DDoS shield

5f:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 60:T658b,"use client"; // DDoS shield, from Illos.dev (https://illos.dev/library/shader/ddos-shield). // One SVG, its field drawn live with WebGL by shader-runtime.ts beside this file: it plays once when it scrolls into view, holds its final frame, loops while hovered, and finishes its cycle when the pointer leaves. Without WebGL, or with reduced motion, the SVG's still shows. import { useEffect, useRef, type CSSProperties } from "react"; import { mountShader } from "./shader-runtime"; const SVG = ``; const LIVE = ""; export function IllosDdosShield({ className, style }: { className?: string; style?: CSSProperties }) { const ref = useRef(null); useEffect(() => { if (!ref.current) return undefined; const stopPlay = playOnce(ref.current); const stopField = mountShader(ref.current); return () => { stopField(); stopPlay(); }; }, []); return

; } /** Waits until half of it is in view, lets it play once, loops while hovered, and finishes its cycle when the pointer leaves. */ function playOnce(host: HTMLElement): () => void { if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return () => {}; let started = false; const animations = () => host.getAnimations({ subtree: true }); const play = () => { if (!started) { started = true; host.style.setProperty("--illos-play", "running"); return; } if (animations().some((a) => a.playState === "running")) return; for (const a of animations()) { a.currentTime = 0; // seek only: play() takes a CSS animation out of CSS control, and --illos-play: paused stops working } }; let wasOut = true; const io = new IntersectionObserver( (entries) => { const inView = entries.some((e) => e.isIntersecting); if (inView && wasOut) play(); wasOut = !inView; }, { threshold: 0.5 }, ); io.observe(host); const hover = window.matchMedia("(hover: hover) and (pointer: fine)").matches; let hovering = false; let waiting = false; const loop = () => { if (waiting) return; const list = animations(); if (!list.length) return; waiting = true; // Every step waits for a frame, so a run of instantly finished animations costs one restart per frame, never a spin. Promise.all(list.map((a) => a.finished)).then( () => requestAnimationFrame(() => { waiting = false; if (!hovering) return; // the pointer left: hold the final frame for (const a of animations()) { a.currentTime = 0; // seek only: play() takes a CSS animation out of CSS control, and --illos-play: paused stops working } loop(); }), () => requestAnimationFrame(() => { waiting = false; // an animation was cancelled: pick the loop back up while the pointer is still over it if (hovering) loop(); }), ); }; const onEnter = () => { hovering = true; play(); // starts it if it has not played; otherwise replays, never cutting into a running cycle loop(); }; const onLeave = () => { hovering = false; }; if (hover) { host.addEventListener("mouseenter", onEnter); host.addEventListener("mouseleave", onLeave); } return () => { hovering = false; io.disconnect(); if (hover) { host.removeEventListener("mouseenter", onEnter); host.removeEventListener("mouseleave", onLeave); } }; } 61:T406f,/** * The Shader style's runtime. A Shader SVG carries its field as GLSL in ; * mountShader draws that field on a canvas beneath the SVG in the bar look, taking its time from the SVG's clock * animation, so whatever plays, pauses, restarts or holds the SVG's CSS animations drives the field too. Erasable * TypeScript only: Node runs this file as is, and the site and the registry ship it as is. */ /** Helpers every field may use, and its one uniform, uT (seconds into the cycle). */ export const PRELUDE = `precision highp float; uniform float uT; const float TAU = 6.2831853; float hash(vec2 p) { return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453); } float blob(vec2 p, vec2 c, float r, float k) { vec2 d = p - c; return k * exp(-dot(d, d) / (r * r)); } float sm(float a, float b, float t) { return smoothstep(a, b, t); } float ease(float u) { u = clamp(u, 0.0, 1.0); return u < 0.5 ? 4.0 * u * u * u : 1.0 - pow(-2.0 * u + 2.0, 3.0) / 2.0; } float seg(vec2 p, vec2 a, vec2 b, float r, float k) { vec2 ab = b - a; float h = clamp(dot(p - a, ab) / dot(ab, ab), 0.0, 1.0); vec2 d = p - a - ab * h; return k * exp(-dot(d, d) / (r * r)); } float noise(vec2 p) { vec2 i = floor(p); vec2 f = fract(p); vec2 u = f * f * (3.0 - 2.0 * f); return mix(mix(hash(i), hash(i + vec2(1.0, 0.0)), u.x), mix(hash(i + vec2(0.0, 1.0)), hash(i + vec2(1.0, 1.0)), u.x), u.y); } `; /** * One value per bar cell (columns every 7 px from x = 4, cells on a 9.4 period), with the cell's grain. The field pass * and the still's sampler both use it, so the still is the live field's first frame. */ export const CELL = ` float cellValue(float col, float cell) { return field(vec2(4.0 + col * 7.0, cell * 9.4 + 3.5), uT) * (0.7 + 0.3 * hash(vec2(col, cell))); }`; /** The field pass: one pixel per cell into a COLS x CELLS texture, the value packed into red (coarse) and green (fine). */ export const FIELD_MAIN = ` void main() { float v = clamp(cellValue(floor(gl_FragCoord.x), floor(gl_FragCoord.y)) / 4.0, 0.0, 0.99999); gl_FragColor = vec4(floor(v * 255.0) / 255.0, fract(v * 255.0), 0.0, 1.0); }`; /** The canvas in cells for a frame of w x h: columns every 7 from x = 4 to w - 2, cells of 9.4 down h (720 x 460: 103 x 49). */ export const gridFor = (w: number, h: number): [number, number] => [Math.floor((w - 6) / 7) + 1, Math.ceil(h / 9.4)]; /** * The bar pass: per pixel, read its cell's value from the field pass and draw the bar look (ink and width by density, * screen lines, grid, sparks). Cheap per pixel; the field itself is worked out once per cell, not once per pixel. * As it is, it paints the ground too. With CLEAR defined (mountShader) the ground is left clear, so the page, a * gradient or a section edge, shows through: the look is painted over black and over white, and how much the two * differ is how much ground shows at that pixel. A light ink means a dark ground, where the grid and the screen lines * read louder, so there they draw at two thirds (grid) and a third (screen). */ export const BARS = `precision highp float; uniform vec2 uRes; uniform vec2 uGrid; uniform float uDpr; uniform vec3 uGround; uniform vec3 uInk; uniform sampler2D uField; uniform vec3 uR1; uniform vec3 uR2; uniform vec3 uR3; uniform vec3 uR4; uniform vec3 uSpark; float hash(vec2 p) { return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453); } vec3 paint(vec3 uGround, vec2 px, float v, float col, float cx, float cell) { vec3 color = uGround; float dark = step(0.5, uInk.g); if (mod(px.x, 96.0) < 1.0 || mod(px.y, 96.0) < 1.0) color = mix(uGround, uInk, mix(0.09, 0.06, dark)); float dx = abs(px.x - cx); color = mix(color, mix(uGround, uR4, mix(0.18, 0.06, dark)), 1.0 - smoothstep(0.3, 0.7, dx)); float w = 0.0; vec3 c = uR4; float a = 1.0; if (v >= 0.72) { w = 3.6; c = uR1; } else if (v >= 0.48) { w = 2.7; c = uR2; } else if (v >= 0.27) { w = 1.8; c = uR3; } else if (v >= 0.1) { w = 1.1; c = uR4; a = 0.55; } float bar = step(mod(px.y, 9.4), 7.0) * (1.0 - smoothstep(w * 0.5 - 0.35, w * 0.5 + 0.35, dx)) * step(0.001, w); color = mix(color, c, bar * a); if (w > 3.5 && hash(vec2(col, cell * 1.3)) > 0.55 && abs(mod(px.y, 9.4) - 3.0) < 0.8 && dx < 0.7) color = uSpark; return color; } void main() { vec2 px = vec2(gl_FragCoord.x, uRes.y * uDpr - gl_FragCoord.y) / uDpr; float col = floor((px.x - 4.0) / 7.0 + 0.5); float cx = 4.0 + col * 7.0; float cell = floor(px.y / 9.4); vec4 e = texture2D(uField, (vec2(col, cell) + 0.5) / uGrid); float v = (e.r + e.g / 255.0) * 4.0; if (col < 0.0 || col > uGrid.x - 1.0) v = 0.0; #ifdef CLEAR vec3 onBlack = paint(vec3(0.0), px, v, col, cx, cell); vec3 onWhite = paint(vec3(1.0), px, v, col, cx, cell); gl_FragColor = vec4(onBlack, clamp(1.0 - (onWhite.g - onBlack.g), 0.0, 1.0)); #else gl_FragColor = vec4(paint(uGround, px, v, col, cx, cell), 1.0); #endif }`; /** The gzipped size of this file in KB, quoted by the numbers line. A test keeps it true. */ export const RUNTIME_KB = 6.4; /** The field pass for a field: the prelude, T (the cycle in seconds, which a field may use), the field, one value per cell. */ export const fragmentFor = (field: string, cycle: number): string => `${PRELUDE}const float T = ${cycle.toFixed(3)};\n${field}\n${CELL}${FIELD_MAIN}`; /** The cycle and the field a Shader SVG carries, or null for any other SVG. */ export function readField(svg: Element): { cycle: number; field: string } | null { const meta = svg.querySelector("metadata.illos-field"); if (!meta) return null; const cycle = Number(meta.getAttribute("data-cycle")); const field = (meta.textContent ?? "").trim(); return cycle > 0 && /float\s+field\s*\(/.test(field) ? { cycle, field } : null; } const hex = (value: string, fallback: number[]): number[] => { const h = value.trim().replace("#", ""); const full = h.length === 3 ? h.replace(/./g, "$&$&") : h; return /^[0-9a-f]{6}$/i.test(full) ? [0, 2, 4].map((i) => parseInt(full.slice(i, i + 2), 16) / 255) : fallback; }; /** The light ramp and spark, used when the page sets no --illos-ramp-*. */ const RAMP = ["#16645a", "#1daf9c", "#3fdec9", "#c2f5ee"].map((c) => hex(c, [0, 0, 0])); const SPARK = hex("#0b463e", [0, 0, 0]); let probe: CanvasRenderingContext2D | null | undefined; const unread = new Set(); /** * Any CSS colour a role is set to (hex, rgb(), oklch(), a named colour) as sRGB from 0 to 1, read through a 1 px canvas. * A value the browser cannot read gives the fallback, with one console warning per value, never a silent white. */ function colour(value: string, fallback: number[]): number[] { const v = value.trim(); if (!v) return fallback; const quick = hex(v, []); if (quick.length) return quick; probe ??= document.createElement("canvas").getContext("2d", { willReadFrequently: true }); if (probe) { probe.fillStyle = "#010203"; probe.fillStyle = v; // a value the canvas cannot read leaves the marker if (probe.fillStyle !== "#010203") { probe.clearRect(0, 0, 1, 1); probe.fillRect(0, 0, 1, 1); const [r, g, b] = probe.getImageData(0, 0, 1, 1).data; return [r! / 255, g! / 255, b! / 255]; } } if (!unread.has(v)) { unread.add(v); console.warn(`Illos: the colour "${v}" could not be read, so the default is used.`); } return fallback; } /** * Draws the field of the Shader SVG inside `host` on a canvas beneath it, with a clear ground so the page shows * through, and marks the host `illos-live` (CSS then hides the still). Draws a frame whenever the clock's time changed; while the clock is not running it checks every * 250 ms, and an `illos:draw` event on the host draws at once (the preview renderer sends it after a seek). Does * nothing, and leaves the still, under reduced motion, without a GPU for WebGL, or if the field does not compile. Returns cleanup. */ export const SOFTWARE = /swiftshader|llvmpipe|softpipe|software|basic render/i; /** * A WebGL context only when a GPU draws it, else null. Drawn in software, a field holds the page's main thread every * frame, so the still stays instead. The flag catches a blocklisted GPU; the renderer's name catches a software * renderer that some browsers still hand out as WebGL. */ export function hardwareGl(canvas: HTMLCanvasElement, attributes: WebGLContextAttributes = {}): WebGLRenderingContext | null { // Asked once per page: on a software renderer each ask waits on the busy GPU process, and fields mount again and again. if (software) return null; const gl = canvas.getContext("webgl", { ...attributes, failIfMajorPerformanceCaveat: true }) as WebGLRenderingContext | null; if (software === undefined) { const info = gl?.getExtension("WEBGL_debug_renderer_info"); software = !gl || Boolean(info && SOFTWARE.test(String(gl.getParameter(info.UNMASKED_RENDERER_WEBGL)))); } if (!software) return gl; gl?.getExtension("WEBGL_lose_context")?.loseContext(); return null; } let software: boolean | undefined; export function mountShader(host: HTMLElement): () => void { const svg = host.querySelector("svg"); const spec = svg ? readField(svg) : null; if (!svg || !spec) return () => {}; if (window.matchMedia?.("(prefers-reduced-motion: reduce)").matches) return () => {}; const canvas = document.createElement("canvas"); const gl = hardwareGl(canvas, { antialias: false }); if (!gl) return () => {}; const shader = (type: number, src: string) => { const s = gl.createShader(type); if (!s) return null; gl.shaderSource(s, src); gl.compileShader(s); return gl.getShaderParameter(s, gl.COMPILE_STATUS) ? s : null; }; const vs = shader(gl.VERTEX_SHADER, "attribute vec2 p;void main(){gl_Position=vec4(p,0.,1.);}"); const link = (fs: WebGLShader | null) => { const prog = gl.createProgram(); if (!vs || !fs || !prog) return null; gl.attachShader(prog, vs); gl.attachShader(prog, fs); gl.bindAttribLocation(prog, 0, "p"); gl.linkProgram(prog); return gl.getProgramParameter(prog, gl.LINK_STATUS) ? prog : null; }; // The frame comes from the file's viewBox (a 640 x 720 portrait scene as well as the usual 720 x 460). const [vw, vh] = (svg.getAttribute("viewBox") ?? "").trim().split(/[\s,]+/).slice(2).map(Number); const [fw, fh] = vw! > 0 && vh! > 0 ? [vw!, vh!] : [720, 460]; const [COLS, CELLS] = gridFor(fw, fh); const fieldProg = link(shader(gl.FRAGMENT_SHADER, fragmentFor(spec.field, spec.cycle))); const barsProg = link(shader(gl.FRAGMENT_SHADER, `#define CLEAR\n${BARS}`)); if (!fieldProg || !barsProg) return () => {}; gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer()); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]), gl.STATIC_DRAW); gl.enableVertexAttribArray(0); gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); // The field pass draws into a small texture, one texel per cell; the bar pass reads it. const cells = gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, cells); gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, COLS, CELLS, 0, gl.RGBA, gl.UNSIGNED_BYTE, null); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE); const fbo = gl.createFramebuffer(); gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, cells, 0); gl.bindFramebuffer(gl.FRAMEBUFFER, null); const uT = gl.getUniformLocation(fieldProg, "uT"); const uRes = gl.getUniformLocation(barsProg, "uRes"); const uGrid = gl.getUniformLocation(barsProg, "uGrid"); const uDpr = gl.getUniformLocation(barsProg, "uDpr"); const uInk = gl.getUniformLocation(barsProg, "uInk"); const uRamp = [1, 2, 3, 4].map((i) => gl.getUniformLocation(barsProg, `uR${i}`)); const uSpark = gl.getUniformLocation(barsProg, "uSpark"); const uField = gl.getUniformLocation(barsProg, "uField"); canvas.className = "illos-field-canvas"; svg.parentNode?.insertBefore(canvas, svg); host.classList.add("illos-live"); const clock = svg.querySelector(".sh-clock"); let last = -1; let size = ""; let raf = 0; let timer = 0; let gone = false; // Layout and colours are read at most every half second: a read every frame would force style and layout each frame // while the labels animate. A resize or a theme switch shows within half a second. let measured = -Infinity; let w = 1; let h = 1; let ink = [0.165, 0.165, 0.165]; let ramp = RAMP; let spark = SPARK; const measure = () => { const box = svg.getBoundingClientRect(); // The canvas sits exactly where the drawing is: the SVG's viewBox fitted whole and centred in its box (the default // preserveAspectRatio), so the field and the lines over it stay together however the page sizes the SVG, even in a // box of another shape. const vb = svg.viewBox?.baseVal; const fit = vb && vb.width > 0 && vb.height > 0 ? Math.min(box.width / vb.width, box.height / vb.height) : 0; const dw = fit ? vb!.width * fit : box.width; const dh = fit ? vb!.height * fit : box.height; const hostBox = host.getBoundingClientRect(); Object.assign(canvas.style, { left: `${box.left - hostBox.left - host.clientLeft + (box.width - dw) / 2}px`, top: `${box.top - hostBox.top - host.clientTop + (box.height - dh) / 2}px`, width: `${dw}px`, height: `${dh}px`, }); const dpr = Math.min(2, window.devicePixelRatio || 1); w = Math.max(1, Math.round(dw * dpr)); h = Math.max(1, Math.round(dh * dpr)); const style = getComputedStyle(svg); // The page's role first, then the SVG's own fallback, which follows the system theme like the still does. const role = (r: string) => style.getPropertyValue(`--illos-${r}`).trim() || style.getPropertyValue(`--_${r}`); ink = colour(role("ink"), [0.165, 0.165, 0.165]); ramp = RAMP.map((fallback, i) => colour(role(`ramp-${i + 1}`), fallback)); spark = colour(role("spark"), SPARK); measured = Date.now(); }; const draw = () => { const anim = clock?.getAnimations?.()[0]; const t = (((Number(anim?.currentTime) || 0) / 1000) % spec.cycle + spec.cycle) % spec.cycle; if (Date.now() - measured > 500) measure(); const look = `${w}x${h} ${ink} ${ramp} ${spark}`; // a resize or a theme switch redraws even while the clock is held if (t !== last || look !== size) { if (canvas.width !== w || canvas.height !== h) { canvas.width = w; canvas.height = h; } size = look; gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); gl.viewport(0, 0, COLS, CELLS); gl.useProgram(fieldProg); gl.uniform1f(uT, t); gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); gl.bindFramebuffer(gl.FRAMEBUFFER, null); gl.viewport(0, 0, w, h); gl.useProgram(barsProg); gl.uniform2f(uRes, fw, fh); gl.uniform2f(uGrid, COLS, CELLS); gl.uniform1f(uDpr, w / fw); gl.uniform3fv(uInk, ink); ramp.forEach((c, i) => gl.uniform3fv(uRamp[i]!, c)); gl.uniform3fv(uSpark, spark); gl.bindTexture(gl.TEXTURE_2D, cells); gl.uniform1i(uField, 0); gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); last = t; } return anim?.playState === "running"; }; // After the clock stops (a cycle ended, or it paused), keep watching every frame for a while: a player restarts a // loop a frame later, and the field must follow at once. Then sleep, checking every 250 ms. let idle = 0; const tick = () => { raf = 0; timer = 0; if (gone) return; idle = draw() ? 0 : idle + 1; if (idle < 20) raf = requestAnimationFrame(tick); else timer = window.setTimeout(tick, 250); }; const now = () => { if (!gone) draw(); }; const stop = () => { if (gone) return; // a late context loss after cleanup must not touch a host another mount now owns gone = true; cancelAnimationFrame(raf); clearTimeout(timer); host.removeEventListener("illos:draw", now); canvas.remove(); host.classList.remove("illos-live"); gl.getExtension("WEBGL_lose_context")?.loseContext(); // free the context now: browsers cap how many are live }; canvas.addEventListener("webglcontextlost", stop); host.addEventListener("illos:draw", now); tick(); return stop; } 5e:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[null,["$","$L5f",null,{"files":[{"path":"illos/ddos-shield.tsx","content":"$60","type":"registry:component"},{"path":"illos/shader-runtime.ts","content":"$61","type":"registry:component"}],"className":"h-[70svh] min-h-80"}]]}]