FEP-f1d5: NodeInfo in Fediverse Software
by CJ cjslep@gmail.com, silverpill silverpill@firemail.cc submited on 2020-12-13 finalized on 2023-06-02
Summary
NodeInfo is a protocol intended to standardize upon a way to provide server-level metadata to the public. This enables tools and clients to utilize this metadata to assess server health or facilitate end-users choices about servers and software to use on the Fediverse.
History
NodeInfo was developed prior to the ActivityPub protocol targeted for use by diaspora, friendica, and redmatrix software [ActivityPub]. Some of the original protocols it encapsulated include diaspora, pumpio, and gnusocial.
The NodeInfo specification is incredibly strict in its schema, often requiring regex-validation and a closed set of enumerated possible values. As an objection to this, the NodeInfo2 fork was created as a form of criticism by removing some validation of fields and with some logical restructuring of the metadata. Building off of NodeInfo and NodeInfo2, ServiceInfo was briefly explored [ServiceInfo].
This FEP does not attempt to document the specific protocol details. For that, see the [NodeInfoRepository] and [NodeInfo2Repository]. It attempts to clarify the history and identify shortcomings with the current approaches, to bring context to developers of Fediverse Software.
Requirements
The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this specification are to be interpreted as described in [RFC-2119].
Fediverse software SHOULD implement NodeInfo [NodeInfoRepository].
Caveats
At the time of this FEP’s writing, the current objections to the current state of NodeInfo that have been identified by the community are below. Note that any technical alternatives identified are meant to be illustrative and not prescriptive:
- The
software.name
regex is unnecessarily strict. For example, no uppercase letters, no spaces, no non-English-alphabet, and no special characters besides hyphen are permitted. - The
software.version
field is required, which is unnecessarily strict. Forcibly requiring software to divulge version information is potentially a security issue. - The
inbound
andoutbound
elements are specified as a closed set of enums instead of a simple string. Protocol versioning manifests as renaming, having to add a new enum, which results in unclear version management. - The Fediverse software MUST have an
openRegistrations
concept due to it being required. - Lacks an extendable method for identifying and versioning other features, such
as HTTP Signatures, webfinger, or OAuth. Whereas the specification is very
strict, the
metadata
is too lax. - The
usage.users
is not denormalized, such that implementations can provide custom pairs of(activity counts, time period in days)
that make sense for the software. - The
usage.users
assumes that user identity is tied to a specific instance of running software. It is unclear how to counttotal
users when user identity is: spread across multiple servers, spread across multiple groups, or present within multiple collections of users. Multiple software instances could each have a reasonable claim to counting the user as “using” their software, which globally results users being counted more than once. - The
usage.users
activity counts likewise assume that user identity is tied to a specific instance of running software. For the same reasons above, where thetotal
user counts may result in duplicate counts of the same user across all software running, the activity countsactiveHalfYear
andactiveMonth
may also result in a globally inflated count. - The
activeHalfyear
andactiveMonth
are ill-named properties for describing the time periods of 180 days and 30 days, respectively. A “half of one year” is 180 days 0% of the time and roughly 182.5 days only 75% of the time. A month is 30 days only 33% of the time. - The
localPosts
andlocalComments
are not denormalized into pairs of(kind, counts)
for software that, for example, hosts audio files, hosts videos, or software that does not have comments, or does not have posts. - The
localPosts
andlocalComments
are required, which is problematic for software that does not have comments, or does not have posts.
Implementations
Servers
This list is not comprehensive:
- Mastodon
- Matrix
- Pleroma
- PeerTube
- WriteFreely
- Friendica
- Diaspora
- PixelFed
- Misskey
- Funkwhale
- Smithereen
- Plume
- GNU Social
- lemmy
- zap
- Socialhome
- epicyon
- apcore
Clients
References
- [ActivityPub] Christine Lemmer Webber, Jessica Tallon, ActivityPub, 2018
- [NodeInfoRepository] Jonne Haß, jhass/nodeinfo, 2014
- [NodeInfo2Repository] Jason Robinson, jaywink/nodeinfo2, 2016
- [ServiceInfo] Jason Robinson, ServiceInfo - specification for service metadata, 2019
- [RFC-2119] S. Bradner, Key words for use in RFCs to Indicate Requirement Levels, 1997
Copyright
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
To the extent possible under law, the authors of this Fediverse Enhancement Proposal have waived all copyright and related or neighboring rights to this work.