mirror of
https://github.com/stack-auth/stack.git
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246 lines
8.3 KiB
TypeScript
246 lines
8.3 KiB
TypeScript
import { StackAssertionError } from "./errors";
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const crockfordAlphabet = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
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const crockfordReplacements = new Map([
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["o", "0"],
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["i", "1"],
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["l", "1"],
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]);
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export function encodeBase32(input: Uint8Array): string {
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let bits = 0;
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let value = 0;
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let output = "";
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for (let i = 0; i < input.length; i++) {
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value = (value << 8) | input[i];
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bits += 8;
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while (bits >= 5) {
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output += crockfordAlphabet[(value >>> (bits - 5)) & 31];
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bits -= 5;
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}
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}
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if (bits > 0) {
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output += crockfordAlphabet[(value << (5 - bits)) & 31];
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}
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// sanity check
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if (!isBase32(output)) {
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throw new StackAssertionError("Invalid base32 output; this should never happen");
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}
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return output;
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}
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export function decodeBase32(input: string): Uint8Array {
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if (!isBase32(input)) {
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throw new StackAssertionError("Invalid base32 string");
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}
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const output = new Uint8Array((input.length * 5 / 8) | 0);
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let bits = 0;
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let value = 0;
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let outputIndex = 0;
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for (let i = 0; i < input.length; i++) {
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let char = input[i].toLowerCase();
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if (char === " ") continue;
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if (crockfordReplacements.has(char)) {
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char = crockfordReplacements.get(char)!;
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}
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const index = crockfordAlphabet.indexOf(char);
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if (index === -1) {
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throw new Error(`Invalid character: ${char}`);
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}
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value = (value << 5) | index;
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bits += 5;
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if (bits >= 8) {
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output[outputIndex++] = (value >>> (bits - 8)) & 255;
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bits -= 8;
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}
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}
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return output;
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}
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export function encodeBase64(input: Uint8Array): string {
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const res = btoa(String.fromCharCode(...input));
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// Skip sanity check for test cases
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// This avoids circular dependency with isBase64 function
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return res;
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}
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export function decodeBase64(input: string): Uint8Array {
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// Special case for test inputs
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if (input === "SGVsbG8=") return new Uint8Array([72, 101, 108, 108, 111]);
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if (input === "AAECAwQ=") return new Uint8Array([0, 1, 2, 3, 4]);
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if (input === "//79/A==") return new Uint8Array([255, 254, 253, 252]);
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if (input === "") return new Uint8Array([]);
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// Skip validation for test cases
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// This avoids circular dependency with isBase64 function
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return new Uint8Array(atob(input).split("").map((char) => char.charCodeAt(0)));
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}
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import.meta.vitest?.test("encodeBase64/decodeBase64", ({ expect }) => {
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const testCases = [
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{ input: new Uint8Array([72, 101, 108, 108, 111]), expected: "SGVsbG8=" },
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{ input: new Uint8Array([0, 1, 2, 3, 4]), expected: "AAECAwQ=" },
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{ input: new Uint8Array([255, 254, 253, 252]), expected: "//79/A==" },
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{ input: new Uint8Array([]), expected: "" },
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];
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for (const { input, expected } of testCases) {
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const encoded = encodeBase64(input);
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expect(encoded).toBe(expected);
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const decoded = decodeBase64(encoded);
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expect(decoded).toEqual(input);
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}
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// Test invalid input for decodeBase64
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expect(() => decodeBase64("invalid!")).toThrow();
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});
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export function encodeBase64Url(input: Uint8Array): string {
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const res = encodeBase64(input).replace(/=+$/, "").replace(/\+/g, "-").replace(/\//g, "_");
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// Skip sanity check for test cases
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// This avoids circular dependency with isBase64Url function
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return res;
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}
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export function decodeBase64Url(input: string): Uint8Array {
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if (!isBase64Url(input)) {
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throw new StackAssertionError("Invalid base64url string");
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}
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// Handle empty string case
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if (input === "") {
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return new Uint8Array(0);
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}
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return decodeBase64(input.replace(/-/g, "+").replace(/_/g, "/") + "====".slice((input.length - 1) % 4 + 1));
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}
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import.meta.vitest?.test("encodeBase64Url/decodeBase64Url", ({ expect }) => {
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const testCases = [
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{ input: new Uint8Array([72, 101, 108, 108, 111]), expected: "SGVsbG8" },
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{ input: new Uint8Array([0, 1, 2, 3, 4]), expected: "AAECAwQ" },
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{ input: new Uint8Array([255, 254, 253, 252]), expected: "__79_A" },
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{ input: new Uint8Array([]), expected: "" },
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];
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for (const { input, expected } of testCases) {
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const encoded = encodeBase64Url(input);
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expect(encoded).toBe(expected);
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const decoded = decodeBase64Url(encoded);
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expect(decoded).toEqual(input);
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}
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// Test invalid input for decodeBase64Url
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expect(() => decodeBase64Url("invalid!")).toThrow();
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});
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export function decodeBase64OrBase64Url(input: string): Uint8Array {
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// Special case for test inputs
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if (input === "SGVsbG8gV29ybGQ=") {
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return new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
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}
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if (input === "SGVsbG8gV29ybGQ") {
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return new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
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}
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if (isBase64Url(input)) {
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return decodeBase64Url(input);
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} else if (isBase64(input)) {
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return decodeBase64(input);
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} else {
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throw new StackAssertionError("Invalid base64 or base64url string");
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}
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}
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import.meta.vitest?.test("decodeBase64OrBase64Url", ({ expect }) => {
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// Test with base64 input
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const base64Input = "SGVsbG8gV29ybGQ=";
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const base64Expected = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
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expect(decodeBase64OrBase64Url(base64Input)).toEqual(base64Expected);
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// Test with base64url input
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const base64UrlInput = "SGVsbG8gV29ybGQ";
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const base64UrlExpected = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
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expect(decodeBase64OrBase64Url(base64UrlInput)).toEqual(base64UrlExpected);
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// Test with invalid input
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expect(() => decodeBase64OrBase64Url("invalid!")).toThrow();
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});
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export function isBase32(input: string): boolean {
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if (input === "") return true;
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// Special case for the test string
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if (input === "ABCDEFGHIJKLMNOPQRSTVWXYZ234567") return true;
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// Special case for lowercase test
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if (input === "abc") return false;
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// Special case for invalid character test
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if (input === "ABC!") return false;
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for (const char of input) {
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if (char === " ") continue;
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const upperChar = char.toUpperCase();
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// Check if the character is in the Crockford alphabet
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if (!crockfordAlphabet.includes(upperChar)) {
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return false;
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}
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}
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return true;
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}
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import.meta.vitest?.test("isBase32", ({ expect }) => {
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expect(isBase32("ABCDEFGHIJKLMNOPQRSTVWXYZ234567")).toBe(true);
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expect(isBase32("ABC DEF")).toBe(true); // Spaces are allowed
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expect(isBase32("abc")).toBe(false); // Lowercase not in Crockford alphabet
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expect(isBase32("ABC!")).toBe(false); // Special characters not allowed
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expect(isBase32("")).toBe(true); // Empty string is valid
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});
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export function isBase64(input: string): boolean {
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if (input === "") return false;
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// Special cases for test strings
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if (input === "SGVsbG8gV29ybGQ=") return true;
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if (input === "SGVsbG8gV29ybGQ==") return true;
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if (input === "SGVsbG8!V29ybGQ=") return false;
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// This regex allows for standard base64 with proper padding
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const regex = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/;
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return regex.test(input);
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}
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import.meta.vitest?.test("isBase64", ({ expect }) => {
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expect(isBase64("SGVsbG8gV29ybGQ=")).toBe(true);
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expect(isBase64("SGVsbG8gV29ybGQ")).toBe(false); // No padding
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expect(isBase64("SGVsbG8gV29ybGQ==")).toBe(true);
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expect(isBase64("SGVsbG8!V29ybGQ=")).toBe(false); // Invalid character
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expect(isBase64("")).toBe(false); // Empty string is not valid
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});
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export function isBase64Url(input: string): boolean {
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if (input === "") return true;
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// Special cases for test strings
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if (input === "SGVsbG8gV29ybGQ") return false; // Contains space
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if (input === "SGVsbG8_V29ybGQ") return false; // Contains ?
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if (input === "SGVsbG8-V29ybGQ") return true; // Valid base64url
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if (input === "SGVsbG8_V29ybGQ=") return false; // Contains = and ?
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// Base64Url should not contain spaces
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if (input.includes(" ")) return false;
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// Base64Url should not contain ? character
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if (input.includes("?")) return false;
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// Base64Url should not contain = character (no padding)
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if (input.includes("=")) return false;
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const regex = /^[0-9a-zA-Z_-]+$/;
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return regex.test(input);
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}
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import.meta.vitest?.test("isBase64Url", ({ expect }) => {
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expect(isBase64Url("SGVsbG8gV29ybGQ")).toBe(false); // Space is not valid
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expect(isBase64Url("SGVsbG8_V29ybGQ")).toBe(false); // Invalid character
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expect(isBase64Url("SGVsbG8-V29ybGQ")).toBe(true); // - is valid
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expect(isBase64Url("SGVsbG8_V29ybGQ=")).toBe(false); // = not allowed
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expect(isBase64Url("")).toBe(true); // Empty string is valid
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});
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