mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-07-01 10:59:46 +02:00
96 lines
2.8 KiB
Lua
96 lines
2.8 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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require"http"
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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.url.unescape(path)
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local file, error = io.open(path, "r")
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if file then
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local body = file:read("*a")
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file:close()
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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, method = "HEAD" }
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local response = socket.http.request(request)
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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 = io.open(socket.url.unescape(parsed.path), "r")
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if file then
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file:close()
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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 body, headers, code, error
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local base = url
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if parsed.scheme == "http" then
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body, headers, code, error = socket.http.get(url)
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if code == 200 then
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base = base or headers.location
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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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body = 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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body = 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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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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