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Add proposed extensions to NIP-11
Take the proposed changes from https://github.com/nostr-protocol/nips/pull/163 and put them in NIP-11 under "Extra Fields"
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11.md
197
11.md
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@ -56,3 +56,200 @@ The relay server implementation MAY be provided in the `software` attribute. If
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### Version ###
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The relay MAY choose to publish its software version as a string attribute. The string format is defined by the relay implementation. It is recommended this be a version number or commit identifier.
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Extra Fields
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-----------------
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### Server Limitations ###
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These are limitations imposed by the relay on clients. Your client
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should expect that requests which exceed these *practical* limitations
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are rejected or fail immediately.
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```json
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{
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...
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limitation: {
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max_message_length: 16384,
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max_subscriptions: 20,
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max_filters: 100,
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max_limit: 5000,
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max_subid_length: 100,
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min_prefix: 4,
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max_event_tags: 100,
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max_content_length: 8196,
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min_pow_difficulty: 30,
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auth_required: true,
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payment_required: true,
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}
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...
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}
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```
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- `max_message_length`: this is the maximum number of bytes for incoming JSON that the relay
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will attempt to decode and act upon. When you send large subscriptions, you will be
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limited by this value. It also effectively limits the maximum size of any event. Value is
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calculated from `[` to `]` and is after UTF-8 serialization (so some unicode characters
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will cost 2-3 bytes). It is equal to the maximum size of the WebSocket message frame.
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- `max_subscriptions`: total number of subscriptions that may be
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active on a single websocket connection to this relay. It's possible
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that authenticated clients with a (paid) relationship to the relay
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may have higher limits.
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- `max_filters`: maximum number of filter values in each subscription.
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Must be one or higher.
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- `max_subid_length`: maximum length of subscription id as a string.
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- `min_prefix`: for `authors` and `ids` filters which are to match against
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a hex prefix, you must provide at least this many hex digits in the prefix.
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- `max_limit`: the relay server will clamp each filter's `limit` value to this number.
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This means the client won't be able to get more than this number
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of events from a single subscription filter. This clamping is typically done silently
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by the relay, but with this number, you can know that there are additional results
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if you narrowed your filter's time range or other parameters.
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- `max_event_tags`: in any event, this is the maximum number of elements in the `tags` list.
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- `max_content_length`: maximum number of characters in the `content`
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field of any event. This is a count of unicode characters. After
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serializing into JSON it may be larger (in bytes), and is still
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subject to the `max_message_length`, if defined.
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- `min_pow_difficulty`: new events will require at least this difficulty of PoW,
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based on [NIP-13](13.md), or they will be rejected by this server.
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- `auth_required`: this relay requires [NIP-42](42.md) authentication
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to happen before a new connection may perform any other action.
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Even if set to False, authentication may be required for specific actions.
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- `payment_required`: this relay requires payment before a new connection may perform any action.
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### Event Retention ###
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There may be a cost associated with storing data forever, so relays
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may wish to state retention times. The values stated here are defaults
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for unauthenticated users and visitors. Paid users would likely have
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other policies.
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Retention times are given in seconds, with `null` indicating infinity.
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If zero is provided, this means the event will not be stored at
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all, and preferably an error will be provided when those are received.
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```json
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{
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...
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retention: [
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{ kinds: [0, 1, [5, 7], [40, 49]], time: 3600 },
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{ kinds: [[40000, 49999], time: 100 },
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{ kinds: [[30000, 39999], count: 1000 },
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{ time: 3600, count: 10000 }
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]
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...
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}
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```
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`retention` is a list of specifications: each will apply to either all kinds, or
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a subset of kinds. Ranges may be specified for the kind field as a tuple of inclusive
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start and end values. Events of indicated kind (or all) are then limited to a `count`
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and or time period.
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It is possible to effectively blacklist Nostr-based protocols that rely on
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a specific `kind` number, by giving a retention time of zero for those `kind` values.
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While that is unfortunate, it does allow clients to discover servers that will
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support their protocol quickly via a single HTTP fetch.
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There is no need to specify retention times for _ephemeral events_ as defined
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in [NIP-16](16.md) since they are not retained.
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### Content Limitations ###
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Some relays may be governed by the arbitrary laws of a nation state. This
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may limit what content can be stored in cleartext on those relays. All
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clients are encouraged to use encryption to work around this limitation.
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It is not possible to describe the limitations of each country's laws
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and policies which themselves are typically vague and constantly shifting.
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Therefore, this field allows the relay operator to indicate which
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country's' laws might end up being enforced on them, and then
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indirectly on their users's content.
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Users should be able to avoid relays in countries they don't like,
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and/or select relays in more favourable zones. Exposing this
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flexibility is up to the client software.
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```json
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{
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...
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relay_countries: [ 'CA', 'US' ],
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...
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}
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```
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- `relay_countries`: a list of two-level ISO country codes (ISO 3166-1 alpha-2) whose
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laws and policies may affect this relay. `EU` may be used for European Union countries.
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Remember that a relay may be hosted in a country which is not the
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country of the legal entities who own the relay, so it's very
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likely a number of countries are involved.
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### Community Preferences ###
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For public text notes at least, a relay may try to foster a
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local community. This would encourage users to follow the global
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feed on that relay, in addition to their usual individual follows.
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To support this goal, relays MAY specify some of the following values.
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```json
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{
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...
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language_tags: [ 'en', 'en-419' ],
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tags: [ 'sfw-only', 'bitcoin-only', 'anime' ],
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posting_policy: 'https://example.com/posting-policy.html',
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...
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}
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```
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- `language_tags` is an ordered list
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of [IETF language tags](https://en.wikipedia.org/wiki/IETF_language_tag) indicating
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the major languages spoken on the relay.
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- `tags` is a list of limitations on the topics to be discussed.
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For example `sfw-only` indicates hat only "Safe For Work" content
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is encouraged on this relay. This relies on assumptions of what the
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"work" "community" feels "safe" talking about. In time, a common
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set of tags may emerge that allow users to find relays that suit
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their needs, and client software will be able to parse these tags easily.
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The `bitcoin-only` tag indicates that any *altcoin*, *"crypto"* or *blockchain*
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comments will be ridiculed without mercy.
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- `posting_policy` is a link to a human-readable page which specifies the
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community policies for the relay. In cases where `sfw-only` is True, it's
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important to link to a page which gets into the specifics of your posting policy.
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The `description` field should be used to describe your community
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goals and values, in brief. The `posting_policy` is for additional
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detail and legal terms. Use the `tags` field to signify limitations
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on content, or topics to be discussed, which could be machine
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processed by appropriate client software.
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### Pay-To-Relay ###
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Relays that require payments may want to expose their fee schedules.
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```json
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{
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...
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payments_url: "https://my-relay/payments",
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fees: {
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"admission": [{ amount: 1000000, unit: 'msats' }],
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"subscription": [{ amount: 5000000, unit: 'msats', period: 2592000 }],
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"publication": [{ kinds: [4], amount: 100, unit: 'msats' }],
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},
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...
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}
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