1import { useEffect, useRef, useState, type ReactNode } from "react";
2import { Icon } from "@iconify/react";
3
4const tok =
5 (color: string) =>
6 ({ children }: { children: ReactNode }) => (
7 <span style={{ color }}>{children}</span>
8 );
9const K = tok("var(--alc-code-keyword)");
10const S = tok("var(--alc-code-string)");
11const F = tok("var(--alc-code-fn)");
12const T = tok("var(--alc-code-type)");
13const V = tok("var(--alc-code-var)");
14const C = ({ children }: { children: ReactNode }) => (
15 <span style={{ color: "var(--alc-code-comment)", fontStyle: "italic" }}>
16 {children}
17 </span>
18);
19
20interface BindRow {
21 id: string;
22 call: ReactNode;
23 resource: {
24 label: string;
25 sub: string;
26 kind: "s3" | "ddb" | "ddb-stream" | "sqs";
27 };
28 arrow: { kind: "iam" | "stream"; label: string };
29}
30
31const ROWS: BindRow[] = [
32 {
33 id: "get",
34 call: (
35 <>
36 <K>const</K> getPhoto = <K>yield</K>* <V>S3</V>.<V>GetObject</V>.
37 <F>bind</F>(<T>Photos</T>);
38 </>
39 ),
40 resource: { label: "Photos", sub: "S3.Bucket", kind: "s3" },
41 arrow: { kind: "iam", label: "Allow s3:GetObject" },
42 },
43 {
44 id: "put",
45 call: (
46 <>
47 <K>const</K> putJob = <K>yield</K>* <V>DynamoDB</V>.<V>PutItem</V>.
48 <F>bind</F>(<T>Jobs</T>);
49 </>
50 ),
51 resource: { label: "Jobs", sub: "DynamoDB.Table", kind: "ddb" },
52 arrow: { kind: "iam", label: "Allow dynamodb:PutItem" },
53 },
54 {
55 id: "stream",
56 call: (
57 <>
58 <K>yield</K>* <V>DynamoDB</V>.<F>stream</F>(<T>Jobs</T>).<F>process</F>
59 (handler);
60 </>
61 ),
62 resource: {
63 label: "Jobs.stream",
64 sub: "EventSourceMapping",
65 kind: "ddb-stream",
66 },
67 arrow: { kind: "stream", label: "EventSource" },
68 },
69];
70
71function ResourceIcon({ kind }: { kind: BindRow["resource"]["kind"] }) {
72 const icon =
73 kind === "s3"
74 ? "logos:aws-s3"
75 : kind === "ddb"
76 ? "logos:aws-dynamodb"
77 : kind === "ddb-stream"
78 ? "logos:aws-lambda"
79 : "logos:aws-sqs";
80 return (
81 <div
82 style={{
83 width: 28,
84 height: 28,
85 borderRadius: 6,
86 overflow: "hidden",
87 display: "inline-flex",
88 alignItems: "center",
89 justifyContent: "center",
90 flexShrink: 0,
91 }}
92 >
93 <Icon icon={icon} width={28} height={28} aria-hidden />
94 </div>
95 );
96}
97
98export default function BindingsToIAM() {
99 const wrapRef = useRef<HTMLDivElement>(null);
100 const [active, setActive] = useState(-1);
101
102 useEffect(() => {
103 const reduced = window.matchMedia(
104 "(prefers-reduced-motion: reduce)",
105 ).matches;
106 let timer: ReturnType<typeof setTimeout> | null = null;
107 let cancelled = false;
108
109 const cycle = (i: number) => {
110 if (cancelled) return;
111 setActive(i);
112 if (reduced) {
113 setActive(ROWS.length - 1);
114 return;
115 }
116 const next = (i + 1) % (ROWS.length + 1); // +1 = "all visible" pause frame
117 const dwell = i === ROWS.length - 1 ? 2200 : 1300;
118 timer = setTimeout(() => cycle(next === ROWS.length ? -1 : next), dwell);
119 };
120
121 const obs = new IntersectionObserver(
122 (entries) => {
123 for (const e of entries) {
124 if (e.isIntersecting) {
125 cycle(0);
126 obs.disconnect();
127 }
128 }
129 },
130 { threshold: 0.2 },
131 );
132 if (wrapRef.current) obs.observe(wrapRef.current);
133 return () => {
134 cancelled = true;
135 if (timer) clearTimeout(timer);
136 obs.disconnect();
137 };
138 }, []);
139
140 return (
141 <div ref={wrapRef} className="bindings-iam" data-nosnippet="">
142 {/* LEFT — Lambda code */}
143 <div className="alc-code-block bindings-iam__code">
144 <div className="alc-code-block__header">
145 <span
146 className="alc-code-block__dot"
147 style={{ background: "var(--alc-danger)" }}
148 />
149 <span
150 className="alc-code-block__dot"
151 style={{ background: "var(--alc-warn)" }}
152 />
153 <span
154 className="alc-code-block__dot"
155 style={{ background: "var(--alc-accent-bright)" }}
156 />
157 <span className="alc-code-block__filename">src/JobApi.ts</span>
158 </div>
159 <pre className="alc-code-block__pre">
160 <K>export default</K> <V>AWS</V>.<V>Lambda</V>.<F>Function</F>
161 {"("}
162 {"\n "}
163 <S>"JobApi"</S>,{"\n "}
164 <V>Effect</V>.<F>gen</F>(<K>function</K>* () {"{"}
165 {"\n "}
166 {ROWS.map((r, i) => (
167 <span key={r.id}>
168 <span
169 data-row={r.id}
170 className="bindings-iam__bind"
171 style={{
172 padding: "1px 5px",
173 margin: "0 -5px",
174 borderRadius: 4,
175 background:
176 active === i ? "rgba(74, 110, 60, 0.22)" : "transparent",
177 boxShadow:
178 active === i ? "0 0 0 1px rgba(74, 110, 60, 0.55)" : "none",
179 transition: "background 280ms ease, box-shadow 280ms ease",
180 }}
181 >
182 {r.call}
183 </span>
184 {"\n "}
185 </span>
186 ))}
187 {"\n "}
188 <K>return</K> {"{"}
189 {"\n "}
190 <V>fetch</V>: (<V>req</V>) {"=>"} <V>Effect</V>.<F>gen</F>(
191 <K>function</K>* () {"{"}
192 {"\n "}
193 <K>const</K> photo = <K>yield</K>* <F>getPhoto</F>({"{ "}
194 <V>key</V>: <V>req</V>.<V>key</V> {"}"});
195 {"\n "}
196 <K>yield</K>* <F>putJob</F>({"{ "}
197 <V>id</V>: <V>req</V>.<V>id</V>, <V>photo</V> {"}"});
198 {"\n "}
199 <K>return</K> <K>new</K> <T>Response</T>(<S>"ok"</S>);
200 {"\n "}
201 {"}),"}
202 {"\n "}
203 {"};"}
204 {"\n "}
205 {"}),"}
206 {"\n"}
207 {");"}
208 </pre>
209 </div>
210
211 {/* MIDDLE — Animated arrows + labels */}
212 <div className="bindings-iam__arrows" aria-hidden>
213 <svg viewBox="0 0 200 280" preserveAspectRatio="none">
214 <defs>
215 <marker
216 id="bia-arrow-active"
217 viewBox="0 0 8 8"
218 refX="7"
219 refY="4"
220 markerWidth="6"
221 markerHeight="6"
222 orient="auto"
223 >
224 <path d="M0 0 L8 4 L0 8 Z" fill="var(--alc-accent-deep)" />
225 </marker>
226 <marker
227 id="bia-arrow-idle"
228 viewBox="0 0 8 8"
229 refX="7"
230 refY="4"
231 markerWidth="6"
232 markerHeight="6"
233 orient="auto"
234 >
235 <path d="M0 0 L8 4 L0 8 Z" fill="var(--alc-fg-3)" />
236 </marker>
237 </defs>
238 {ROWS.map((r, i) => {
239 const y = 50 + i * 90;
240 const isActive = active === i;
241 const stroke = isActive
242 ? "var(--alc-accent-deep)"
243 : "var(--alc-fg-3)";
244 const marker = isActive
245 ? "url(#bia-arrow-active)"
246 : "url(#bia-arrow-idle)";
247 return (
248 <g
249 key={r.id}
250 opacity={isActive ? 1 : 0.55}
251 style={{ transition: "opacity 320ms ease" }}
252 >
253 <path
254 d={`M 0 ${y} L 190 ${y}`}
255 stroke={stroke}
256 strokeWidth={isActive ? 1.8 : 1.1}
257 fill="none"
258 markerEnd={marker}
259 strokeDasharray={r.arrow.kind === "stream" ? "5 4" : "0"}
260 style={{
261 transition: "stroke 280ms ease, stroke-width 280ms ease",
262 }}
263 />
264 <text
265 x="100"
266 y={y - 8}
267 textAnchor="middle"
268 fontFamily="var(--alc-font-mono)"
269 fontSize="10"
270 fill={isActive ? "var(--alc-accent-deep)" : "var(--alc-fg-3)"}
271 style={{ transition: "fill 280ms ease" }}
272 >
273 {r.arrow.label}
274 </text>
275 </g>
276 );
277 })}
278 </svg>
279 </div>
280
281 {/* RIGHT — Resources */}
282 <div className="bindings-iam__resources">
283 {ROWS.map((r, i) => {
284 const isActive = active === i;
285 return (
286 <div
287 key={r.id}
288 className="bindings-iam__resource"
289 style={{
290 borderColor: isActive
291 ? "var(--alc-accent-deep)"
292 : "var(--alc-hairline)",
293 boxShadow: isActive
294 ? "0 0 0 2px rgba(74, 110, 60, 0.18)"
295 : "none",
296 transition: "border-color 280ms ease, box-shadow 280ms ease",
297 }}
298 >
299 <ResourceIcon kind={r.resource.kind} />
300 <div style={{ flex: 1, minWidth: 0 }}>
301 <div className="bindings-iam__resource-label">
302 {r.resource.label}
303 </div>
304 <div className="bindings-iam__resource-sub">
305 {r.resource.sub}
306 </div>
307 <div
308 className="bindings-iam__resource-iam"
309 data-stream={r.arrow.kind === "stream" ? "true" : undefined}
310 >
311 {r.arrow.kind === "stream" ? "↻" : "→"} {r.arrow.label}
312 </div>
313 </div>
314 </div>
315 );
316 })}
317 </div>
318 </div>
319 );
320}