mirror of
https://github.com/koreader/koreader
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2f9db25969
* Add a new socketutil module with a few helper functions that allow us to: * Always use a sane User-Agent (previously, only Wikipedia did so) * Set timeouts in an almost sane manner. Doing it explicitly prevents an interaction with KOSync that does crazy stuff I don't even want to try to understand. * Unified said timeouts based on the request's intended usage (except for Wikipedia, which already had meaningful timeout values). * Stopped using LuaSec directly, LuaSocket defers to LuaSec sanely on its own. Everything now transparently supports HTTPS without code duplication.
47 lines
1.7 KiB
Lua
47 lines
1.7 KiB
Lua
local http = require("socket.http")
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local logger = require("logger")
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local ltn12 = require("ltn12")
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local socket = require("socket")
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local socketutil = require("socketutil")
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local InternalDownloadBackend = {}
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local max_redirects = 5; --prevent infinite redirects
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function InternalDownloadBackend:getResponseAsString(url, redirectCount)
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if not redirectCount then
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redirectCount = 0
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elseif redirectCount == max_redirects then
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error("InternalDownloadBackend: reached max redirects: ", redirectCount)
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end
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logger.dbg("InternalDownloadBackend: url :", url)
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local sink = {}
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socketutil:set_timeout(socketutil.LARGE_BLOCK_TIMEOUT, socketutil.LARGE_TOTAL_TIMEOUT)
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local request = {
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url = url,
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sink = ltn12.sink.table(sink),
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}
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local code, headers, status = socket.skip(1, http.request(request))
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socketutil:reset_timeout()
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if code ~= 200 then
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logger.dbg("InternalDownloadBackend: HTTP response code <> 200. Response status: ", status)
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if code and code > 299 and code < 400 and headers and headers["location"] then -- handle 301, 302...
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local redirected_url = headers["location"]
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logger.dbg("InternalDownloadBackend: Redirecting to url: ", redirected_url)
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return self:getResponseAsString(redirected_url, redirectCount + 1)
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else
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error("InternalDownloadBackend: Don't know how to handle HTTP response status: ", status)
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end
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end
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return table.concat(sink)
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end
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function InternalDownloadBackend:download(url, path)
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local response = self:getResponseAsString(url)
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local file = io.open(path, 'w')
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file:write(response)
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file:close()
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end
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return InternalDownloadBackend
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