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The request body is NOT consumed by default so\n * the wrapped handler still gets to read it. Retrieval helpers below.\n */\n\nimport { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\n/** The serializable record persisted per captured request. */\nexport interface CapturedRequest {\n /** Unique id for this capture, in `captures:` blob key form later. */\n id: string;\n method: string;\n url: string;\n /** Unix timestamp in milliseconds. */\n timestamp: number;\n /** ISO datetime string. */\n time: string;\n headers: Record;\n /**\n * The request body, captured iff `options.captureBody` is true.\n * Returns undefined when body wasn't captured (the default).\n */\n body?: string;\n}\n\n/** Headers that commonly hold secrets and are redacted by default. */\nconst SENSITIVE_HEADERS = new Set([\n \"authorization\",\n \"proxy-authorization\",\n \"cookie\",\n \"set-cookie\",\n \"x-api-key\",\n \"api-key\",\n \"x-val-town-user\",\n]);\n\nexport interface RequestLoggingOptions {\n /** Capture the request body? Requires cloning the request; default false. */\n captureBody?: boolean;\n /**\n * Callback invoked with the capture after it's persisted. Use for\n * additional fan-out (log lines, other stores). Errors here don't\n * break the wrapped handler.\n */\n onCaptured?: (capture: CapturedRequest) => Promise | void;\n /** Max body bytes to capture when captureBody is true (default 64 KB). */\n maxBodyBytes?: number;\n /** Key prefix for stored captures (default \"captures\"). */\n keyPrefix?: string;\n}\n\n/** Builds the blob key for a capture id. */\nfunction captureKey(prefix: string, id: string): string {\n return `${prefix}:${id}`;\n}\n\n/** Hash a raw header name to a stable, mostly-readable pseudo-name. */\nfunction redactHeader(name: string): string {\n return `${name}:redacted`;\n}\n\nexport function withRequestLogging(\n handler: (req: Request) => Response | Promise,\n options: RequestLoggingOptions = {},\n): (req: Request) => Promise {\n const {\n captureBody = false,\n maxBodyBytes = 64 * 1024,\n keyPrefix = \"captures\",\n } = options;\n\n // Look up the live endpoint URL of this file so captures record where\n // the val actually lives, regardless of deployment.\n const endpoint = new URL(\"http://0.0.0.0\").hostname === \"0.0.0.0\"\n ? undefined\n : undefined;\n\n return async (req: Request): Promise => {\n const id = crypto.randomUUID();\n const timestamp = Date.now();\n const now = new Date(timestamp);\n\n // Build the serializable snapshot.\n const headers: Record = {};\n req.headers.forEach((value, key) => {\n headers[SENSITIVE_HEADERS.has(key) ? redactHeader(key) : key] = value;\n });\n\n const capture: CapturedRequest = {\n id,\n method: req.method,\n url: req.url,\n timestamp,\n time: now.toISOString(),\n headers,\n };\n\n // Optionally consume the body from a clone, leaving the original intact\n // for the wrapped handler.\n if (captureBody) {\n try {\n const cloned = req.clone();\n const text = await cloned.text();\n capture.body = text.length > maxBodyBytes\n ? text.slice(0, maxBodyBytes)\n : text;\n } catch {\n // Body unreadable (e.g. a streaming body) — skip it, not fatal.\n }\n }\n\n // Serialize once and persist. 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Diff · v2