function merge_pdf_metadata($pdf_ids, $path)
{
if (count($pdf_ids) < 2) {
err_bad_input_format("expected at least 2 pdf ids");
}
// validate pdf arguments and gather merged pdf attributes
$attributes = array();
$tags = array();
$total_pages = 0;
foreach ($pdf_ids as $pdf_id) {
$pdf = get_pdf_info($pdf_id);
if (!$pdf) {
err_bad_input_data('pdfid', $pdf_id, 'not a valid pdf id');
}
if (!isset($attributes['title']) && $pdf['title']) {
$attributes['title'] = $pdf['title'];
}
if (!isset($attributes['date']) && $pdf['date']) {
$attributes['date'] = $pdf['date'];
}
if (!isset($attributes['origin']) && $pdf['origin']) {
$attributes['origin'] = $pdf['origin'];
}
if (!isset($attributes['recipient']) && $pdf['recipient']) {
$attributes['recipient'] = $pdf['recipient'];
}
$tags = array_unique(array_merge($tags, find_tags_for_pdf($pdf_id)));
}
foreach ($pdf_ids as $pdf_id) {
delete_pdf_metadata($pdf_id);
}
$new_id = add_pdf_to_db($path, $attributes);
foreach ($tags as $tag) {
tag_pdf($new_id, $tag);
}
if (!$new_id) {
err_internal("could not insert merged file to db");
}
return $new_id;
}
function service_associate_tags($args)
{
if (count($args) != 2) {
err_bad_input_format("expected two argument in URL (dash-separated list of tag ids followed by dash-separated list of pdf ids)");
}
$tags = explode('-', $args[0]);
$pdfs = explode('-', $args[1]);
foreach ($tags as $tag) {
if (!get_tag_info($tag)) {
err_bad_input_data('tagid', $tag, 'not a valid tag id');
}
}
foreach ($pdfs as $pdf) {
if (!get_pdf_info($pdf)) {
err_bad_input_data('pdfid', $pdf, 'not a valid pdf id');
}
}
foreach ($pdfs as $pdf_id) {
foreach ($tags as $tag) {
tag_pdf($pdf_id, $tag);
}
}
}