通道 API 端点

通道是 Capgo 中管理应用程序更新的核心机制。在自托管模式下，您需要实现通道端点来处理设备分配、通道查询和通道管理操作。

了解渠道

渠道允许您：

控制更新分发：将不同的应用程序版本分配给不同的用户组
A/B 测试：针对特定用户群测试新功能
分阶段推出：逐步部署更新以最大程度地降低风险
环境分离：单独的开发、暂存和生产更新

配置

在 capacitor.config.json 中配置通道端点 URL：

{
  "plugins": {
    "CapacitorUpdater": {
      "channelUrl": "https://myserver.com/api/channel_self"
    }
  }
}

渠道运营

该插件执行您的端点需要处理的不同通道操作：

1. 列出兼容频道（GET 请求）

当插件调用 listChannels() 时，它会发送 GET 请求以检索与设备兼容的所有通道。这将返回与设备环境（开发/产品、模拟器/真实设备）匹配的通道，并允许公共访问或自分配。

请求格式

// GET /api/channel_self
// Headers:
{
  "Content-Type": "application/json"
}

// Query parameters:
interface ListChannelsRequest {
  app_id: string
  platform: "ios" | "android" | "electron"
  is_emulator: boolean
  is_prod: boolean
  key_id?: string
}

响应格式

[
  {
    "id": 1,
    "name": "production",
    "public": true,
    "allow_self_set": false
  },
  {
    "id": 2,
    "name": "beta",
    "public": false,
    "allow_self_set": true
  }
]

了解渠道类型

响应包括每个通道的两个重要标志：

public: true：这是一个默认频道。设备无法使用 setChannel() 自行分配给它。相反，如果设备删除其通道分配（使用 unsetChannel()），则如果该公共通道符合设备条件，它将自动接收来自此公共通道的更新。
allow_self_set: true：这是一个可自行分配的通道。设备可以使用 setChannel() 显式地将自己分配给此通道。这对于 beta 测试、A/B 测试或允许用户选择特定的更新轨道非常有用。

2. 获取频道（PUT 请求）

当插件调用 getChannel() 时，它会发送 PUT 请求以检索设备的当前通道分配。

请求格式

// PUT /api/channel_self
// Headers:
{
  "Content-Type": "application/json"
}

// Body:
interface GetChannelRequest {
  device_id: string
  app_id: string
  platform: "ios" | "android" | "electron"
  plugin_version: string
  version_build: string
  version_code: string
  version_name: string
  is_emulator: boolean
  is_prod: boolean
  defaultChannel?: string
  channel?: string  // For newer plugin versions, contains local channel override
}

响应格式

{
  "status": "ok",
  "channel": "production",
  "allowSet": true,
  "message": "",
  "error": ""
}

3. 设置频道（POST 请求）

当插件调用 setChannel() 时，它会发送 POST 请求以将设备分配到特定通道。

请求格式

// POST /api/channel_self
interface SetChannelRequest {
  device_id: string
  app_id: string
  channel: string
  platform: "ios" | "android" | "electron"
  plugin_version: string
  version_build: string
  version_code: string
  version_name: string
  is_emulator: boolean
  is_prod: boolean
}

响应格式

{
  "status": "ok",
  "message": "Device assigned to channel successfully",
  "error": ""
}

错误案例

当设备尝试将自己分配给公共频道（带有 public: true 的频道）时，您的端点应返回错误：

{
  "status": "error",
  "error": "public_channel_self_set_not_allowed",
  "message": "This channel is public and does not allow device self-assignment. Unset the channel and the device will automatically use the public channel."
}

当设备尝试将自己分配给不允许自行分配的通道时：

{
  "status": "error",
  "error": "channel_self_set_not_allowed",
  "message": "This channel does not allow devices to self associate"
}

4. 取消设置频道（删除请求）

当插件调用 unsetChannel() 时，它会发送一个 DELETE 请求以删除设备的通道分配。

请求格式

// DELETE /api/channel_self
interface UnsetChannelRequest {
  device_id: string
  app_id: string
  platform: "ios" | "android" | "electron"
  plugin_version: string
  version_build: string
  version_code: string
  version_name: string
}

实现示例

以下是如何实现通道端点的 JavaScript 示例：

interface ChannelRequest {
  device_id: string
  app_id: string
  channel?: string
  platform: "ios" | "android" | "electron"
  plugin_version: string
  version_build: string
  version_code: string
  version_name: string
}

interface ChannelResponse {
  status: "ok" | "error"
  channel?: string
  allowSet?: boolean
  message?: string
  error?: string
}

export const handler = async (event) => {
  const method = event.httpMethod || event.method
  const body = JSON.parse(event.body || '{}') as ChannelRequest

  const { device_id, app_id, channel, platform } = body

  try {
    switch (method) {
      case 'GET':
        return await getDeviceChannel(device_id, app_id)

      case 'POST':
        return await setDeviceChannel(device_id, app_id, channel!, platform)

      case 'DELETE':
        return await unsetDeviceChannel(device_id, app_id)

      default:
        return {
          status: "error",
          error: "Method not allowed"
        }
    }
  } catch (error) {
    return {
      status: "error",
      error: error.message
    }
  }
}

async function getDeviceChannel(deviceId: string, appId: string): Promise<ChannelResponse> {
  // Query your database for device channel assignment
  const assignment = await database.getDeviceChannel(deviceId, appId)

  if (assignment) {
    return {
      status: "ok",
      channel: assignment.channel,
      allowSet: assignment.allowSelfAssign
    }
  }

  // Return default channel if no assignment found
  return {
    status: "ok",
    channel: "production", // Your default channel
    allowSet: true
  }
}

async function setDeviceChannel(
  deviceId: string,
  appId: string,
  channel: string,
  platform: string
): Promise<ChannelResponse> {
  // Validate channel exists and allows self-assignment
  const channelConfig = await database.getChannelConfig(channel, appId)

  if (!channelConfig) {
    return {
      status: "error",
      error: "Channel not found"
    }
  }

  if (!channelConfig.allowDeviceSelfSet) {
    return {
      status: "error",
      error: "Channel does not allow self-assignment"
    }
  }

  // Check platform restrictions
  if (platform === "ios" && !channelConfig.ios) {
    return {
      status: "error",
      error: "Channel not available for iOS"
    }
  }

  if (platform === "android" && !channelConfig.android) {
    return {
      status: "error",
      error: "Channel not available for Android"
    }
  }

  if (platform === "electron" && !channelConfig.electron) {
    return {
      status: "error",
      error: "Channel not available for Electron"
    }
  }

  // Save the assignment
  await database.setDeviceChannel(deviceId, appId, channel)

  return {
    status: "ok",
    message: "Device assigned to channel successfully"
  }
}

async function unsetDeviceChannel(deviceId: string, appId: string): Promise<ChannelResponse> {
  // Remove device channel assignment
  await database.removeDeviceChannel(deviceId, appId)

  return {
    status: "ok",
    message: "Device channel assignment removed"
  }
}

通道配置

您的频道系统应支持以下配置选项：

interface ChannelConfig {
  name: string
  appId: string

  // Platform targeting
  ios: boolean              // Allow updates to iOS devices
  android: boolean          // Allow updates to Android devices
  electron: boolean         // Allow updates to Electron apps

  // Device type restrictions
  allow_emulator: boolean   // Allow updates on emulator/simulator devices
  allow_device: boolean     // Allow updates on real/physical devices

  // Build type restrictions
  allow_dev: boolean        // Allow updates on development builds (is_prod=false)
  allow_prod: boolean       // Allow updates on production builds (is_prod=true)

  // Channel assignment
  public: boolean           // Default channel - devices fall back to this when no override
  allowDeviceSelfSet: boolean  // Allow devices to self-assign via setChannel()

  // Update policies
  disableAutoUpdate: "major" | "minor" | "version_number" | "none"
  disableAutoUpdateUnderNative: boolean
}

设备过滤逻辑列出兼容频道（GET 请求）时，您应根据以下条件过滤频道：

平台检查：通道必须允许设备的平台（ios、android 或 electron）
设备类型检查：
- 如果 is_emulator=true：通道必须有 allow_emulator=true
- 如果 is_emulator=false：频道必须有 allow_device=true
构建类型检查：
- 如果 is_prod=true：频道必须有 allow_prod=true
- 如果 is_prod=false：通道必须有 allow_dev=true
可见性检查：通道必须是 public=true 或 allow_device_self_set=true

// Example filtering logic
function getCompatibleChannels(
  platform: 'ios' | 'android' | 'electron',
  isEmulator: boolean,
  isProd: boolean,
  channels: ChannelConfig[]
): ChannelConfig[] {
  return channels.filter(channel => {
    // Platform check
    if (!channel[platform]) return false

    // Device type check
    if (isEmulator && !channel.allow_emulator) return false
    if (!isEmulator && !channel.allow_device) return false

    // Build type check
    if (isProd && !channel.allow_prod) return false
    if (!isProd && !channel.allow_dev) return false

    // Must be accessible (public or self-assignable)
    if (!channel.public && !channel.allowDeviceSelfSet) return false

    return true
  })
}

数据库架构示例

您需要存储通道配置和设备分配：

-- Channels table
CREATE TABLE channels (
  id SERIAL PRIMARY KEY,
  name VARCHAR(255) NOT NULL,
  app_id VARCHAR(255) NOT NULL,

  -- Platform targeting
  ios BOOLEAN DEFAULT true,
  android BOOLEAN DEFAULT true,
  electron BOOLEAN DEFAULT true,

  -- Device type restrictions
  allow_emulator BOOLEAN DEFAULT true,   -- Allow emulator/simulator devices
  allow_device BOOLEAN DEFAULT true,     -- Allow real/physical devices

  -- Build type restrictions
  allow_dev BOOLEAN DEFAULT true,        -- Allow development builds
  allow_prod BOOLEAN DEFAULT true,       -- Allow production builds

  -- Channel assignment
  public BOOLEAN DEFAULT false,          -- Default channel (fallback)
  allow_device_self_set BOOLEAN DEFAULT false,  -- Allow self-assignment

  -- Update policies
  disable_auto_update VARCHAR(50) DEFAULT 'none',
  disable_auto_update_under_native BOOLEAN DEFAULT false,

  created_at TIMESTAMP DEFAULT NOW(),
  UNIQUE(name, app_id)
);

-- Device channel assignments table
CREATE TABLE device_channels (
  id SERIAL PRIMARY KEY,
  device_id VARCHAR(255) NOT NULL,
  app_id VARCHAR(255) NOT NULL,
  channel_name VARCHAR(255) NOT NULL,
  assigned_at TIMESTAMP DEFAULT NOW(),
  UNIQUE(device_id, app_id)
);

错误处理

处理常见错误场景：

// Channel not found
{
  "status": "error",
  "error": "Channel 'beta' not found"
}

// Self-assignment not allowed
{
  "status": "error",
  "error": "Channel does not allow device self-assignment"
}

// Platform not supported
{
  "status": "error",
  "error": "Channel not available for this platform"
}

// Invalid request
{
  "status": "error",
  "error": "Missing required field: device_id"
}

最佳实践

安全性：根据您的业务规则验证所有渠道分配
日志记录：记录所有通道操作，以便审计和调试
性能：缓存通道配置以减少数据库查询
验证：验证device_id和app_id真实性
速率限制：实施速率限制以防止滥用

与更新集成

通道分配与您的更新 API 端点协同工作。当设备请求更新时，检查其通道分配以确定要提供的版本：

async function getUpdateForDevice(deviceId: string, appId: string) {
  // Get device's channel assignment
  const channelAssignment = await getDeviceChannel(deviceId, appId)
  const channel = channelAssignment.channel || 'production'

  // Get the version assigned to this channel
  const channelVersion = await getChannelVersion(channel, appId)

  return {
    version: channelVersion.version,
    url: channelVersion.url,
    checksum: channelVersion.checksum
  }
}

这将创建一个完整的自托管渠道管理系统，使您可以完全控制如何将更新分发给用户。