Add support for CURLOPT_PROTOCOLS and CURLOPT_REDIR_PROTOCOLS

[FunkyAss]

Add a table named "protocols" in the cURL module. The table is indexed with protocol names (as strings) and protocol values can be used with "bit-oriented" modules such as bit32 for lua 5.2 and lua BitOp for lua 5.1 and luajit.

Adds two functions to the easy handle metatable: setopt_protocols and setopt_redir_protocols. Both the functions accept a number as second argument. The number is a bitmask of protocols and can be be computed from "bit-oriented" modules and cURL.protocols table.

As an usage example:

-- require the right bit module: lua5.2 -> bit32, lua5.1 or luajit: lua BitOp local bit_op = _VERSION == "Lua 5.2" and "bit32" or "bit" local bit = require(bit_op) local curl = require "cURL" local protos = curl.protocols local easy = curl.easy_init() -- follow location headers (redirects) easy:setopt_followlocation(1) -- allow HTTP and HTTPS for requests easy:setopt_protocols(bit.bor(protos.HTTP, protos.HTTPS)) -- but follow redirect to http only easy:setopt_redir_protocols(protos.HTTP) -- http://github.com redirects to https://github.com easy:setopt_url("http://github.com") local success, err = pcall(easy.perform, easy) -- should fail with "https unsupported protocol" io.write("perform: ", tostring(success), '\n', err, '\n') 

Please note that libcurl <= 7.36 can't properly exclude protocols on-top-of-ssl, such as HTTPS, if the ssl-less protocol is among the allowed protocols. This is due a bug in libcurl, solved in curl/curl@710f14e

Should close #6

[msva]

Those values are meant to be used with the bit32 module in lua 5.2 and with Lua BitOp in lua 5.1 and luajit.
AND luajit

Eerm? AFAIK LuaJIT has its own internal "bit" library.
// although, this remark has just cosmetic value. We just need to add it in the documentation, I guess.

[FunkyAss]

--- On 19/05/2014 - 19:39, Vadim A. Misbakh-Soloviov wrote:

Those values are meant to be used with the bit32 module in lua 5.2 and with Lua BitOp in lua 5.1 and luajit.
AND luajit

Eerm? AFAIK LuaJIT has its own internal "bit" library.
// although, this remark has just cosmetic value. We just need to add it in the documentation, I guess.

---

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#9 (comment)
--- end quoted text ---

The luajit internal bit module is indeed lua BitOp.

I'm replying to this through my mail client; honestly, I don't know how
it will display or what it will do to the issue (if it will be reopened
or what): in any case, sorry about that :)