mirror of
https://github.com/koreader/koreader
synced 2024-11-18 03:25:46 +00:00
94 lines
2.6 KiB
Lua
94 lines
2.6 KiB
Lua
local JSON = require("json")
|
|
local DEBUG = require("dbg")
|
|
|
|
--[[
|
|
-- Query wikipedia using Wikimedia Web API.
|
|
-- http://en.wikipedia.org/w/api.php?action=query&prop=extracts&format=json&exintro=&explaintext=&redirects=&titles=hello
|
|
--]]
|
|
|
|
local Wikipedia = {
|
|
wiki_server = "https://%s.wikipedia.org",
|
|
wiki_path = "/w/api.php",
|
|
wiki_params = {
|
|
action = "query",
|
|
prop = "extracts",
|
|
format = "json",
|
|
exintro = "",
|
|
explaintext = "",
|
|
redirects = "",
|
|
},
|
|
default_lang = "en",
|
|
}
|
|
|
|
function Wikipedia:getWikiServer(lang)
|
|
return string.format(self.wiki_server, lang or self.default_lang)
|
|
end
|
|
|
|
--[[
|
|
-- return decoded JSON table from Wikipedia
|
|
--]]
|
|
function Wikipedia:loadPage(text, lang, intro, plain)
|
|
local socket = require('socket')
|
|
local url = require('socket.url')
|
|
local http = require('socket.http')
|
|
local https = require('ssl.https')
|
|
local ltn12 = require('ltn12')
|
|
|
|
local request, sink = {}, {}
|
|
local query = ""
|
|
self.wiki_params.exintro = intro and "" or nil
|
|
self.wiki_params.explaintext = plain and "" or nil
|
|
for k,v in pairs(self.wiki_params) do
|
|
query = query .. k .. '=' .. v .. '&'
|
|
end
|
|
local parsed = url.parse(self:getWikiServer(lang))
|
|
parsed.path = self.wiki_path
|
|
parsed.query = query .. "titles=" .. url.escape(text)
|
|
|
|
-- HTTP request
|
|
request['url'] = url.build(parsed)
|
|
request['method'] = 'GET'
|
|
request['sink'] = ltn12.sink.table(sink)
|
|
DEBUG("request", request)
|
|
http.TIMEOUT, https.TIMEOUT = 10, 10
|
|
local httpRequest = parsed.scheme == 'http' and http.request or https.request
|
|
-- first argument returned by skip is code
|
|
local _, headers, status = socket.skip(1, httpRequest(request))
|
|
|
|
-- raise error message when network is unavailable
|
|
if headers == nil then
|
|
error("Network is unreachable")
|
|
end
|
|
|
|
if status ~= "HTTP/1.1 200 OK" then
|
|
DEBUG("HTTP status not okay:", status)
|
|
return
|
|
end
|
|
|
|
local content = table.concat(sink)
|
|
if content ~= "" and string.sub(content, 1,1) == "{" then
|
|
local ok, result = pcall(JSON.decode, content)
|
|
if ok and result then
|
|
DEBUG("wiki result", result)
|
|
return result
|
|
else
|
|
DEBUG("error:", result)
|
|
end
|
|
else
|
|
DEBUG("not JSON:", content)
|
|
end
|
|
end
|
|
|
|
-- extract intro passage in wiki page
|
|
function Wikipedia:wikintro(text, lang)
|
|
local result = self:loadPage(text, lang, true, true)
|
|
if result then
|
|
local query = result.query
|
|
if query then
|
|
return query.pages
|
|
end
|
|
end
|
|
end
|
|
|
|
return Wikipedia
|