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458 lines
10 KiB
458 lines
10 KiB
/*!
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* content-disposition
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* Copyright(c) 2014-2017 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module exports.
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* @public
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*/
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module.exports = contentDisposition
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module.exports.parse = parse
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/**
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* Module dependencies.
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* @private
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*/
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var basename = require('path').basename
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var Buffer = require('safe-buffer').Buffer
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/**
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* RegExp to match non attr-char, *after* encodeURIComponent (i.e. not including "%")
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* @private
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*/
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var ENCODE_URL_ATTR_CHAR_REGEXP = /[\x00-\x20"'()*,/:;<=>?@[\\\]{}\x7f]/g // eslint-disable-line no-control-regex
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/**
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* RegExp to match percent encoding escape.
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* @private
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*/
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var HEX_ESCAPE_REGEXP = /%[0-9A-Fa-f]{2}/
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var HEX_ESCAPE_REPLACE_REGEXP = /%([0-9A-Fa-f]{2})/g
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/**
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* RegExp to match non-latin1 characters.
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* @private
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*/
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var NON_LATIN1_REGEXP = /[^\x20-\x7e\xa0-\xff]/g
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/**
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* RegExp to match quoted-pair in RFC 2616
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*
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* quoted-pair = "\" CHAR
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* CHAR = <any US-ASCII character (octets 0 - 127)>
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* @private
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*/
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var QESC_REGEXP = /\\([\u0000-\u007f])/g // eslint-disable-line no-control-regex
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/**
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* RegExp to match chars that must be quoted-pair in RFC 2616
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* @private
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*/
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var QUOTE_REGEXP = /([\\"])/g
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/**
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* RegExp for various RFC 2616 grammar
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*
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* parameter = token "=" ( token | quoted-string )
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* token = 1*<any CHAR except CTLs or separators>
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* separators = "(" | ")" | "<" | ">" | "@"
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* | "," | ";" | ":" | "\" | <">
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* | "/" | "[" | "]" | "?" | "="
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* | "{" | "}" | SP | HT
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* quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
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* qdtext = <any TEXT except <">>
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* quoted-pair = "\" CHAR
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* CHAR = <any US-ASCII character (octets 0 - 127)>
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* TEXT = <any OCTET except CTLs, but including LWS>
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* LWS = [CRLF] 1*( SP | HT )
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* CRLF = CR LF
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* CR = <US-ASCII CR, carriage return (13)>
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* LF = <US-ASCII LF, linefeed (10)>
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* SP = <US-ASCII SP, space (32)>
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* HT = <US-ASCII HT, horizontal-tab (9)>
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* CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
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* OCTET = <any 8-bit sequence of data>
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* @private
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*/
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var PARAM_REGEXP = /;[\x09\x20]*([!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*=[\x09\x20]*("(?:[\x20!\x23-\x5b\x5d-\x7e\x80-\xff]|\\[\x20-\x7e])*"|[!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*/g // eslint-disable-line no-control-regex
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var TEXT_REGEXP = /^[\x20-\x7e\x80-\xff]+$/
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var TOKEN_REGEXP = /^[!#$%&'*+.0-9A-Z^_`a-z|~-]+$/
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/**
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* RegExp for various RFC 5987 grammar
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*
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* ext-value = charset "'" [ language ] "'" value-chars
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* charset = "UTF-8" / "ISO-8859-1" / mime-charset
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* mime-charset = 1*mime-charsetc
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* mime-charsetc = ALPHA / DIGIT
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* / "!" / "#" / "$" / "%" / "&"
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* / "+" / "-" / "^" / "_" / "`"
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* / "{" / "}" / "~"
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* language = ( 2*3ALPHA [ extlang ] )
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* / 4ALPHA
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* / 5*8ALPHA
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* extlang = *3( "-" 3ALPHA )
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* value-chars = *( pct-encoded / attr-char )
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* pct-encoded = "%" HEXDIG HEXDIG
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* attr-char = ALPHA / DIGIT
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* / "!" / "#" / "$" / "&" / "+" / "-" / "."
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* / "^" / "_" / "`" / "|" / "~"
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* @private
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*/
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var EXT_VALUE_REGEXP = /^([A-Za-z0-9!#$%&+\-^_`{}~]+)'(?:[A-Za-z]{2,3}(?:-[A-Za-z]{3}){0,3}|[A-Za-z]{4,8}|)'((?:%[0-9A-Fa-f]{2}|[A-Za-z0-9!#$&+.^_`|~-])+)$/
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/**
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* RegExp for various RFC 6266 grammar
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*
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* disposition-type = "inline" | "attachment" | disp-ext-type
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* disp-ext-type = token
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* disposition-parm = filename-parm | disp-ext-parm
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* filename-parm = "filename" "=" value
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* | "filename*" "=" ext-value
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* disp-ext-parm = token "=" value
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* | ext-token "=" ext-value
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* ext-token = <the characters in token, followed by "*">
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* @private
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*/
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var DISPOSITION_TYPE_REGEXP = /^([!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*(?:$|;)/ // eslint-disable-line no-control-regex
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/**
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* Create an attachment Content-Disposition header.
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*
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* @param {string} [filename]
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* @param {object} [options]
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* @param {string} [options.type=attachment]
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* @param {string|boolean} [options.fallback=true]
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* @return {string}
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* @public
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*/
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function contentDisposition (filename, options) {
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var opts = options || {}
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// get type
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var type = opts.type || 'attachment'
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// get parameters
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var params = createparams(filename, opts.fallback)
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// format into string
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return format(new ContentDisposition(type, params))
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}
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/**
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* Create parameters object from filename and fallback.
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*
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* @param {string} [filename]
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* @param {string|boolean} [fallback=true]
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* @return {object}
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* @private
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*/
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function createparams (filename, fallback) {
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if (filename === undefined) {
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return
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}
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var params = {}
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if (typeof filename !== 'string') {
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throw new TypeError('filename must be a string')
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}
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// fallback defaults to true
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if (fallback === undefined) {
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fallback = true
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}
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if (typeof fallback !== 'string' && typeof fallback !== 'boolean') {
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throw new TypeError('fallback must be a string or boolean')
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}
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if (typeof fallback === 'string' && NON_LATIN1_REGEXP.test(fallback)) {
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throw new TypeError('fallback must be ISO-8859-1 string')
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}
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// restrict to file base name
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var name = basename(filename)
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// determine if name is suitable for quoted string
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var isQuotedString = TEXT_REGEXP.test(name)
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// generate fallback name
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var fallbackName = typeof fallback !== 'string'
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? fallback && getlatin1(name)
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: basename(fallback)
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var hasFallback = typeof fallbackName === 'string' && fallbackName !== name
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// set extended filename parameter
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if (hasFallback || !isQuotedString || HEX_ESCAPE_REGEXP.test(name)) {
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params['filename*'] = name
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}
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// set filename parameter
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if (isQuotedString || hasFallback) {
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params.filename = hasFallback
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? fallbackName
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: name
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}
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return params
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}
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/**
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* Format object to Content-Disposition header.
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*
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* @param {object} obj
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* @param {string} obj.type
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* @param {object} [obj.parameters]
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* @return {string}
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* @private
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*/
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function format (obj) {
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var parameters = obj.parameters
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var type = obj.type
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if (!type || typeof type !== 'string' || !TOKEN_REGEXP.test(type)) {
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throw new TypeError('invalid type')
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}
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// start with normalized type
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var string = String(type).toLowerCase()
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// append parameters
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if (parameters && typeof parameters === 'object') {
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var param
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var params = Object.keys(parameters).sort()
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for (var i = 0; i < params.length; i++) {
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param = params[i]
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var val = param.substr(-1) === '*'
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? ustring(parameters[param])
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: qstring(parameters[param])
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string += '; ' + param + '=' + val
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}
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}
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return string
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}
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/**
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* Decode a RFC 6987 field value (gracefully).
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*
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* @param {string} str
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* @return {string}
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* @private
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*/
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function decodefield (str) {
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var match = EXT_VALUE_REGEXP.exec(str)
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if (!match) {
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throw new TypeError('invalid extended field value')
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}
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var charset = match[1].toLowerCase()
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var encoded = match[2]
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var value
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// to binary string
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var binary = encoded.replace(HEX_ESCAPE_REPLACE_REGEXP, pdecode)
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switch (charset) {
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case 'iso-8859-1':
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value = getlatin1(binary)
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break
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case 'utf-8':
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value = Buffer.from(binary, 'binary').toString('utf8')
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break
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default:
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throw new TypeError('unsupported charset in extended field')
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}
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return value
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}
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/**
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* Get ISO-8859-1 version of string.
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*
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* @param {string} val
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* @return {string}
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* @private
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*/
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function getlatin1 (val) {
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// simple Unicode -> ISO-8859-1 transformation
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return String(val).replace(NON_LATIN1_REGEXP, '?')
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}
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/**
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* Parse Content-Disposition header string.
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*
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* @param {string} string
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* @return {object}
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* @public
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*/
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function parse (string) {
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if (!string || typeof string !== 'string') {
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throw new TypeError('argument string is required')
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}
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var match = DISPOSITION_TYPE_REGEXP.exec(string)
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if (!match) {
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throw new TypeError('invalid type format')
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}
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// normalize type
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var index = match[0].length
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var type = match[1].toLowerCase()
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var key
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var names = []
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var params = {}
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var value
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// calculate index to start at
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index = PARAM_REGEXP.lastIndex = match[0].substr(-1) === ';'
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? index - 1
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: index
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// match parameters
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while ((match = PARAM_REGEXP.exec(string))) {
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if (match.index !== index) {
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throw new TypeError('invalid parameter format')
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}
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index += match[0].length
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key = match[1].toLowerCase()
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value = match[2]
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if (names.indexOf(key) !== -1) {
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throw new TypeError('invalid duplicate parameter')
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}
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names.push(key)
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if (key.indexOf('*') + 1 === key.length) {
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// decode extended value
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key = key.slice(0, -1)
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value = decodefield(value)
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// overwrite existing value
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params[key] = value
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continue
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}
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if (typeof params[key] === 'string') {
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continue
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}
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if (value[0] === '"') {
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// remove quotes and escapes
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value = value
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.substr(1, value.length - 2)
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.replace(QESC_REGEXP, '$1')
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}
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params[key] = value
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}
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if (index !== -1 && index !== string.length) {
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throw new TypeError('invalid parameter format')
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}
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return new ContentDisposition(type, params)
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}
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/**
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* Percent decode a single character.
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*
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* @param {string} str
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* @param {string} hex
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* @return {string}
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* @private
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*/
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function pdecode (str, hex) {
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return String.fromCharCode(parseInt(hex, 16))
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}
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/**
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* Percent encode a single character.
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*
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* @param {string} char
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* @return {string}
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* @private
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*/
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function pencode (char) {
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return '%' + String(char)
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.charCodeAt(0)
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.toString(16)
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.toUpperCase()
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}
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/**
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* Quote a string for HTTP.
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*
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* @param {string} val
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* @return {string}
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* @private
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*/
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function qstring (val) {
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var str = String(val)
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return '"' + str.replace(QUOTE_REGEXP, '\\$1') + '"'
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}
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/**
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* Encode a Unicode string for HTTP (RFC 5987).
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*
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* @param {string} val
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* @return {string}
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* @private
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*/
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function ustring (val) {
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var str = String(val)
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// percent encode as UTF-8
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var encoded = encodeURIComponent(str)
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.replace(ENCODE_URL_ATTR_CHAR_REGEXP, pencode)
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return 'UTF-8\'\'' + encoded
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}
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/**
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* Class for parsed Content-Disposition header for v8 optimization
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*
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* @public
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* @param {string} type
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* @param {object} parameters
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* @constructor
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*/
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function ContentDisposition (type, parameters) {
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this.type = type
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this.parameters = parameters
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}
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