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107 lines
2.9 KiB
Lua
107 lines
2.9 KiB
Lua
--[[--
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This module translates text using Google Translate.
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<http://translate.google.com/translate_a/t?client=z&ie=UTF-8&oe=UTF-8&hl=en&tl=en&text=hello>
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--]]
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local JSON = require("json")
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local logger = require("logger")
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local Translator = {
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trans_servers = {
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"http://translate.google.cn",
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"http://translate.google.com",
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},
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trans_path = "/translate_a/t",
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trans_params = {
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client = "z", -- client z returns normal JSON result
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ie = "UTF-8",
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oe = "UTF-8",
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hl = "en",
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tl = "en",
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sl = nil, -- we don't specify source languagae to detect language
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},
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default_lang = "en",
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}
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function Translator:getTransServer()
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return G_reader_settings:readSetting("trans_server") or self.trans_servers[1]
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end
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--[[--
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Returns decoded JSON table from translate server.
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@string target_lang
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@string source_lang
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@string text
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@treturn string result, or nil
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--]]
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function Translator:loadPage(target_lang, source_lang, text)
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local socket = require('socket')
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local url = require('socket.url')
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local http = require('socket.http')
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local https = require('ssl.https')
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local ltn12 = require('ltn12')
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local request, sink = {}, {}
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local query = ""
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self.trans_params.tl = target_lang
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self.trans_params.sl = source_lang
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for k,v in pairs(self.trans_params) do
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query = query .. k .. '=' .. v .. '&'
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end
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local parsed = url.parse(self:getTransServer())
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parsed.path = self.trans_path
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parsed.query = query .. "text=" .. url.escape(text)
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-- HTTP request
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request['url'] = url.build(parsed)
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request['method'] = 'GET'
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request['sink'] = ltn12.sink.table(sink)
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http.TIMEOUT, https.TIMEOUT = 10, 10
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local httpRequest = parsed.scheme == 'http' and http.request or https.request
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-- first argument returned by skip is code
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local _, headers, status = socket.skip(1, httpRequest(request))
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-- raise error message when network is unavailable
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if headers == nil then
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error("Network is unreachable")
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end
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if status ~= "HTTP/1.1 200 OK" then
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logger.warn("translator HTTP status not okay:", status)
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return
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end
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local content = table.concat(sink)
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if content ~= "" and string.sub(content, 1,1) == "{" then
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local ok, result = pcall(JSON.decode, content)
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if ok and result then
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return result
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else
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logger.warn("translator error:", result)
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end
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else
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logger.warn("not JSON in translator response:", content)
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end
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end
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--[[--
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Tries to automatically detect language of `text`.
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@string text
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@treturn string lang (`"en"`, `"fr"`, `…`)
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--]]
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function Translator:detect(text)
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local result = self:loadPage("en", nil, text)
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if result then
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local src_lang = result.src
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logger.dbg("detected language:", src_lang)
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return src_lang
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else
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return self.default_lang
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end
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end
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return Translator
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