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。

desktop/platform/clipboard_darwin.m

@@ -0,0 +1,42 @@
+#import <Cocoa/Cocoa.h>
+#include <stdlib.h>
+#include <string.h>
+
+// cdropPasteboardChangeCount returns the general pasteboard's monotonic change
+// counter. Polling it is the cheap way to detect a copy without a callback API.
+long cdropPasteboardChangeCount(void) {
+    return (long)[[NSPasteboard generalPasteboard] changeCount];
+}
+
+// cdropPasteboardReadText returns a malloc'd UTF-8 copy of the pasteboard's
+// plain-text payload (caller frees), or NULL when there is no text (image /
+// file only). It sets *sensitive to 1 when a privacy marker type is present —
+// org.nspasteboard.{Concealed,Transient,AutoGenerated}Type — so the upload
+// policy can skip it. (Most password managers set no marker; this is a
+// best-effort secondary guard behind the server's short TTL.)
+char *cdropPasteboardReadText(int *sensitive) {
+    NSPasteboard *pb = [NSPasteboard generalPasteboard];
+    *sensitive = 0;
+    for (NSString *type in pb.types) {
+        if ([type isEqualToString:@"org.nspasteboard.ConcealedType"] ||
+            [type isEqualToString:@"org.nspasteboard.TransientType"] ||
+            [type isEqualToString:@"org.nspasteboard.AutoGeneratedType"]) {
+            *sensitive = 1;
+            break;
+        }
+    }
+    NSString *s = [pb stringForType:NSPasteboardTypeString];
+    if (s == nil) { return NULL; }
+    const char *utf8 = [s UTF8String];
+    if (utf8 == NULL) { return NULL; }
+    return strdup(utf8);
+}
+
+// cdropPasteboardWriteText replaces the pasteboard's contents with plain text.
+void cdropPasteboardWriteText(const char *text) {
+    NSString *s = [NSString stringWithUTF8String:text];
+    if (s == nil) { return; }
+    NSPasteboard *pb = [NSPasteboard generalPasteboard];
+    [pb clearContents];
+    [pb setString:s forType:NSPasteboardTypeString];
+}