Persist SteamKit auth sessions

scripts/steamkit_auth.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+set -eu
+
+SCRIPT_DIR="$(CDPATH= cd -- "$(dirname "$0")" && pwd)"
+REPO_DIR="$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd)"
+PROJECT_DIR="$REPO_DIR/tools/steamkit-pics"
+ENV_FILE="${STEAMKIT_ENV_FILE:-$REPO_DIR/.local/steamkit-env.sh}"
+SESSION_FILE="${STEAMKIT_SESSION_FILE:-$REPO_DIR/.local/steamkit-session.json}"
+
+if [ -f "$ENV_FILE" ]; then
+  # shellcheck disable=SC1090
+  . "$ENV_FILE"
+fi
+
+if [ -z "${STEAMKIT_USERNAME:-}" ] || [ -z "${STEAMKIT_PASSWORD:-}" ]; then
+  echo "STEAMKIT_USERNAME and STEAMKIT_PASSWORD are required in $ENV_FILE or the environment" >&2
+  exit 1
+fi
+
+export STEAMKIT_USERNAME STEAMKIT_PASSWORD
+if [ -n "${STEAMKIT_AUTH_CODE:-}" ]; then
+  export STEAMKIT_AUTH_CODE
+fi
+if [ -n "${STEAMKIT_TWO_FACTOR_CODE:-}" ]; then
+  export STEAMKIT_TWO_FACTOR_CODE
+fi
+if [ -n "${STEAMKIT_ACCEPT_MOBILE_CONFIRMATION:-}" ]; then
+  export STEAMKIT_ACCEPT_MOBILE_CONFIRMATION
+fi
+if [ -n "${STEAMKIT_TIMEOUT_SECONDS:-}" ]; then
+  export STEAMKIT_TIMEOUT_SECONDS
+fi
+
+mkdir -p "$(dirname "$SESSION_FILE")"
+
+dotnet run --project "$PROJECT_DIR" -- --auth-session-out "$SESSION_FILE" --session-file "$SESSION_FILE"
+chmod 600 "$SESSION_FILE"
+printf '%s\n' "Saved SteamKit session to $SESSION_FILE"