feat: files go in 4 MB pieces, several at once and each retried on its own, so they pass a proxy like Cloudflare and survive a bad link (0.0.8)

internal/proto/proto.go

@@ -85,8 +85,8 @@ const (
 	TaskFSZip      = "fs.zip"      // zip selected paths (native archive/zip)
 	TaskFSMove     = "fs.move"     // move/rename
 	TaskFSDownload = "fs.download" // read a whole file (larger cap) for browser download
-	TaskFSUpload   = "fs.upload"   // write a file from a stream the agent fetches (0.0.7+)
-	TaskFSGet      = "fs.get"      // send a file as a stream the agent posts (0.0.7+)
+	TaskFSPut      = "fs.put"      // write a file the browser sends in pieces (0.0.8+)
+	TaskFSSend     = "fs.send"     // send a file to the browser in pieces (0.0.8+)
 
 	TaskSysUpdate  = "sys.update"  // download the latest agent binary and restart
 	TaskSysUsers   = "sys.users"   // report the agent's user and the login-capable users
@@ -99,17 +99,17 @@ const (
 // file be edited only when it fits, so that a save never cuts it short.
 const FSReadCap = 5 * 1024 * 1024
 
-// FSFileCap bounds a file sent either way as a stream (TaskFSUpload,
-// TaskFSGet).
+// FSFileCap bounds a file sent either way in pieces (TaskFSPut, TaskFSSend).
 const FSFileCap = 512 << 20
 
-// FSStreamArgs are the arguments of TaskFSUpload and TaskFSGet: the file, and
-// the stream on the server that carries its bytes (GET it for an upload, POST
-// to it for a download). Size is the upload's length, -1 when not known.
-type FSStreamArgs struct {
-	Path   string `json:"path"`
-	Stream string `json:"stream"`
-	Size   int64  `json:"size"`
+// FSXferArgs are the arguments of TaskFSPut and TaskFSSend: the file, and the
+// transfer on the server whose pieces carry it - GET them for a put, POST them
+// for a send, Chunk bytes each. Size is a put's length; -1 for a send.
+type FSXferArgs struct {
+	Path  string `json:"path"`
+	Xfer  string `json:"xfer"`
+	Size  int64  `json:"size"`
+	Chunk int    `json:"chunk"`
 }
 
 // TaskEnvelope is what the agent fetches for a task id.