mirror of
https://github.com/koreader/koreader
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83a2965d6b
Making sure we get the relevant information in the logs, and that the UI feedback (if any), is meaningful and readable.
51 lines
1.9 KiB
Lua
51 lines
1.9 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 or code)
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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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logger.dbg("InternalDownloadBackend: Unhandled response status:", status or code)
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logger.dbg("InternalDownloadBackend: Response headers:", headers)
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error("InternalDownloadBackend: Don't know how to handle HTTP response status:", status or code)
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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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if file then
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file:write(response)
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file:close()
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end
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end
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return InternalDownloadBackend
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