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DOH_PROVIDERS = {\n cloudflare: \"https://cloudflare-dns.com/dns-query\",\n google: \"https://dns.google/resolve\",\n quad9: \"https://dns.quad9.net:5053/dns-query\",\n};\n\nasync function resolveDoH(\n hostname: string,\n provider: string = \"cloudflare\",\n): Promise {\n const endpoint = DOH_PROVIDERS[provider as keyof typeof DOH_PROVIDERS] ||\n DOH_PROVIDERS.cloudflare;\n\n try {\n const params = new URLSearchParams({\n name: hostname,\n type: \"A\",\n cd: \"false\",\n });\n\n const response = await fetch(`${endpoint}?${params}`, {\n headers: {\n Accept: \"application/dns-json\",\n },\n });\n\n if (!response.ok) {\n return null;\n }\n\n const data = await response.json();\n\n if (data.Answer && data.Answer.length > 0) {\n for (const answer of data.Answer) {\n if (answer.type === 1) {\n return answer.data;\n }\n }\n }\n return null;\n } catch {\n return null;\n }\n}\n\nexport default async function (req: Request): Promise {\n const url = new URL(req.url);\n const path = url.pathname;\n\n if (path === \"/dns\") {\n const hostname = url.searchParams.get(\"name\");\n const provider = url.searchParams.get(\"provider\") || \"cloudflare\";\n\n if (!hostname) {\n return new Response(\n JSON.stringify({ error: \"Missing hostname parameter\" }),\n {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n\n const ip = await resolveDoH(hostname, provider);\n return new Response(\n JSON.stringify({ hostname, ip, provider, resolved: !!ip }),\n {\n status: 200,\n headers: {\n \"Content-Type\": \"application/json\",\n \"Access-Control-Allow-Origin\": \"*\",\n },\n },\n );\n }\n\n if (path === \"/providers\") {\n return new Response(JSON.stringify(Object.keys(DOH_PROVIDERS)), {\n status: 200,\n headers: {\n \"Content-Type\": \"application/json\",\n \"Access-Control-Allow-Origin\": \"*\",\n },\n });\n }\n\n const targetUrl = url.searchParams.get(\"url\");\n const dohEnabled = url.searchParams.get(\"doh\") === \"true\";\n const dohProvider = url.searchParams.get(\"dohProvider\") || \"cloudflare\";\n\n if (!targetUrl) {\n return new Response(JSON.stringify({ error: \"Missing url parameter\" }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n try {\n const target = new URL(targetUrl);\n if (![\"http:\", \"https:\"].includes(target.protocol)) {\n return new Response(JSON.stringify({ error: \"Invalid protocol\" }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n const response = await fetch(targetUrl, {\n headers: {\n \"User-Agent\":\n \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36\",\n Accept:\n \"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\",\n \"Accept-Language\": \"en-US,en;q=0.5\",\n },\n redirect: \"manual\",\n });\n\n if ([301, 302, 303, 307, 308].includes(response.status)) {\n const location = response.headers.get(\"location\");\n if (location) {\n let redirectUrl = location;\n try {\n redirectUrl = new URL(location, targetUrl).href;\n } catch {}\n const isAbsoluteRedirect = location.startsWith(\"http://\") ||\n location.startsWith(\"https://\");\n return new Response(\n JSON.stringify({\n redirect: isAbsoluteRedirect ? redirectUrl : null,\n proxiedUrl: redirectUrl,\n type: \"redirect\",\n }),\n {\n status: 200,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n }\n\n const contentType = response.headers.get(\"content-type\") || \"\";\n\n if (!contentType.includes(\"text/html\")) {\n return new Response(JSON.stringify({ redirect: url }), {\n status: 200,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n let html = await response.text();\n\n const proxyScripts = ``;\n\n html = html.replace(\n /]*http-equiv=[\"']X-Frame-Options[\"'][^>]*>/gi,\n \"\",\n );\n html = html.replace(\n /]*http-equiv=[\"']Content-Security-Policy[\"'][^>]*>/gi,\n \"\",\n );\n\n if (/]*>/i.test(html)) {\n html = html.replace(\n /(]*>)/i,\n `$1${proxyScripts}`,\n );\n } else {\n html = `${proxyScripts}` +\n html;\n }\n\n const rewriteUrl = (u: string) => {\n try {\n if (\n !u || u.startsWith(\"data:\") || u.startsWith(\"blob:\") ||\n u.startsWith(\"javascript:\") || u.startsWith(\"mailto:\") ||\n u.startsWith(\"#\") || u.startsWith(\"//\")\n ) {\n return u;\n }\n return new URL(u, target.href).href;\n } catch {\n return u;\n }\n };\n\n html = html.replace(\n /(src|href)=[\"']((?![a-z]+:|\\/|https?:\\/\\/|data:|blob:|#)([^\"']*))[\"']/gi,\n (match: string, attr: string, path: string) =>\n `${attr}=\"${rewriteUrl(path)}\"`,\n );\n html = html.replace(\n /srcset=[\"']([^\"']*)[ \"']/gi,\n (match: string, srcset: string) => {\n const rewritten = srcset.split(\",\").map((s) => {\n const parts = s.trim().split(/\\s+/);\n if (parts.length >= 1) parts[0] = rewriteUrl(parts[0]);\n return parts.join(\" \");\n }).join(\", \");\n return `srcset=\"${rewritten}\"`;\n },\n );\n\n return new Response(html, {\n status: 200,\n headers: {\n \"Content-Type\": \"text/html; charset=utf-8\",\n \"Access-Control-Allow-Origin\": \"*\",\n \"X-Frame-Options\": \"ALLOWALL\",\n \"Cache-Control\": \"no-cache\",\n },\n });\n } catch (error) {\n return new Response(\n JSON.stringify({\n error: \"Failed to fetch URL\",\n details: (error as Error).message,\n }),\n {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n}","deleted","label",[102],"permalink","https://www.val.town/x/laxmiang/hello/code/proxy.val.ts","extension","actionData","errors"]