cdrop — 跨 OS 剪贴板与文件传输服务
Commilitia Drop：自托管的跨设备剪贴板同步与点对点文件传输。 - 后端 Go（chi / SQLite WAL / SSE Hub / WebRTC signaling + 状态机 / Relay ring buffer），编译进单个 distroless 镜像（前端 go:embed）。 - 前端 React + TanStack Router + Zustand，自实现 SSE + WebRTC P2P，NAT 受阻时回退服务端中继；聚珍（Juzhen）CJK 综合排版。 - 桌面端 Wails v2（macOS / Windows），瘦客户端复用 web。 - 鉴权 OIDC PKCE（自建 Casdoor 等），refresh_token 信封加密存系统密钥库；iOS Shortcut 用 HS256 scoped token。 架构文档与变更记录见 docs 分支（PROJECT_BRIEF / FRONTEND_DESIGN / CHANGELOG）。 本次为公开发布初始提交：完整开发历史（含部署细节）留存于私有归档，公开仓库自此干净起步。
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package config
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import (
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/knadh/koanf/parsers/yaml"
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"github.com/knadh/koanf/providers/env/v2"
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"github.com/knadh/koanf/providers/file"
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"github.com/knadh/koanf/v2"
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)
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const envPrefix = "CDROP_"
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type Config struct {
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AuthMode string `koanf:"auth_mode"`
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DevToken string `koanf:"dev_token"`
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DBPath string `koanf:"db_path"`
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Listen string `koanf:"listen"`
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// DeviceTTLHours is the maximum age of a row in `devices` before the
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// background sweeper deletes it. Brief §2 sets the refresh_token sliding
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// window at 196h (≈8 days) — devices must not outlive that. Default 196h.
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DeviceTTLHours int `koanf:"device_ttl_hours"`
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// OIDC settings. Generic OAuth/OIDC provider compatible (Casdoor included).
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OIDCAuthorizeURL string `koanf:"oidc_authorize_url"`
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OIDCTokenURL string `koanf:"oidc_token_url"`
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OIDCJWKSURL string `koanf:"oidc_jwks_url"`
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OIDCIssuer string `koanf:"oidc_issuer"`
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// OIDCAudience accepts a comma-separated list. A token passes when its `aud`
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// matches any one entry — this lets one backend serve several OAuth clients
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// that carry different audiences (e.g. the web app and the desktop client).
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// Empty disables audience checking; a single value behaves as before.
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OIDCAudience string `koanf:"oidc_audience"`
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OIDCClientID string `koanf:"oidc_client_id"`
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OIDCClientSecret string `koanf:"oidc_client_secret"`
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OIDCRedirectURI string `koanf:"oidc_redirect_uri"`
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OIDCScopes string `koanf:"oidc_scopes"`
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HS256Secret string `koanf:"hs256_secret"`
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// Shortcut tokens：iOS 快捷指令用的长效 HS256 token。TTLDays 是签发有效期
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// （默认 365 天），MaxPerUser 是每用户未吊销且未过期的 token 上限（默认 10）。
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// 需配 HS256Secret 才启用，否则签发端点返回 503。
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ShortcutTokenTTLDays int `koanf:"shortcut_token_ttl_days"`
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ShortcutMaxPerUser int `koanf:"shortcut_max_per_user"`
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// Cloudflare Realtime TURN (https://developers.cloudflare.com/realtime/turn/).
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// When both fields are set, /api/calls/credentials returns short-lived
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// TLS-capable TURN creds (turns:turn.cloudflare.com:5349); otherwise the
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// endpoint serves a STUN-only fallback so dev / no-CF deploys still work.
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CFTurnKeyID string `koanf:"cf_turn_key_id"`
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CFTurnAPIToken string `koanf:"cf_turn_api_token"`
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// Clipboard：单条覆写式同步。MaxBytes 限制单次写入字节数；DebounceSec 是
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// 收到 PUT 后等待"无新写入稳定窗口"的秒数，到期才广播 SSE。同窗口内的
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// 后续 PUT 直接刷新 generation 让旧广播取消。
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ClipboardMaxBytes int `koanf:"clipboard_max_bytes"`
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ClipboardDebounceSec int `koanf:"clipboard_debounce_sec"`
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// ClipboardTTLSec 是云剪贴板内容的存活秒数。因为无法可靠区分密码与普通
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// 文本（密码.app / 浏览器扩展复制都不打敏感标记），改以短 TTL 限制暴露面：
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// 内容超过 TTL 后 GET 返回空，后台 sweeper 亦清除其 content。0 = 不过期。
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ClipboardTTLSec int `koanf:"clipboard_ttl_sec"`
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}
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// Load reads config from optional ./config.yaml then overrides with CDROP_* env.
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// Validates dev/prod invariants; returns error if invariants are violated.
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func Load() (*Config, error) {
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k := koanf.New(".")
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k.Set("auth_mode", "prod")
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k.Set("db_path", "./cdrop.db")
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k.Set("listen", ":8080")
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k.Set("device_ttl_hours", 196)
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k.Set("oidc_scopes", "openid profile email")
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k.Set("clipboard_max_bytes", 65536)
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k.Set("clipboard_debounce_sec", 3)
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k.Set("shortcut_token_ttl_days", 365)
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k.Set("shortcut_max_per_user", 10)
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if _, err := os.Stat("config.yaml"); err == nil {
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if err := k.Load(file.Provider("config.yaml"), yaml.Parser()); err != nil {
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return nil, fmt.Errorf("load config.yaml: %w", err)
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}
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}
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envProvider := env.Provider(".", env.Opt{
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Prefix: envPrefix,
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TransformFunc: func(key, value string) (string, any) {
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return strings.ToLower(strings.TrimPrefix(key, envPrefix)), value
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},
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})
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if err := k.Load(envProvider, nil); err != nil {
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return nil, fmt.Errorf("load env: %w", err)
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}
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cfg := &Config{}
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if err := k.Unmarshal("", cfg); err != nil {
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return nil, fmt.Errorf("unmarshal config: %w", err)
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}
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if err := cfg.validate(); err != nil {
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return nil, err
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}
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return cfg, nil
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}
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func (c *Config) validate() error {
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switch c.AuthMode {
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case "dev":
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if c.DevToken == "" {
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return errors.New("CDROP_AUTH_MODE=dev requires CDROP_DEV_TOKEN; refusing to start")
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}
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case "prod":
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// Audience MUST be set in prod (R6). With it empty, RS256 audience
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// checking is skipped entirely, so ANY token the IdP mints for ANY
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// application sharing this JWKS would validate here — a user of a
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// sibling Casdoor app could impersonate a cdrop user. The web + desktop
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// client_ids go in CDROP_OIDC_AUDIENCE (comma-separated); refuse to boot
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// without it rather than run wide open.
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if c.OIDCAudience == "" {
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return errors.New(
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"CDROP_AUTH_MODE=prod requires CDROP_OIDC_AUDIENCE " +
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"(comma-separated OAuth client_ids); refusing to start")
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}
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default:
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return fmt.Errorf("CDROP_AUTH_MODE must be \"dev\" or \"prod\", got %q", c.AuthMode)
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}
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return nil
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}
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