OC-PsychOS2/lib/download.lua

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local net = require "minitel"
local dl = {}
dl.protos = {}
-- Stolen from the old exec/fget
local function parseURL(url)
local proto,addr = url:match("(.-)://(.+)")
addr = addr or url
local hp, path = addr:match("(.-)(/.*)")
hp, path = hp or addr, path or "/"
local host, port = hp:match("(.+):(.+)")
host = host or hp
return proto, host, port, path
end
function dl.protos.fget(host, optPort, path, dest) -- string string string number -- boolean -- Downloads path from host (on optPort or 70), printing the directory listing, or saving the file to dest.
local socket = assert(net.open(host, optPort or 70))
socket:write(string.format("t%s\n", path))
local status
repeat
coroutine.yield()
status = socket:read(1)
until status ~= ""
if status == "d" then
io.write("Directory Listing:\n")
local tmp = ""
repeat
coroutine.yield()
tmp = socket:read("*a")
io.write(tmp)
until socket.state == "closed" and tmp == ""
return true
elseif status == "y" then
if not dest then
error("Must provide local path to save remote files.")
end
io.write(string.format("Saving %s to %s...\n", path, dest))
local f = assert(io.open(dest, "wb"))
local tmp = ""
repeat
coroutine.yield()
tmp = socket:read("*a")
f:write(tmp)
until socket.state == "closed" and tmp == ""
f:close()
print("Done.")
return true
else
local err, tmp = "", ""
repeat
coroutine.yield()
tmp = socket:read("*a")
err = err .. tmp
until socket.state == "closed" and tmp == ""
error(string.format("Got error from remote host: %s", err))
end
end
function dl.protos.http(host, optPort, path, dest, url) -- string string string number -- boolean -- Downloads *url* to *dest* via the internet card, if available.
if not component.list("internet")() then
local proto,host,sPort,path = parseURL(url)
local proxy = os.getenv(proto:upper().."_PROXY")
if not proxy and fs.exists("/boot/cfg/"..proto.."_proxy") then
local f = io.open("/boot/cfg/"..proto.."_proxy","rb")
proxy = f:read()
f:close()
end
if not proxy then error("No internet card or HTTP(S) proxy available") end
print("Internet card unavailable, falling back to proxy "..proxy)
if optPort then host=string.format("%s:%i",host,optPort) end
return dl.wget(string.format("%s/%s%s",proxy,host,path),dest)
end
if not dest then
error("Must provide local path to save remote files.")
end
local R,r=component.invoke(component.list("internet")(),"request",url)
if not R then error(r) end
repeat
coroutine.yield()
until R.finishConnect()
local code, messsage, headers
repeat
coroutine.yield()
code, message, headers = R.response()
until code or message
if code > 299 or code < 200 then
return false, code, message
end
local f=io.open(dest,"wb")
if not f then error("Unable to open file "..dest) end
io.write(string.format("Saving %s to %s...\n", url, dest))
repeat
coroutine.yield()
ns = R.read()
f:write(ns or "")
until not ns
f:close()
print("Done.")
return true
end
dl.protos.https = dl.protos.http
function dl.wget(remotePath, dest) -- string string -- -- Downloads from remote *remotePath* to *dest*
local proto, host, sPort, path = parseURL(remotePath)
if dl.protos[proto] then
local port
if sPort then
port = tonumber(sPort)
end
dl.protos[proto](host, port, path, dest, remotePath)
else
error("Unsupported protocol: " .. tostring(proto))
end
end
return setmetatable(dl,{__call=function(_,path,dest) return dl.wget(path,dest) end})