create matrix account with API

create_matrix_account.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+if [ $# -lt 5 ]; then
+  echo "Usage: $0 <username> <password> <admin:true|false> <matrix server domain> <shared_secret> [displayname]"
+  exit 1
+fi
+
+username="$1"
+password="$2"
+is_admin="$3"
+domain="$4"
+shared_secret="$5"
+displayname="${6:-$username}"
+
+if [ "$is_admin" == "true" ]; then
+  admin_flag="admin"
+  admin_bool=true
+else
+  admin_flag="notadmin"
+  admin_bool=false
+fi
+
+# nonce
+nonce=$(curl -s -X GET "https://$domain/_synapse/admin/v1/register" | jq -r '.nonce')
+
+if [ -z "$nonce" ] || [ "$nonce" == "null" ]; then
+  echo "Failed to get nonce from server."
+  exit 1
+fi
+
+# HMAC digest (hex) using null byte separators
+mac=$(printf '%s\0%s\0%s\0%s' "$nonce" "$username" "$password" "$admin_flag" | \
+  openssl dgst -sha1 -hmac "$shared_secret" | awk '{print $2}')
+
+# registration request
+response=$(curl -s -X POST "https://$domain/_synapse/admin/v1/register" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "nonce": "'"$nonce"'",
+    "username": "'"$username"'",
+    "displayname": "'"$displayname"'",
+    "password": "'"$password"'",
+    "admin": '"$admin_bool"',
+    "mac": "'"$mac"'"
+  }')
+
+# response
+if echo "$response" | jq -e '.access_token' >/dev/null; then
+  echo "User @$username:$domain created successfully."
+  echo "$response" | jq
+else
+  echo "Failed to create user. Server response:"
+  echo "$response"
+  exit 1
+fi