Signature.proto

syntax = "proto3";

message Signature {

    message LocationFix {
        string provider = 1; // "network", "gps", "fused", possibly others
        uint64 timestamp_since_start = 2; // in ms
        float latitude = 13;
        float longitude = 14;

        // ??? shows up in struct, dunno where these go
        // float device_speed;
        // float device_course;
        float horizontal_accuracy = 20; // iOS only? (range seems to be -1 to +1)
        float altitude = 21;
        float vertical_accuracy = 22; // iOS only? (range seems to be ~10-12)
        uint64 provider_status = 26; // Usually 3 (possibly GPS status: 1 = no fix, 2 = acquiring/inaccurate, 3 = fix acquired)
                           // On iOS there are some LocationFixes with unk26=1 and everything else empty
        uint32 floor = 27; // No idea what this is, seems to be optional
        uint64 location_type = 28; // Always 1 (if there is data at all)
    }

    // don't really care about this since we're not using it
    message AndroidGpsInfo {
        uint64 time_to_fix = 1;
        repeated int32 satellites_prn = 2;
        repeated float snr = 3;
        repeated float azimuth = 4;
        repeated float elevation = 5; 
        repeated bool has_almanac = 6;
        repeated bool has_ephemeris = 7;
        repeated bool used_in_fix = 8;
    }

    message SensorInfo {
        uint64 timestamp_snapshot = 1; // in ms
        double magnetometer_x = 3;
        double magnetometer_y = 4;
        double magnetometer_z = 5;
        double angle_normalized_x = 6;
        double angle_normalized_y = 7;
        double angle_normalized_z = 8;
        double accel_raw_x = 10;
        double accel_raw_y = 11;
        double accel_raw_z = 12;
        double gyroscope_raw_x = 13;
        double gyroscope_raw_y = 14;
        double gyroscope_raw_z = 15;
        double accel_normalized_x = 16;
        double accel_normalized_y = 17;
        double accel_normalized_z = 18;
        uint64 accelerometer_axes = 19; // Always 3
    }

    message DeviceInfo {
        string device_id = 1; // Hex string
        string android_board_name = 2;
        string android_bootloader = 3;
        string device_brand = 4; // On Android: product.brand
        string device_model = 5; // On Android: product.device
        string device_model_identifier = 6; // Android only, build.display.id
        string device_model_boot = 7;  // On Android: boot.hardware
        string hardware_manufacturer = 8; // On Android: product.manufacturer
        string hardware_model = 9;  // On Android: product.model
        string firmware_brand = 10; // On Android: product.name, on iOS: "iPhone OS"
        string firmware_tags = 12; // Android only, build.tags
        string firmware_type = 13; // On Android: build.type, on iOS instead: iOS version
        string firmware_fingerprint = 14; // Android only, build.fingerprint
    }

    // Apparently iOS only
    message iOSActivityStatus {
        // all of these had 1 as their value
        uint64 start_time_ms = 1
        bool unknown_status = 2
        bool walking = 3
        bool running = 4
        bool stationary = 5
        bool automotive = 6
        bool tilting = 7
        bool cycling = 8
        bytes status = 9
    }

    uint64 timestamp_since_start = 2; // in ms
    repeated LocationFix location_fix = 4;
    AndroidGpsInfo gps_info = 5;
    SensorInfo sensor_info = 7;
    DeviceInfo device_info = 8;
    iOSActivityStatus activity_status = 9;
    uint32 location_hash1 = 10; // Location1 hashed based on the auth_token - xxHash32
    uint32 location_hash2 = 20; // Location2 hashed based on the auth_token - xxHash32
    bytes unk22 = 22; // possibly replay check. Generation unknown but pointed to by 0001B8614
    uint64 timestamp = 23; // epoch timestamp in ms
    repeated uint64 request_hash = 24; // hashes of each request message in a hashArray - xxhash64

    // Addresses for the corresponding hash functions:
    //    xxHash32              00054D28
    //    xxhash64              000546C8 - Feeds into 00053D40

}