Like the title suggest, the code below renders an html link and when the user clicks it an event creates an SSH connection to log into another server, grab a file and download the file to the users download folder.
If there is an easier way to do this please let me know.
The code below partially works but there are two problems.
Problem 1. When the user clicks the link, the file downloads as expected, but if the user clicks it again, it doesn’t work unless the page is refreshed. I assume this might be fixable with a redirect of some sort, but nothing I’ve done seems to work.
Problem 2. I get this error and I am not sure how to proceed as I do not understand it.
[error] Ranch listener AppWeb.Endpoint.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.1027.0> exit with reason: {:function_clause, [{:cowboy_http, :commands, [{:state, #PID<0.602.0>, AppWeb.Endpoint.HTTP, #Port<0.63>, :ranch_tcp, :undefined, %{env: %{dispatch: [{:_, [], [{:_, [], Plug.Cowboy.Handler, {Phoenix.Endpoint.SyncCodeReloadPlug, {AppWeb.Endpoint, []}}}]}]}, stream_handlers: [:cowboy_telemetry_h, :cowboy_stream_h]}, "", %{}, {{10, 26, 10, 126}, 50238}, {{172, 30, 0, 95}, 80}, :undefined, #Reference<0.4223096848.725614593.72607>, true, 6, {:ps_request_line, 0}, 65535, 5, :done, 1000, [{:stream, 5, {:cowboy_telemetry_h, {:state, {:cowboy_stream_h, {:state, :undefined, AppWeb.Endpoint.HTTP, #PID<0.1093.0>, :undefined, :undefined, :undefined, :undefined, 0, :nofin, "", 0, ...}}, #Function<0.39451584/1 in :cowboy_telemetry_h.metrics_callback>, :undefined, %{body_length: 0, cert: :undefined, has_body: false, headers: %{"accept" => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7", "accept-encoding" => "gzip, deflate", "accept-language" => "en-US,en;q=0.9", "connection" => "keep-alive", "cookie" => "_app_key=SFMyNTY.g3QAAAABbQAAAAtfY3NyZl90b2tlbm0AAAAYZ3hoNWVWdFhOVFh6ZzFudGoydWkxV0dC.VRdSr3lkxk5STVLYbfaG5n9X9kZdDyN1DmT7896_5I4", "host" => "kraal-dev.bndge.com", "referer" => "http://kraal-dev.bndge.com/sims", ...}, host: "kraal-dev.bndge.com", method: "GET", path: "/download", peer: {{10, 26, ...}, 50238}, pid: #PID<0.1027.0>, port: 80, qs: "", ...}, "302 Found", %{"cache-control" => "max-age=0, private, must-revalidate", "content-length" => "150", "content-type" => "text/html; charset=utf-8", "date" => "Mon, 10 Jun 2024 17:59:38 GMT", "location" => "/sims/", "referrer-policy" => "strict-origin-when-cross-origin", "server" => "Cowboy", "x-content-type-options" => "nosniff", "x-download-options" => "noopen", ...}, AppWeb.Endpoint.HTTP, -576457459844398761, :undefined, :undefined, :undefined, -576457459731708161, -576457459731708161, %{#PID<0.1093.0> => %{...}}, [], ...}}, "GET", :"HTTP/1.1", :undefined, :undefined, 0, []}], [{:child, #PID<0.1093.0>, 5, 5000, :undefined}]}, 5, [{:response, "302 Found", %{"cache-control" => "max-age=0, private, must-revalidate", "content-length" => "150", "content-type" => "text/html; charset=utf-8", "date" => "Mon, 10 Jun 2024 17:59:38 GMT", "location" => "/sims/", "referrer-policy" => "strict-origin-when-cross-origin", "server" => "Cowboy", "x-content-type-options" => "nosniff", "x-download-options" => "noopen", "x-frame-options" => "SAMEORIGIN", "x-permitted-cross-domain-policies" => "none", "x-request-id" => "F9e2cRGhBIE2zqsAAARR"}, [["<html><body>You are being <a href=\"/sims/\">redirected</a>."], "<iframe hidden height=\"0\" width=\"0\" src=\"/phoenix/live_reload/frame\"></iframe>", "</body>" | "</html>"]}]], [file: '/home/wturner/sandbox/testbed/app/deps/cowboy/src/cowboy_http.erl', line: 957]}, {:cowboy_http, :loop, 1, [file: '/home/wturner/sandbox/testbed/app/deps/cowboy/src/cowboy_http.erl', line: 257]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}
Thank you, the code is below:
Code
Liveview named sims_live.ex
defmodule AppWeb.SimsLive do
use AppWeb, :live_view
def mount(_params, _session, socket) do
{:ok,
assign(socket,
nothing: ""
)}
end
def handle_event("get_JSON", params, socket) do
IO.inspect params
{:ok, conn} =
SSH.connect(
"system_ip.whatever",
user: "root",
identity: "/.ssh/id_rsa_nop",
save_accepted_host: false,
silently_accept_hosts: true,
user_interaction: false
)
file_path = "priv/data.json"
result = SSH.fetch(conn, "/data.json")
{:ok, json_data} = result
case File.write(file_path, json_data) do
:ok ->
# IO.puts("File written successfully")
{:noreply, redirect(socket, to: "/download")}
{:error, reason} ->
IO.puts("Failed to write to file: #{reason}")
{:noreply, socket}
end
end
def render(assigns) do
~H"""
<div>
<a phx-click="get_JSON"> Click me </a>
</div>
"""
end
end
Controller named download_controller
defmodule AppWeb.DownloadController do
use AppWeb, :controller
def home(conn, _params) do
path = Application.app_dir(:app, "priv/data.json") #static directory
send_download(conn, {:file, path})
render(conn, :home, layout: false)
end
end
