mirror of
https://github.com/koreader/koreader
synced 2024-11-16 06:12:56 +00:00
86 lines
2.4 KiB
Lua
86 lines
2.4 KiB
Lua
local JSON = require("JSON")
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local DEBUG = require("dbg")
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--[[
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-- Query wikipedia using Wikimedia Web API.
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-- http://en.wikipedia.org/w/api.php?action=query&prop=extracts&format=json&exintro=&explaintext=&redirects=&titles=hello
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--]]
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local Wikipedia = {
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wiki_server = "http://%s.wikipedia.org",
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wiki_path = "/w/api.php",
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wiki_params = {
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action = "query",
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prop = "extracts",
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format = "json",
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exintro = "",
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explaintext = "",
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redirects = "",
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},
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default_lang = "en",
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}
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function Wikipedia:getWikiServer(lang)
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return string.format(self.wiki_server, lang or self.default_lang)
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end
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--[[
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-- return decoded JSON table from Wikipedia
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--]]
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function Wikipedia:loadPage(text, lang, intro, plain)
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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.wiki_params.exintro = intro and "" or nil
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self.wiki_params.explaintext = plain and "" or nil
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for k,v in pairs(self.wiki_params) do
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query = query .. k .. '=' .. v .. '&'
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end
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local parsed = url.parse(self:getWikiServer(lang))
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parsed.path = self.wiki_path
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parsed.query = query .. "titles=" .. 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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DEBUG("request", request)
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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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local code, 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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local content = table.concat(sink)
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if content ~= "" then
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local ok, result = pcall(JSON.decode, JSON, content)
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if ok and result then
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DEBUG("wiki result", result)
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return result
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else
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DEBUG("error:", result)
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end
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end
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end
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-- extract intro passage in wiki page
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function Wikipedia:wikintro(text, lang)
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local result = self:loadPage(text, lang, true, true)
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if result then
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local query = result.query
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if query then
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return query.pages
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end
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end
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end
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return Wikipedia
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