Add a simple script for re-generating preview images

Submits jobs to regenerate previews of all attachments of a
collective.

tools/preview/regenerate-previews.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+# This script submits a job to regenerate all preview images. This may
+# be necessary if you change the dpi setting that affects the size of
+# the preview.
+
+set -e
+
+BASE_URL="${1:-http://localhost:7880}"
+LOGIN_URL="$BASE_URL/api/v1/open/auth/login"
+TRIGGER_URL="$BASE_URL/api/v1/sec/collective/previews"
+
+echo "Login to trigger regenerating preview images."
+echo "Using url: $BASE_URL"
+echo -n "Account: "
+read USER
+echo -n "Password: "
+read -s PASS
+echo
+
+auth=$(curl --fail -XPOST --silent --data-binary "{\"account\":\"$USER\", \"password\":\"$PASS\"}" "$LOGIN_URL")
+
+if [ "$(echo $auth | jq .success)" == "true" ]; then
+    echo "Login successful"
+    auth_token=$(echo $auth | jq -r .token)
+    curl --fail -XPOST -H "X-Docspell-Auth: $auth_token" "$TRIGGER_URL"
+else
+    echo "Login failed."
+fi