local ffi = require("ffi")
local authlib = ffi.load("/gateway/auth/main/libauth.so")

ffi.cdef([[
  typedef long long GoInt64;
  typedef unsigned long long GoUint64;
  typedef GoInt64 GoInt;
  typedef struct { const char *p; GoInt n; } GoString;
  extern GoInt Authenticate(GoString p0);

]]);

local result = 0
local typeString = ffi.typeof("GoString")

if ngx.var.http_Authorization and string.len(ngx.var.http_Authorization) > 0 then
        local  accessTokenString= typeString(ngx.var.http_Authorization, string.len(ngx.var.http_Authorization))
        result = authlib.Authenticate(accessTokenString)
    
      if tonumber(result)~=0 then
        -- proceed to route to upstream
      else
        return ngx.exit(ngx.HTTP_UNAUTHORIZED)  
      end

else
 return ngx.exit(ngx.HTTP_UNAUTHORIZED)  
end