflare_browser_client_v4_candidate.ts';\nconst accountId=Deno.env.get('CLOUDFLARE_ACCOUNT_ID')||'',apiToken=Deno.env.get('CLOUDFLARE_API_TOKEN')||'';if(!accountId||!apiToken)throw new Error('CF_CREDENTIALS_MISSING');\nconst sr=await fetch(`https://api.cloudflare.com/client/v4/accounts/${encodeURIComponent(accountId)}/subscriptions`,{headers:{Authorization:`Bearer ${apiToken}`}});const sj:any=await sr.json();const subscriptions=Array.isArray(sj?.result)?sj.result:[];if(!sr.ok||subscriptions.length!==0)throw new Error('ZERO_COST_GATE_FAILED');\nconst challenge_id='CANVAS-HI-1789506062251-89decfd0',host='mosadek--8b95191ab14811f1bbe51607ee4eb77e.web.val.run',target=`https://${host}/?challenge_id=${encodeURIComponent(challenge_id)}`;\nconst client=createV4({accountId,apiToken,allowedDomains:[host]});const worker=await createWorker('eng');\nfunction decode(base64:string){return PNG.sync.read(Buffer.from(base64,'base64')) as any}\nfunction crop(src:any,b:any,pad=8){const x1=Math.max(0,b.x1-pad),y1=Math.max(0,b.y1-pad),x2=Math.min(src.width-1,b.x2+pad),y2=Math.min(src.height-1,b.y2+pad),w=x2-x1+1,h=y2-y1+1,out=new PNG({width:w,height:h});for(let y=0;y30){n++;if(xx2)x2=x;if(y>y2)y2=y}}if(x2<0)return{text:'',changed_pixels:0,bbox:null};return{text:await ocrBuffer(crop(after,{x1,y1,x2,y2},24)),changed_pixels:n,bbox:{x1,y1,x2,y2}}}\nasync function regionsWithText(s:any){const png=decode(s.screenshot_base64);const regions=detectChromaticComponents(png,{minColorCount:800,minComponentPixels:800,minWidth:40,minHeight:30});const out:any[]=[];for(const z of regions.slice(0,12))out.push({...z,ocr:await ocrBuffer(crop(png,z))});return {png,regions:out}}\nconst ev:any={schema:'CANVAS_HIGH_INFORMATION_CANDIDATE_V2',challenge_id,route:'CLOUDFLARE_BROWSER_V4_COORDINATE_INPUT_PLUS_PIXEL_COMPONENTS_PLUS_TESSERACT_JS_7',zero_cost_gate:{subscriptions_count:subscriptions.length,passed:true},promotion_authorized:false};\nasync function startRateSafe(){try{return await client.start()}catch(e){if(!String((e as any)?.message??e).includes('CLOUDFLARE_API_429'))throw e;await new Promise(r=>setTimeout(r,21000));return await client.start()}}\nconst started=await startRateSafe();const sid=started.session_id;await client.setViewport(sid,1000,700);\ntry{\n let s:any=await client.navigate(sid,target);ev.initial_screenshot_sha256=s.screenshot_sha256;ev.initial_dom_interactive_count=Array.isArray(s.elements)?s.elements.length:null;if(ev.initial_dom_interactive_count!==0)throw new Error('CHALLENGE_NOT_NON_DOM');\n const initial=await regionsWithText(s);ev.initial_visual_regions=initial.regions.map(({screenshot_base64,...x}:any)=>x);const decoy=initial.regions.find((r:any)=>/FAST\\s*PATH/i.test(r.ocr));if(!decoy)throw new Error('FAST_PATH_REGION_NOT_VISUALLY_IDENTIFIED:'+JSON.stringify(initial.regions));const alternatives=initial.regions.filter((r:any)=>r!==decoy);if(alternatives.length!==1)throw new Error('BEGIN_REGION_NOT_UNAMBIGUOUS:'+JSON.stringify(initial.regions));const begin=alternatives[0];ev.decoy_region={...decoy};ev.begin_region={...begin};\n s=await client.clickAt(sid,decoy.cx,decoy.cy);await new Promise(r=>setTimeout(r,300));s=await client.snapshot(sid);const afterDecoyPng=decode(s.screenshot_base64);const deadDiff=await ocrVisualDiff(initial.png,afterDecoyPng);ev.dead_end_ocr_text=deadDiff.text;ev.dead_end_visual_diff={changed_pixels:deadDiff.changed_pixels,bbox:deadDiff.bbox};ev.dead_end_observed=/other\\s+rendered\\s+control/i.test(deadDiff.text)&&deadDiff.changed_pixels>0&&s.screenshot_sha256!==ev.initial_screenshot_sha256;console.log(JSON.stringify({schema:'CANVAS_CLICK_DIAGNOSTIC_V2',initial_sha:ev.initial_screenshot_sha256,after_decoy_sha:s.screenshot_sha256,decoy,begin,deadDiff},null,2));if(!ev.dead_end_observed)throw new Error('DEAD_END_VISUAL_PROOF_FAILED:'+deadDiff.text);\n s=await client.clickAt(sid,begin.cx,begin.cy);await new Promise(r=>setTimeout(r,300));s=await client.snapshot(sid);const tilePng=decode(s.screenshot_base64);const rawTiles=detectChromaticComponents(tilePng,{minColorCount:800,minComponentPixels:800,minWidth:40,minHeight:30});await worker.setParameters({tessedit_pageseg_mode:PSM.SINGLE_WORD,tessedit_char_whitelist:'0123456789'} as any);const tiles:any[]=[];const tileVisual:any[]=[];for(const r of rawTiles){const digit=await ocrBuffer(cropCenterDigits(tilePng,r));tileVisual.push({...r,ocr:digit});if(/^\\d{2}$/.test(digit))tiles.push({...r,value:Number(digit)})}await worker.setParameters({tessedit_pageseg_mode:PSM.AUTO,tessedit_char_whitelist:''} as any);ev.tile_visual_regions=tileVisual;if(tiles.length!==4)throw new Error('FOUR_TILE_VALUES_NOT_VISUALLY_IDENTIFIED:'+JSON.stringify(tileVisual));ev.observed_tile_values=tiles.map(t=>t.value);const ordered=[...tiles].sort((a,b)=>a.value-b.value);ev.click_order=ordered.map(t=>t.value);\n for(const t of ordered){s=await client.clickAt(sid,t.cx,t.cy);await new Promise(r=>setTimeout(r,120))}await new Promise(r=>setTimeout(r,500));s=await client.snapshot(sid);const finalText=await ocrFull(s);const finalPng=decode(s.screenshot_base64);await worker.setParameters({tessedit_pageseg_mode:PSM.SINGLE_LINE,tessedit_char_whitelist:'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789:-'} as any);const receiptBandText=await ocrBuffer(cropReceiptBand(finalPng));await worker.setParameters({tessedit_pageseg_mode:PSM.AUTO,tessedit_char_whitelist:''} as any);let edgeInk=0,rightmostInk=-1;for(let y=155;y<=225&&y=920)edgeInk++}}ev.final_ocr_text=finalText;ev.receipt_band_ocr_text=receiptBandText;ev.receipt_visual_edge_metrics={rightmost_dark_ink_x:rightmostInk,dark_ink_pixels_x920_to_938:edgeInk,screenshot_width:finalPng.width};const m=(receiptBandText+'\\n'+finalText).match(/PBC-[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}-[0-9a-f]{8}/i);ev.success=Boolean(m);ev.receipt=m?.[0]??'';ev.final_screenshot_sha256=s.screenshot_sha256;console.log(JSON.stringify({schema:'CANVAS_RECEIPT_EDGE_DIAGNOSTIC_V1',receiptBandText,finalText,metrics:ev.receipt_visual_edge_metrics},null,2));if(!ev.success)throw new Error('SUCCESS_RECEIPT_NOT_VISUALLY_IDENTIFIED:'+JSON.stringify({receiptBandText,finalText,metrics:ev.receipt_visual_edge_metrics}));console.log(JSON.stringify(ev,null,2));\n} 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