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'use strict';
var log = require('debug')('node-stringprep')
// from unicode/uidna.h
var UIDNA_ALLOW_UNASSIGNED = 1
var UIDNA_USE_STD3_RULES = 2
try {
var bindings = require('bindings')('node_stringprep.node')
} catch (ex) {
log(
'Cannot load StringPrep-' +
require('./package.json').version +
' bindings (using fallback). You may need to ' +
'`npm install node-stringprep`'
)
log(ex)
}
var toUnicode = function(value, options) {
options = options || {}
try {
return bindings.toUnicode(value,
(options.allowUnassigned && UIDNA_ALLOW_UNASSIGNED) | 0)
} catch (e) {
return value
}
}
var toASCII = function(value, options) {
options = options || {}
try {
return bindings.toASCII(value,
(options.allowUnassigned && UIDNA_ALLOW_UNASSIGNED) |
(options.useSTD3Rules && UIDNA_USE_STD3_RULES))
} catch (e) {
if (options.throwIfError) {
throw e
} else {
return value
}
}
}
var StringPrep = function(operation) {
this.operation = operation
try {
this.stringPrep = new bindings.StringPrep(this.operation)
} catch (e) {
this.stringPrep = null
log('Operation does not exist', operation, e)
}
}
StringPrep.prototype.UNKNOWN_PROFILE_TYPE = 'Unknown profile type'
StringPrep.prototype.UNHANDLED_FALLBACK = 'Unhandled JS fallback'
StringPrep.prototype.LIBICU_NOT_AVAILABLE = 'libicu unavailable'
StringPrep.prototype.useJsFallbacks = true
StringPrep.prototype.prepare = function(value) {
this.value = value
try {
if (this.stringPrep) {
return this.stringPrep.prepare(this.value)
}
} catch (e) {}
if (false === this.useJsFallbacks) {
throw new Error(this.LIBICU_NOT_AVAILABLE)
}
return this.jsFallback()
}
StringPrep.prototype.isNative = function() {
return (null !== this.stringPrep)
}
StringPrep.prototype.jsFallback = function() {
switch (this.operation) {
case 'nameprep':
case 'nodeprep':
return this.value.toLowerCase()
case 'resourceprep':
return this.value
case 'nfs4_cs_prep':
case 'nfs4_cis_prep':
case 'nfs4_mixed_prep prefix':
case 'nfs4_mixed_prep suffix':
case 'iscsi':
case 'mib':
case 'saslprep':
case 'trace':
case 'ldap':
case 'ldapci':
throw new Error(this.UNHANDLED_FALLBACK)
default:
throw new Error(this.UNKNOWN_PROFILE_TYPE)
}
}
StringPrep.prototype.disableJsFallbacks = function() {
this.useJsFallbacks = false
}
StringPrep.prototype.enableJsFallbacks = function() {
this.useJsFallbacks = true
}
module.exports = {
toUnicode: toUnicode,
toASCII: toASCII,
StringPrep: StringPrep
}
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