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https://github.com/ilyakooo0/urbit.git
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f765b34459
Was using "manual" scries, and incorrect ones at that. Would crash, causing subscriptions to not go through. Now uses the helper function and correct paths.
323 lines
8.2 KiB
Plaintext
323 lines
8.2 KiB
Plaintext
:: link-proxy-hook: make local pages available to foreign ships
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::
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:: this is a "proxy" style hook, relaying foreign subscriptions into local
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:: stores if permission conditions are met.
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:: the patterns herein should one day be generalized into a proxy-hook lib.
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::
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:: this uses metadata-store to discover resources and their associated
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:: groups. it sets the permission condition to be that a ship must be in a
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:: group associated with the resource it's subscribing to.
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:: we check this on-watch, but also subscribe to metadata & groups so that
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:: we can kick subscriptions if needed (eg ship removed from group).
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::
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:: we deduplicate incoming subscriptions on the same path, ensuring we have
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:: exactly one local subscription per unique incoming subscription path.
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:: this comes at the cost of assuming that the store's initial response is
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:: whatever's returned by the scry at that path, but perhaps that should
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:: become part of the stores standard anyway.
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::
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:: when adding support for new paths, the only things you'll likely want
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:: to touch are +permitted, +initial-response, & +kick-proxies.
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::
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/- group-store, *metadata-store
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/+ *link, metadata, default-agent, verb, dbug
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|%
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+$ state-0
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$: %0
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::TODO we use this to detect "first sub started" and "last sub left",
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:: but can't we use [wex sup]:bowl for that?
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active=(map path (set ship))
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==
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::
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+$ card card:agent:gall
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--
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::
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=| state-0
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=* state -
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::
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%- agent:dbug
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%+ verb |
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^- agent:gall
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=<
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|_ =bowl:gall
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+* this .
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do ~(. +> bowl)
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def ~(. (default-agent this %&) bowl)
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::
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++ on-init
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^- (quip card _this)
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:_ this
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~[watch-groups:do watch-metadata:do]
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::
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++ on-save !>(state)
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++ on-load
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|= old=vase
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^- (quip card _this)
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[~ this(state !<(state-0 old))]
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::
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++ on-watch
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|= =path
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^- (quip card _this)
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:: the local ship should just use link-store directly
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::TODO do we want to allow this anyway, to avoid client-side target checks?
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::
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?< (team:title [our src]:bowl)
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?> (permitted:do src.bowl path)
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=^ cards state
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(start-proxy:do src.bowl path)
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[cards this]
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::
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++ on-leave
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|= =path
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^- (quip card _this)
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=^ cards state
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(stop-proxy:do src.bowl path)
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[cards this]
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::
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++ on-agent
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|= [=wire =sign:agent:gall]
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^- (quip card _this)
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?: ?=([%groups ~] wire)
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=^ cards state
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(take-groups-sign:do sign)
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[cards this]
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?: ?=([%proxy ^] wire)
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=^ cards state
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(handle-proxy-sign t.wire sign)
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[cards this]
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~| [dap.bowl %weird-wire wire]
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!!
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::
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++ on-poke on-poke:def
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++ on-peek on-peek:def
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++ on-arvo on-arvo:def
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++ on-fail on-fail:def
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--
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::
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|_ =bowl:gall
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+* md ~(. metadata bowl)
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::
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:: permissions
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::
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++ permitted
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|= [who=ship =path]
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^- ?
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:: we only expose /local-pages and /annotations,
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:: to ships in the groups associated with the resource.
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:: (no url-specific annotations subscriptions, either.)
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::
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=/ target=(unit ^path)
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?: ?=([%local-pages ^] path)
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`t.path
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?: ?=([%annotations ~ ^] path)
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`t.t.path
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~
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?~ target |
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~? !.^(? %gu (scot %p our.bowl) %metadata-store (scot %da now.bowl) ~)
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%woah-md-s-not-booted ::TODO fallback if needed
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%+ lien (groups-from-resource:md %link u.target)
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|= =group-path
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^- ?
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=- (~(has in (fall - *group:group-store)) who)
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%^ scry-for (unit group:group-store)
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%group-store
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group-path
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::
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++ kick-revoked-permissions
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|= [=path who=(list ship)]
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^- (list card)
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%+ murn who
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|= =ship
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^- (unit card)
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:: no need to remove to ourselves
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::
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?: =(our.bowl ship) ~
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?: (permitted ship path) ~
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`(kick-proxies ship path)
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::
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:: metadata subscription
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::
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++ watch-metadata
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^- card
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[%pass /metadata %agent [our.bowl %metadata-store] %watch /app-name/link]
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::
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++ take-metadata-sign
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|= =sign:agent:gall
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^- (quip card _state)
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?- -.sign
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%poke-ack ~|([dap.bowl %unexpected-poke-ack /metadata] !!)
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%kick [[watch-metadata]~ state]
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::
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%watch-ack
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?~ p.sign [~ state]
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=/ =tank
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:- %leaf
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"{(trip dap.bowl)} failed subscribe to metadata store. very wrong!"
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%- (slog tank u.p.sign)
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[~ state]
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::
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%fact
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=* mark p.cage.sign
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=* vase q.cage.sign
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?. ?=(%metadata-update mark)
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~| [dap.bowl %unexpected-mark mark]
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!!
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%- handle-metadata-update
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!<(metadata-update vase)
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==
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::
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++ handle-metadata-update
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|= upd=metadata-update
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^- (quip card _state)
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:_ state
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?. ?=(%remove -.upd) ~
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?> =(%link app-name.resource.upd)
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:: if a group is no longer associated with a resource,
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:: we need to re-check permissions for everyone in that group.
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::
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%+ kick-revoked-permissions
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app-path.resource.upd
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%~ tap in
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=- (fall - *group:group-store)
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%^ scry-for (unit group:group-store)
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%group-store
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group-path.upd
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::
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:: groups subscription
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::TODO largely copied from link-listen-hook. maybe make a store-listener lib?
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::
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++ watch-groups
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^- card
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[%pass /groups %agent [our.bowl %group-store] %watch /all]
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::
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++ take-groups-sign
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|= =sign:agent:gall
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^- (quip card _state)
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?- -.sign
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%poke-ack ~|([dap.bowl %unexpected-poke-ack /groups] !!)
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%kick [[watch-groups]~ state]
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::
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%watch-ack
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?~ p.sign [~ state]
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=/ =tank
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:- %leaf
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"{(trip dap.bowl)} failed subscribe to group store. very wrong!"
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%- (slog tank u.p.sign)
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[~ state]
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::
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%fact
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=* mark p.cage.sign
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=* vase q.cage.sign
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?+ mark ~|([dap.bowl %unexpected-mark mark] !!)
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%group-initial [~ state]
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%group-update (handle-group-update !<(group-update:group-store vase))
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==
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==
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::
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++ handle-group-update
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|= upd=group-update:group-store
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^- (quip card _state)
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:_ state
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?. ?=(%remove -.upd) ~
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:: if someone was removed from a group, find all link resources associated
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:: with that group, then kick their subscriptions if they're no longer
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::
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%- zing
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%+ turn (app-paths-from-group:md %link pax.upd)
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|= =app-path
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^- (list card)
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%+ kick-revoked-permissions
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app-path
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~(tap in members.upd)
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::
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:: proxy subscriptions
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::
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++ kick-proxies
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|= [who=ship =path]
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^- card
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=- [%give %kick - `who]
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:~ [%local-pages path]
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[%annotations %$ path]
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==
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::
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++ handle-proxy-sign
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|= [=wire =sign:agent:gall]
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^- (quip card _state)
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?- -.sign
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%poke-ack ~|([dap.bowl %unexpected-poke-ack wire] !!)
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%fact [[%give %fact ~[wire] cage.sign]~ state]
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%kick [[(proxy-pass-link-store wire %watch wire)]~ state]
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::
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%watch-ack
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?~ p.sign [~ state]
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=/ =tank
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:- %leaf
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"{(trip dap.bowl)} failed subscribe to link-store. very wrong!"
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%- (slog tank u.p.sign)
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[~ state]
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==
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::
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++ proxy-pass-link-store
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|= [=path =task:agent:gall]
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^- card
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:* %pass
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[%proxy path]
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%agent
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[our.bowl %link-store]
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task
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==
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::
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++ initial-response
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|= =path
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^- card
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=; =initial
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[%give %fact ~ %link-initial !>(initial)]
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?+ path !!
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[%local-pages ^]
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[%local-pages (scry-for (map ^path pages) %link-store path)]
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::
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[%annotations %$ ^]
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[%annotations (scry-for (per-path-url notes) %link-store path)]
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==
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::
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++ start-proxy
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|= [who=ship =path]
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^- (quip card _state)
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:_ state(active (~(put ju active) path who))
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:_ ~
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:: if we already have a local subscription open,
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::
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?. =(~ (~(get ju active) path))
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:: gather the initial response ourselves, and send that.
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::
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(initial-response path)
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:: else, open a local subscription,
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:: sending outward its initial response when we hear it.
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::
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(proxy-pass-link-store path %watch path)
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::
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++ stop-proxy
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|= [who=ship =path]
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^- (quip card _state)
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=. active (~(del ju active) path who)
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:_ state
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:: if there are still subscriptions remaining, do nothing.
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::
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?. =(~ (~(get ju active) path)) ~
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:: else, close the local subscription.
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::
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[(proxy-pass-link-store path %leave ~)]~
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::
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:: helpers
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::
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++ scry-for
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|* [=mold =app-name =path]
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.^ mold
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%gx
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(scot %p our.bowl)
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app-name
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(scot %da now.bowl)
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(snoc `^path`path %noun)
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==
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--
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