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audiobookshelf/server/libs/busboy/utils.js

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16 KiB
JavaScript
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'use strict';
function parseContentType(str) {
if (str.length === 0)
return;
const params = Object.create(null);
let i = 0;
// Parse type
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
if (code !== 47/* '/' */ || i === 0)
return;
break;
}
}
// Check for type without subtype
if (i === str.length)
return;
const type = str.slice(0, i).toLowerCase();
// Parse subtype
const subtypeStart = ++i;
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
// Make sure we have a subtype
if (i === subtypeStart)
return;
if (parseContentTypeParams(str, i, params) === undefined)
return;
break;
}
}
// Make sure we have a subtype
if (i === subtypeStart)
return;
const subtype = str.slice(subtypeStart, i).toLowerCase();
return { type, subtype, params };
}
function parseContentTypeParams(str, i, params) {
while (i < str.length) {
// Consume whitespace
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code !== 32/* ' ' */ && code !== 9/* '\t' */)
break;
}
// Ended on whitespace
if (i === str.length)
break;
// Check for malformed parameter
if (str.charCodeAt(i++) !== 59/* ';' */)
return;
// Consume whitespace
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code !== 32/* ' ' */ && code !== 9/* '\t' */)
break;
}
// Ended on whitespace (malformed)
if (i === str.length)
return;
let name;
const nameStart = i;
// Parse parameter name
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
if (code !== 61/* '=' */)
return;
break;
}
}
// No value (malformed)
if (i === str.length)
return;
name = str.slice(nameStart, i);
++i; // Skip over '='
// No value (malformed)
if (i === str.length)
return;
let value = '';
let valueStart;
if (str.charCodeAt(i) === 34/* '"' */) {
valueStart = ++i;
let escaping = false;
// Parse quoted value
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code === 92/* '\\' */) {
if (escaping) {
valueStart = i;
escaping = false;
} else {
value += str.slice(valueStart, i);
escaping = true;
}
continue;
}
if (code === 34/* '"' */) {
if (escaping) {
valueStart = i;
escaping = false;
continue;
}
value += str.slice(valueStart, i);
break;
}
if (escaping) {
valueStart = i - 1;
escaping = false;
}
// Invalid unescaped quoted character (malformed)
if (QDTEXT[code] !== 1)
return;
}
// No end quote (malformed)
if (i === str.length)
return;
++i; // Skip over double quote
} else {
valueStart = i;
// Parse unquoted value
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
// No value (malformed)
if (i === valueStart)
return;
break;
}
}
value = str.slice(valueStart, i);
}
name = name.toLowerCase();
if (params[name] === undefined)
params[name] = value;
}
return params;
}
function parseDisposition(str, defDecoder) {
if (str.length === 0)
return;
const params = Object.create(null);
let i = 0;
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
if (parseDispositionParams(str, i, params, defDecoder) === undefined)
return;
break;
}
}
const type = str.slice(0, i).toLowerCase();
return { type, params };
}
function parseDispositionParams(str, i, params, defDecoder) {
while (i < str.length) {
// Consume whitespace
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code !== 32/* ' ' */ && code !== 9/* '\t' */)
break;
}
// Ended on whitespace
if (i === str.length)
break;
// Check for malformed parameter
if (str.charCodeAt(i++) !== 59/* ';' */)
return;
// Consume whitespace
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code !== 32/* ' ' */ && code !== 9/* '\t' */)
break;
}
// Ended on whitespace (malformed)
if (i === str.length)
return;
let name;
const nameStart = i;
// Parse parameter name
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
if (code === 61/* '=' */)
break;
return;
}
}
// No value (malformed)
if (i === str.length)
return;
let value = '';
let valueStart;
let charset;
//~ let lang;
name = str.slice(nameStart, i);
if (name.charCodeAt(name.length - 1) === 42/* '*' */) {
// Extended value
const charsetStart = ++i;
// Parse charset name
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (CHARSET[code] !== 1) {
if (code !== 39/* '\'' */)
return;
break;
}
}
// Incomplete charset (malformed)
if (i === str.length)
return;
charset = str.slice(charsetStart, i);
++i; // Skip over the '\''
//~ const langStart = ++i;
// Parse language name
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code === 39/* '\'' */)
break;
}
// Incomplete language (malformed)
if (i === str.length)
return;
//~ lang = str.slice(langStart, i);
++i; // Skip over the '\''
// No value (malformed)
if (i === str.length)
return;
valueStart = i;
let encode = 0;
// Parse value
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (EXTENDED_VALUE[code] !== 1) {
if (code === 37/* '%' */) {
let hexUpper;
let hexLower;
if (i + 2 < str.length
&& (hexUpper = HEX_VALUES[str.charCodeAt(i + 1)]) !== -1
&& (hexLower = HEX_VALUES[str.charCodeAt(i + 2)]) !== -1) {
const byteVal = (hexUpper << 4) + hexLower;
value += str.slice(valueStart, i);
value += String.fromCharCode(byteVal);
i += 2;
valueStart = i + 1;
if (byteVal >= 128)
encode = 2;
else if (encode === 0)
encode = 1;
continue;
}
// '%' disallowed in non-percent encoded contexts (malformed)
return;
}
break;
}
}
value += str.slice(valueStart, i);
value = convertToUTF8(value, charset, encode);
if (value === undefined)
return;
} else {
// Non-extended value
++i; // Skip over '='
// No value (malformed)
if (i === str.length)
return;
if (str.charCodeAt(i) === 34/* '"' */) {
valueStart = ++i;
let escaping = false;
// Parse quoted value
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (code === 92/* '\\' */) {
if (escaping) {
valueStart = i;
escaping = false;
} else {
value += str.slice(valueStart, i);
escaping = true;
}
continue;
}
if (code === 34/* '"' */) {
if (escaping) {
valueStart = i;
escaping = false;
continue;
}
value += str.slice(valueStart, i);
break;
}
if (escaping) {
valueStart = i - 1;
escaping = false;
}
// Invalid unescaped quoted character (malformed)
if (QDTEXT[code] !== 1)
return;
}
// No end quote (malformed)
if (i === str.length)
return;
++i; // Skip over double quote
} else {
valueStart = i;
// Parse unquoted value
for (; i < str.length; ++i) {
const code = str.charCodeAt(i);
if (TOKEN[code] !== 1) {
// No value (malformed)
if (i === valueStart)
return;
break;
}
}
value = str.slice(valueStart, i);
}
value = defDecoder(value, 2);
if (value === undefined)
return;
}
name = name.toLowerCase();
if (params[name] === undefined)
params[name] = value;
}
return params;
}
function getDecoder(charset) {
let lc;
while (true) {
switch (charset) {
case 'utf-8':
case 'utf8':
return decoders.utf8;
case 'latin1':
case 'ascii': // TODO: Make these a separate, strict decoder?
case 'us-ascii':
case 'iso-8859-1':
case 'iso8859-1':
case 'iso88591':
case 'iso_8859-1':
case 'windows-1252':
case 'iso_8859-1:1987':
case 'cp1252':
case 'x-cp1252':
return decoders.latin1;
case 'utf16le':
case 'utf-16le':
case 'ucs2':
case 'ucs-2':
return decoders.utf16le;
case 'base64':
return decoders.base64;
default:
if (lc === undefined) {
lc = true;
charset = charset.toLowerCase();
continue;
}
return decoders.other.bind(charset);
}
}
}
const decoders = {
utf8: (data, hint) => {
if (data.length === 0)
return '';
if (typeof data === 'string') {
// If `data` never had any percent-encoded bytes or never had any that
// were outside of the ASCII range, then we can safely just return the
// input since UTF-8 is ASCII compatible
if (hint < 2)
return data;
data = Buffer.from(data, 'latin1');
}
return data.utf8Slice(0, data.length);
},
latin1: (data, hint) => {
if (data.length === 0)
return '';
if (typeof data === 'string')
return data;
return data.latin1Slice(0, data.length);
},
utf16le: (data, hint) => {
if (data.length === 0)
return '';
if (typeof data === 'string')
data = Buffer.from(data, 'latin1');
return data.ucs2Slice(0, data.length);
},
base64: (data, hint) => {
if (data.length === 0)
return '';
if (typeof data === 'string')
data = Buffer.from(data, 'latin1');
return data.base64Slice(0, data.length);
},
other: (data, hint) => {
if (data.length === 0)
return '';
if (typeof data === 'string')
data = Buffer.from(data, 'latin1');
try {
const decoder = new TextDecoder(this);
return decoder.decode(data);
} catch {}
},
};
function convertToUTF8(data, charset, hint) {
const decode = getDecoder(charset);
if (decode)
return decode(data, hint);
}
function basename(path) {
if (typeof path !== 'string')
return '';
for (let i = path.length - 1; i >= 0; --i) {
switch (path.charCodeAt(i)) {
case 0x2F: // '/'
case 0x5C: // '\'
path = path.slice(i + 1);
return (path === '..' || path === '.' ? '' : path);
}
}
return (path === '..' || path === '.' ? '' : path);
}
const TOKEN = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
const QDTEXT = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
];
const CHARSET = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
const EXTENDED_VALUE = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
/* eslint-disable no-multi-spaces */
const HEX_VALUES = [
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
];
/* eslint-enable no-multi-spaces */
module.exports = {
basename,
convertToUTF8,
getDecoder,
parseContentType,
parseDisposition,
};
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