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src/main/kotlin/com/danneu/kog/negotiation/AcceptLanguage.kt
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| package com.danneu.kog.negotiation | ||
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| import kotlin.comparisons.compareBy | ||
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| // A **goofy** wrapper around accept-language prefix/suffix pairs like en, en-GB, en-US. | ||
| // | ||
| // The implementation got a bit gnarly since I was reverse-engineering how it should work from | ||
| // other server test cases and letting TDD drive my impl like a black box in some parts. | ||
| // | ||
| // https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html | ||
| // | ||
| // TODO: Incomplete, experimental. | ||
| // TODO: Finish language code list http://www.lingoes.net/en/translator/langcode.htm | ||
| // TODO: Maybe should keep it open-ended like any language being able to use any locale. | ||
| // TODO: Maybe should just simplify it into Pair("en", null), Pair("en", "US") style stuff. | ||
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| // This class is just a pair of language and its q-value. | ||
| // | ||
| // TODO: Maybe AcceptLanguage should be Pair<Lang, QValue>. Lang vs AcceptLanguage is confusing as top-level classes. | ||
| class AcceptLanguage(val lang: Lang, val q: Double = 1.0) { | ||
| override fun toString() = "AcceptLanguage[lang=$lang, q=$q]" | ||
| override fun equals(other: Any?) = other is AcceptLanguage && this.lang == other.lang && this.q == other.q | ||
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| // Generated by IDEA | ||
| override fun hashCode() = 31 * lang.hashCode() + q.hashCode() | ||
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| companion object { | ||
| val regex = Regex("""^\s*([^\s\-;]+)(?:-([^\s;]+))?\s*(?:;(.*))?$""") | ||
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| // TODO: Test malformed header | ||
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| fun acceptable(clientLang: Lang, availableLang: Lang, excludedLangs: Set<Lang>): Boolean { | ||
| if (availableLang in excludedLangs) return false | ||
| // clientLang is * so everything is acceptable | ||
| if (clientLang == Lang.Wildcard) return true | ||
| // if clientLang is "en" and "en-US" is available, it is acceptable | ||
| if (clientLang.locale == Locale.Wildcard && clientLang.name == availableLang.name) return true | ||
| // if clientLang is "en-US" and "en-US" is available | ||
| if (clientLang.name == availableLang.name) return true | ||
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| return false | ||
| } | ||
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| /** Parses a single segment pair | ||
| */ | ||
| fun parse(string: String): AcceptLanguage? { | ||
| val parts = regex.find(string)?.groupValues?.drop(1) ?: return null | ||
| // FIXME: temp hack since the refactor: rejoining parts with hyphen because that's what regex gives me | ||
| val lang = Lang.fromString("${parts[0]}-${parts[1]}") ?: return null | ||
| val q = QValue.parse(parts[2]) ?: 1.0 | ||
| return AcceptLanguage(lang, q) | ||
| } | ||
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| /** Parses comma-delimited string of types | ||
| */ | ||
| fun parseHeader(header: String): List<AcceptLanguage> { | ||
| return header.split(",").map(String::trim).mapNotNull(this::parse) | ||
| } | ||
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| fun prioritize(xs: List<AcceptLanguage>): List<AcceptLanguage> { | ||
| return xs.sortedWith(compareBy( | ||
| { -it.q }, | ||
| // Wildcard comes last | ||
| { when (it.lang) { | ||
| Lang.Wildcard -> | ||
| 1 | ||
| else -> | ||
| 0 | ||
| }} | ||
| )) | ||
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| } | ||
| } | ||
| } | ||
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| package com.danneu.kog.negotiation | ||
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| // TODO: Finish implementing http://www.lingoes.net/en/translator/langcode.htm | ||
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| sealed class Lang(val name: String, val locale: Locale = Locale.Wildcard) { | ||
| companion object { | ||
| fun fromString(input: String): Lang? { | ||
| val (prefix, localeString) = input.split("-", limit = 2) | ||
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| val locale = if (localeString.isEmpty()) { | ||
| Locale.Wildcard | ||
| } else { | ||
| Locale.fromString(localeString) | ||
| } | ||
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| // TODO: Decide how to handle languages with unknown locales. For now, they are skipped | ||
| locale ?: return null | ||
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| return when (prefix) { | ||
| "*" -> Wildcard | ||
| "en" -> English(locale) | ||
| "es" -> Spanish(locale) | ||
| "de" -> German(locale) | ||
| "it" -> Italian(locale) | ||
| "fr" -> French(locale) | ||
| "pt" -> Portuguese(locale) | ||
| "no" -> Norwegian(locale) | ||
| "se" -> Sami(locale) | ||
| "fi" -> Finnish(locale) | ||
| "ro" -> Romanian(locale) | ||
| "nl" -> Dutch(locale) | ||
| else -> null | ||
| } | ||
| } | ||
| } | ||
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| // Necessary for .distinctBy to work | ||
| override fun hashCode() = 31 * name.hashCode() + locale.hashCode() | ||
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| override fun toString() = if (locale == Locale.Wildcard) { | ||
| "$name[*]" | ||
| } else { | ||
| "$name[$locale]" | ||
| } | ||
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| override fun equals(other: Any?): Boolean { | ||
| return other is Lang && name == other.name && locale == other.locale | ||
| } | ||
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| object Wildcard : Lang("Wildcard") | ||
| class English (locale: Locale = Locale.Wildcard) : Lang("English", locale) | ||
| class Spanish (locale: Locale = Locale.Wildcard) : Lang("Spanish", locale) | ||
| class German (locale: Locale = Locale.Wildcard) : Lang("German", locale) | ||
| class French (locale: Locale = Locale.Wildcard) : Lang("French", locale) | ||
| class Italian (locale: Locale = Locale.Wildcard) : Lang("Italian", locale) | ||
| class Portuguese (locale: Locale = Locale.Wildcard) : Lang("Portuguese", locale) | ||
| class Norwegian (locale: Locale = Locale.Wildcard) : Lang("Norwegian", locale) | ||
| class Sami (locale: Locale = Locale.Wildcard) : Lang("Sami", locale) | ||
| class Finnish (locale: Locale = Locale.Wildcard) : Lang("Finnish", locale) | ||
| class Romanian (locale: Locale = Locale.Wildcard) : Lang("Romanian", locale) | ||
| class Dutch (locale: Locale = Locale.Wildcard) : Lang("Dutch", locale) | ||
| } |
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| package com.danneu.kog.negotiation | ||
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| import com.danneu.kog.Header | ||
| import com.danneu.kog.Request | ||
| import com.danneu.kog.toy | ||
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| enum class Locale { | ||
| // Special | ||
| Wildcard, | ||
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| // Locales | ||
| Germany, | ||
| Argentina, | ||
| Australia, | ||
| Belize, | ||
| Brazil, | ||
| Liechtenstein, | ||
| Luxembourg, | ||
| Switzerland, | ||
| Bolivia, | ||
| Canada, | ||
| Caribbean, | ||
| Chile, | ||
| Colombia, | ||
| CostaRica, | ||
| DominicanRepublic, | ||
| Ecuador, | ||
| ElSalvador, | ||
| Finland, | ||
| Guatemala, | ||
| Honduras, | ||
| Ireland, | ||
| Romania, | ||
| Jamaica, | ||
| Mexico, | ||
| NewZealand, | ||
| Nicaragua, | ||
| Panama, | ||
| Paraguay, | ||
| Peru, | ||
| Philippines, | ||
| Portugal, | ||
| PuertoRico, | ||
| SouthAfrica, | ||
| Spain, | ||
| Austria, | ||
| TrinidadAndTobago, | ||
| UnitedKingdom, | ||
| UnitedStates, | ||
| Uruguay, | ||
| Venezuela, | ||
| Zimbabwe | ||
| ; | ||
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| companion object { | ||
| fun fromString(input: String): Locale? = when (input.toUpperCase()) { | ||
| "AR" -> Argentina | ||
| "LU" -> Luxembourg | ||
| "AU" -> Australia | ||
| "BO" -> Bolivia | ||
| "BR" -> Brazil | ||
| "RO" -> Romania | ||
| "BZ" -> Belize | ||
| "CA" -> Canada | ||
| "CB" -> Caribbean | ||
| "CL" -> Chile | ||
| "CO" -> Colombia | ||
| "CR" -> CostaRica | ||
| "DO" -> DominicanRepublic | ||
| "EC" -> Ecuador | ||
| "ES" -> Spain | ||
| "GB" -> UnitedKingdom | ||
| "GT" -> Guatemala | ||
| "FI" -> Finland | ||
| "HN" -> Honduras | ||
| "IE" -> Ireland | ||
| "JM" -> Jamaica | ||
| "MX" -> Mexico | ||
| "NI" -> Nicaragua | ||
| "NZ" -> NewZealand | ||
| "PA" -> Panama | ||
| "PE" -> Peru | ||
| "PH" -> Philippines | ||
| "PR" -> PuertoRico | ||
| "PT" -> Portugal | ||
| "PY" -> Paraguay | ||
| "SV" -> ElSalvador | ||
| "TT" -> TrinidadAndTobago | ||
| "US" -> UnitedStates | ||
| "DE" -> Germany | ||
| "LI" -> Liechtenstein | ||
| "UY" -> Uruguay | ||
| "VE" -> Venezuela | ||
| "ZA" -> SouthAfrica | ||
| "ZW" -> Zimbabwe | ||
| "AT" -> Austria | ||
| "CH" -> Switzerland | ||
| else -> null | ||
| } | ||
| } | ||
| } | ||
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| enum class AvailableLang { | ||
| Spanish, | ||
| English | ||
| } | ||
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| fun Request.lang(): AvailableLang { | ||
| val availableLangs = listOf( | ||
| Lang.Spanish(), | ||
| Lang.English() | ||
| ) | ||
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| return when (this.negotiate.acceptableLanguage(availableLangs)) { | ||
| Lang.English() -> AvailableLang.English | ||
| else -> AvailableLang.Spanish | ||
| } | ||
| } | ||
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| fun main(args: Array<String>) { | ||
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| //val neg = Negotiator(Request.toy(headers = mutableListOf(Header.AcceptLanguage to "en-US, es"))) | ||
| val req = Request.toy(headers = mutableListOf(Header.AcceptLanguage to "es, en-US, es")) | ||
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| println(req.lang()) | ||
| } |
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