| 1 | package callscore |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "io" |
| 9 | "net/http" |
| 10 | "time" |
| 11 | ) |
| 12 | |
| 13 | // StartMeeting creates a meeting on the instance this client is signed |
| 14 | // in to and answers its identifier. It is the app's half of the meeting |
| 15 | // list's one-click button, and it exists because that button's web |
| 16 | // answer is the link-once *page* — a screen, and not something a Swift |
| 17 | // app can read without pretending to be a browser. |
| 18 | // |
| 19 | // The identifier is all it answers. A link is a credential, and the |
| 20 | // room already has a share flow that mints one when a member asks for |
| 21 | // it (Client.ShareLink), so nothing that merely starts a meeting has to |
| 22 | // hold one, log one, or decide when to forget it. |
| 23 | // |
| 24 | // The session is the caller's: an ordinary browser session carried in |
| 25 | // the client's cookie jar, exactly as Room uses. Nothing here mints or |
| 26 | // accepts an agent bearer token. |
| 27 | func StartMeeting(ctx context.Context, origin string, client *http.Client) (string, error) { |
| 28 | return StartMeetingIn(ctx, origin, "", client) |
| 29 | } |
| 30 | |
| 31 | // StartMeetingIn is StartMeeting naming the app's IANA time zone, so the |
| 32 | // title the server writes ("Call, 2 Oct 15:40") is the starter's own time |
| 33 | // rather than the instance's. An empty or unknown zone is the instance's. |
| 34 | func StartMeetingIn(ctx context.Context, origin, zone string, client *http.Client) (string, error) { |
| 35 | trimmed, err := checkOrigin(origin) |
| 36 | if err != nil { |
| 37 | return "", err |
| 38 | } |
| 39 | safe, err := safeClient(client) |
| 40 | if err != nil { |
| 41 | return "", err |
| 42 | } |
| 43 | ctx, cancel := context.WithTimeout(ctx, 15*time.Second) |
| 44 | defer cancel() |
| 45 | req, err := http.NewRequestWithContext(ctx, http.MethodPost, trimmed+"/native/meetings/start", bytes.NewReader(startBody(zone))) |
| 46 | if err != nil { |
| 47 | return "", errors.New("cannot build Calls request") |
| 48 | } |
| 49 | req.Header.Set("Accept", "application/json") |
| 50 | // Both locks the server asks for: the content type an HTML form |
| 51 | // cannot send, and the origin csrf.Protect reads. A POST carrying |
| 52 | // neither is refused before the handler sees it. |
| 53 | req.Header.Set("Content-Type", "application/json") |
| 54 | req.Header.Set("Origin", trimmed) |
| 55 | res, err := safe.Do(req) |
| 56 | if err != nil { |
| 57 | return "", errors.New("cannot reach Calls") |
| 58 | } |
| 59 | defer res.Body.Close() |
| 60 | switch { |
| 61 | case res.StatusCode == http.StatusOK: |
| 62 | case res.StatusCode == http.StatusUnauthorized, res.StatusCode == http.StatusSeeOther: |
| 63 | // The session went while the app was holding it. Redirects are |
| 64 | // never followed here, so a sign-in page arrives as its 303 and |
| 65 | // is read as one rather than decoded as JSON. |
| 66 | return "", errors.New("sign in to Calls again") |
| 67 | case res.StatusCode == http.StatusForbidden, res.StatusCode == http.StatusNotFound: |
| 68 | // requireMember's refusal. A guest may join a meeting and may |
| 69 | // not start one, and saying which would tell an outsider |
| 70 | // something about the team. |
| 71 | return "", errors.New("this account cannot start meetings on that Calls server") |
| 72 | default: |
| 73 | return "", errors.New("cannot start a meeting just now") |
| 74 | } |
| 75 | var out struct { |
| 76 | Sqid string `json:"sqid"` |
| 77 | } |
| 78 | if json.NewDecoder(io.LimitReader(res.Body, maxResponse)).Decode(&out) != nil || !validRoom(out.Sqid) { |
| 79 | return "", errors.New("Calls answered with a meeting this app cannot open") |
| 80 | } |
| 81 | return out.Sqid, nil |
| 82 | } |
| 83 | |
| 84 | // RegisterDevice tells the server where this device can be reached when |
| 85 | // the app is not running. |
| 86 | // |
| 87 | // Best effort by design, and the caller treats a failure as nothing |
| 88 | // happening: a device that could not register is a device that will not |
| 89 | // be told about a knock, which is exactly where every device was before |
| 90 | // push existed. It is never a reason to fail a join. |
| 91 | func RegisterDevice(ctx context.Context, origin string, client *http.Client, token, platform string) error { |
| 92 | trimmed, err := checkOrigin(origin) |
| 93 | if err != nil { |
| 94 | return err |
| 95 | } |
| 96 | safe, err := safeClient(client) |
| 97 | if err != nil { |
| 98 | return err |
| 99 | } |
| 100 | if platform != "ios" && platform != "macos" { |
| 101 | return errors.New("unknown device platform") |
| 102 | } |
| 103 | body, err := json.Marshal(map[string]string{"token": token, "platform": platform}) |
| 104 | if err != nil { |
| 105 | return errors.New("cannot build Calls request") |
| 106 | } |
| 107 | ctx, cancel := context.WithTimeout(ctx, 15*time.Second) |
| 108 | defer cancel() |
| 109 | req, err := http.NewRequestWithContext(ctx, http.MethodPost, trimmed+"/native/devices", bytes.NewReader(body)) |
| 110 | if err != nil { |
| 111 | return errors.New("cannot build Calls request") |
| 112 | } |
| 113 | req.Header.Set("Accept", "application/json") |
| 114 | req.Header.Set("Content-Type", "application/json") |
| 115 | req.Header.Set("Origin", trimmed) |
| 116 | res, err := safe.Do(req) |
| 117 | if err != nil { |
| 118 | return errors.New("cannot reach Calls") |
| 119 | } |
| 120 | defer res.Body.Close() |
| 121 | switch { |
| 122 | case res.StatusCode == http.StatusNoContent: |
| 123 | return nil |
| 124 | case res.StatusCode == http.StatusNotFound: |
| 125 | // An older server without the endpoint. Not an error worth |
| 126 | // showing anyone: it simply has no push. |
| 127 | return errors.New("this Calls server does not take device registrations") |
| 128 | default: |
| 129 | return errors.New("Calls refused this device registration") |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | // startBody is the start request: an empty object, or the zone when the |
| 134 | // app knows it. A zone too long to be an IANA name is left out rather |
| 135 | // than sent for the server to refuse. |
| 136 | func startBody(zone string) []byte { |
| 137 | if zone == "" || len(zone) > 64 { |
| 138 | return []byte("{}") |
| 139 | } |
| 140 | b, _ := json.Marshal(map[string]string{"zone": zone}) |
| 141 | return b |
| 142 | } |
| 143 | |
amadan