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annotate mod_http_upload_external/mod_http_upload_external.lua @ 2332:c2cf5b40b66d

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mod_http_upload_external: Variant of mod_http_upload that delegates HTTP handling to other server using signed URLs
author Kim Alvefur <zash@zash.se>
date Thu, 13 Oct 2016 18:57:15 +0200
parents
children d6badf56ab5f
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2332
c2cf5b40b66d mod_http_upload_external: Variant of mod_http_upload that delegates HTTP handling to other server using signed URLs
Kim Alvefur <zash@zash.se>
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1 -- mod_http_upload_external
c2cf5b40b66d mod_http_upload_external: Variant of mod_http_upload that delegates HTTP handling to other server using signed URLs
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2 --
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3 -- Copyright (C) 2015-2016 Kim Alvefur
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4 --
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5 -- This file is MIT/X11 licensed.
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6 --
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7
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8 -- imports
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9 local st = require"util.stanza";
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10 local uuid = require"util.uuid".generate;
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11 local http = require "util.http";
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12 local dataform = require "util.dataforms".new;
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13 local HMAC = require "util.hashes".hmac_sha256;
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14
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15 -- config
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16 local file_size_limit = module:get_option_number(module.name .. "_file_size_limit", 100 * 1024 * 1024); -- 100 MB
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17 local base_url = assert(module:get_option_string(module.name .. "_base_url"), module.name .. "_base_url is a required option");
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18 local secret = assert(module:get_option_string(module.name .. "_secret"), module.name .. "_secret is a required option");
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19
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20 -- depends
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21 module:depends("disco");
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22
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23 -- namespace
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24 local xmlns_http_upload = "urn:xmpp:http:upload";
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25
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26 -- identity and feature advertising
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27 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload"))
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28 module:add_feature(xmlns_http_upload);
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29
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30 module:add_extension(dataform {
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31 { name = "FORM_TYPE", type = "hidden", value = xmlns_http_upload },
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32 { name = "max-file-size", type = "text-single" },
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33 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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34
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35 local function magic_crypto_dust(random, filename, filesize)
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36 local message = string.format("%s/%s %d", random, filename, filesize);
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37 local digest = HMAC(secret, message, true);
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38 random, filename = http.urlencode(random), http.urlencode(filename);
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39 return base_url .. random .. "/" .. filename, "?v=" .. digest;
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40 end
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41
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42 -- hooks
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43 module:hook("iq/host/"..xmlns_http_upload..":request", function (event)
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44 local stanza, origin = event.stanza, event.origin;
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45 local request = stanza.tags[1];
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46 -- local clients only
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47 if origin.type ~= "c2s" then
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48 module:log("debug", "Request for upload slot from a %s", origin.type);
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49 origin.send(st.error_reply(stanza, "cancel", "not-authorized"));
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50 return true;
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51 end
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52 -- validate
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53 local filename = request:get_child_text("filename");
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54 if not filename or filename:find("/") then
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55 module:log("debug", "Filename %q not allowed", filename or "");
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56 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename"));
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57 return true;
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58 end
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59 local filesize = tonumber(request:get_child_text("size"));
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60 if not filesize then
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61 module:log("debug", "Missing file size");
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62 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size"));
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63 return true;
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64 elseif filesize > file_size_limit then
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65 module:log("debug", "File too large (%d > %d)", filesize, file_size_limit);
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66 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large",
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67 st.stanza("file-too-large", {xmlns=xmlns_http_upload})
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68 :tag("max-size"):text(tostring(file_size_limit))));
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69 return true;
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70 end
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71 local reply = st.reply(stanza);
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72 reply:tag("slot", { xmlns = xmlns_http_upload });
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73 local random = uuid();
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74 local get_url, verify = magic_crypto_dust(random, filename, filesize);
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75 reply:tag("get"):text(get_url):up();
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76 reply:tag("put"):text(get_url .. verify):up();
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77 module:log("info", "Handed out upload slot %s to %s@%s", get_url, origin.username, origin.host);
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78 origin.send(reply);
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79 return true;
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80 end);