Directadmin upload logo using CMD_SKINS with error cannot get mime-type - directadmin

Question

I'm trying to upload a custom logo using CMD_API_SKINS
Here is my full code using curl + bash:
#/bin/bash
# DA needs this path
mkdir -p /home/tmp
# Assume my logo file is already here:
default_logo_file_home="/home/tmp/logo.png"
# The logo file is set to nobody:nogroup
chown nobody:nogroup "${default_logo_file_home}"
## Setup query data for curl:
username="admin"
password="12321aa"
da_port="2222"
host_server="server.domain.com"
ssl="https"
skin_name="evolution"
command="CMD_API_SKINS"
data="action=upload_logo&file=${default_logo_file_home}&json=yes&name=${skin_name}&which=1"
method="POST"
curl --silent --request "${method}" --user "${username}":"${password}" --data "${data}" "${ssl}://${host_server}:${da_port}/${command}"
When debugging this API, I got an error like this:
text='An Error Occurred'
result='Cannot get mime-type for log<br>
It seems like DA is trying to parse and obtain the extension name for the file "logo.png" but it couldn't
Full error logs:
DirectAdmin 1.61.5
Accepting Connections on port 2222
Sockets::handshake - begin
Sockets::handshake - end
/CMD_API_SKINS
0: Accept: */*
1: Authorization: Basic bWF4aW93bng3OnhGVEVHe***jUSg/UTRTfVdHYW0+fWNURn5ATWN***HFbZGpMezlQZ***=
2: Content-Length: 75
3: Content-Type: application/x-www-form-urlencoded
4: Host: server.domain.com:2222
5: User-Agent: curl/7.75.0
Post string: action=upload_logo&file=/home/tmp/logo2.png&json=yes&name=evolution&which=2
auth.authenticated
User::deny_override:/CMD_API_SKINS: call_level=2, depth1: aborting due to do depth
User::deny_override:/CMD_DOMAIN: call_level=2, depth1: aborting due to do depth
User::deny_override:/CMD_DOMAIN: call_level=1, depth2: aborting due to do depth
Plugin::addHooks: start
Plugin::addHooks: end
Command::doCommand(/CMD_API_SKINS)
cannot get mime type for log
Dynamic(api=1, error=1):
text='An Error Occurred'
result='Cannot get mime-type for log<br>
'
Command::doCommand(/CMD_API_SKINS) : finished
Command::run: finished /CMD_API_SKINS
I also try to encode the query like this but still got the same error
default_logo_file_home="%2Fhome%2Ftmp%2Flogo%2Epng"
data="action=upload%5Flogo&file=${default_logo_file_home}&json=yes&name=${skin_name}&which=%31"
Is there any explanations what is going on here? Is it possible to upload a logo using this API ?

Answer 1

Ok, I found the trick which is not documented anywhere. The uploaded file need to have a random string append to it. So I changed this:
default_logo_file_home="/home/tmp/logo.png"
into this:
RANDOM_STR="EbYIES"
default_logo_file_home="/home/tmp/logo.png${RANDOM_STR}"
Now it's working perfectly