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author | Goffi <goffi@goffi.org> |
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date | Thu, 14 Jul 2022 12:55:30 +0200 |
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3678 | 1 .. _components: |
2 | |
3 =================== | |
4 Libervia Components | |
5 =================== | |
6 | |
7 Libervia can act as an XMPP server component, which can be seen as a generic plugin for | |
8 XMPP servers. | |
9 | |
10 This page explains which components are available and how to use them. | |
11 | |
12 Running a component | |
13 =================== | |
14 | |
15 Components are linked to a Libervia profile in the same way as normal clients. | |
16 | |
17 To run a component, you'll need to know its *entry point*, which is the name of the import | |
18 name of plugin managing it. The entry point to use will be specified in the component | |
19 installation documentation. | |
20 | |
21 You'll also have to declare the component on your XMPP server, this is a server dependent | |
22 step and you'll have to check your server documentation for details. You'll have to | |
23 specify a **shared secret** (can also be named simply *password*) that must be set both on | |
24 the XMPP server and as the XMPP password of the Libervia profile. | |
25 | |
26 Here is a list of relevant documentation for most common servers: | |
27 | |
28 ejabberd | |
29 https://docs.ejabberd.im/admin/configuration/listen-options/ | |
30 | |
31 MongooseIm | |
32 https://esl.github.io/MongooseDocs/latest/configuration/listen/#xmpp-components-listenservice | |
33 | |
34 OpenFire | |
35 use the web-based admin panel | |
36 | |
37 Prosody | |
38 https://prosody.im/doc/components | |
39 | |
40 Tigase | |
41 https://docs.tigase.net/tigase-server/stable-snapshot/Administration_Guide/webhelp/externalComponentConfiguration.html | |
42 | |
43 | |
44 On Libervia, setup is done with Libervia CLI's :ref:`profile create <li_profile_create>` | |
45 command. | |
46 | |
47 You'll usually want to have the component to start automatically when the backend | |
48 is started, for this you must unset the profile password (not to be confused with the XMPP | |
49 password which is the one also set on the server configuration) with ``-p ""`` and set | |
50 auto-connection with ``-A``. | |
51 | |
52 You'll specify the XMPP password (also named *shared secret* in `XEP-0144`_ terminology) | |
53 with ``-x <your_shared_secret>`` and the JID to use with ``-j | |
54 <component_subdomain>.<server.tld>``. | |
55 | |
56 The component entry point is specified with ``-C <entry_point>``. | |
57 | |
58 .. _XEP-0144: https://xmpp.org/extensions/xep-0114.html | |
59 | |
60 example | |
61 ------- | |
62 | |
63 Louise wants to run an ActivityPub gateway on her server ``example.org`` with the JID | |
64 ``ap.example.org``. The shared secret is ``xmpp_rocks`` and she wants the component to | |
65 start automatically with the backend, thus she doesn't set a profile password. The | |
66 entry-point for ActivityPub component is ``ap-gateway``, and she wants to use the same | |
67 name for the profile. To do this, she enters the following command:: | |
68 | |
69 $ li profile create ap-gateway -j ap.example.org -p "" -x xmpp_rocks -C ap-gateway -A | |
70 | |
71 The component will then be started next time Libervia Backend is launched. If Louise | |
72 wants to connect it immediately, she can use:: | |
73 | |
74 $ li profile connect -cp ap-gateway | |
75 | |
76 Available Components | |
77 ==================== | |
78 | |
79 Below is a list of currently available components in Libervia, and instructions on what | |
80 they do and how to use them. | |
81 | |
82 | |
83 File Sharing | |
84 ------------ | |
85 | |
86 **entry_point:** ``file-sharing`` | |
87 | |
88 File Sharing component manage the hosting of user files. Users can upload file there using | |
89 either `Jingle File Transfer`_ or `HTTP File Upload`_. | |
90 | |
91 There is no limit to the size of files which can be uploaded, but administrators can set a | |
92 quota to limit the space that can be used. | |
93 | |
94 Files can be retrieved using `File Information Sharing`_, and deleted using `Ad-Hoc Commands`_. | |
95 | |
96 Files can be shared with a public HTTP link, or made available only to a specified list of | |
97 entities (JIDs). Permissions can be set through Ad-Hoc Commands. | |
98 | |
99 .. _Jingle File Transfer: https://xmpp.org/extensions/ | |
100 .. _HTTP File Upload: https://xmpp.org/extensions/xep-0363.html | |
101 .. _File Information Sharing: https://xmpp.org/extensions/xep-0329.html | |
102 .. _Ad-Hoc Commands: https://xmpp.org/extensions/xep-0050.html | |
103 | |
104 Configuration | |
105 ~~~~~~~~~~~~~ | |
106 | |
107 All options are to be set in ``[component file-sharing]`` section. | |
108 | |
109 ``http_upload_port`` | |
110 port to use for HTTP File Upload | |
111 | |
112 **default**: 8888 | |
113 | |
114 ``http_upload_connection_type`` | |
115 either ``http`` or ``https``. | |
116 | |
117 **default**: ``https`` | |
118 | |
119 Note that HTTP Upload should always be ``https`` to end-user, the ``http`` option is to | |
120 be used only if you use a HTTP server as a proxy, and this server is already set for | |
121 TLS. | |
122 | |
123 ``http_upload_public_facing_url`` | |
124 must be set to the URL that end-user will see. Notably useful if the component is behind | |
125 a proxy. | |
126 | |
127 **default**: ``https://<component host>:<http_upload_port`` | |
128 | |
129 ``quotas_json`` | |
130 a JSON object indicating quotas to use for users. The object can have 3 keys: | |
131 | |
132 ``admins`` | |
133 quotas to use for administrators (i.e. profiles set in ``admins_list``) | |
134 | |
135 ``users`` | |
136 quotas to use for normal users (i.e. non admin profiles) | |
137 | |
138 ``jids`` | |
139 per-jid specific quotas. The value is a JSON object where key is a user bare jid and | |
140 value is a quota. | |
141 | |
142 Quotas can be either ``null`` for unlimited space, or a size value (`SI prefixes and | |
143 binary prefixes`_ can be used). | |
144 | |
145 example:: | |
146 | |
147 quotas_json = { | |
148 "admins": null, | |
149 "users": "50 Mio", | |
150 "jids": {"pierre@example.org": "1 Gio"} | |
151 } | |
152 | |
153 .. _SI prefixes and binary prefixes: https://en.wikipedia.org/wiki/Octet_(computing)#Unit_multiples | |
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154 |
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155 |
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156 ActivityPub Gateway |
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157 ------------------- |
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158 |
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159 **entry_point:** ``ap-gateway`` |
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160 |
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161 .. note:: |
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162 |
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163 this component is currently in active development, and not yet fully functional. This |
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164 documentation will be updated during evolution of component. |
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165 |
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166 You can follow the development by reading `Libervia Progress Notes`_. |
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167 |
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168 .. _Libervia Progress Notes: https://www.goffi.org/tag/Libervia%20progress |
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169 |
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170 This gateway will provide a bidirectional gateway between XMPP and `ActivityPub`_ (or AP |
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171 below). That means that user from XMPP will be able to follow actors or comments messages |
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172 from any software compatible with ActivityPub protocol, and vice versa. |
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173 |
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174 .. _ActivityPub: https://activitypub.rocks/ |
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175 |
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176 .. note:: |
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177 |
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178 this component is mostly tested with Prosody as XMPP server reference, and Mastodon as |
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179 AP server reference, but it should work with any XMPP or AP server. |
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180 |
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181 The component launches a HTTP server (necessary to communicate with AP software). This |
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182 server needs to handle HTTP requests made at paths ``/.well-known/webfinger`` and ``/_ap`` |
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183 (or the ``ap_path`` set in configuration, see below). If the component is not directly |
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184 facing internet (e.g. integrated in an existing website though a proxy), you'll have to |
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185 redirect the requests made to those path to the HTTP server (i.e. to component host at the |
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186 port set at ``http_port``, see configuration below). Please check your HTTP server |
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187 documentation to find how this must be done. |
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188 |
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189 |
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190 Configuration |
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191 ~~~~~~~~~~~~~ |
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192 |
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193 All options are to be set in ``[component ap-gateway]`` section. |
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194 |
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195 ``public_url`` |
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196 Main user-facing domain of the HTTP server, this will be used to construct all AP URLs |
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197 |
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198 **default**: if not set, ``xmpp_domain`` is used. If ``xmpp_domain`` is not set either, |
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199 an error is raised. |
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200 |
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201 ``http_port`` |
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202 port where the HTTP server should listen. Port ``80`` is not used directly as it would |
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203 require root privileges, and it is strongly recommended against launching Libervia under |
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204 a privileged account. An HTTP Proxy or a port redirection should be set to redirect the |
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205 ``80`` port to the port specified here. |
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206 |
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207 **default**: ``8123`` |
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208 |
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209 ``http_connection_type`` |
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210 either ``http`` or ``https``. If you have a HTTP proxy such as Apache or NGINX which |
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211 already handles HTTPS, you may want to use ``http``. |
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212 |
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213 **default**: ``https`` |
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214 |
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215 Note that the HTTP server should always use ``https`` with end-user, the ``http`` option |
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216 is only to be used with an HTTPS proxy. |
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217 |
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218 ``local_only`` |
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219 A boolean value indicating if the gateway is allowed to convert pubsub node from |
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220 external XMPP service or not. A JID is considered external if its domain part doesn't |
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221 end with the gateway's server. For instance, if a gateway ``ap.example.org`` is set on |
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222 the server ``example.org``, the JIDs ``pierre@example.org`` or |
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223 ``some-node@pubsub.example.org`` will be considered local, but |
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224 ``buenaventura@example.net`` won't (note the different domain). |
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225 |
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226 Most of time, ``local_only`` should be used. |
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227 |
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228 **default**: ``true`` |
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229 |
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230 ``ap_path`` |
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231 Path prefix to use for ActivityPub request. It's usually not necessary to change the |
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232 default value. |
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233 |
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234 **default**: ``_ap`` |
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235 |
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236 ``comments_max_depth`` |
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237 An integer value indicating the maximum number of comment nodes that can be created. See |
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238 :ref:`ap-xmpp-threads-conversion` |
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239 |
3838 | 240 ``auto_mentions`` |
241 A boolean value indicating if received XMPP pubsub blog items bodies must be scanned to | |
242 find ``@user@server.tld`` type mentions. If mentions are found, they'll be added to the | |
243 resulting AP items. | |
244 | |
245 **default**: ``true`` | |
246 | |
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247 |
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248 .. _ap-actor-from-xmpp: |
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249 |
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250 How to Address an AP Actor from XMPP |
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251 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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252 |
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253 When addressing an ActivityPub actor from XMPP, you must use a JID corresponding to the |
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254 actor. The domain part of the JID correspond to the gateway JID (the one set in gateway |
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255 profile), while the local part (before the ``@``) is used to specify the AP actor. |
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256 |
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257 `XEP-0106`_ (JID Escaping) is used to indicate the AP actor identifier, thus the ``@`` |
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258 must be escaped with ``\40``. |
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259 |
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260 .. _XEP-0106: JID Escaping |
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261 |
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262 **example** |
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263 |
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264 If Louise wants to talk to Pierre which is on the ``example.net`` AP server, she can use |
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265 her XMPP AP gateway which is at ``ap.example.org``. Pierre AP's actor identifier is |
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266 ``pierre@example.net``, Louise can access it via the JID |
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267 ``pierre\40example.net@ap.example.org`` (we call it *virtual JID* of the AP actor). |
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268 |
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269 Of course, this is a bit cumbersome to do by hand, it is expected that XMPP clients will |
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270 do the (un)escaping automatically for end-user, in a way that Louise could enter |
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271 ``pierre@example.net`` directly, with an indicator to show that this is an ActivityPub |
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272 actor identifier rather than an XMPP JID. |
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273 |
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274 |
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275 .. _xmpp-node-from-ap: |
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276 |
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277 How to Address an XMPP Entity from AP |
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278 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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279 |
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280 To access an XMPP entity, it is a little bit more complicated for 2 reasons: |
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281 |
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282 - XMPP use a wider range of allowed characters than most AP implementations [#AP_chars]_. |
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283 - to get XMPP items, we need 2 data: the entity JID, and a pubsub node |
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284 |
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285 |
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286 However, Libervia AP gateway tries to make it as user friendly as possible, thus it works |
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287 like this: |
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288 |
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289 - in the most common case, one just wants to access the personal blog of a user, and basic |
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290 ASCII characters (with possibly ``-``, ``_`` or ``.``) are used. in this case, the XMPP |
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291 JID can be directly used as AP actor handle |
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292 - when a pubsub node needs to be specified it is most of time with a pubsub JID which has |
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293 not user part (something like ``pubsub.example.org``). In this case, the pubsub node can |
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294 be used as AP actor handle's user part, Libervia will use XMPP discovery to know that |
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295 it's a pubsub service. So if you want to access the blog named ``xmpp_news`` at |
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296 ``pubsub.example.org``, you can use the handle ``xmpp_news@pubsub.example.org`` (be sure |
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297 that the domain ``pubsub.example.org`` links to the Libervia AP gateway HTTP server) |
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298 - if you want to use a specific node with an entity which already has a user part, then a |
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299 special encoding must be used, where ``---`` (three dashes) are used to separate node |
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300 from entity: ``some_node--some_user@example.org`` |
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301 - if you need to use special characters, then you'll have to use ``___`` followed by the |
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302 special encoding (see below). |
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303 |
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304 The encoding is explained in the documentation of the following method: |
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305 |
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306 .. automethod:: sat.plugins.plugin_comp_ap_gateway.APGateway.getJIDAndNode |
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307 |
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308 |
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309 .. [#AP_chars] Most if not all AP implementations use webfinger `acct` URI as a de-facto |
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310 standard to manage user-friendly handles (something like ``user@example.org``). Those |
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311 handles, according to `RFC7565`_, should |
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312 manage a wide variety of characters thanks to the support of percent-encoding. |
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313 |
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314 Unfortunately, at least one of the most-used AP implementation (Mastodon, which is used |
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315 a reference implementation for this gateway), only uses a limited subset of allowed |
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316 characters. In addition, Mastodon needs an associated handle [#m_wf]_ thus an alternate |
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317 way to encode characters had to be found. |
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318 |
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319 An issue has been opened to improve this situation on Mastodon bug tracker: |
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320 https://github.com/mastodon/mastodon/issues/17222 |
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321 |
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322 .. _RFC7565: https://datatracker.ietf.org/doc/html/rfc7565 |
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323 .. [#m_wf] https://docs.joinmastodon.org/spec/webfinger/ |
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324 |
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325 **example** |
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326 |
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327 If Pierre wants to talk to Louise, he can directly use the JID which is the same as the AP |
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328 actor identifier, i.e. ``louise@example.org`` (note that on AP software, a ``@`` prefix is |
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329 often required, thus Pierre will look for ``@louise@example.org``). |
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330 |
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331 .. note:: |
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332 |
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333 The actor endpoint can also be used directly in AP software (in the example above, it |
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334 would be by default ``https://example.org/_ap/actor/louise%40example.org``). |
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335 |
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336 |
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337 Getting AP Message from XMPP |
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338 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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339 |
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340 To retrieve ActivityPub messages of an actor from an XMPP client with blogging |
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341 capabilities (like Libervia or Movim), just use the associated JID as explained in |
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342 :ref:`ap-actor-from-xmpp`. The actor messages (from ``outbox`` collection) should appear |
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343 as regular XMPP blog items. |
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344 |
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345 .. note:: |
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346 |
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347 Due to limitation of `ActivityStream Collection Paging`_, the conversion from XMPP |
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348 `RSM`_ requests is inneficient beyond first or last page. This problem is avoided if |
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349 anybody subscribe to the gateway node (i.e. follow the AP actor), as the collection |
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350 will then be cached, and efficiently delivered. |
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351 |
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352 .. _ActivityStream Collection Paging: https://www.w3.org/TR/activitystreams-core/#h-paging |
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353 .. _RSM: https://xmpp.org/extensions/xep-0059.html |
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354 |
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355 Getting XMPP Items from ActivityPub |
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356 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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357 |
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358 To get XMPP items from an ActivityPub implementation, just use the handle as explained at |
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359 :ref:`xmpp-node-from-ap` (often handle searches are triggered with a ``@`` before the |
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360 handle in AP implementations, e.g.: ``@louise@example.org``). |
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361 |
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362 .. note:: |
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363 |
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364 Some AP implementations such as Mastodon don't retrieve existing items, but only keep |
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365 new ones once an actor is followed. That means that you won't see any message published |
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366 before your entity is followed. Other implementations may work differently. |
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367 |
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368 |
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369 .. _ap-xmpp-threads-conversion: |
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370 |
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371 ActivyPub to XMPP Discussion Threads Conversion |
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372 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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373 |
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374 By default, each (micro)blog publication converted from ActivityPub to XMPP Pubsub is |
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375 associated with a comment node (see `XEP-0277 comments`_) to allow user to post a reply on |
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376 any on them. This result in a "tree-like" comments threading model, which is similar to |
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377 what you can see on popular website such as Reddit, Hacker News, or LinuxFr. |
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378 |
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379 However, some XMPP clients may not play nicely with this kind of threading model. To work |
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380 around this, the ``comments_max_depth`` option allows to limit the maximum number of |
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381 thread. It is an integer value which indicate how many comments nodes may exist for a root |
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382 post. If set to ``1``, only one comment node will be made, and ActivityPub items below |
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383 this level will be moved to this single XMPP pubsub comment node. |
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384 |
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385 The default value of ``0`` means unlimited max depth. |
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386 |
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387 An example can probably make it more clear. Imagine that you have a message ``root |
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388 message``, with a comment to it named ``1``, a comment to ``1`` named ``2`` and so on |
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389 until ``5``. With ``comments_max_depth`` set to ``0``, you'll have one comment node per |
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390 item, resulting in following threads model:: |
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391 |
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392 root message ┑ |
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393 ┕ 1 ┑ |
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394 ┕ 2 ┑ |
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395 ┕ 3 ┑ |
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396 ┕ 4 ┑ |
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397 ┕ 5 |
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398 |
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399 With ``comments_max_depth`` set to ``2``, only 2 nodes will be created, and items below |
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400 depth ``2`` will be put on the same level:: |
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401 |
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402 root message ┑ |
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403 ┕ 1 ┑ |
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404 ┝ 2 |
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405 ┝ 3 |
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406 ┝ 4 |
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407 ┕ 5 |
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408 |
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409 This way, admins can configure the model which suits best the clients which is expected to |
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410 be mainly used on the instance. |
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411 |
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412 .. _XEP-0277 comments: https://xmpp.org/extensions/xep-0277.html#comments |
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413 |
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414 Publishing an Item |
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415 ~~~~~~~~~~~~~~~~~~ |
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416 |
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417 To publish a new item (e.g. a blog post), you just need to publish normally on your own |
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418 PEP/pubsub node, AP actors following you will be notified. To reply to an AP item, just |
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419 publish to the corresponding pubsub node managed by the gateway. This is transparent for |
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420 AP and XMPP end users. |
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421 |
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422 For instance, if Pierre has posted an interesting message on his AP server, and Louise |
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423 wants to reply to it, she just use a client to reply on the comments node of this message, |
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424 this will be delivered as an AP object to Pierre's AP server. |
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425 |
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426 On the other hand, if Louise is publishing a new blog post on her XMPP server, Pierre will |
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427 receive corresponding AP object because he's following her. If Pierre answer using his AP |
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428 client, the corresponding message will be published on the comments node of the message |
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429 that Louise has initially published. |
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430 |
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431 Following, Subscribing and Cache |
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432 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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433 |
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434 When you try to access an uncached AP collection from XMPP (e.g. blog posts), a best |
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435 effort is done to translate XMPP pagination (which uses `XEP-0059 (Result Set |
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436 Management)`_) to the less powerful `AP Collection Paging`_. This is inefficient due to |
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437 technical limitations (page size can't be specified in AP, there is not standard way to |
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438 request item after or before a specific ID, implementations may not implement reverse |
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439 pagination). |
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440 |
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441 That's one of the reason why whenever possible, collections are cached locally. Once |
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442 cached, it's easier to return items according to complex requests. |
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443 |
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444 However, to cache correctly an AP collection, you need to keep it in sync, and thus to |
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445 receive update when something change (e.g. a new blog item is published). |
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446 |
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447 In AP, this is done by following an actor, in XMPP this correspond to a node subscription. |
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448 |
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449 When you subscribe to a blog node managed by this gateway, this will be translated to a |
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450 *follow* activity on AP side, and vice versa. |
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451 |
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452 When an AP actor is followed, its *outbox* collection (i.e. message published), are |
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453 automatically cached, and will be updated when events will be received. That means that |
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454 you can use pubsub cache search on followed actors, e.g. to retrieve all items about a |
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455 specific topic or published at specific time range. |
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456 |
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457 Reciprocally, unsubscribing from a node will *unfollow* the corresponding AP actor. |
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458 |
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459 If an AP actor is following or unfollowing an actor mapping an XMPP entity, they nodes |
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460 will be subscribed to or unsubscribed from. |
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461 |
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462 All subscriptions are made public as specified by `XEP-0465 (Pubsub Public Subscriptions)`_. |
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463 |
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464 .. _XEP-0059 (Result Set Management): https://xmpp.org/extensions/xep-0059.html |
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465 .. _AP Collection Paging: https://www.w3.org/TR/activitystreams-core/#h-paging |
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466 .. _XEP-0465 (Pubsub Public Subscriptions): https://xmpp.org/extensions/inbox/pubsub-public-subscriptions.html |
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467 |
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468 Following/Followers Collections and Public Pubsub Subscription |
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469 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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470 |
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471 The AP *following* collection is mapped to `XEP-0465 (Pubsub Public Subscriptions)`_. |
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472 |
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473 In the same spirit, the AP *followers* collection correspond to public subscribers to the |
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474 microblog node. |
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475 |
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476 Because AP doesn't send any event when *following* or *followers* collections are |
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477 modified, those collections can't be cached, and thus the translation to public pubsub |
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478 subscriptions is done as best as possible given the constraints. |
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479 |
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480 .. _ap-message_delivery: |
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481 |
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482 Messages Delivery |
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483 ~~~~~~~~~~~~~~~~~ |
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484 |
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485 The gateway can convert AP publications to either XMPP pubsub items (using `XEP-0277 |
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486 (Microblogging over XMPP)`_ when suitable) or to XMPP messages (`<message>` stanzas, i.e. |
3790 | 487 the ones used for instant messaging). Of course it also converts in a similar way in the |
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488 other direction (XMPP → ActivityPub). |
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489 |
3790 | 490 A received AP item will be converted to an XMPP pubsub item if any of the following |
491 conditions is fulfilled: | |
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492 |
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493 - it is addressed to the special `*public* collection`_ |
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494 - it is addressed to a local *followers* collection |
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495 |
3790 | 496 A received AP item will be converted to an XMPP message if all the following conditions |
497 are fulfilled: | |
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498 |
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499 - it is **not** addressed to the special *public* collection |
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500 - it is **not** addressed to a any local *followers* collection. |
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501 |
3790 | 502 In other words, if an AP item is addressed directly to one or more local users, is not |
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503 public and is not addressed to a *followers* collection, it will be converted to an XMPP |
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504 message, otherwise it will be converted to an XMPP pubsub item. |
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505 |
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506 The behaviour is symmetric, thus if you send an XMPP message it will be converted to an AP |
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507 item which will be only addressed to your recipient. If you write using XMPP pubsub, the |
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508 suitable followers collections of the target AP actor will be automatically added, and the |
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509 item will have the special *public* collection added. |
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510 |
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511 .. note:: |
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512 |
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513 ActivyPub doesn't do any kind of `end-to-end encryption`_, it is **not** the same level of |
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514 privacy as XMPP. |
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515 |
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516 Messages will be at minimum readable by the administrators of the AP gateway and of the |
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517 ActivyPub server of the destinee. Be sure to understand that before sending messages. |
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518 |
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519 If you need more privacy, you need to use either XMPP only (without the ActivityPub |
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520 gateway) with clients implementing correctly end-to-end encryption, or an other |
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521 software. Depending of the level of pricacy required, you may want to use |
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522 authentication by a separated channel, a client which has been audited, encryption by |
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523 default, etc. This is beyond the scope of this AP gateway documentation. |
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524 |
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525 In short, don't use ActivityPub if you need a high level of privacy. This is a current |
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526 protocol limitation, and there is nothing that this gateway can do about this until |
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527 ActivityPub and its implementations evolve. |
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528 |
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529 .. _XEP-0277 (Microblogging over XMPP): https://xmpp.org/extensions/xep-0277.html |
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530 .. _*public* collection: https://www.w3.org/TR/activitypub/#public-addressing |
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531 .. _end-to-end encryption: https://en.wikipedia.org/wiki/End-to-end_encryption |
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532 |
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533 Message/Item Retraction |
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534 ~~~~~~~~~~~~~~~~~~~~~~~ |
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535 |
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536 If you retract a pubsub item (e.g. a blog post), that is followed by ActivityPub actors, |
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537 a suitable `Delete` activity will be emitted. In other words, the ActivityPub servers will |
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538 be notified of the retraction. |
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539 |
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540 Similarly if an AP actor is deleting an item, a suitable `XEP-0060 retraction event`_ will |
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541 be sent to subscribers. |
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542 |
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543 In the case of direct messages (see :ref:`ap-message_delivery`), `XEP-0424 (Message |
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544 Retraction)`_ is used in both reception (AP ``Delete`` activity is converted to XEP-0424 |
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545 and vice versa). |
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546 |
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547 All of this should be transparent to users as long as their clients support the mentioned |
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548 XEPs. |
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549 |
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550 .. note:: |
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551 |
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552 When retracting a message/item, a retraction request (or equivalent AP "Delete" |
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553 activity) is sent, so the other end clients **may** delete the item. |
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554 |
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555 However, there is no way to be sure that the item will be actually deleted: once |
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556 something is sent on the network, any recipient can see it, copy it, share it, etc. |
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557 There is no way to forbid that, and this is true for software, decentralized or not |
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558 (and not only ActivityPub or XMPP). |
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559 |
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560 Be sure to understand that before sending anything sensitive. |
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561 |
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562 .. note:: |
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563 |
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564 When deleting an item on ActivityPub, the item is often replaced by a "tombstone", and |
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565 it's not possible to send a new item with the same ID. Some software (it's at least the |
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566 case with Mastodon), will silently reject the item, and thus people won't see it. |
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567 |
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568 This is a different behaviour from XMPP where you can publish a pubsub item, retract |
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569 it, and publish a new item with the same ID. |
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570 |
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571 Thus if you retract an item, be sure to publish any new one with new and unique ID, |
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572 otherwise the item may not appear to ActivityPub users (and as the item may be rejected |
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573 silently, you may not be notified). |
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574 |
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575 However this should not be a problem in the vast majority of cases, as most XMPP client |
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576 implementing pubsub or pubsub service will generate automatically unique IDs for new |
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577 items. |
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578 |
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579 .. _XEP-0060 retraction event: https://xmpp.org/extensions/xep-0060.html#publisher-delete |
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580 .. _XEP-0424 (Message Retraction): https://xmpp.org/extensions/xep-0424.html |
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581 |
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582 Blocking an User |
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583 ~~~~~~~~~~~~~~~~ |
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584 |
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585 You can block AP actors using :ref:`its virtual JID <ap-actor-from-xmpp>` in the same way |
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586 as for any XMPP entity, by using `XEP-0191 (Blocking Command)`_. |
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587 |
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588 This is done at the XMPP server level and your server must support it. From client side, |
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589 many clients support it, and you can use Libervia CLI to do it from command-line (see |
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590 :ref:`libervia-cli_blocking`). |
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591 |
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592 .. _XEP-0191 (Blocking Command): https://xmpp.org/extensions/xep-0191.html |
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593 |
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594 Identity and Avatar |
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595 ~~~~~~~~~~~~~~~~~~~ |
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596 |
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597 The gateway does the conversion between XMPP identity and AP actor metadata. |
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598 |
3838 | 599 XMPP "identity" is actually a compilation of data coming from various locations and in |
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600 particular `XEP-0292 (vCard4 Over XMPP)`_. In those data, vCard's ``nickname`` (first |
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601 found) is used as AP ``name`` field, and vCard's ``note`` is used as AP's ``summary`` |
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602 (it's generally a self-description of users). |
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603 |
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604 For avatars, `XEP-0084 (User Avatar)`_ is used (and actor's ``icon`` field is used on AP |
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605 side). Avatars are downloaded the first time that they are requested, and kept in cache |
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606 for future requests. |
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607 |
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608 Even if XEP-0292 and XEP-0084 are the main XEPs used, Libervia checks various locations, |
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609 and other extensions like `XEP-0054 (vcard-temp)`_ may be used as fallback. |
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610 |
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611 .. _XEP-0292 (vCard4 Over XMPP): https://xmpp.org/extensions/xep-0292.html |
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612 .. _XEP-0084 (User Avatar): https://xmpp.org/extensions/xep-0084.html |
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613 .. _XEP-0054 (vcard-temp): https://xmpp.org/extensions/xep-0054.html |
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614 |
3838 | 615 Mentions |
616 ~~~~~~~~ | |
617 | |
618 Mentions are converted by the gateway under some conditions explained below. | |
619 | |
620 When receiving an AP item which converts to a pubsub item (i.e. not a direct message), for | |
621 any local user mentioned (using a tag of type ``Mention``) or directly specified in a | |
622 target field (``to``, ``bto``, ``cc`` or ``bcc``), a `XEP-0372 (References)`_ type mention | |
623 will be emitted. | |
624 | |
625 This is not done for direct message as the recipients are already specified, and sending | |
626 reference is most probably not desired for a private message. | |
627 | |
628 In the direction XMPP 🠞 ActivityPub, it's more complicated because XMPP sends references | |
629 separately from the pubsub item, while ActivityPub links them in the same item. | |
630 | |
631 If a XEP-0372 reference targeting an AP actor is received and anchor a pubsub item, the | |
632 item will be looked after in cache. If found, it will be converted to an AP item, a | |
633 mention will be added, and the item will be delivered to the mentioned entity. | |
634 | |
635 This only works if the mentioned actor is on a server which has not already received the | |
636 original item, because otherwise the AP implementation will most probably ignore the new | |
637 item which has the same ID. | |
638 | |
639 It is hard to avoid sending first published item, then the same item with the reference, | |
640 because XEP-0372 references are received after the published items. | |
641 | |
642 To work around that, when an XMPP blog item is received, its body is scanned to find | |
643 ``@user@server.tld`` type mention, and if found a mention is automatically added to the | |
644 resulting AP item. | |
645 | |
646 It is not ideal to parse the body, but that's an acceptable trade-off to make mention | |
647 working. This behaviour is activated by default, but can be deactivated by setting | |
648 ``auto_mentions`` option to ``false``. Auto mentions are only used for pubsub items, and | |
649 not for direct messages for the same reason as mention are not checked in AP direct | |
650 messages (see above). | |
651 | |
652 .. note:: | |
653 | |
654 For auto mentions, it's the AP actor handle which must be used, not the corresponding | |
655 virtual JID. | |
656 | |
657 If you want to mention ``louise@example.org`` then you must use directly | |
658 ``@louise@example.org``, and NOT something like | |
659 ``@louise\40example.org@ap.example.net``. | |
660 | |
661 To mention XMPP entities, your client must use XEP-0372 references directly. | |
662 | |
663 .. _XEP-0372 (References): https://xmpp.org/extensions/xep-0372.html | |
664 | |
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665 Using the Component (for developers) |
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666 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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667 |
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668 Publication of AP items can be tested using the following method (with can be accessed |
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669 through the ``APSend`` bridge method, client is then replaced by the ``profile`` name, as |
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670 last argument): |
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671 |
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672 .. automethod:: sat.plugins.plugin_comp_ap_gateway.APGateway.publishMessage |
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673 |
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674 The method can be used either with CLI's :ref:`debug bridge method |
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675 <li_debug_bridge_method>` or with any D-Bus tool like ``qdbus`` or ``d-feet`` (only if you |
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676 use the D-Bus bridge). |
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677 |
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678 example |
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679 ~~~~~~~ |
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680 |
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681 On its ``example.net`` Mastodon instance, Pierre has published a message with the id |
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682 ``https://example.net/@pierre/106986412193109832``. To send a reply to this message, |
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683 Louise can use the following command:: |
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684 |
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685 $ li debug bridge method -c APSend '"{\"node\": \"https://example.net/@pierre/106986412193109832\", \"content\": \"A lille hello from XMPP\"}","pierre\\40example.net@ap.example.org", "louise"' |
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686 |
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687 Note the double escaping, one for the shell argument, and the other to specify JSON |
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688 object. |