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[TheFreeNetwork] Add Readme

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Improve script fix_duplicates.php's comments
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Diogo Cordeiro 2020-08-04 05:10:11 +01:00
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31
modules/TheFreeNetwork/README.md Normal file
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@ -0,0 +1,31 @@
TheFreeNetwork allows GNU social to handle more than one Federation protocol simultaneously.
Making this possible essentially consists in not allowing duplication of remote profiles in the profile table,
and to ensure that each profile is handled by one and only one federation protocol at a time.
Each newly added federation protocol **must** support all the already supported functionalities by the other federation
protocols, otherwise this module will be moving between FullFeaturedFederationProtocolProfile and LackyFederationProtocolProfile all the time.
You **must** feed this Module with the list of preferences for each federation protocol, more on that in the following section.
Settings
========
You can change these settings in `config.php` with `$config['TheFreeNetworkModule'][{setting name}] = {new setting value};`.
Default values in parenthesis.
protocols (`['ActivityPub' => 'Activitypub_profile', 'OStatus' => 'Ostatus_profile']`):
This array follows the following structure:
`['{PluginName}' => '{Actor_representation_class_name}'`, the latter is the class used to represent the remote profile in
the context of the federation plugin.
N.B.: Higher Priority/Preference is given to the first entry. I.e., the default value gives preference to ActivityPub over OStatus.
Scripts
=======
`./fix_duplicates.php` : Run this script if you have duplicated profiles due to federation issues.
For example, if both ActivityPub and OStatus created different profile entries for the same remote actor. That's something
that shouldn't thank to this module, but if something goes very wrong, there's this script.

30
modules/TheFreeNetwork/scripts/fix_duplicates.php
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@ -41,11 +41,15 @@ require_once INSTALLDIR . '/scripts/commandline.inc';
/**
* Remote profiles are inspected from the most to the least
* relevant according to the protocols they belong.
* Doing so while maintaing a global 'seen' array makes it
* Invariants:
* - `seen_local` array: The most recent profile inside of a certain protocol
* - global `seen` array: The most relevant profile (if there were duplicates, the first protocol of the list is the one to have its profile maintained)
* We do so while maintaining a global 'seen' array makes it
* easy to satisfy a policy of maintaining only the duplicated
* profiles that are either the most relevant or the newest
* ones intra-protocol wise.
*/
function run(): void
{
$protocols = common_config('TheFreeNetworkModule', 'protocols');
@ -73,38 +77,38 @@ function fix_duplicates(string $profile_class, array &$seen): void
$id = $db->profile_id;
$uri = $db->uri;
// have we seen this profile before?
// Have we seen this profile before?
if (array_key_exists($uri, $seen)) {
// yes, mantain previous
// Was it on a previous protocol? Keep the highest preference protocol's one
if ($seen[$uri] !== $id) {
printfv("Deleting Profile with id = {$id}");
printfv("Deleting Profile with id = {$id}\n");
$profile = Profile::getKV('id', $id);
$profile->delete(); // will propagate to federation profile classes
$profile->delete();
} else {
printfv("Deleting {$profile_class} with id = {$id}");
printfv("Deleting {$profile_class} with id = {$id}\n");
$profile = $profile_class::getKV('profile_id', $id);
$profile->delete();
}
} elseif (array_key_exists($uri, $seen_local)) {
// yes, mantain current
// Was it in this protocol? Delete the older record.
if ($seen_local[$uri] !== $id) {
printfv("Deleting Profile with id = {$id}");
printfv("Deleting Profile with id = {$seen_local[$uri]}\n");
$profile = Profile::getKV('id', $seen_local[$uri]);
$profile->delete(); // will propagate to federation profile classes
$profile->delete();
} else {
printfv("Deleting {$profile_class} with id = {$seen_local[$uri]}");
printfv("Deleting {$profile_class} with id = {$seen_local[$uri]}\n");
$profile = $profile_class::getKV('profile_id', $seen_local[$uri]);
$profile->delete();
}
// Update the profile id for this URI.
$seen_local[$uri] = $id;
} else {
// no, save it
// It's the first time we see this profile _inside_ this protocol!
$seen_local[$uri] = $id;
}
}
// save valid local profiles
// Merge the findings inside this protocol with the global seen to be used on the next protocol of the list.
$seen = array_merge($seen, $seen_local);
}