mtcute/packages/core/src/utils/dcs.ts

import { TlBinaryReader, TlBinaryWriter } from '@mtcute/tl-runtime'

export interface BasicDcOption {
    ipAddress: string
    port: number
    id: number
    ipv6?: boolean
    mediaOnly?: boolean
    testMode?: boolean
}

export function serializeBasicDcOption(dc: BasicDcOption): Uint8Array {
    const writer = TlBinaryWriter.manual(64)

    const flags = (dc.ipv6 ? 1 : 0)
      | (dc.mediaOnly ? 2 : 0)
      | (dc.testMode ? 4 : 0)
    writer.raw(
        new Uint8Array([
            2, // version
            dc.id,
            flags,
        ]),
    )

    writer.string(dc.ipAddress)
    writer.int(dc.port)

    return writer.result()
}

export function parseBasicDcOption(data: Uint8Array): BasicDcOption | null {
    const reader = TlBinaryReader.manual(data)

    const [version, id, flags] = reader.raw(3)
    if (version !== 1 && version !== 2) return null

    const ipAddress = reader.string()
    const port = reader.int()

    return {
        id,
        ipAddress,
        port,
        ipv6: (flags & 1) !== 0,
        mediaOnly: (flags & 2) !== 0,
        testMode: version === 2 && (flags & 4) !== 0,
    }
}

export interface DcOptions {
    main: BasicDcOption
    media: BasicDcOption
}

export const defaultProductionDc: DcOptions = {
    main: {
        ipAddress: '149.154.167.50',
        port: 443,
        id: 2,
    },
    media: {
        ipAddress: '149.154.167.222',
        port: 443,
        id: 2,
        mediaOnly: true,
    },
}

export const defaultProductionIpv6Dc: DcOptions = {
    main: {
        ipAddress: '2001:067c:04e8:f002:0000:0000:0000:000a',
        ipv6: true,
        port: 443,
        id: 2,
    },
    media: {
        ipAddress: '2001:067c:04e8:f002:0000:0000:0000:000b',
        ipv6: true,
        port: 443,
        id: 2,
        mediaOnly: true,
    },
}

export const defaultTestDc: DcOptions = {
    main: {
        ipAddress: '149.154.167.40',
        port: 443,
        id: 2,
        testMode: true,
    },
    media: {
        ipAddress: '149.154.167.40',
        port: 443,
        id: 2,
        mediaOnly: true,
        testMode: true,
    },
}

export const defaultTestIpv6Dc: DcOptions = {
    main: {
        ipAddress: '2001:67c:4e8:f002::e',
        port: 443,
        ipv6: true,
        id: 2,
        testMode: true,
    },
    media: {
        ipAddress: '2001:67c:4e8:f002::e',
        port: 443,
        ipv6: true,
        id: 2,
        mediaOnly: true,
        testMode: true,
    },
}