File size: 8,610 Bytes
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* Avoid modifying this file. It's part of
* https://github.com/supabase-community/base64url-js. Submit all fixes on
* that repo!
*/
/**
* An array of characters that encode 6 bits into a Base64-URL alphabet
* character.
*/
const TO_BASE64URL = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'.split('');
/**
* An array of characters that can appear in a Base64-URL encoded string but
* should be ignored.
*/
const IGNORE_BASE64URL = ' \t\n\r='.split('');
/**
* An array of 128 numbers that map a Base64-URL character to 6 bits, or if -2
* used to skip the character, or if -1 used to error out.
*/
const FROM_BASE64URL = (() => {
const charMap = new Array(128);
for (let i = 0; i < charMap.length; i += 1) {
charMap[i] = -1;
}
for (let i = 0; i < IGNORE_BASE64URL.length; i += 1) {
charMap[IGNORE_BASE64URL[i].charCodeAt(0)] = -2;
}
for (let i = 0; i < TO_BASE64URL.length; i += 1) {
charMap[TO_BASE64URL[i].charCodeAt(0)] = i;
}
return charMap;
})();
/**
* Converts a byte to a Base64-URL string.
*
* @param byte The byte to convert, or null to flush at the end of the byte sequence.
* @param state The Base64 conversion state. Pass an initial value of `{ queue: 0, queuedBits: 0 }`.
* @param emit A function called with the next Base64 character when ready.
*/
export function byteToBase64URL(byte, state, emit) {
if (byte !== null) {
state.queue = (state.queue << 8) | byte;
state.queuedBits += 8;
while (state.queuedBits >= 6) {
const pos = (state.queue >> (state.queuedBits - 6)) & 63;
emit(TO_BASE64URL[pos]);
state.queuedBits -= 6;
}
}
else if (state.queuedBits > 0) {
state.queue = state.queue << (6 - state.queuedBits);
state.queuedBits = 6;
while (state.queuedBits >= 6) {
const pos = (state.queue >> (state.queuedBits - 6)) & 63;
emit(TO_BASE64URL[pos]);
state.queuedBits -= 6;
}
}
}
/**
* Converts a String char code (extracted using `string.charCodeAt(position)`) to a sequence of Base64-URL characters.
*
* @param charCode The char code of the JavaScript string.
* @param state The Base64 state. Pass an initial value of `{ queue: 0, queuedBits: 0 }`.
* @param emit A function called with the next byte.
*/
export function byteFromBase64URL(charCode, state, emit) {
const bits = FROM_BASE64URL[charCode];
if (bits > -1) {
// valid Base64-URL character
state.queue = (state.queue << 6) | bits;
state.queuedBits += 6;
while (state.queuedBits >= 8) {
emit((state.queue >> (state.queuedBits - 8)) & 0xff);
state.queuedBits -= 8;
}
}
else if (bits === -2) {
// ignore spaces, tabs, newlines, =
return;
}
else {
throw new Error(`Invalid Base64-URL character "${String.fromCharCode(charCode)}"`);
}
}
/**
* Converts a JavaScript string (which may include any valid character) into a
* Base64-URL encoded string. The string is first encoded in UTF-8 which is
* then encoded as Base64-URL.
*
* @param str The string to convert.
*/
export function stringToBase64URL(str) {
const base64 = [];
const emitter = (char) => {
base64.push(char);
};
const state = { queue: 0, queuedBits: 0 };
stringToUTF8(str, (byte) => {
byteToBase64URL(byte, state, emitter);
});
byteToBase64URL(null, state, emitter);
return base64.join('');
}
/**
* Converts a Base64-URL encoded string into a JavaScript string. It is assumed
* that the underlying string has been encoded as UTF-8.
*
* @param str The Base64-URL encoded string.
*/
export function stringFromBase64URL(str) {
const conv = [];
const utf8Emit = (codepoint) => {
conv.push(String.fromCodePoint(codepoint));
};
const utf8State = {
utf8seq: 0,
codepoint: 0,
};
const b64State = { queue: 0, queuedBits: 0 };
const byteEmit = (byte) => {
stringFromUTF8(byte, utf8State, utf8Emit);
};
for (let i = 0; i < str.length; i += 1) {
byteFromBase64URL(str.charCodeAt(i), b64State, byteEmit);
}
return conv.join('');
}
/**
* Converts a Unicode codepoint to a multi-byte UTF-8 sequence.
*
* @param codepoint The Unicode codepoint.
* @param emit Function which will be called for each UTF-8 byte that represents the codepoint.
*/
export function codepointToUTF8(codepoint, emit) {
if (codepoint <= 0x7f) {
emit(codepoint);
return;
}
else if (codepoint <= 0x7ff) {
emit(0xc0 | (codepoint >> 6));
emit(0x80 | (codepoint & 0x3f));
return;
}
else if (codepoint <= 0xffff) {
emit(0xe0 | (codepoint >> 12));
emit(0x80 | ((codepoint >> 6) & 0x3f));
emit(0x80 | (codepoint & 0x3f));
return;
}
else if (codepoint <= 0x10ffff) {
emit(0xf0 | (codepoint >> 18));
emit(0x80 | ((codepoint >> 12) & 0x3f));
emit(0x80 | ((codepoint >> 6) & 0x3f));
emit(0x80 | (codepoint & 0x3f));
return;
}
throw new Error(`Unrecognized Unicode codepoint: ${codepoint.toString(16)}`);
}
/**
* Converts a JavaScript string to a sequence of UTF-8 bytes.
*
* @param str The string to convert to UTF-8.
* @param emit Function which will be called for each UTF-8 byte of the string.
*/
export function stringToUTF8(str, emit) {
for (let i = 0; i < str.length; i += 1) {
let codepoint = str.charCodeAt(i);
if (codepoint > 0xd7ff && codepoint <= 0xdbff) {
// most UTF-16 codepoints are Unicode codepoints, except values in this
// range where the next UTF-16 codepoint needs to be combined with the
// current one to get the Unicode codepoint
const highSurrogate = ((codepoint - 0xd800) * 0x400) & 0xffff;
const lowSurrogate = (str.charCodeAt(i + 1) - 0xdc00) & 0xffff;
codepoint = (lowSurrogate | highSurrogate) + 0x10000;
i += 1;
}
codepointToUTF8(codepoint, emit);
}
}
/**
* Converts a UTF-8 byte to a Unicode codepoint.
*
* @param byte The UTF-8 byte next in the sequence.
* @param state The shared state between consecutive UTF-8 bytes in the
* sequence, an object with the shape `{ utf8seq: 0, codepoint: 0 }`.
* @param emit Function which will be called for each codepoint.
*/
export function stringFromUTF8(byte, state, emit) {
if (state.utf8seq === 0) {
if (byte <= 0x7f) {
emit(byte);
return;
}
// count the number of 1 leading bits until you reach 0
for (let leadingBit = 1; leadingBit < 6; leadingBit += 1) {
if (((byte >> (7 - leadingBit)) & 1) === 0) {
state.utf8seq = leadingBit;
break;
}
}
if (state.utf8seq === 2) {
state.codepoint = byte & 31;
}
else if (state.utf8seq === 3) {
state.codepoint = byte & 15;
}
else if (state.utf8seq === 4) {
state.codepoint = byte & 7;
}
else {
throw new Error('Invalid UTF-8 sequence');
}
state.utf8seq -= 1;
}
else if (state.utf8seq > 0) {
if (byte <= 0x7f) {
throw new Error('Invalid UTF-8 sequence');
}
state.codepoint = (state.codepoint << 6) | (byte & 63);
state.utf8seq -= 1;
if (state.utf8seq === 0) {
emit(state.codepoint);
}
}
}
/**
* Helper functions to convert different types of strings to Uint8Array
*/
export function base64UrlToUint8Array(str) {
const result = [];
const state = { queue: 0, queuedBits: 0 };
const onByte = (byte) => {
result.push(byte);
};
for (let i = 0; i < str.length; i += 1) {
byteFromBase64URL(str.charCodeAt(i), state, onByte);
}
return new Uint8Array(result);
}
export function stringToUint8Array(str) {
const result = [];
stringToUTF8(str, (byte) => result.push(byte));
return new Uint8Array(result);
}
export function bytesToBase64URL(bytes) {
const result = [];
const state = { queue: 0, queuedBits: 0 };
const onChar = (char) => {
result.push(char);
};
bytes.forEach((byte) => byteToBase64URL(byte, state, onChar));
// always call with `null` after processing all bytes
byteToBase64URL(null, state, onChar);
return result.join('');
}
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