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/** formatDuration renders milliseconds; negative/non-finite means unmeasured. */
export function formatDuration(ms: number | null | undefined): string {
if (ms == null || !Number.isFinite(ms) || ms < 0) return "—";
if (ms < 1) return `${ms.toFixed(2)} ms`;
if (ms < 1000) return `${ms.toFixed(1)} ms`;
if (ms < 60_000) return `${(ms / 1000).toFixed(2)} s`;
return `${Math.floor(ms / 60_000)}m ${((ms % 60_000) / 1000).toFixed(1)}s`;
}
/** formatTimelineTooltip describes an exact range within a waterfall and,
* when available, its absolute wall-clock bounds. */
export function formatTimelineTooltip(
label: string,
offsetMs: number,
durationMs: number,
absoluteStartMs?: number | null,
): string {
const endOffsetMs = offsetMs + durationMs;
const lines = [
label,
`offset: +${offsetMs.toFixed(2)} ms → +${endOffsetMs.toFixed(2)} ms`,
`duration: ${durationMs.toFixed(2)} ms`,
];
Eif (absoluteStartMs != null && Number.isFinite(absoluteStartMs)) {
lines.push(`start: ${new Date(absoluteStartMs).toISOString()}`);
lines.push(`end: ${new Date(absoluteStartMs + durationMs).toISOString()}`);
}
return lines.join("\n");
}
/** formatTimelineCursor renders the waterfall crosshair position in seconds. */
export function formatTimelineCursor(offsetMs: number): string {
const decimals = offsetMs < 10 ? 4 : 3;
return `+${(Math.max(offsetMs, 0) / 1000).toFixed(decimals)} s`;
}
/** formatBytes renders byte counts; negative means unknown per HAR. */
export function formatBytes(n: number | null | undefined): string {
if (n == null || !Number.isFinite(n) || n < 0) return "—";
if (n < 1024) return `${n} B`;
const units = ["KiB", "MiB", "GiB", "TiB"];
let v = n;
let i = -1;
while (v >= 1024 && i < units.length - 1) {
v /= 1024;
i++;
}
return `${v.toFixed(1)} ${units[i]}`;
}
/** statusClass folds a status code into "0" / "1xx".."5xx". */
export function statusClass(status: number): string {
if (!Number.isFinite(status) || status <= 0) return "0";
return `${Math.floor(status / 100)}xx`;
}
/** statusTone maps a status to a CSS tone suffix. */
export function statusTone(status: number): string {
switch (statusClass(status)) {
case "2xx":
return "ok";
case "3xx":
return "redirect";
case "4xx":
return "client";
case "5xx":
return "server";
default:
return "net";
}
}
/** urlParts splits a URL into host and path+query, tolerating garbage. */
export function urlParts(raw: string): { host: string; path: string } {
try {
const u = new URL(raw);
return { host: u.host, path: `${u.pathname}${u.search}` || "/" };
} catch {
const m = /^[a-z+.-]+:\/\/([^/?#]*)([^#]*)/i.exec(raw);
Iif (m) return { host: m[1], path: m[2] || "/" };
return { host: raw, path: "" };
}
}
export type ContentKind = "json" | "xml" | "text" | "binary" | "empty";
export interface PrettyContent {
kind: ContentKind;
/** Display/copy text; binary content uses its original base64 representation. */
text?: string;
/** Full text used by copy when the display text is truncated. */
copyText?: string;
note?: string;
/** Validated raster MIME eligible for an explicit, local image preview. */
previewImageMime?: string;
/** Validated video MIME eligible for explicit local playback. */
previewVideoMime?: string;
}
const MAX_PRETTY_BYTES = 512 * 1024;
const MAX_IMAGE_PREVIEW_BYTES = 5 * 1024 * 1024;
const MAX_VIDEO_PREVIEW_BYTES = 20 * 1024 * 1024;
/** prettyBody renders response content / postData text for display. */
export function prettyBody(
mimeType: string | undefined,
text: string | undefined,
encoding: string | undefined,
formatted = true,
): PrettyContent {
if (!text) return { kind: "empty" };
if (encoding === "base64") {
const size = base64Size(text);
if (isTextualMime(mimeType)) {
const charset = mimeCharset(mimeType) ?? "utf-8";
try {
const bytes = decodeBase64(text);
const decoded = new TextDecoder(charset).decode(bytes);
const pretty = prettyBody(mimeType, decoded, undefined, formatted);
return {
...pretty,
note: `${pretty.note ? `${pretty.note} · ` : ""}${formatBytes(size)} decoded from HAR base64 as ${charset}`,
};
} catch {
// Unsupported charset or malformed third-party HAR: retain the raw
// base64 below so it remains visible and copyable.
}
}
return {
kind: "binary",
text,
note: `binary content, ${formatBytes(size)} (base64-encoded in the HAR)`,
previewImageMime: safeImageMime(mimeType, text, size),
previewVideoMime: safeVideoMime(mimeType, text, size),
};
}
const mt = (mimeType ?? "").toLowerCase();
let rendered = text;
let kind: ContentKind = "text";
if (mt.includes("json")) {
kind = "json";
if (formatted) {
try {
rendered = JSON.stringify(JSON.parse(text), null, 2);
} catch {
kind = "text";
}
}
} else if (mt.includes("xml") || text.trimStart().startsWith("<?xml")) {
kind = "xml";
if (formatted) rendered = prettyXml(text);
}
if (rendered.length > MAX_PRETTY_BYTES) {
return {
kind,
text: rendered.slice(0, MAX_PRETTY_BYTES),
copyText: rendered,
note: `showing first ${formatBytes(MAX_PRETTY_BYTES)} of ${formatBytes(rendered.length)}`,
};
}
return { kind, text: rendered };
}
function isTextualMime(mimeType: string | undefined): boolean {
const mt = (mimeType ?? "").split(";", 1)[0].trim().toLowerCase();
return (
mt.startsWith("text/") ||
mt.endsWith("+json") ||
mt.endsWith("+xml") ||
[
"application/json",
"application/xml",
"application/javascript",
"application/ecmascript",
"application/x-www-form-urlencoded",
"application/x-ndjson",
"application/xhtml+xml",
"image/svg+xml",
].includes(mt)
);
}
function mimeCharset(mimeType: string | undefined): string | undefined {
const match = /(?:^|;)\s*charset\s*=\s*(?:"([^"]+)"|([^;\s]+))/i.exec(mimeType ?? "");
return (match?.[1] ?? match?.[2])?.trim().toLowerCase();
}
export function decodeBase64(text: string): Uint8Array {
const raw = atob(text.replace(/\s/g, ""));
const bytes = new Uint8Array(raw.length);
for (let i = 0; i < raw.length; i++) bytes[i] = raw.charCodeAt(i);
return bytes;
}
/**
* Returns a raster MIME only when the declared type and file signature agree.
* SVG is deliberately excluded: previews must never introduce active content.
*/
function safeImageMime(mimeType: string | undefined, base64: string, size: number): string | undefined {
Iif (size <= 0 || size > MAX_IMAGE_PREVIEW_BYTES) return undefined;
const mt = (mimeType ?? "").split(";", 1)[0].trim().toLowerCase();
let bytes: Uint8Array;
try {
bytes = decodeBase64(base64);
} catch {
return undefined;
}
const ascii = (start: number, value: string) =>
bytes.length >= start + value.length && [...value].every((c, i) => bytes[start + i] === c.charCodeAt(0));
const signatures: Record<string, boolean> = {
"image/jpeg": bytes.length >= 3 && bytes[0] === 0xff && bytes[1] === 0xd8 && bytes[2] === 0xff,
"image/png":
bytes.length >= 8 &&
bytes[0] === 0x89 &&
ascii(1, "PNG") &&
bytes[4] === 0x0d &&
bytes[5] === 0x0a &&
bytes[6] === 0x1a &&
bytes[7] === 0x0a,
"image/gif": ascii(0, "GIF87a") || ascii(0, "GIF89a"),
"image/webp": ascii(0, "RIFF") && ascii(8, "WEBP"),
};
return signatures[mt] ? mt : undefined;
}
/** Returns a video MIME only when its declared type and container signature agree. */
function safeVideoMime(mimeType: string | undefined, base64: string, size: number): string | undefined {
Iif (size <= 0 || size > MAX_VIDEO_PREVIEW_BYTES) return undefined;
const mt = (mimeType ?? "").split(";", 1)[0].trim().toLowerCase();
let bytes: Uint8Array;
try {
bytes = decodeBase64(base64);
} catch {
return undefined;
}
const ascii = (start: number, value: string) =>
bytes.length >= start + value.length && [...value].every((c, i) => bytes[start + i] === c.charCodeAt(0));
const signatures: Record<string, boolean> = {
// ISO Base Media File Format: the first box is normally ftyp.
"video/mp4": bytes.length >= 12 && ascii(4, "ftyp"),
// EBML header used by WebM.
"video/webm":
bytes.length >= 4 && bytes[0] === 0x1a && bytes[1] === 0x45 && bytes[2] === 0xdf && bytes[3] === 0xa3,
};
return signatures[mt] ? mt : undefined;
}
export function prettyPostData(pd: PostData | undefined, encoding?: string, formatted = true): PrettyContent {
Iif (!pd) return { kind: "empty" };
return prettyBody(pd.mimeType, pd.text, encoding, formatted);
}
export function prettyContent(c: HarContent | undefined, formatted = true): PrettyContent {
Iif (!c) return { kind: "empty" };
return prettyBody(c.mimeType, c.text, c.encoding, formatted);
}
/** base64Size estimates the decoded byte size of a base64 string. */
export function base64Size(b64: string): number {
const padding = b64.endsWith("==") ? 2 : b64.endsWith("=") ? 1 : 0;
return Math.max(0, Math.floor((b64.length * 3) / 4) - padding);
}
/**
* prettyXml is a lightweight indenter: it never parses, only re-flows tag
* boundaries, so malformed XML degrades gracefully instead of throwing.
*/
export function prettyXml(xml: string): string {
const compact = xml.replace(/>\s+</g, "><").trim();
const parts = compact.replace(/></g, ">\u0000<").split("\u0000");
let depth = 0;
const out: string[] = [];
for (const part of parts) {
const isClosing = /^<\//.test(part);
const isSelfContained =
/\/>$/.test(part) ||
/^<[?!]/.test(part) ||
/^<([^\s>/]+)[^>]*>[^<]*<\/\1>$/.test(part);
if (isClosing) depth = Math.max(0, depth - 1);
out.push(" ".repeat(depth) + part);
if (!isClosing && !isSelfContained && /^<[^\s>/]/.test(part)) depth++;
}
return out.join("\n");
}
/** parseIsoMs parses an ISO timestamp, null on failure. */
export function parseIsoMs(s: string | undefined): number | null {
if (!s) return null;
const ms = Date.parse(s);
return Number.isFinite(ms) ? ms : null;
}
/** relMs formats an offset relative to a base timestamp. */
export function relMs(baseMs: number | null, ms: number | null): string {
if (baseMs == null || ms == null) return "—";
const d = ms - baseMs;
return `+${formatDuration(Math.max(0, d))}`;
}
/** shortId trims correlation ids for list display. */
export function shortId(id: string | null | undefined, n = 8): string {
if (!id) return "";
return id.length > n ? id.slice(0, n) : id;
}
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