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api_openurl.php
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api_openurl.php
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<?php
/*
OpenURL resolver that uses BioStor as source database.
Uses CouchDB views for identifiers and [ISSN,volume,spage] triple, and also full text search
Note that it accepts unparsed citations if they are supplied using the "rft.dat" key, e.g.
http://bionames.org/api/openurl.php?rft.dat=Uchikawa%2C%20K.%20%281989%29%20Ten%20new%20taxa%20of%20chiropteran%20myobiids%20of%20the%20genus%20Pteracarus%20%28Acarina%3A%20Myobiidae%29.%20Bull.%20Br.%20Mus.%20nat.%20Hist.%20%28Zool.%29%2C%2055%3A%2097-108
*/
require_once (dirname(__FILE__) . '/couchsimple.php');
require_once (dirname(__FILE__) . '/nameparse.php');
require_once (dirname(__FILE__) . '/reference_code.php');
require_once (dirname(__FILE__) . '/find.php');
require_once (dirname(__FILE__) . '/api_utils.php');
$debug_openurl = true;
//--------------------------------------------------------------------------------------------------
// From http://snipplr.com/view/6314/roman-numerals/
// Expand subtractive notation in Roman numerals.
function roman_expand($roman)
{
$roman = str_replace("CM", "DCCCC", $roman);
$roman = str_replace("CD", "CCCC", $roman);
$roman = str_replace("XC", "LXXXX", $roman);
$roman = str_replace("XL", "XXXX", $roman);
$roman = str_replace("IX", "VIIII", $roman);
$roman = str_replace("IV", "IIII", $roman);
return $roman;
}
//--------------------------------------------------------------------------------------------------
// From http://snipplr.com/view/6314/roman-numerals/
// Convert Roman number into Arabic
function arabic($roman)
{
$result = 0;
$roman = strtoupper($roman);
// Remove subtractive notation.
$roman = roman_expand($roman);
// Calculate for each numeral.
$result += substr_count($roman, 'M') * 1000;
$result += substr_count($roman, 'D') * 500;
$result += substr_count($roman, 'C') * 100;
$result += substr_count($roman, 'L') * 50;
$result += substr_count($roman, 'X') * 10;
$result += substr_count($roman, 'V') * 5;
$result += substr_count($roman, 'I');
return $result;
}
//--------------------------------------------------------------------------------------------------
// Convert Arabic numerals into Roman numerals.
function roman($arabic)
{
$ones = Array("", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX");
$tens = Array("", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC");
$hundreds = Array("", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM");
$thousands = Array("", "M", "MM", "MMM", "MMMM");
if ($arabic > 4999)
{
// For large numbers (five thousand and above), a bar is placed above a base numeral to indicate multiplication by 1000.
// Since it is not possible to illustrate this in plain ASCII, this function will refuse to convert numbers above 4999.
die("Cannot represent numbers larger than 4999 in plain ASCII.");
}
elseif ($arabic == 0)
{
// About 725, Bede or one of his colleagues used the letter N, the initial of nullae,
// in a table of epacts, all written in Roman numerals, to indicate zero.
return "N";
}
else
{
// Handle fractions that will round up to 1.
if (round(fmod($arabic, 1) * 12) == 12)
{
$arabic = round($arabic);
}
// With special cases out of the way, we can proceed.
// NOTE: modulous operator (%) only supports integers, so fmod() had to be used instead to support floating point.
$roman = $thousands[($arabic - fmod($arabic, 1000)) / 1000];
$arabic = fmod($arabic, 1000);
$roman .= $hundreds[($arabic - fmod($arabic, 100)) / 100];
$arabic = fmod($arabic, 100);
$roman .= $tens[($arabic - fmod($arabic, 10)) / 10];
$arabic = fmod($arabic, 10);
$roman .= $ones[($arabic - fmod($arabic, 1)) / 1];
$arabic = fmod($arabic, 1);
return $roman;
}
}
//--------------------------------------------------------------------------------------------------
/**
* @brief Parse OpenURL parameters and return context object
*
* @param params Array of OpenURL parameters
* @param context_object Context object to populate
*
*/
function parse_openurl($params, &$context_object)
{
global $debug_openurl;
$context_object->referring_entity = new stdClass;
$context_object->referent = new stdClass;
$context_object->referent->type = 'unknown';
$context_object->redirect = true;
foreach ($params as $key => $value)
{
switch ($key)
{
case 'redirect':
switch ($value[0])
{
case 'true':
$context_object->redirect = true;
break;
case 'false':
default:
$context_object->redirect = false;
break;
}
break;
case 'ctx_ver':
$context_object->version = $value[0];
break;
case 'rfe_id':
$context_object->referring_entity->id = $value[0];
break;
case 'rft_val_fmt':
switch ($value)
{
case 'info:ofi/fmt:kev:mtx:journal':
$context_object->referent->type = 'article';
break;
case 'info:ofi/fmt:kev:mtx:book':
$context_object->referent->type = 'book';
break;
default:
if (!isset($context_object->referent->type))
{
$context_object->referent->type = 'Unknown';
}
break;
}
break;
// Article title
case 'rft.atitle':
case 'atitle':
$title = $value[0];
$title = preg_replace('/\.$/', '', $title);
$title = strip_tags($title);
$title = html_entity_decode($title, ENT_NOQUOTES, 'UTF-8');
$context_object->referent->title = $title;
$context_object->referent->type = 'article';
break;
// Book title
case 'rft.btitle':
case 'btitle':
$context_object->referent->title = $value[0];
$context_object->referent->type = 'book';
break;
// Journal title
case 'rft.jtitle':
case 'rft.title':
case 'title':
$publication_outlet = trim($value[0]);
$publication_outlet = preg_replace('/^\[\[/', '', $publication_outlet);
$publication_outlet = preg_replace('/\]\]$/', '', $publication_outlet);
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->name = $publication_outlet;
$context_object->referent->type = 'article';
break;
// ISSN
case 'rft.issn':
case 'issn':
$identifier = new stdclass;
$identifier->type = 'issn';
$identifier->id = trim($value[0]);
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->identifier[] = $identifier;
break;
// Identifiers
case 'rft_id':
case 'id':
foreach ($value as $v)
{
// DOI
if (preg_match('/^(info:doi\/|doi:)(?<doi>.*)/', $v, $match))
{
$identifier = new stdclass;
$identifier->type = 'doi';
$identifier->id = $match['doi'];
$context_object->referent->identifier[] = $identifier;
}
// Handle
if (preg_match('/^(info:hdl\/|hdl:)(?<hdl>.*)/', $v, $match))
{
$identifier = new stdclass;
$identifier->type = 'handle';
$identifier->id = $match['hdl'];
$context_object->referent->identifier[] = $identifier;
}
// PMID
if (preg_match('/^(info:pmid\/|pmid:)(?<pmid>.*)/', $v, $match))
{
$identifier = new stdclass;
$identifier->type = 'pmid';
$identifier->id = $match['pmid'];
$context_object->referent->identifier[] = $identifier;
}
// PMC
if (preg_match('/^(pmc:)(?<pmc>.*)/', $v, $match))
{
$identifier = new stdclass;
$identifier->type = 'pmc';
$identifier->id = $match['pmc'];
$context_object->referent->identifier[] = $identifier;
}
// Without INFO-URI prefix
// LSID
if (preg_match('/^urn:lsid:/', $v))
{
$identifier = new stdclass;
$identifier->type = 'lsid';
$identifier->id = $v;
$context_object->referent->identifier[] = $identifier;
}
// URL (including PDFs)
if (preg_match('/^http:\/\//', $v))
{
$matched = false;
// PDF
if (!$matched)
{
if (preg_match('/\.pdf/', $v))
{
$matched = true;
$context_object->referent->pdf = $v;
}
}
// BioStor
if (!$matched)
{
if (preg_match('/http:\/\/biostor.org\/reference\/(?<id>\d+)$/', $v, $match))
{
$matched = true;
$identifier = new stdclass;
$identifier->type = 'biostor';
$identifier->id = $match['id'];
$context_object->referent->identifier[] = $identifier;
}
}
if (!$matched)
{
$context_object->referent->link = new stdclass;
$context_object->referent->link->url = $v;
}
}
}
break;
// Authors
case 'rft.au':
case 'au':
foreach ($value as $v)
{
$parts = parse_name($v);
$author = new stdClass();
if (isset($parts['last']))
{
$author->lastname = $parts['last'];
}
if (isset($parts['suffix']))
{
$author->suffix = $parts['suffix'];
}
if (isset($parts['first']))
{
$author->forename = $parts['first'];
if (array_key_exists('middle', $parts))
{
$author->forename .= ' ' . $parts['middle'];
}
}
$context_object->referent->author[] = $author;
}
break;
// article details
case 'rft.volume':
case 'volume':
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->volume = $value[0];
break;
case 'rft.issue':
case 'issue':
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->issue = $value[0];
break;
case 'rft.spage':
case 'spage':
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->pages = $value[0];
break;
case 'rft.epage':
case 'epage':
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
if (isset($context_object->referent->journal->pages))
{
$context_object->referent->journal->pages .= '--' . $value[0];
}
else
{
$context_object->referent->journal->pages = $value[0];
}
break;
case 'rft.pages':
case 'pages':
if (!isset($context_object->referent->journal))
{
$context_object->referent->journal = new stdclass;
}
$context_object->referent->journal->pages = $value[0];
$context_object->referent->journal->pages = preg_replace('/–/u', '--', $context_object->referent->journal->pages);
break;
default:
$k = str_replace("rft.", '', $key);
$context_object->referent->$k = $value[0];
break;
}
}
// Clean
//print_r($context_object);
// Dates
if (isset($context_object->referent->date))
{
if (preg_match('/^[0-9]{4}$/', $context_object->referent->date))
{
$context_object->referent->year = $context_object->referent->date;
$context_object->referent->date = $context_object->referent->date . '-00-00';
}
if (preg_match('/^(?<year>[0-9]{4})-(?<month>[0-9]{2})-(?<day>[0-9]{2})$/', $context_object->referent->date, $match))
{
$context_object->referent->year = $match['year'];
$context_object->referent->date = $match['year'] . '-' . $match['month'] . '-' . $match['day'];
}
}
// Zotero
/*
// Endnote epage may have leading "-" as it splits spage-epage to generate OpenURL
// would need to fix mode, as here we don't have epage
if (isset($context_object->referent->epage))
{
$context_object->referent->epage = preg_replace('/^\-/', '', $context_object->referent->epage);
}
*/
if (isset($context_object->referent->journal))
{
// Journal titles with series numbers are split into title,series fields
if (preg_match('/(?<title>.*),?\s+series\s+(?<series>[0-9]+)$/i', $context_object->referent->journal->name, $match))
{
$context_object->referent->journal->name= $match['title'];
$context_object->referent->journal->series= $match['series'];
}
// Volume might have series information
if (isset($context_object->referent->journal->volume))
{
if (preg_match('/^series\s+(?<series>[0-9]+),\s*(?<volume>[0-9]+)$/i', $context_object->referent->journal->volume, $match))
{
$context_object->referent->journal->volume= $match['volume'];
$context_object->referent->journal->series= $match['series'];
}
}
}
// Author array might not be populated, in which case add author from aulast and aufirst fields
if (isset($context_object->referent->author))
{
if ((count($context_object->referent->author) == 0) && (isset($context_object->referent->aulast) && isset($context_object->referent->aufirst)))
{
$author = new stdClass();
$author->surname = $context_object->referent->aulast;
$author->forename = $context_object->referent->aufirst;
$context_object->referent->author[] = $author;
}
}
// Use aulast and aufirst to ensure first author name properly parsed
if (isset($context_object->referent->aulast) && isset($context_object->referent->aufirst))
{
$author = new stdClass();
$author->surname = $context_object->referent->aulast;
$author->forename = $context_object->referent->aufirst;
$context_object->referent->author[0] = $author;
}
// EndNote encodes accented characters, which break journal names
if (isset($context_object->referent->publication_outlet))
{
$context_object->referent->publication_outlet = preg_replace('/%9F/', 'ü', $context_object->referent->publication_outlet);
}
}
//--------------------------------------------------------------------------------------------------
/**
* @brief Handle OpenURL request
*
* We may have more than one parameter with same name, so need to access QUERY_STRING, not _GET
* http://stackoverflow.com/questions/353379/how-to-get-multiple-parameters-with-same-name-from-a-url-in-php
*
*/
function main()
{
global $config;
global $couch;
$debug_openurl = false;
$webhook = '';
$callback = '';
// If no query parameters
if (count($_GET) == 0)
{
//display_form();
exit(0);
}
if (isset($_GET['webhook']))
{
$webhook = $_GET['webhook'];
}
if (isset($_GET['debug']))
{
$debug_openurl = true;
}
if (isset($_GET['callback']))
{
$callback = $_GET['callback'];
}
// Handle query and display results.
$query = explode('&', html_entity_decode($_SERVER['QUERY_STRING']));
$params = array();
foreach( $query as $param )
{
list($key, $value) = explode('=', $param);
$key = preg_replace('/^\?/', '', urldecode($key));
$params[$key][] = trim(urldecode($value));
}
// This is what we got from user
$context_object = new stdclass;
parse_openurl($params, $context_object);
//print_r($context_object);
// OK, can we find this?
// result object
$openurl_result = new stdclass;
$openurl_result->status = 404;
$openurl_result->context_object = $context_object;
$openurl_result->results = array();
if ($debug_openurl)
{
$openurl_result->debug = new stdclass;
}
// via DOI or other identifier
if (count($openurl_result->results) == 0)
{
// identifier search
if (isset($context_object->referent->identifier))
{
//print_r($context_object->referent->identifier);
$found = false;
foreach ($context_object->referent->identifier as $identifier)
{
if ($debug_openurl)
{
$openurl_result->debug->identifiers[] = $identifier;
}
if (!$found)
{
switch ($identifier->type)
{
case 'doi':
$url = $config['couchdb_options']['database'] . "/_design/identifier/_view/doi?key=" . urlencode('"' . $identifier->id . '"');
//echo $url . '<br />';
if ($config['stale'])
{
$url .= '&stale=ok';
}
$resp = $couch->send("GET", "/" . $url . '&limit=1' );
$result = json_decode($resp);
if (isset($result->rows))
{
if (count($result->rows) == 1)
{
if ($debug_openurl)
{
$openurl_result->debug->found_from_identifiers = true;
}
$found = true;
$match = new stdclass;
$match->match = true;
$match->id = $result->rows[0]->id;
$match->{$identifier->type} = $identifier->id;
$openurl_result->results[] = $match;
$openurl_result->status = 200;
}
}
break;
case 'pmid':
$url = $config['couchdb_options']['database'] . "/_design/identifier/_view/pmid?key=" . $identifier->id;
//echo $url . '<br />';
if ($config['stale'])
{
$url .= '&stale=ok';
}
$resp = $couch->send("GET", "/" . $url . '&limit=1' );
$result = json_decode($resp);
if (count($result->rows) == 1)
{
$openurl_result->debug->found_from_identifiers = true;
$found = true;
$match = new stdclass;
$match->match = true;
$match->id = $result->rows[0]->id;
$match->{$identifier->type} = $identifier->id;
$openurl_result->results[] = $match;
$openurl_result->status = 200;
}
break;
default:
break;
}
}
}
}
}
// classical OpenURL lookup using [ISSN,volume,spage] triple
if (count($openurl_result->results) == 0)
{
$triple = false;
if (isset($context_object->referent->journal->name))
{
$journal = $context_object->referent->journal->name;
// Convert accented characters
$journal = strtr(utf8_decode($journal),
utf8_decode("ÀÁÂÃÄÅàáâãäåĀāĂ㥹ÇçĆćĈĉĊċČčÐðĎďĐđÈÉÊËèéêëĒēĔĕĖėĘęĚěĜĝĞğĠġĢģĤĥĦħÌÍÎÏìíîïĨĩĪīĬĭĮįİıĴĵĶķĸĹĺĻļĽľĿŀŁłÑñŃńŅņŇňʼnŊŋÒÓÔÕÖØòóôõöøŌōŎŏŐőŔŕŖŗŘřŚśŜŝŞşŠšſŢţŤťŦŧÙÚÛÜùúûüŨũŪūŬŭŮůŰűŲųŴŵÝýÿŶŷŸŹźŻżŽž"),
"aaaaaaaaaaaaaaaaaaccccccccccddddddeeeeeeeeeeeeeeeeeegggggggghhhhiiiiiiiiiiiiiiiiiijjkkkllllllllllnnnnnnnnnnnoooooooooooooooooorrrrrrsssssssssttttttuuuuuuuuuuuuuuuuuuuuwwyyyyyyzzzzzz");
$journal = utf8_encode($journal);
$journal = strtolower($journal);
$journal = preg_replace('/\bfor\b/', '', $journal);
$journal = preg_replace('/\band\b/', '', $journal);
$journal = preg_replace('/\bof\b/', '', $journal);
$journal = preg_replace('/\bthe\b/', '', $journal);
$journal = preg_replace('/\bde\b/', '', $journal);
$journal = preg_replace('/\bla\b/', '', $journal);
$journal = preg_replace('/\bet\b/', '', $journal);
// whitespace
$journal = preg_replace('/\s+/', '', $journal);
// punctuation
$journal = preg_replace('/[\.|,|\'|\(|\)]+/', '', $journal);
if (isset($context_object->referent->journal->volume))
{
$volume = $context_object->referent->journal->volume;
if (isset($context_object->referent->journal->pages))
{
if (is_numeric($context_object->referent->journal->pages))
{
$spage = $context_object->referent->journal->pages;
$triple = true;
}
else
{
if (preg_match('/^(?<spage>\d+)--(?<epage>\d+)$/', $context_object->referent->journal->pages, $m))
{
$spage = $m['spage'];
$triple = true;
}
}
}
}
if ($triple)
{
if ($debug_openurl)
{
$openurl_result->debug->triple = $triple;
$openurl_result->debug->journal = $journal;
}
$openurl_result->status = 200;
// i. get ISSN
$url = $config['couchdb_options']['database'] . "/_design/openurl/_view/journal_to_issn?key=" . urlencode('"' . $journal . '"');
//echo $url;
if ($config['stale'])
{
$url .= '&stale=ok';
}
//echo $url;
$resp = $couch->send("GET", "/" . $url . '&limit=1' );
$result = json_decode($resp);
//print_r($resp);
if (count($result->rows) == 1)
{
// we have an ISSN for this journal
$issn = $result->rows[0]->value;
if ($debug_openurl)
{
$openurl_result->debug->issn = $issn;
}
// build triple [ISSN, volume, spage]
$keys = array(
$issn,
$volume,
$spage
);
if ($debug_openurl)
{
$openurl_result->debug->keys = $keys;
}
$url = $config['couchdb_options']['database'] . "/_design/openurl/_view/issn_triple?key=" . urlencode(json_encode($keys));
//echo $url . '<br />';
if ($config['stale'])
{
$url .= '&stale=ok';
}
$resp = $couch->send("GET", "/" . $url );
$r = json_decode($resp);
//print_r($r);
if (count($r->rows) > 0)
{
foreach ($r->rows as $row)
{
$match = new stdclass;
$match->match = true;
$match->triple = $keys;
$match->id = $row->id;
$openurl_result->results[] = $match;
}
}
else
{
// No hit, try converting volume to/from Roman
if (is_numeric($volume))
{
$volume = strtolower (roman($volume));
}
else
{
$volume = arabic($volume);
}
$keys = array(
$issn,
$volume,
$spage
);
if ($debug_openurl)
{
$openurl_result->debug->keys = $keys;
}
$url = $config['couchdb_options']['database'] . "/_design/openurl/_view/triple?key=" . urlencode(json_encode($keys));
//echo $url . '<br />';
if ($config['stale'])
{
$url .= '&stale=ok';
}
$resp = $couch->send("GET", "/" . $url );
$r = json_decode($resp);
//print_r($r);
if (count($r->rows) > 0)
{
foreach ($r->rows as $row)
{
$match = new stdclass;
$match->match = true;
$match->triple = $keys;
$match->id = $row->id;
$openurl_result->results[] = $match;
}
}
}
}
}
}
}
// full text search
if (count($openurl_result->results) == 0)
{
// Has user supplied an unparsed string?
if (isset($context_object->referent->dat))
{
find_citation($context_object->referent->dat, $openurl_result, 0.7);
}
}
// ok, if we have one or more results we return these and let user/agent decide what to do
$num_results = count($openurl_result->results);
if ($context_object->redirect)
{
$id = 0;
if ($num_results == 1)
{
if ($openurl_result->results[0]->match)
{
// I'm feeling lucky
$id = $openurl_result->results[0]->id;
}
}
// Redirect to reference display, if not found then id is 0 and so we get default error message
header('Location: reference/' . $id . "\n\n");
}
else
{
// API call return, populated with details
for ($i = 0; $i < $num_results; $i++)
{
$resp = $couch->send("GET", "/" . $config['couchdb_options']['database'] . "/" . urlencode($openurl_result->results[$i]->id));
$reference = json_decode($resp);
if (!isset($reference->error))
{
$openurl_result->results[$i]->reference = $reference;
// unset large fields
if (isset($openurl_result->results[$i]->reference->text))
{
unset($openurl_result->results[$i]->reference->text);
}
if (isset($openurl_result->results[$i]->reference->names))
{
unset($openurl_result->results[$i]->reference->names);
}
}
}
api_output($openurl_result, $callback);
}
}
main();
?>