100 lines
2.6 KiB
Lua
100 lines
2.6 KiB
Lua
-- $NetBSD: printenv.lua,v 1.5 2021/02/28 16:10:00 rillig Exp $
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-- this small Lua script demonstrates the use of Lua in (bozo)httpd
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-- it will simply output the "environment"
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-- Keep in mind that bozohttpd forks for each request when started in
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-- daemon mode, you can set global variables here, but they will have
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-- the same value on each invocation. You can not keep state between
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-- two calls.
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-- You can test this example by running the following command:
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-- /usr/libexec/httpd -b -f -I 8080 -L test printenv.lua .
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-- and then navigate to: http://127.0.0.1:8080/test/printenv
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local httpd = require 'httpd'
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function escape_html(s)
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return s:gsub('&', '&'):gsub('<', '<'):gsub('>', '>'):gsub('"', '"')
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end
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function printenv(env, headers, query)
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-- we get the "environment" in the env table, the values are more
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-- or less the same as the variable for a CGI program
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-- output headers using httpd.write()
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-- httpd.write() will not append newlines
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httpd.write("HTTP/1.1 200 Ok\r\n")
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httpd.write("Content-Type: text/html\r\n\r\n")
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-- output html using httpd.print()
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-- you can also use print() and io.write() but they will not work with SSL
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httpd.print([[
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<html>
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<head>
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<title>Bozotic Lua Environment</title>
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</head>
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<body>
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<h1>Bozotic Lua Environment</h1>
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]])
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httpd.print('module version: ' .. httpd._VERSION .. '<br>')
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httpd.print('<h2>Server Environment</h2>')
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-- print the list of "environment" variables
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for k, v in pairs(env) do
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httpd.print(escape_html(k) .. '=' .. escape_html(v) .. '<br/>')
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end
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httpd.print('<h2>Request Headers</h2>')
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for k, v in pairs(headers) do
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httpd.print(escape_html(k) .. '=' .. escape_html(v) .. '<br/>')
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end
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if query ~= nil then
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httpd.print('<h2>Query Variables</h2>')
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for k, v in pairs(query) do
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httpd.print(escape_html(k) .. '=' .. escape_html(v) .. '<br/>')
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end
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end
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httpd.print('<h2>Form Test</h2>')
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httpd.print([[
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<form method="POST" action="form?sender=me">
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<input type="text" name="a_value">
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<input type="submit">
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</form>
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]])
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-- output a footer
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httpd.print([[
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</body>
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</html>
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]])
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end
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function form(env, header, query)
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httpd.write("HTTP/1.1 200 Ok\r\n")
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httpd.write("Content-Type: text/html\r\n\r\n")
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if query ~= nil then
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httpd.print('<h2>Form Variables</h2>')
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if env.CONTENT_TYPE ~= nil then
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httpd.print('Content-type: ' .. env.CONTENT_TYPE .. '<br>')
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end
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for k, v in pairs(query) do
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httpd.print(escape_html(k) .. '=' .. escape_html(v) .. '<br/>')
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end
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else
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httpd.print('No values')
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end
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end
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-- register this handler for http://<hostname>/<prefix>/printenv
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httpd.register_handler('printenv', printenv)
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httpd.register_handler('form', form)
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