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+---
+authors: CJ <cjslep@gmail.com>
+status: DRAFT
+dateReceived: 2020-12-11
+---
+# FEP-f1d5: NodeInfo in Fediverse Software
+
+## 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 views and with some logical restructuring of the metadata
+[ServiceInfo]. Building off of NodeInfo and NodeInfo2, ServiceInfo was briefly
+explored [ServiceInfoRepository].
+
+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:
+
+* 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 `inbound` and `outbound` 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 `users.usage` is not denormalized, such that implementations can provide
+  custom pairs of (activity counts, time period in days) that make sense for the
+  software.
+* The `activeHalfyear` and `activeMonth` are ill-named properties for describing
+  the time periods of 180 days and 30 days, respectively. A "half of one year"
+  is roughly 182.5 days, 75% of the time. A month is 30 days, 33% of the time.
+* The `localPosts` and `localComments` 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` and `localComments` are required, which is problematic for
+  software that does not have comments, or does not have posts.
+
+## Implementations
+
+### Servers
+
+* Mastodon
+* Matrix
+* Pleroma
+* PeerTube
+* WriteFreely
+* Friendica
+* Diaspora
+* PixelFed
+* Misskey
+* Funkwhale
+* Plume
+* GNU Social
+* lemmy
+* zap
+* Socialhome
+* epicyon
+* apcore
+
+... just to name a few.
+
+### Clients
+
+* [The-Federation.Info](https://the-federation.info/)
+* [Pod Uptime](https://podupti.me/)
+* [Hello Matrix Public Servers](https://www.hello-matrix.net/public_servers.php)
+
+## References
+
+- [ActivityPub] Christopher Lemmer Webber, Jessica Tallon, [ActivityPub](https://www.w3.org/TR/activitypub/), 2018
+- [NodeInfoRepository] Jonne Haß, [jhass/nodeinfo](https://github.com/jhass/nodeinfo), 2014
+- [NodeInfo2Repository] Jason Robinson, [jaywink/nodeinfo2](https://github.com/jaywink/nodeinfo2), 2016
+- [ServiceInfo] Jason Robinson, [ServiceInfo - specification for service metadata](https://talk.feneas.org/t/serviceinfo-specification-for-service-metadata/99), 2019
+- [ServiceInfoRepository] Jason Robinson, [feneas/serviceinfo](https://git.feneas.org/feneas/serviceinfo), 2019
+- [RFC-2119] S. Bradner, [Key words for use in RFCs to Indicate Requirement Levels](https://tools.ietf.org/html/rfc2119.html
+
+## 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.