File

mod_http_pep_avatar/mod_http_pep_avatar.lua @ 4989:b74d592df9e2

mod_http_muc_log: Remove dead code This might be something left over since a different variant where the loop went like `for n = i-1, i-100, -1 do ... end` i.e. it went trough a fixed number of items instead of all the page until the current message. Then it would have needed something to stop going over the end, but since the checks are simple it shouldn't be much of a problem looping over even a very busy day.
author Kim Alvefur <zash@zash.se>
date Tue, 16 Aug 2022 01:27:59 +0200
parent 4038:02d238799537
line wrap: on
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-- HTTP Access to PEP Avatar
-- By Kim Alvefur <zash@zash.se>

local mod_pep = module:depends"pep";

local um = require "core.usermanager";
local nodeprep = require "util.encodings".stringprep.nodeprep;
local base64_decode = require "util.encodings".base64.decode;
local urlencode = require "util.http".urlencode;

module:depends("http")
module:provides("http", {
	route = {
		["GET /*"] = function (event, path)
			if path == "" then
				return [[<h1>Hello from mod_http_pep_avatar</h1><p>This module provides access to public avatars of local users.</p>]];
			end;

			local request, response = event.request, event.response;
			local actor = request.ip;

			local user, item_id = path:match("^([^/]+)/(%x+)$");
			if not user then user = path; end
			local prepped = nodeprep(user);
			if not prepped then return 400; end
			if prepped ~= user then
				response.headers.location = module:http_url() .. "/" .. urlencode(prepped);
				return 302;
			end
			if not um.user_exists(user, module.host) then
				return 404;
			end

			local pep_service = mod_pep.get_pep_service(user);

			local ok, avatar_hash, avatar_meta = pep_service:get_last_item("urn:xmpp:avatar:metadata", actor);

			if not ok or not avatar_hash then
				return 404;
			end

			if (item_id or avatar_hash) == request.headers.if_none_match then
				return 304;
			end

			local data_ok, avatar_data = pep_service:get_items("urn:xmpp:avatar:data", actor, item_id or avatar_hash);
			if not data_ok or type(avatar_data) ~= "table" or not avatar_data[item_id or avatar_hash] then
				return 404;
			end

			local info = avatar_meta.tags[1]:get_child("info");
			if item_id and info.attr.id ~= item_id then
				info = nil;
				for altinfo in avatar_meta.tags[1]:childtags("info") do
					if altinfo.attr.id == item_id then
						info = altinfo;
					end
				end
			end

			if not info then
				return 404;
			end

			response.headers.etag = item_id or avatar_hash;

			response.headers.content_type = info and info.attr.type or "application/octet-stream";

			local data = avatar_data[item_id or avatar_hash];
			return base64_decode(data.tags[1]:get_text());
		end;
	}
});