prosody-modules
281a864e7472
mod_pubsub_feeds/feeds.lib.lua

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mod_pubsub_feeds/feeds.lib.lua @ 4282:281a864e7472

mod_pubsub_feeds: Don't skip publishing items after an existing one I encountered a feed which was backwards, such that older entries were considered first and then it would skip newer entries. This may however run into trouble if the feed contains more items than what's persisted in pubsub.
author Kim Alvefur <zash@zash.se>
date Mon, 30 Nov 2020 15:17:29 +0100
parent 2378:649f733aa3dc
child 4427:c402b273f2e3
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b149ea428b81 mod_pubsub_feeds: Switch to use util.xml for parsing feeds and include RSS to Atom translation code from lua-feeds
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1 local st = require "util.stanza";
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2 -- RSS->Atom translator
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3 -- http://code.matthewwild.co.uk/lua-feeds/
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4
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5 -- Helpers to translate item child elements
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6 local rss2atom = {};
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7 function rss2atom.title(atom_entry, tag)
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8 atom_entry:tag("title"):text(tag:get_text()):up();
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9 end
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10
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11 function rss2atom.link(atom_entry, tag)
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12 atom_entry:tag("link", { href = tag:get_text() }):up();
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13 end
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15 function rss2atom.author(atom_entry, tag)
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16 atom_entry:tag("author")
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17 :tag("email"):text(tag:get_text()):up()
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18 :up();
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19 end
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21 function rss2atom.guid(atom_entry, tag)
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22 atom_entry:tag("id"):text(tag:get_text()):up();
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23 end
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25 function rss2atom.category(atom_entry, tag)
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26 atom_entry:tag("category", { term = tag:get_text(), scheme = tag.attr.domain }):up();
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27 end
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29 function rss2atom.description(atom_entry, tag)
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30 atom_entry:tag("summary"):text(tag:get_text()):up();
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31 end
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33 local months = {
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34 jan = "01", feb = "02", mar = "03", apr = "04", may = "05", jun = "06";
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35 jul = "07", aug = "08", sep = "09", oct = "10", nov = "11", dec = "12";
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36 };
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37
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38 function rss2atom.pubDate(atom_entry, tag)
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39 local pubdate = tag:get_text():gsub("^%a+,", ""):gsub("^%s*", "");
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40 local date, month, year, hour, minute, second, zone =
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41 pubdate:match("^(%d%d?) (%a+) (%d+) (%d+):(%d+):?(%d*) ?(.*)$");
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42 if not date then return; end
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43 if #date == 1 then
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44 date = "0"..date;
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45 end
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46 month = months[month:sub(1,3):lower()];
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47 if #year == 2 then -- GAH!
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48 if tonumber(year) > 80 then
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49 year = "19"..year;
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50 else
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51 year = "20"..year;
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52 end
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53 end
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54 if zone == "UT" or zone == "GMT" then zone = "Z"; end
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55 if #second == 0 then
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56 second = "00";
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57 end
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58 local date_string = string.format("%s-%s-%sT%s:%s:%s%s", year, month, date, hour, minute, second, zone);
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59 atom_entry:tag("published"):text(date_string):up();
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60 end
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61
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62 -- Translate a single item to atom
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63 local function translate_rss(rss_feed)
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64 local feed = st.stanza("feed", { xmlns = "http://www.w3.org/2005/Atom" });
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65 local channel = rss_feed:get_child("channel");
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66 -- TODO channel properties
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67 for item in channel:childtags("item") do
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68 feed:tag("entry");
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69 for tag in item:childtags() do
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70 local translator = rss2atom[tag.name];
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71 if translator then
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72 translator(feed, tag);
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73 end
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74 end
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75 feed:reset();
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76 end
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77 return feed;
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78 end
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79
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80 return { translate_rss = translate_rss }