| 1 | package calls |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | func normalizeAddress(address string) string { |
| 10 | return strings.ToLower(strings.TrimSpace(address)) |
| 11 | } |
| 12 | |
| 13 | // allowlist is the team in lone shape (spec §7.1): the addresses that |
| 14 | // are members. A nil map admits everyone, which is allowed only in |
| 15 | // development. |
| 16 | type allowlist struct { |
| 17 | addrs map[string]struct{} |
| 18 | } |
| 19 | |
| 20 | func (a allowlist) allows(address string) bool { |
| 21 | if a.addrs == nil { |
| 22 | return true |
| 23 | } |
| 24 | _, ok := a.addrs[normalizeAddress(address)] |
| 25 | return ok |
| 26 | } |
| 27 | |
| 28 | func resolveAllowlist(cfg Config) (allowlist, error) { |
| 29 | addrs := make(map[string]struct{}) |
| 30 | for _, addr := range cfg.AllowedAddresses { |
| 31 | addr = normalizeAddress(addr) |
| 32 | if addr == "" { |
| 33 | continue |
| 34 | } |
| 35 | addrs[addr] = struct{}{} |
| 36 | } |
| 37 | if len(addrs) > 0 { |
| 38 | return allowlist{addrs: addrs}, nil |
| 39 | } |
| 40 | if cfg.development() { |
| 41 | return allowlist{}, nil |
| 42 | } |
| 43 | return allowlist{}, fmt.Errorf("calls: $CALLS_ALLOWED_ADDRESSES is empty and Env is %q, not %q; refusing to start with no team", cfg.Env, EnvDevelopment) |
| 44 | } |
| 45 | |
| 46 | // Standing is a person's entry authority toward a meeting (spec §2.3). |
| 47 | // Computed, never stored. |
| 48 | type Standing int |
| 49 | |
| 50 | const ( |
| 51 | StandingNone Standing = iota |
| 52 | StandingGuest |
| 53 | StandingMember |
| 54 | ) |
| 55 | |
| 56 | func (s Standing) String() string { |
| 57 | switch s { |
| 58 | case StandingMember: |
| 59 | return "member" |
| 60 | case StandingGuest: |
| 61 | return "guest" |
| 62 | } |
| 63 | return "none" |
| 64 | } |
| 65 | |
| 66 | // allowNow is the team as it stands right now. It is read through an |
| 67 | // atomic rather than straight off a.cfg because TestHandle.SetAllowlist |
| 68 | // swaps it while it is being read — by request handlers on their own |
| 69 | // goroutines, which is what the race detector actually catches here, and |
| 70 | // by the hub's tick when a test drives one. A member dropped from the |
| 71 | // team mid-call is what spec §2.4's tick has to notice, and there is no |
| 72 | // other way to make that happen in a test without rewriting an |
| 73 | // environment variable and restarting the process. |
| 74 | // Production never calls the setter, so this is one atomic load on a |
| 75 | // path that already does a database read. |
| 76 | func (a *app) allowNow() allowlist { |
| 77 | if l := a.allow.Load(); l != nil { |
| 78 | return *l |
| 79 | } |
| 80 | return a.cfg.allow |
| 81 | } |
| 82 | |
| 83 | // isMember is the lone-shape roster read: the allowlist. |
| 84 | func (a *app) isMember(p Person) bool { |
| 85 | l := a.allowNow() |
| 86 | return !p.Anonymous && l.addrs != nil && l.allows(p.Email) |
| 87 | } |
| 88 | |
| 89 | func (a *app) standingFor(ctx context.Context, p Person, m Meeting) (Standing, error) { |
| 90 | if p.Anonymous && m.RequireSignin { |
| 91 | return StandingNone, nil |
| 92 | } |
| 93 | if a.isMember(p) { |
| 94 | return StandingMember, nil |
| 95 | } |
| 96 | g, ok, err := a.store.grantFor(ctx, m.ID, p.ID) |
| 97 | if err != nil { |
| 98 | return StandingNone, err |
| 99 | } |
| 100 | if ok && g.ExpiresAt.After(a.store.now()) { |
| 101 | return StandingGuest, nil |
| 102 | } |
| 103 | return StandingNone, nil |
| 104 | } |
| 105 | |
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