diff --git a/deno.json b/deno.json index 3c93e9a..2fc4811 100644 --- a/deno.json +++ b/deno.json @@ -4,7 +4,8 @@ "check-all": "deno fmt --check && deno lint && deno task typecheck && deno test --allow-read" }, "imports": { - "assert": "https://deno.land/std@0.196.0/testing/asserts.ts" + "assert": "https://deno.land/std@0.196.0/testing/asserts.ts", + "mock": "https://deno.land/std@0.196.0/testing/mock.ts" }, "compilerOptions": { "lib": ["deno.ns", "dom"] diff --git a/deno.lock b/deno.lock index 8723785..6f1f799 100644 --- a/deno.lock +++ b/deno.lock @@ -29,6 +29,7 @@ "https://deno.land/std@0.196.0/assert/unimplemented.ts": "d56fbeecb1f108331a380f72e3e010a1f161baa6956fd0f7cf3e095ae1a4c75a", "https://deno.land/std@0.196.0/assert/unreachable.ts": "4600dc0baf7d9c15a7f7d234f00c23bca8f3eba8b140286aaca7aa998cf9a536", "https://deno.land/std@0.196.0/fmt/colors.ts": "a7eecffdf3d1d54db890723b303847b6e0a1ab4b528ba6958b8f2e754cf1b3bc", - "https://deno.land/std@0.196.0/testing/asserts.ts": "b4e4b1359393aeff09e853e27901a982c685cb630df30426ed75496961931946" + "https://deno.land/std@0.196.0/testing/asserts.ts": "b4e4b1359393aeff09e853e27901a982c685cb630df30426ed75496961931946", + "https://deno.land/std@0.196.0/testing/mock.ts": "4c52b8312d159179fdd9d9a1b35e342ee4e1a1248f29e5c7f57fb4011c3f55ed" } } diff --git a/public/common/base64url.js b/public/common/base64url.js new file mode 100644 index 0000000..e9c30a6 --- /dev/null +++ b/public/common/base64url.js @@ -0,0 +1,38 @@ +// @ts-check + +/** + * Convert a `Uint8Array` to a URL-safe base64 string. + * @param {Uint8Array} bytes + * @returns {string} + */ +export const stringify = (bytes) => { + const string = String.fromCharCode(...bytes); + const base64 = btoa(string); + return base64 + .replaceAll("+", "-") + .replaceAll("/", "_") + .replaceAll("=", ""); +}; + +/** + * Convert a URL-safe base64 string to a `Uint8Array`. + * Returns `null` if the string is invalid. + * @param {string} text + * @returns {null | Uint8Array} + */ +export const parse = (text) => { + const normalizedText = text + .replaceAll("-", "+") + .replaceAll("_", "/") + .replaceAll(" ", "+"); + try { + const string = atob(normalizedText); + const bytes = new Uint8Array(string.length); + for (let i = 0; i < string.length; i++) { + bytes[i] = string.charCodeAt(i); + } + return bytes; + } catch (_err) { + return null; + } +}; diff --git a/public/common/maybeJsonParse.js b/public/common/maybeJsonParse.js new file mode 100644 index 0000000..20592cd --- /dev/null +++ b/public/common/maybeJsonParse.js @@ -0,0 +1,14 @@ +// @ts-check + +/** + * Like `JSON.parse`, but returns `null` instead of throwing an error. + * @param {string} text + * @returns {unknown} + */ +export default (text) => { + try { + return JSON.parse(text); + } catch (_err) { + return null; + } +}; diff --git a/public/index/index.js b/public/index/index.js index 5e25790..b3ff99d 100644 --- a/public/index/index.js +++ b/public/index/index.js @@ -2,6 +2,7 @@ import { SUPPORTED_FILE_TYPES } from "./constants.js"; import crel from "../common/crel.js"; +import * as base64url from "../common/base64url.js"; import { routeFile } from "./fileRouter.js"; const accept = SUPPORTED_FILE_TYPES @@ -45,12 +46,7 @@ const disclaimerParagraphEl = crel( const formatBytes = async (blob) => { const arrayBuffer = await blob.arrayBuffer(); const bytes = new Uint8Array(arrayBuffer); - const string = String.fromCharCode(...bytes); - const base64 = btoa(string); - return base64 - .replaceAll("+", "-") - .replaceAll("/", "_") - .replaceAll("=", ""); + return base64url.stringify(bytes); }; const main = () => { diff --git a/public/png/index.html b/public/png/index.html new file mode 100644 index 0000000..786effd --- /dev/null +++ b/public/png/index.html @@ -0,0 +1,21 @@ + + + + + formats.exposed/png + + + + + + + + + + + diff --git a/public/png/parseHash.js b/public/png/parseHash.js new file mode 100644 index 0000000..bc0fc10 --- /dev/null +++ b/public/png/parseHash.js @@ -0,0 +1,41 @@ +// @ts-check + +import maybeJsonParse from "../common/maybeJsonParse.js"; +import * as base64url from "../common/base64url.js"; + +/** + * Parse a location hash into `name` and `bytes`. + * @param {string} hash + * @returns {null | { name: string, bytes: Uint8Array }} The parsed data, or `null` if the hash can't be parsed. + */ +export default (hash) => { + const normalizedHash = decodeURI(hash.replace(/^#/, "")); + + const parsed = maybeJsonParse(normalizedHash); + if (!parsed || typeof parsed !== "object") { + console.warn("Couldn't parse hash as JSON object"); + return null; + } + + if ( + !("name" in parsed) || (typeof parsed.name !== "string") || + !("bytes" in parsed) || (typeof parsed.bytes !== "string") + ) { + console.warn("Hash fields missing or invalid type"); + return null; + } + + const { name } = parsed; + if (!name) { + console.warn("Name is empty"); + return null; + } + + const bytes = base64url.parse(parsed.bytes); + if (!bytes || !bytes.byteLength) { + console.warn("Bytes is empty"); + return null; + } + + return { name, bytes }; +}; diff --git a/public/png/png.css b/public/png/png.css new file mode 100644 index 0000000..e69de29 diff --git a/public/png/png.js b/public/png/png.js new file mode 100644 index 0000000..05eb284 --- /dev/null +++ b/public/png/png.js @@ -0,0 +1,21 @@ +// @ts-check + +import parseHash from "./parseHash.js"; + +const errorEl = document.getElementById("error"); +const explorerEl = document.getElementById("explorer"); +if (!errorEl || !explorerEl) throw new Error("HTML is not set up correctly"); + +const main = () => { + // TODO: We may want a better UI here. + const parsedHash = parseHash(location.hash); + if (!parsedHash) { + location.href = ".."; + return; + } + + // TODO: Actually do something! + console.log(parsedHash); +}; + +main(); diff --git a/public/png/vendor/pako_inflate.min.js b/public/png/vendor/pako_inflate.min.js new file mode 100644 index 0000000..cbf7304 --- /dev/null +++ b/public/png/vendor/pako_inflate.min.js @@ -0,0 +1,4 @@ +// deno-lint-ignore-file +// deno-fmt-ignore-file +/*! pako 2.1.0 https://github.com/nodeca/pako @license (MIT AND Zlib) */ +!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).pako={})}(this,(function(e){"use strict";var t=(e,t,i,n)=>{let a=65535&e|0,r=e>>>16&65535|0,o=0;for(;0!==i;){o=i>2e3?2e3:i,i-=o;do{a=a+t[n++]|0,r=r+a|0}while(--o);a%=65521,r%=65521}return a|r<<16|0};const i=new Uint32Array((()=>{let e,t=[];for(var i=0;i<256;i++){e=i;for(var n=0;n<8;n++)e=1&e?3988292384^e>>>1:e>>>1;t[i]=e}return t})());var n=(e,t,n,a)=>{const r=i,o=a+n;e^=-1;for(let i=a;i>>8^r[255&(e^t[i])];return-1^e};const a=16209;var r=function(e,t){let i,n,r,o,s,l,d,f,c,h,u,w,b,m,k,_,g,p,v,x,y,E,R,A;const 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we=he,be=ue,me=function(e,t){return(t=t||{}).raw=!0,ue(e,t)},ke=ue,_e=h,ge={Inflate:we,inflate:be,inflateRaw:me,ungzip:ke,constants:_e};e.Inflate=we,e.constants=_e,e.default=ge,e.inflate=be,e.inflateRaw=me,e.ungzip=ke,Object.defineProperty(e,"__esModule",{value:!0})})); diff --git a/test/common/base64url.test.ts b/test/common/base64url.test.ts new file mode 100644 index 0000000..d881f53 --- /dev/null +++ b/test/common/base64url.test.ts @@ -0,0 +1,47 @@ +import { assertEquals } from "assert"; +import * as base64url from "../../public/common/base64url.js"; + +/** + * A shorthand for `new Uint8Array()`. + */ +const b = (...bytes: number[]) => new Uint8Array(bytes); + +Deno.test('encodes no bytes as ""', () => { + assertEquals(base64url.stringify(b()), ""); +}); + +Deno.test("encodes in a URL-safe way", () => { + const input = b(105, 183, 62, 249, 215, 191, 254); + assertEquals( + base64url.stringify(input), + "abc--de__g", + ); +}); + +Deno.test("decodes the empty string", () => { + assertEquals(base64url.parse(""), b()); +}); + +Deno.test("decodes URL-safe strings", () => { + assertEquals(base64url.parse("_-o"), b(255, 234)); +}); + +Deno.test("decodes URL-unsafe strings (as a bonus)", () => { + assertEquals(base64url.parse("/+o="), b(255, 234)); +}); + +Deno.test("round-trips", () => { + const testCases = [ + b(), + b(1), + b(1, 2, 3), + b(255, 234), + b(105, 183, 62, 249, 215, 191, 254), + ]; + + for (const original of testCases) { + const string = base64url.stringify(original); + const parsed = base64url.parse(string); + assertEquals(parsed, original, `Round-trip failed for ${original}`); + } +}); diff --git a/test/common/maybeJsonParse.test.ts b/test/common/maybeJsonParse.test.ts new file mode 100644 index 0000000..be056fa --- /dev/null +++ b/test/common/maybeJsonParse.test.ts @@ -0,0 +1,12 @@ +import { assertEquals } from "assert"; +import maybeJsonParse from "../../public/common/maybeJsonParse.js"; + +Deno.test("returns null if string can't be parsed", () => { + assertEquals(maybeJsonParse(""), null); + assertEquals(maybeJsonParse('{"hi":'), null); +}); + +Deno.test("parses valid JSON", () => { + assertEquals(maybeJsonParse("123"), 123); + assertEquals(maybeJsonParse('{"hi": 5}'), { hi: 5 }); +}); diff --git a/test/png/parseHash.test.ts b/test/png/parseHash.test.ts new file mode 100644 index 0000000..953754f --- /dev/null +++ b/test/png/parseHash.test.ts @@ -0,0 +1,38 @@ +import { assertEquals } from "assert"; +import { stub } from "mock"; +import parseHash from "../../public/png/parseHash.js"; + +Deno.test("returns null if hash cannot be parsed", () => { + const testCases = [ + // Missing fields + "#null", + "#{}", + "#{%22name%22:%22image.png%22}", + "#{%22bytes%22:%22AQID%22}", + // Invalid JSON + "", + "#{%22name%22:%22small.png%22,%22bytes%22:%22iAQID", + ]; + + const warnStub = stub(console, "warn"); + + try { + for (const testCase of testCases) { + assertEquals( + parseHash(testCase), + null, + `Parsing ${testCase} should fail`, + ); + } + } finally { + warnStub.restore(); + } +}); + +Deno.test("parses hashes", () => { + const hash = "#{%22name%22:%22small.png%22,%22bytes%22:%22AQID%22}"; + assertEquals(parseHash(hash), { + name: "small.png", + bytes: new Uint8Array([1, 2, 3]), + }); +});