[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_106":107,"_108":109},"routes/embed.x.$handle.$name.$",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":-5},"handle","scott_mike","name","audio-url-inspector","path","inspector.ts","project",{"_22":45,"_11":12,"_33":46,"_47":-5,"_48":42,"_49":50,"_51":50,"_52":53,"_54":-5,"_55":56,"_57":58,"_59":32,"_60":-5,"_61":-5,"_62":63,"_64":65,"_66":67,"_68":69,"_70":71,"_72":-5,"_73":74,"_75":74,"_76":77,"_78":77,"_79":77,"_80":74,"_81":74,"_82":83,"_84":85,"_86":87,"_88":42},"file",{"_22":23,"_11":14,"_24":25,"_26":-5,"_27":28,"_29":30,"_31":32,"_33":34,"_35":36,"_37":38,"_39":40,"_41":42,"_43":-5,"_13":44},"permalink","https://www.val.town/x/scott_mike/audio-url-inspector/code/inspector.ts","extension","id","ead9bbca-507f-4ec4-a1cd-6279d5ae269f","fileId","7fcbc78e-abe7-11f1-9cb5-1607ee4eb77e","parentId","branchId","28a047d3-5295-4f5c-942b-0a5bf4f378ce","branchVersion",19,"latest",true,"createdAt",["D",1788915329299],"version",4,"fileType","script","content","import * as cheerio from \"npm:cheerio@1.0.0\";\nconst EXT = /\\.(mp3|m4a|wav|ogg|oga|opus|aac|flac|aiff)(?:$|[?#])/i;\nexport class InspectError extends Error {\n constructor(message: string, public status = 422) { super(message); }\n}\nexport function validate(raw: string) {\n let u: URL;\n try { u = new URL(raw); } catch { throw new InspectError(\"Enter a complete public http:// or https:// URL.\", 400); }\n if (![\"https:\", \"http:\"].includes(u.protocol) || u.username || u.password || (u.port && ![\"80\", \"443\"].includes(u.port))) throw new InspectError(\"Only public HTTP(S) URLs on standard ports are supported.\", 400);\n const h = u.hostname.toLowerCase().replace(/\\.$/, \"\");\n if (!h.includes(\".\") || h.includes(\":\") || /(^|\\.)(localhost|local|internal|test|invalid)$/.test(h)) throw new InspectError(\"Local and private network URLs are not supported.\", 400);\n if (/^\\d+\\.\\d+\\.\\d+\\.\\d+$/.test(h) && !publicV4(h)) throw new InspectError(\"Private IP addresses are not supported.\", 400);\n u.hash = \"\";\n return u;\n}\nfunction publicV4(ip: string) {\n const [a,b] = ip.split(\".\").map(Number);\n return !(a === 0 || a === 10 || a === 127 || a >= 224 || (a === 169 && b === 254) || (a === 172 && b >= 16 && b <= 31) || (a === 192 && (b === 168 || b === 0)) || (a === 100 && b >= 64 && b <= 127) || (a === 198 && (b === 18 || b === 19)));\n}\nexport async function safeFetch(raw: string, signal: AbortSignal, full = false) {\n let u = validate(raw);\n const redirects: string[] = [];\n for (let i=0; i<6; i++) {\n signal.throwIfAborted();\n // Validate DNS answers as well as literal hosts before each redirect hop.\n if (!/^\\d+\\.\\d+\\.\\d+\\.\\d+$/.test(u.hostname)) {\n const answers = await Promise.all([\"A\",\"AAAA\"].map(async type => {\n const res=await fetch(\"https://cloudflare-dns.com/dns-query?name=\"+encodeURIComponent(u.hostname)+\"&type=\"+type,{headers:{Accept:\"application/dns-json\"},signal});\n if(!res.ok)throw new InspectError(\"DNS lookup failed.\");\n const data=await res.json();\n return (data.Answer||[]).filter((a:any)=>a.type===1||a.type===28).map((a:any)=>a.data as string);\n }));\n const ips: string[] = answers.flat();\n if (!ips.length) throw new InspectError(\"Could not resolve the source hostname.\");\n if (ips.some(ip => ip.includes(\":\") ? !/^[23][0-9a-f]{3}:/i.test(ip) : !publicV4(ip))) throw new InspectError(\"Source resolves to a non-public network address.\",400);\n }\n const response = await fetch(u, { redirect:\"manual\", signal, headers: !full && EXT.test(u.href) ? {Range:\"bytes=0-65535\", Accept:\"*/*\"} : {Accept:\"*/*\"} });\n if ([301,302,303,307,308].includes(response.status)) {\n await response.body?.cancel();\n const location = response.headers.get(\"location\");\n if (!location) throw new InspectError(\"Source returned a redirect without a destination.\");\n u = validate(new URL(location,u).href); redirects.push(u.href); continue;\n }\n if (!response.ok) { await response.body?.cancel(); throw new InspectError(\"Source returned HTTP \"+response.status+\". It may block automated access.\"); }\n return {response, url:u.href, redirects};\n }\n throw new InspectError(\"Source exceeded the five-redirect limit.\");\n}\nasync function sample(response: Response, limit: number) {\n const reader = response.body?.getReader();\n if (!reader) return new Uint8Array();\n const chunks: Uint8Array[] = []; let total=0;\n try {\n while (total{}); }\n const data=new Uint8Array(total); let offset=0;\n for(const chunk of chunks) {data.set(chunk,offset);offset+=chunk.length;}\n return data;\n}\nfunction signature(data: Uint8Array) {\n const s = new TextDecoder(\"latin1\").decode(data.subarray(0,32));\n if(s.startsWith(\"RIFF\") && s.slice(8,12)===\"WAVE\") return \"WAV\";\n if(s.startsWith(\"fLaC\")) return \"FLAC\";\n if(s.startsWith(\"OggS\")) return \"Ogg\";\n if(s.startsWith(\"ID3\")) return \"MP3 (ID3)\";\n if(data[0]===255 && (data[1]&246)===240) return \"AAC\";\n if(data[0]===255 && (data[1]&224)===224) return \"MPEG audio\";\n if(s.slice(4,8)===\"ftyp\") return \"MP4/M4A container\";\n if(s.startsWith(\"FORM\") && /AIFF|AIFC/.test(s.slice(8,12))) return \"AIFF\";\n return null;\n}\nfunction wavMetadata(data: Uint8Array) {\n if(signature(data)!==\"WAV\") return null;\n const v=new DataView(data.buffer,data.byteOffset,data.byteLength); const decode=new TextDecoder();\n let channels: number|null=null, sampleRate: number|null=null, bitsPerSample: number|null=null, byteRate=0, dataBytes: number|null=null;\n for(let pos=12; pos+8<=data.length;) {\n const id=decode.decode(data.subarray(pos,pos+4)); const size=v.getUint32(pos+4,true);\n if(id===\"fmt \" && size>=16 && pos+24<=data.length) {\n channels=v.getUint16(pos+10,true); sampleRate=v.getUint32(pos+12,true);\n byteRate=v.getUint32(pos+16,true); bitsPerSample=v.getUint16(pos+22,true);\n }\n if(id===\"data\") {dataBytes=size; break;}\n pos+=8+size+(size%2);\n }\n return {channels,sampleRate,bitsPerSample,durationSeconds:byteRate && dataBytes!=null ? dataBytes/byteRate : null};\n}\nasync function inspectResource(raw: string, signal: AbortSignal) {\n const fetched=await safeFetch(raw,signal);\n const h=fetched.response.headers;\n const contentType=(h.get(\"content-type\")||\"\").split(\";\")[0].toLowerCase();\n const looksAudio=contentType.startsWith(\"audio/\") || EXT.test(fetched.url);\n const bytes=await sample(fetched.response,looksAudio?65536:1048576);\n const detected=signature(bytes);\n const textPrefix=new TextDecoder().decode(bytes.subarray(0,256)).trimStart();\n const isMarkup=/^(0 && !isMarkup && (contentType.startsWith(\"audio/\") || (!!detected && (!containerOnly || /\\.(m4a|oga|opus)(?:$|[?#])/i.test(fetched.url))));\n const totalMatch=h.get(\"content-range\")?.match(/\\/(\\d+)$/);\n const length=totalMatch?Number(totalMatch[1]):fetched.response.status===200 && h.get(\"content-length\")?Number(h.get(\"content-length\")):null;\n return {\n fetched, bytes, isAudio,\n metadata: {\n url:raw, resolvedUrl:fetched.url, httpStatus:fetched.response.status, contentType:contentType||null,\n sizeBytes:length, sizeSource:totalMatch?\"Content-Range\":length!=null?\"Content-Length\":null,\n format:detected || (contentType.startsWith(\"audio/\")?contentType:null),\n evidence:detected?\"file signature\":isAudio?\"audio Content-Type\":\"not verified as audio\",\n filename:new URL(fetched.url).pathname.split(\"/\").pop()||null,\n supportsRanges:fetched.response.status===206 || h.get(\"accept-ranges\")===\"bytes\",\n inspectedBytes:bytes.length, redirects:fetched.redirects,\n lastModified:h.get(\"last-modified\"), wav:wavMetadata(bytes),\n }\n };\n}\nfunction discover(text: string, base: string) {\n const $=cheerio.load(text,{xmlMode:/^\\s*<\\?xml|]|]/i.test(text)});\n const candidates: {url:string;source:string;label:string|null}[]=[];\n const feeds:string[]=[];\n let pageBase=base;\n try {const b=$(\"base[href]\").first().attr(\"href\");if(b)pageBase=new URL(b,base).href;} catch{}\n const add=(raw:string|undefined,source:string,label?:string)=>{\n if(!raw || candidates.length>=30)return;\n try {const url=validate(new URL(raw,pageBase).href).href;if(!candidates.some(c=>c.url===url))candidates.push({url,source,label:label?.slice(0,240)||null});}catch{}\n };\n $(\"audio[src], audio source[src], source[type^='audio/']\").each((_,e)=>add($(e).attr(\"src\"),\"audio/source tag\"));\n $(\"meta[property], meta[name]\").each((_,e)=>{\n const key=$(e).attr(\"property\")||$(e).attr(\"name\")||\"\";\n if(/^(og:audio(?::url|:secure_url)?|twitter:player:stream)$/.test(key)) add($(e).attr(\"content\"),key);\n });\n $(\"enclosure[url], link[rel='enclosure']\").each((_,e)=>{\n const raw=$(e).attr(\"url\")||$(e).attr(\"href\");if(($(e).attr(\"type\")||\"\").startsWith(\"audio/\")||EXT.test(raw||\"\"))add(raw,\"RSS enclosure\",$(e).parent().find(\"title\").first().text());\n });\n $(\"a[href], link[href]\").each((_,e)=>{\n const href=$(e).attr(\"href\")||\"\";\n if(EXT.test(href))add(href,\"audio link\",$(e).text().trim());\n if(e.tagName===\"link\" && /rss|atom/.test($(e).attr(\"type\")||\"\") && feeds.length<2)try{feeds.push(validate(new URL(href,pageBase).href).href);}catch{}\n });\n function walk(o: any, depth=0) {\n if(!o || typeof o!==\"object\" || depth>12)return;\n if(Array.isArray(o)){o.slice(0,100).forEach(x=>walk(x,depth+1));return;}\n for(const [key,value] of Object.entries(o)) {\n if(typeof value===\"string\" && ([\"contentUrl\",\"audio\",\"associatedMedia\"].includes(key) || ([\"url\",\"embedUrl\"].includes(key)&&EXT.test(value)))) add(value,\"JSON-LD\");\n else if(typeof value===\"object\")walk(value,depth+1);\n }\n }\n $(\"script[type='application/ld+json']\").each((_,e)=>{try{walk(JSON.parse($(e).text()));}catch{}});\n return {title:$(\"title\").first().text().trim().slice(0,300)||null,candidates,feeds};\n}\nexport async function inspect(raw: unknown) {\n if(typeof raw!==\"string\" || raw.length>4096) throw new InspectError(\"Provide a URL string of at most 4096 characters.\",400);\n const input=validate(raw.trim()).href, started=Date.now(), signal=AbortSignal.timeout(22000);\n const first=await inspectResource(input,signal);\n const limits={timeBudgetSeconds:22,maxPageBytes:1048576,maxAudioSampleBytes:65536,maxCandidatesInspected:5,maxFeeds:2};\n if(first.isAudio)return {ok:true,inputUrl:input,inputType:\"direct_audio\",page:null,audio:[{...first.metadata,discoveredBy:\"input URL\"}],candidates:[],warnings:[],limits,elapsedMs:Date.now()-started};\n if(!/text|html|xml|json/.test(first.metadata.contentType||\"\") && !new TextDecoder().decode(first.bytes.subarray(0,100)).trimStart().startsWith(\"<\")) throw new InspectError(\"The URL did not return recognizable audio or a webpage/feed.\");\n const page=discover(new TextDecoder().decode(first.bytes),first.fetched.url);\n const warnings:string[]=[];\n if(first.bytes.length>=1048576)warnings.push(\"Page inspection stopped at 1 MiB; links beyond that may be missed.\");\n let candidates=page.candidates;\n if(!candidates.length) for(const feed of page.feeds) {\n try {\n const f=await inspectResource(feed,signal);\n const found=discover(new TextDecoder().decode(f.bytes),f.fetched.url);\n candidates.push(...found.candidates.map(c=>({...c,source:\"linked feed: \"+c.source})));\n warnings.push(\"Audio candidates came from a linked podcast feed and may include other episodes.\");\n } catch(e) {warnings.push(\"Linked feed: \"+(e as Error).message);}\n }\n candidates=Array.from(new Map(candidates.map(c=>[c.url,c])).values()).slice(0,30);\n const audio:any[]=[]; const checked:any[]=[];\n for(const candidate of candidates.slice(0,5)) {\n try{\n const r=await inspectResource(candidate.url,signal);\n checked.push({...candidate,verified:r.isAudio,error:r.isAudio?null:\"Resource did not return audio.\"});\n if(r.isAudio)audio.push({...r.metadata,discoveredBy:candidate.source,label:candidate.label});\n }catch(e){checked.push({...candidate,verified:false,error:(e as Error).message});}\n }\n if(!audio.length)warnings.push(\"No accessible audio verified. JavaScript-only players, authenticated media, DRM and embedded platforms are not resolved by this POC.\");\n if(candidates.length>5)warnings.push(\"Only the first five audio candidates were inspected.\");\n return {ok:audio.length>0,inputUrl:input,inputType:\"webpage_or_feed\",page:{title:page.title,resolvedUrl:first.fetched.url,contentType:first.metadata.contentType,redirects:first.fetched.redirects},audio,candidates:checked,discoveredCandidateCount:candidates.length,warnings,limits,elapsedMs:Date.now()-started};\n}\n","deleted",false,"label",[14],"bdedbd3b-32ac-408c-b811-167ee9493295",["D",1788914491210],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Resolve audio from URLs and inspect metadata. 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