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<?vsp
declare debug, def_qry, ini_dflt_graph, can_sponge any;
declare consumer_key, consumer_secret, oauth_token, oauth_secret, signature, timest, nonce varchar;
declare srv, res, signature_base, ret_url, url, tmp, sid, bin varchar;
declare meth, pars, hdr, content_type, host any;
declare cookie_str, cookie_vec any;
debug := get_keyword ('debug', params, case (get_keyword ('query', params, '')) when '' then '1' else '' end);
def_qry := cfg_item_value (virtuoso_ini_path (), 'SPARQL', 'DefaultQuery');
if (def_qry is null)
def_qry := 'SELECT * WHERE {?s ?p ?o}';
ini_dflt_graph := cfg_item_value (virtuoso_ini_path (), 'SPARQL', 'DefaultGraph');
connection_set ('client_ip', client_attr ('client_ip'));
consumer_key := {?'key'};
host := http_request_header (lines, 'Host', null, 'localhost:'||server_http_port ());
srv := sprintf ('http://%s/OAuth/', host);
sid := null;
res := '';
hdr := '';
content_type := '';
sid := {?'sid'};
cookie_str := http_request_header (lines, 'Cookie', null, null);
cookie_vec := split_and_decode (cookie_str, 0, '\0\0;=');
for (declare i, l int, i := 0, l := length (cookie_vec); i < l; i := i + 1)
{
cookie_vec [i] := trim (cookie_vec [i]);
}
if (sid is null and isarray (cookie_vec))
{
sid := get_keyword ('oauth.sid', cookie_vec, null);
if (consumer_key is null or consumer_key = '')
consumer_key := OAUTH..get_consumer_key (sid);
}
if ({?'es'} is not null and length (sid))
{
OAUTH..session_terminate (sid);
sid := null;
http_status_set (302);
http_header (sprintf ('Location: sparql.vsp\r\nSet-Cookie: oauth.sid=; expires=%s; path=/\r\n', date_rfc1123 (dateadd ('hour', 1, now()))));
return;
}
if (sid = '')
sid := null;
else
{
if (consumer_key <> OAUTH..get_consumer_key (sid))
{
OAUTH..session_terminate (sid);
sid := null;
}
}
meth := 'http://'||host||'/oauth/sparql.vsp';
if ({?'oauth_signature'} is not null)
{
declare uid, rc varchar;
uid := null;
rc := OAUTH..check_authentication_by_name_safe (params, lines, uid, 'SPARQL');
set_user_id ('SPARQL');
connection_set ('SPARQLUserId', uid);
if (rc and uid is not null)
return WS.WS."/!sparql/" (path, params, lines);
http_status_set (301);
http_header (sprintf ('Location: oauth_error.vspx?err=%U\r\n', 'Can not verify signature'));
return;
--signal ('42000', 'Can not verify OAuth signature');
}
else if ({?'rt'} is not null and sid is null) -- ask for token
{
over:
declare exit handler for sqlstate '*' {
http_status_set (301);
http_header (sprintf ('Location: oauth_error.vspx?err=%U\r\n', 'Invalid token supplied'));
return;
};
url := srv||'request_token';
url := OAUTH..sign_request ('GET', url, 'oauth_client_ip='||http_client_ip (), consumer_key, sid);
res := http_get (url);
sid := OAUTH..parse_response (sid, consumer_key, res);
OAUTH..set_session_data (sid, params);
ret_url := sprintf ('http://%s/oauth/sparql.vsp?ready=%U', host, sid);
url := sprintf ('%sauthorize?oauth_token=%U&oauth_callback=%U', srv, OAUTH..get_auth_token (sid), ret_url);
http_status_set (302);
http_header (sprintf ('Location: %s\r\nSet-Cookie: oauth.sid=; expires=%s; path=/\r\n',
url,
date_rfc1123 (dateadd ('hour', 1, now()))
));
return;
}
else if ({?'ready'} is not null) -- get access token
{
declare exit handler for sqlstate '*' {
http_status_set (301);
http_header (sprintf ('Location: oauth_error.vspx?err=%U\r\n', 'Invalid token supplied'));
return;
};
sid := {?'ready'};
url := srv||'access_token';
consumer_key := OAUTH..get_consumer_key (sid);
url := OAUTH..sign_request ('GET', url, 'oauth_client_ip='||http_client_ip (), consumer_key, sid);
res := http_get (url);
sid := OAUTH..parse_response (sid, consumer_key, res);
}
if (sid is not null) -- access token is ready
{
declare saved_pars, expire, cook_str varchar;
-- here we are ready to call service
tmp := null;
saved_pars := params;
if ({?'rt'} is null)
{
tmp := OAUTH..get_session_data (sid);
}
else
tmp := params;
if (tmp is null)
goto skip;
url := meth;
params := '';
for (declare i,l int, l:=length (tmp); i < l; i := i + 2)
{
if (tmp[i] not in ('Content', 'ready', 'sid', 'rt', 'key', 'realm'))
params := params || sprintf ('%U=%U&', tmp[i], tmp[i+1]);
}
consumer_key := OAUTH..get_consumer_key (sid);
declare exit handler for sqlstate '*' {
params := saved_pars;
consumer_key := get_keyword ('key', params);
sid := null;
goto over;
};
url := OAUTH..sign_request ('GET', url, params, consumer_key, sid);
http_status_set (302);
http_header ('Location: '||url||'\r\n');
expire := sprintf (' expires=%s;', date_rfc1123 (dateadd ('hour', 1, now())));
cook_str := sprintf ('Set-Cookie: oauth.sid=%s;%s path=/\r\n', sid, expire);
if (strstr (http_header_get (), 'Set-Cookie: sid=') is null)
{
cook_str := concat (http_header_get (), cook_str);
http_header (cook_str);
}
OAUTH..set_session_data (sid, null);
return;
}
skip:
?><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Virtuoso SPARQL Query Form</title>
<style type="text/css">
label
{ display: inline; margin-top: 10pt; }
body { font-family: arial, helvetica, sans-serif; font-size: 9pt; color: #234; }
fieldset { border: 2px solid #86b9d9; }
legend { font-size: 12pt; color: #86b9d9; }
label { font-weight: bold; }
h1 { width: 100%; background-color: #86b9d9; font-size: 18pt; font-weight: normal; color: #fff; height: 4ex; text-align: right; vertical-align: middle; padding-right: 8px; }
</style>
<script language="JavaScript">
var last_format = 1;
function format_select(query_obg)
{
var query = query_obg.value;
var format = query_obg.form.format;
if (query.match(/construct/i) && last_format == 1) {
for(var i = format.options.length; i > 0; i--)
format.options[i] = null;
format.options[1] = new Option('N3/Turtle','text/rdf+n3');
format.options[2] = new Option('RDF/XML','application/rdf+xml');
format.selectedIndex = 1;
last_format = 2;
}
if (!query.match(/construct/i) && last_format == 2) {
for(var i = format.options.length; i > 0; i--)
format.options[i] = null;
format.options[1] = new Option('HTML','text/html');
format.options[2] = new Option('XML','application/sparql-results+xml');
format.options[3] = new Option('JSON','application/sparql-results+json');
format.options[4] = new Option('Javascript','application/javascript');
format.selectedIndex = 1;
last_format = 1;
}
}
</script>
</head>
<body>
<div id="header">
<h1>OpenLink Virtuoso SPARQL Query</h1>
</div>
<div id="main">
<p>This query page is designed to help you test OpenLink Virtuoso SPARQL protocol endpoint. <br/>
Consult the <a href="http://virtuoso.openlinksw.com/wiki/main/Main/VOSSparqlProtocol">Virtuoso Wiki page</a> describing the service
or the <a href="http://docs.openlinksw.com/virtuoso/">Online Virtuoso Documentation</a> section <a href="http://docs.openlinksw.com/virtuoso/rdfandsparql.html">RDF Database and SPARQL</a>.</p>
<p>There is also a rich Web based user interface with sample queries.
<?vsp if (DB.DBA.VAD_CHECK_VERSION('iSPARQL') is null) { ?>
In order to use it you must install the iSPARQL package (isparql_dav.vad).</p>
<?vsp } else { ?>
You can access it at: <a href="/isparql">/isparql</a>.</p>
<?vsp } ?>
<form action="" method="GET">
<fieldset>
<legend>Query</legend>
<label for="default-graph-uri">Default Graph URI</label>
<br />
<input type="text" name="default-graph-uri" id="default-graph-uri" value="<?V ini_dflt_graph ?>" size="80"/>
<br /><br />
<?vsp if (can_sponge)
{
declare s_param varchar;
s_param := get_keyword ('should-sponge', params, '');
?>
<select name="should-sponge" id="should-sponge">');
<option <?V case (s_param) when '' then ' selected="selected"' else '' end ?> value="">Use only local data (including data retrieved before), but do not retrieve more</option>
<option <?V case (s_param) when 'soft' then ' selected="selected"' else '' end ?> value="soft">Retrieve remote RDF data for all missing source graphs</option>
<option <?V case (s_param) when 'grab-all' then ' selected="selected"' else '' end ?> value="grab-all">Retrieve all missing remote RDF data that might be useful</option>
<option <?V case (s_param) when 'grab-seealso' then ' selected="selected"' else '' end ?> value="grab-all-seealso">Retrieve all missing remote RDF data that might be useful, including seeAlso references</option>
<option <?V case (s_param) when 'grab-everything' then ' selected="selected"' else '' end ?> value="grab-everything">Try to download all referenced resources (this may be very slow and ineffecient)</option>
</select>
<br />
<?vsp }
else
{
declare host_ur varchar;
host_ur := registry_get ('URIQADefaultHost');
?>
<i>Security restrictions of this server do not allow you to retrieve remote RDF data.
DBA may wish to grant "SPARQL_SPONGE" privilege to "SPARQL" account to remove the restriction.
In order to do this, please perform the following steps:</i>
<br />
1. Go to the Virtuoso Administration Conductor i.e.
<?vsp
if (not isstring (host_ur))
{
htt ('http://host:port/conductor');
}
else
{
http(sprintf('http://%s/conductor',host_ur));
};
?>
<br />
2. Login as dba user
<br />
3. Go to System Admin->User Accounts->Roles
<br />
4. Click the link "Edit" for "SPARQL_SPONGE"
<br />
5. Select from the list of available user/groups "SPARQL" and click the ">>" button so to add it to the right-positioned list.
<br />
6. Click the button "Update"
<br />
7. Access again the sparql endpoint in order to be able to retrieve remote data.
<br /><br />
<?vsp } ?>
<label for="query">Query text</label>
<br />
<textarea rows="10" cols="60" name="query" id="query" onchange="format_select(this)"
onkeyup="format_select(this)"><?V coalesce (def_qry, '') ?></textarea>
<br />
<label for="query">OAuth token</label>
<br />
<input type="text" name="key" size="50" value="<?V coalesce (consumer_key, '') ?>" />
<br /><br />
<label for="format" class="n">Display Results As:</label>
<select name="format">
<option value="auto">Auto</option>
<option value="text/html" selected="selected">HTML</option>
<option value="application/vnd.ms-excel">Spreadsheet</option>
<option value="application/sparql-results+xml">XML</option>
<option value="application/sparql-results+json">JSON</option>
<option value="application/javascript">Javascript</option>
</select>
<input name="debug" type="checkbox" <?V case (debug) when '' then '' else ' checked' end ?>/>
<label for="debug" class="n">Rigorous check of the query</label>
<input type="submit" value="Run Query" name="rt"/>
<input type="submit" value="End session" name="es"/>
<input type="reset" value="Reset"/>
</fieldset>
</form>
</div>
</body>
</html>
|
