{"version":3,"file":"tokens-C_Libgci.mjs","names":[],"sources":["../src/preview/tokens.ts"],"sourcesContent":["/**\n * Preview token generation and verification\n *\n * Tokens are compact, URL-safe, and HMAC-signed.\n * Format: base64url(JSON payload).base64url(HMAC signature)\n *\n * Payload: { cid: contentId, exp: expiryTimestamp, iat: issuedAt }\n */\n\nimport { encodeBase64url, decodeBase64url } from \"../utils/base64.js\";\n\n// Regex pattern for duration parsing\nconst DURATION_PATTERN = /^(\\d+)([smhdw])$/;\n\n/**\n * Preview token payload\n */\nexport interface PreviewTokenPayload {\n\t/** Content ID in format \"collection:id\" (e.g., \"posts:abc123\") */\n\tcid: string;\n\t/** Expiry timestamp (seconds since epoch) */\n\texp: number;\n\t/** Issued at timestamp (seconds since epoch) */\n\tiat: number;\n}\n\n/**\n * Options for generating a preview token\n */\nexport interface GeneratePreviewTokenOptions {\n\t/** Content ID in format \"collection:id\" */\n\tcontentId: string;\n\t/** How long the token is valid. Accepts \"1h\", \"30m\", \"1d\", or seconds as number. Default: \"1h\" */\n\texpiresIn?: string | number;\n\t/** Secret key for signing. Should be from environment variable. */\n\tsecret: string;\n}\n\n/**\n * Parse duration string to seconds\n * Supports: \"1h\", \"30m\", \"1d\", \"2w\", or raw seconds\n */\nfunction parseDuration(duration: string | number): number {\n\tif (typeof duration === \"number\") {\n\t\treturn duration;\n\t}\n\n\tconst match = duration.match(DURATION_PATTERN);\n\tif (!match) {\n\t\tthrow new Error(\n\t\t\t`Invalid duration format: \"${duration}\". Use \"1h\", \"30m\", \"1d\", \"2w\", or seconds.`,\n\t\t);\n\t}\n\n\tconst value = parseInt(match[1], 10);\n\tconst unit = match[2];\n\n\tswitch (unit) {\n\t\tcase \"s\":\n\t\t\treturn value;\n\t\tcase \"m\":\n\t\t\treturn value * 60;\n\t\tcase \"h\":\n\t\t\treturn value * 60 * 60;\n\t\tcase \"d\":\n\t\t\treturn value * 60 * 60 * 24;\n\t\tcase \"w\":\n\t\t\treturn value * 60 * 60 * 24 * 7;\n\t\tdefault:\n\t\t\tthrow new Error(`Unknown duration unit: ${unit}`);\n\t}\n}\n\n/**\n * Create HMAC-SHA256 signature using Web Crypto API\n */\nasync function createSignature(data: string, secret: string): Promise<Uint8Array> {\n\tconst encoder = new TextEncoder();\n\tconst key = await crypto.subtle.importKey(\n\t\t\"raw\",\n\t\tencoder.encode(secret),\n\t\t{ name: \"HMAC\", hash: \"SHA-256\" },\n\t\tfalse,\n\t\t[\"sign\"],\n\t);\n\tconst signature = await crypto.subtle.sign(\"HMAC\", key, encoder.encode(data));\n\treturn new Uint8Array(signature);\n}\n\n/**\n * Verify HMAC-SHA256 signature\n */\nasync function verifySignature(\n\tdata: string,\n\tsignature: Uint8Array,\n\tsecret: string,\n): Promise<boolean> {\n\tconst encoder = new TextEncoder();\n\tconst key = await crypto.subtle.importKey(\n\t\t\"raw\",\n\t\tencoder.encode(secret),\n\t\t{ name: \"HMAC\", hash: \"SHA-256\" },\n\t\tfalse,\n\t\t[\"verify\"],\n\t);\n\t// Create a new ArrayBuffer from the signature to satisfy BufferSource typing\n\t// (Uint8Array.buffer is ArrayBufferLike which includes SharedArrayBuffer)\n\tconst sigBuffer: ArrayBuffer = new ArrayBuffer(signature.byteLength);\n\tnew Uint8Array(sigBuffer).set(signature);\n\treturn crypto.subtle.verify(\"HMAC\", key, sigBuffer, encoder.encode(data));\n}\n\n/**\n * Generate a preview token for content\n *\n * @example\n * ```ts\n * const token = await generatePreviewToken({\n *   contentId: \"posts:abc123\",\n *   expiresIn: \"1h\",\n *   secret: process.env.PREVIEW_SECRET!,\n * });\n * ```\n */\nexport async function generatePreviewToken(options: GeneratePreviewTokenOptions): Promise<string> {\n\tconst { contentId, expiresIn = \"1h\", secret } = options;\n\n\tif (!secret) {\n\t\tthrow new Error(\"Preview secret is required\");\n\t}\n\n\tif (!contentId || !contentId.includes(\":\")) {\n\t\tthrow new Error('Content ID must be in format \"collection:id\"');\n\t}\n\n\tconst now = Math.floor(Date.now() / 1000);\n\tconst duration = parseDuration(expiresIn);\n\n\tconst payload: PreviewTokenPayload = {\n\t\tcid: contentId,\n\t\texp: now + duration,\n\t\tiat: now,\n\t};\n\n\t// Encode payload\n\tconst payloadJson = JSON.stringify(payload);\n\tconst encodedPayload = encodeBase64url(new TextEncoder().encode(payloadJson));\n\n\t// Sign it\n\tconst signature = await createSignature(encodedPayload, secret);\n\tconst encodedSignature = encodeBase64url(signature);\n\n\treturn `${encodedPayload}.${encodedSignature}`;\n}\n\n/**\n * Result of verifying a preview token\n */\nexport type VerifyPreviewTokenResult =\n\t| { valid: true; payload: PreviewTokenPayload }\n\t| { valid: false; error: \"invalid\" | \"expired\" | \"malformed\" | \"none\" };\n\n/**\n * Options for verifyPreviewToken\n */\nexport type VerifyPreviewTokenOptions = {\n\t/** Secret key for verifying tokens */\n\tsecret: string;\n} & (\n\t| { /** URL to extract _preview token from */ url: URL }\n\t| {\n\t\t\t/** Preview token string (can be null) */ token: string | null | undefined;\n\t  }\n);\n\n/**\n * Verify a preview token and return the payload\n *\n * @example\n * ```ts\n * // With URL (extracts _preview query param)\n * const result = await verifyPreviewToken({\n *   url: Astro.url,\n *   secret: import.meta.env.PREVIEW_SECRET,\n * });\n *\n * // With token directly\n * const result = await verifyPreviewToken({\n *   token: someToken,\n *   secret: import.meta.env.PREVIEW_SECRET,\n * });\n *\n * if (result.valid) {\n *   console.log(result.payload.cid); // \"posts:abc123\"\n * }\n * ```\n */\nexport async function verifyPreviewToken(\n\toptions: VerifyPreviewTokenOptions,\n): Promise<VerifyPreviewTokenResult> {\n\tconst { secret } = options;\n\n\tif (!secret) {\n\t\tthrow new Error(\"Preview secret is required\");\n\t}\n\n\t// Extract token from URL or use provided token\n\tconst token = \"url\" in options ? options.url.searchParams.get(\"_preview\") : options.token;\n\n\t// Handle null/undefined token\n\tif (!token) {\n\t\treturn { valid: false, error: \"none\" };\n\t}\n\n\t// Split token into payload and signature\n\tconst parts = token.split(\".\");\n\tif (parts.length !== 2) {\n\t\treturn { valid: false, error: \"malformed\" };\n\t}\n\n\tconst [encodedPayload, encodedSignature] = parts;\n\n\t// Verify signature\n\tlet signature: Uint8Array;\n\ttry {\n\t\tsignature = decodeBase64url(encodedSignature);\n\t} catch {\n\t\treturn { valid: false, error: \"malformed\" };\n\t}\n\n\tconst isValid = await verifySignature(encodedPayload, signature, secret);\n\tif (!isValid) {\n\t\treturn { valid: false, error: \"invalid\" };\n\t}\n\n\t// Decode and parse payload\n\tlet payload: PreviewTokenPayload;\n\ttry {\n\t\tconst payloadBytes = decodeBase64url(encodedPayload);\n\t\tconst payloadJson = new TextDecoder().decode(payloadBytes);\n\t\tpayload = JSON.parse(payloadJson);\n\t} catch {\n\t\treturn { valid: false, error: \"malformed\" };\n\t}\n\n\t// Check required fields\n\tif (\n\t\ttypeof payload.cid !== \"string\" ||\n\t\ttypeof payload.exp !== \"number\" ||\n\t\ttypeof payload.iat !== \"number\"\n\t) {\n\t\treturn { valid: false, error: \"malformed\" };\n\t}\n\n\t// Check expiry\n\tconst now = Math.floor(Date.now() / 1000);\n\tif (payload.exp < now) {\n\t\treturn { valid: false, error: \"expired\" };\n\t}\n\n\treturn { valid: true, payload };\n}\n\n/**\n * Parse a content ID into collection and id\n */\nexport function parseContentId(contentId: string): {\n\tcollection: string;\n\tid: string;\n} {\n\tconst colonIndex = contentId.indexOf(\":\");\n\tif (colonIndex === -1) {\n\t\tthrow new Error('Content ID must be in format \"collection:id\"');\n\t}\n\treturn {\n\t\tcollection: contentId.slice(0, colonIndex),\n\t\tid: contentId.slice(colonIndex + 1),\n\t};\n}\n"],"mappings":";;;;;;;;;;;AAYA,MAAM,mBAAmB;;;;;AA8BzB,SAAS,cAAc,UAAmC;AACzD,KAAI,OAAO,aAAa,SACvB,QAAO;CAGR,MAAM,QAAQ,SAAS,MAAM,iBAAiB;AAC9C,KAAI,CAAC,MACJ,OAAM,IAAI,MACT,6BAA6B,SAAS,6CACtC;CAGF,MAAM,QAAQ,SAAS,MAAM,IAAI,GAAG;CACpC,MAAM,OAAO,MAAM;AAEnB,SAAQ,MAAR;EACC,KAAK,IACJ,QAAO;EACR,KAAK,IACJ,QAAO,QAAQ;EAChB,KAAK,IACJ,QAAO,QAAQ,KAAK;EACrB,KAAK,IACJ,QAAO,QAAQ,KAAK,KAAK;EAC1B,KAAK,IACJ,QAAO,QAAQ,KAAK,KAAK,KAAK;EAC/B,QACC,OAAM,IAAI,MAAM,0BAA0B,OAAO;;;;;;AAOpD,eAAe,gBAAgB,MAAc,QAAqC;CACjF,MAAM,UAAU,IAAI,aAAa;CACjC,MAAM,MAAM,MAAM,OAAO,OAAO,UAC/B,OACA,QAAQ,OAAO,OAAO,EACtB;EAAE,MAAM;EAAQ,MAAM;EAAW,EACjC,OACA,CAAC,OAAO,CACR;CACD,MAAM,YAAY,MAAM,OAAO,OAAO,KAAK,QAAQ,KAAK,QAAQ,OAAO,KAAK,CAAC;AAC7E,QAAO,IAAI,WAAW,UAAU;;;;;AAMjC,eAAe,gBACd,MACA,WACA,QACmB;CACnB,MAAM,UAAU,IAAI,aAAa;CACjC,MAAM,MAAM,MAAM,OAAO,OAAO,UAC/B,OACA,QAAQ,OAAO,OAAO,EACtB;EAAE,MAAM;EAAQ,MAAM;EAAW,EACjC,OACA,CAAC,SAAS,CACV;CAGD,MAAM,YAAyB,IAAI,YAAY,UAAU,WAAW;AACpE,KAAI,WAAW,UAAU,CAAC,IAAI,UAAU;AACxC,QAAO,OAAO,OAAO,OAAO,QAAQ,KAAK,WAAW,QAAQ,OAAO,KAAK,CAAC;;;;;;;;;;;;;;AAe1E,eAAsB,qBAAqB,SAAuD;CACjG,MAAM,EAAE,WAAW,YAAY,MAAM,WAAW;AAEhD,KAAI,CAAC,OACJ,OAAM,IAAI,MAAM,6BAA6B;AAG9C,KAAI,CAAC,aAAa,CAAC,UAAU,SAAS,IAAI,CACzC,OAAM,IAAI,MAAM,iDAA+C;CAGhE,MAAM,MAAM,KAAK,MAAM,KAAK,KAAK,GAAG,IAAK;CAGzC,MAAM,UAA+B;EACpC,KAAK;EACL,KAAK,MAJW,cAAc,UAAU;EAKxC,KAAK;EACL;CAGD,MAAM,cAAc,KAAK,UAAU,QAAQ;CAC3C,MAAM,iBAAiB,gBAAgB,IAAI,aAAa,CAAC,OAAO,YAAY,CAAC;AAM7E,QAAO,GAAG,eAAe,GAFA,gBADP,MAAM,gBAAgB,gBAAgB,OAAO,CACZ;;;;;;;;;;;;;;;;;;;;;;;;AA+CpD,eAAsB,mBACrB,SACoC;CACpC,MAAM,EAAE,WAAW;AAEnB,KAAI,CAAC,OACJ,OAAM,IAAI,MAAM,6BAA6B;CAI9C,MAAM,QAAQ,SAAS,UAAU,QAAQ,IAAI,aAAa,IAAI,WAAW,GAAG,QAAQ;AAGpF,KAAI,CAAC,MACJ,QAAO;EAAE,OAAO;EAAO,OAAO;EAAQ;CAIvC,MAAM,QAAQ,MAAM,MAAM,IAAI;AAC9B,KAAI,MAAM,WAAW,EACpB,QAAO;EAAE,OAAO;EAAO,OAAO;EAAa;CAG5C,MAAM,CAAC,gBAAgB,oBAAoB;CAG3C,IAAI;AACJ,KAAI;AACH,cAAY,gBAAgB,iBAAiB;SACtC;AACP,SAAO;GAAE,OAAO;GAAO,OAAO;GAAa;;AAI5C,KAAI,CADY,MAAM,gBAAgB,gBAAgB,WAAW,OAAO,CAEvE,QAAO;EAAE,OAAO;EAAO,OAAO;EAAW;CAI1C,IAAI;AACJ,KAAI;EACH,MAAM,eAAe,gBAAgB,eAAe;EACpD,MAAM,cAAc,IAAI,aAAa,CAAC,OAAO,aAAa;AAC1D,YAAU,KAAK,MAAM,YAAY;SAC1B;AACP,SAAO;GAAE,OAAO;GAAO,OAAO;GAAa;;AAI5C,KACC,OAAO,QAAQ,QAAQ,YACvB,OAAO,QAAQ,QAAQ,YACvB,OAAO,QAAQ,QAAQ,SAEvB,QAAO;EAAE,OAAO;EAAO,OAAO;EAAa;CAI5C,MAAM,MAAM,KAAK,MAAM,KAAK,KAAK,GAAG,IAAK;AACzC,KAAI,QAAQ,MAAM,IACjB,QAAO;EAAE,OAAO;EAAO,OAAO;EAAW;AAG1C,QAAO;EAAE,OAAO;EAAM;EAAS;;;;;AAMhC,SAAgB,eAAe,WAG7B;CACD,MAAM,aAAa,UAAU,QAAQ,IAAI;AACzC,KAAI,eAAe,GAClB,OAAM,IAAI,MAAM,iDAA+C;AAEhE,QAAO;EACN,YAAY,UAAU,MAAM,GAAG,WAAW;EAC1C,IAAI,UAAU,MAAM,aAAa,EAAE;EACnC"}