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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180// Package access defines the node's role-based access control vocabulary:// the roles a node can grant, the modes that decide each role, and the// addressing of the grants themselves.//// Grants are modeled as records in an atproto space (the "permissioned// data" spec, bluesky-social/proposals 0016). The node's access-control// space has the broadcaster DID as its authority, space type// place.stream.access.control and skey "self"; a grant is a// place.stream.access.grant record authored by the admin who created it,// and the policy is a single place.stream.access.policy record authored by// the authority. Until the spaces implementation ships, the node keeps// those records in statedb addressed by their at:// space URIs, so moving// them into a real space later is a data migration and not a redesign.//// This package is a leaf: pkg/config depends on it, so it must not import// anything above pkg/placestream.package access
import ( "context" "fmt" "net/http" "strings"
"stream.place/streamplace/pkg/placestream")
// Roles a node can grant. Admin implies every other role.const ( RoleAdmin = "admin" RoleViewer = "viewer" RoleStreamer = "streamer" RoleSyndicate = "syndicate" RoleVOD = "vod")
// Roles lists every role in display order.var Roles = []string{RoleAdmin, RoleViewer, RoleStreamer, RoleSyndicate, RoleVOD}
// Modes decide how a role is held.const ( // ModeOpen: every account (including anonymous visitors) holds the role. ModeOpen = "open" // ModeAllowlist: only accounts with a grant hold the role. ModeAllowlist = "allowlist" // ModeOff: nobody holds the role. Admins are always exempt. ModeOff = "off")
// Grant sources, as reported in place.stream.access.defs#grantView.const ( SourceSpace = "space" SourceEnvironment = "environment")
// Space addressing.const ( SpaceType = "place.stream.access.control" SpaceKey = "self" GrantCollection = "place.stream.access.grant" PolicyCollection = "place.stream.access.policy" PolicyRKey = "self")
// ValidRole reports whether r is a role this node knows about.func ValidRole(r string) bool { for _, known := range Roles { if known == r { return true } } return false}
// ValidMode reports whether m is a mode this node knows about.func ValidMode(m string) bool { return m == ModeOpen || m == ModeAllowlist || m == ModeOff}
// ParsePolicy parses "role=mode,role=mode" (the --access-policy flag).// The admin role cannot be set; it is always allowlist.func ParsePolicy(s string) (map[string]string, error) { out := map[string]string{} for _, pair := range strings.Split(s, ",") { pair = strings.TrimSpace(pair) if pair == "" { continue } role, mode, ok := strings.Cut(pair, "=") role, mode = strings.TrimSpace(role), strings.TrimSpace(mode) if !ok || !ValidRole(role) || !ValidMode(mode) { return nil, fmt.Errorf("expected role=mode with role in %v and mode in [%s %s %s], got %q", Roles, ModeOpen, ModeAllowlist, ModeOff, pair) } if role == RoleAdmin { return nil, fmt.Errorf("the admin role is always %s", ModeAllowlist) } out[role] = mode } return out, nil}
// SpaceURI is the node's access-control space:// at://{authority}/space/place.stream.access.control/selffunc SpaceURI(authority string) string { return fmt.Sprintf("at://%s/space/%s/%s", authority, SpaceType, SpaceKey)}
// GrantURI addresses one grant record inside the space:// at://{authority}/space/place.stream.access.control/self/{author}/place.stream.access.grant/{rkey}func GrantURI(authority, author, rkey string) string { return fmt.Sprintf("%s/%s/%s/%s", SpaceURI(authority), author, GrantCollection, rkey)}
// PolicyURI addresses the node's single policy record, authored by the// authority itself.func PolicyURI(authority string) string { return fmt.Sprintf("%s/%s/%s/%s", SpaceURI(authority), authority, PolicyCollection, PolicyRKey)}
// GrantRef is a parsed grant URI.type GrantRef struct { Authority string Author string RKey string}
// ParseGrantURI validates that uri has the grant shape for this space type// and returns its parts.func ParseGrantURI(uri string) (GrantRef, error) { rest, ok := strings.CutPrefix(uri, "at://") if !ok { return GrantRef{}, fmt.Errorf("not an at:// URI: %q", uri) } parts := strings.Split(rest, "/") // authority, "space", type, skey, author, collection, rkey if len(parts) != 7 || parts[1] != "space" || parts[2] != SpaceType || parts[3] != SpaceKey || parts[5] != GrantCollection { return GrantRef{}, fmt.Errorf("not a %s grant URI: %q", SpaceType, uri) } for _, seg := range []string{parts[0], parts[4], parts[6]} { if seg == "" { return GrantRef{}, fmt.Errorf("empty segment in grant URI: %q", uri) } } return GrantRef{Authority: parts[0], Author: parts[4], RKey: parts[6]}, nil}
// Checker answers the one question every gate in the node asks.type Checker interface { // Allowed reports whether did holds role. did may be empty for an // anonymous caller; only open-mode roles are held anonymously. Allowed(ctx context.Context, did, role string) bool // Modes returns the effective mode of every role, after environment // overrides such as SP_WIDE_OPEN and SP_DISABLE_SYNDICATION. Modes() map[string]string}
// Manager is a Checker that can also be administered.type Manager interface { Checker // ListGrants returns every grant, or only those of role when non-empty. // Environment-seeded grants are included with SourceEnvironment. ListGrants(ctx context.Context, role string) ([]placestream.AccessDefs_GrantView, error) // CreateGrant grants role to subject (a DID) on behalf of author. It is // idempotent: an existing grant is returned unchanged. CreateGrant(ctx context.Context, author, subject, role string, note *string) (*placestream.AccessDefs_GrantView, error) // DeleteGrant revokes the grant at uri. Returns ErrNotFound when there // is no such grant. DeleteGrant(ctx context.Context, uri string) error // UpdatePolicy sets the mode of the given roles, keeping the rest. UpdatePolicy(ctx context.Context, roles []placestream.AccessDefs_RoleMode) error // ViewerCookie mints the cookie that lets non-XRPC routes (playback, // chat websockets, thumbnails) recognise an allowed viewer. ViewerCookie(did string) *http.Cookie // ViewerFromCookie returns the DID a request's viewer cookie vouches for. ViewerFromCookie(r *http.Request) (string, bool)}
// ErrNotFound is returned by DeleteGrant when the URI matches nothing.var ErrNotFound = fmt.Errorf("grant not found")