mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-07-01 10:59:46 +02:00
102 lines
3.1 KiB
Lua
102 lines
3.1 KiB
Lua
-----------------------------------------------------------------------------
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-- Little program that checks links in HTML files
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-- LuaSocket sample files
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-- Author: Diego Nehab
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-- RCS ID: $Id$
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-----------------------------------------------------------------------------
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socket.http.TIMEOUT = 10
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cache = {}
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function readfile(path)
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path = socket.code.unescape(path)
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local file, error = openfile(path, "r")
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if file then
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local body = read(file, "*a")
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closefile(file)
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return body
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else return nil, error end
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end
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function getstatus(url)
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local parsed = socket.url.parse(url, { scheme = "file" })
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if cache[url] then return cache[url] end
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local res
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if parsed.scheme == "http" then
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local request = { url = url }
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local response = { body_cb = function(chunk, err)
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return nil
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end }
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local blocksize = socket.http.BLOCKSIZE
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socket.http.BLOCKSIZE = 1
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response = socket.http.request_cb(request, response)
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socket.http.BLOCKSIZE = blocksize
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if response.code == 200 then res = nil
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else res = response.status or response.error end
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elseif parsed.scheme == "file" then
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local file, error = openfile(Code.unescape(parsed.path), "r")
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if file then
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closefile(file)
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res = nil
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else res = error end
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else res = string.format("unhandled scheme '%s'", parsed.scheme) end
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cache[url] = res
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return res
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end
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function retrieve(url)
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local parsed = socket.url.parse(url, { scheme = "file" })
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local base, body, error
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base = url
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if parsed.scheme == "http" then
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local response = socket.http.request{url = url}
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if response.code ~= 200 then
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error = response.status or response.error
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else
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base = response.headers.location or url
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body = response.body
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end
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elseif parsed.scheme == "file" then
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body, error = readfile(parsed.path)
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else error = string.format("unhandled scheme '%s'", parsed.scheme) end
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return base, body, error
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end
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function getlinks(body, base)
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-- get rid of comments
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body = string.gsub(body, "%<%!%-%-.-%-%-%>", "")
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local links = {}
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-- extract links
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string.gsub(body, '[Hh][Rr][Ee][Ff]%s*=%s*"([^"]*)"', function(href)
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table.insert(links, socket.url.absolute(base, href))
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end)
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string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*'([^']*)'", function(href)
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table.insert(links, socket.url.absolute(base, href))
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end)
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string.gsub(body, "[Hh][Rr][Ee][Ff]%s*=%s*(%a+)", function(href)
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table.insert(links, socket.url.absolute(base, href))
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end)
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return links
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end
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function checklinks(url)
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local base, body, error = retrieve(url)
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if not body then print(error) return end
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local links = getlinks(body, base)
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for _, l in ipairs(links) do
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io.stderr:write("\t", l, "\n")
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local err = getstatus(l)
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if err then io.stderr:write('\t', l, ": ", err, "\n") end
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end
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end
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arg = arg or {}
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if table.getn(arg) < 1 then
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print("Usage:\n luasocket check-links.lua {<url>}")
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exit()
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end
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for _, a in ipairs(arg) do
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print("Checking ", a)
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checklinks(socket.url.absolute("file:", a))
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end
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