bug fix: handle lf linebreak before boundary

Author: suikabreaker

lib/resty/upload.lua

@@ -45,12 +45,12 @@ local function get_boundary()
     return match(header, ";%s*boundary=([^\",;]+)")
 end
 
-local function read_line_construct(sock, lf_line_break)
+local function read_line_construct(sock, boundary, lf_line_break)
     local line_end = "\r\n"
     if lf_line_break then
         line_end = "\n"
     end
-    local read_line, err = sock:receiveuntil(line_end)
+    local read_line, err = sock:receiveuntil(line_end .. boundary)
     if lf_line_break and read_line then
         return function (arg)
             local ret, err_inner = read_line(arg)
@@ -65,7 +65,7 @@ local function read_line_construct(sock, lf_line_break)
 end
 
 function _M.new(self, chunk_size, max_line_size, lf_line_break)
-    local boundary = get_boundary()
+    local boundary = "--" .. get_boundary()
 
     -- print("boundary: ", boundary)
 
@@ -80,12 +80,12 @@ function _M.new(self, chunk_size, max_line_size, lf_line_break)
         return nil, err
     end
 
-    local read2boundary, err = sock:receiveuntil("--" .. boundary)
+    local read2boundary, err = sock:receiveuntil(boundary)
     if not read2boundary then
         return nil, err
     end
 
-    local read_line, err = read_line_construct(sock, lf_line_break)
+    local read_line, err = read_line_construct(sock, "", lf_line_break)
     if not read_line then
         return nil, err
     end
@@ -273,7 +273,7 @@ local function read_preamble(self)
         return nil, nil, err
     end
 
-    local read2boundary, err = sock:receiveuntil("\r\n--" .. self.boundary)
+    read2boundary, err = read_line_construct(sock, self.boundary, self.lf_line_break)
     if not read2boundary then
         return nil, nil, err
     end