Implement URI construction handling append='qxri' xrd:URI attribute.

This is the right thing to do and may come in handy assisting OPs in improving
UI.

Signed-off-by: Michael Krelin <hacker@klever.net>

2 files changed, 31 insertions, 8 deletions

diff --git a/include/opkele/discovery.h b/include/opkele/discovery.h
index ab4b9d9..677d7bb 100644
--- a/include/opkele/discovery.h
+++ b/include/opkele/discovery.h
@@ -1,104 +1,112 @@
 #ifndef __OPKELE_DISCOVERY_H
 #define __OPKELE_DISCOVERY_H
 
 #include <string>
 #include <opkele/types.h>
 #include <opkele/basic_rp.h>
 
 namespace opkele {
     using std::string;
 
     namespace xrd {
 
 	struct priority_compare {
 	    inline bool operator()(long a,long b) const {
 		return (a<0) ? false : (b<0) ? true : (a<b);
 	    }
 	};
 
 	template <typename _DT>
 	    class priority_map : public multimap<long,_DT,priority_compare> {
 		typedef multimap<long,_DT,priority_compare> map_type;
 		public:
 
 		    inline _DT& add(long priority,const _DT& d) {
 			return insert(typename map_type::value_type(priority,d))->second;
 		    }
 
 		    bool has_value(const _DT& d) const {
 			for(typename map_type::const_iterator i=this->begin();i!=this->end();++i)
 			    if(i->second==d) return true;
 			return false;
 		    }
 	    };
 
 	typedef priority_map<string> canonical_ids_t;
 	typedef priority_map<string> local_ids_t;
 	typedef set<string> types_t;
-	typedef priority_map<string> uris_t;
+	struct uri_t {
+	    string uri;
+	    string append;
+
+	    uri_t() { }
+	    uri_t(const string& u) : uri(u) { }
+	    uri_t(const string& u,const string& a) : uri(u), append(a) { }
+	};
+	typedef priority_map<uri_t> uris_t;
 
 	class service_t {
 	    public:
 		types_t types;
 		uris_t uris;
 		local_ids_t local_ids;
 		string provider_id;
 
 		void clear() {
 		    types.clear();
 		    uris.clear(); local_ids.clear();
 		    provider_id.clear();
 		}
 	};
 	typedef priority_map<service_t> services_t;
 
 	class XRD_t {
 	    public:
 		time_t expires;
 
 		canonical_ids_t canonical_ids;
 		local_ids_t local_ids;
 		services_t services;
 		string provider_id;
 
 		void clear() {
 		    expires = 0;
 		    canonical_ids.clear(); local_ids.clear();
 		    services.clear();
 		    provider_id.clear();
 		}
 		bool empty() const {
 		    return
 			canonical_ids.empty()
 			&& local_ids.empty()
 			&& services.empty();
 		}
 
 	};
 
     }
 
     typedef util::output_iterator_proxy<openid_endpoint_t>
 	endpoint_discovery_iterator;
 
     string idiscover(
 	    endpoint_discovery_iterator oi,
 	    const string& identity);
 
     struct idiscovery_t {
 	bool xri_identity;
 	string normalized_id;
 	string canonicalized_id;
 	xrd::XRD_t xrd;
 
 	idiscovery_t() { }
 
 	void clear() {
 	    normalized_id.clear(); canonicalized_id.clear();
 	    xrd.clear();
 	}
 
     };
 }
 
 #endif /* __OPKELE_DISCOVERY_H */
diff --git a/lib/discovery.cc b/lib/discovery.cc
index 93409f4..6e20654 100644
--- a/lib/discovery.cc
+++ b/lib/discovery.cc
@@ -1,537 +1,552 @@
 #include <list>
 #include <opkele/curl.h>
 #include <opkele/expat.h>
 #include <opkele/uris.h>
 #include <opkele/discovery.h>
 #include <opkele/exception.h>
 #include <opkele/util.h>
 #include <opkele/tidy.h>
 #include <opkele/debug.h>
 
 #include "config.h"
 
 #define XRDS_HEADER "X-XRDS-Location"
 #define CT_HEADER "Content-Type"
 
 namespace opkele {
     using std::list;
     using xrd::XRD_t;
     using xrd::service_t;
 
     /* TODO: the whole discovery thing needs cleanup and optimization due to
      * many changes of concept. */
 
     static const char *whitespace = " \t\r\n";
     static const char *i_leaders = "=@+$!(";
     static const size_t max_html = 16384;
 
     static const struct service_type_t {
 	const char *uri;
 	const char *forceid;
     } service_types[] = {
 	{ STURI_OPENID20_OP, IDURI_SELECT20 },
 	{ STURI_OPENID20, 0 },
 	{ STURI_OPENID11, 0 },
 	{ STURI_OPENID10, 0 }
     };
     enum {
 	st_index_1 = 2, st_index_2 = 1
     };
 
 
     static inline bool is_qelement(const XML_Char *n,const char *qen) {
 	return !strcasecmp(n,qen);
     }
     static inline bool is_element(const XML_Char *n,const char *en) {
 	if(!strcasecmp(n,en)) return true;
 	int nl = strlen(n), enl = strlen(en);
 	if( (nl>=(enl+1)) && n[nl-enl-1]=='\t'
 		&& !strcasecmp(&n[nl-enl],en) )
 	    return true;
 	return false;
     }
 
     static long element_priority(const XML_Char **a) {
 	for(;*a;++a)
 	    if(!strcasecmp(*(a++),"priority")) {
 		long rv;
 		return (sscanf(*a,"%ld",&rv)==1)?rv:-1;
 	    }
 	return -1;
     }
+    /* TODO: ideally all attributes should be
+     * retrieved in one run */
+    static const char *element_attr(const XML_Char **a, const char *at) {
+	for(;*a;++a)
+	    if(!strcasecmp(*(a++),at)) {
+		return *a;
+	    }
+	return 0;
+    }
 
     class idigger_t : public util::curl_t, public util::expat_t {
 	public:
 	    string xri_proxy;
 
 	    enum {
 		xmode_html = 1, xmode_xrd = 2, xmode_cid = 4
 	    };
 	    int xmode;
 
 	    string xrds_location;
 	    string http_content_type;
 	    service_t html_openid1;
 	    service_t html_openid2;
 	    string cdata_buf;
 	    long status_code;
 	    string status_string;
 
 	    typedef list<string> pt_stack_t;
 	    pt_stack_t pt_stack;
 	    int skipping;
 	    bool parser_choked;
 	    string save_html;
 
 	    XRD_t *xrd;
 	    service_t *xrd_service;
 	    string* cdata;
 
 	    idigger_t()
 		: util::curl_t(easy_init()),
 		util::expat_t(0),
 		xri_proxy(XRI_PROXY_URL) {
 		    CURLcode r;
 		    (r=misc_sets())
 			|| (r=set_write())
 			|| (r=set_header())
 			;
 		    if(r)
 			throw exception_curl(OPKELE_CP_ "failed to set curly options",r);
 		}
 	    ~idigger_t() throw() { }
 
 	    string discover(endpoint_discovery_iterator& oi,const string& identity) {
 		string rv;
 		idiscovery_t idis;
 		string::size_type fsc = identity.find_first_not_of(whitespace);
 		if(fsc==string::npos)
 		    throw bad_input(OPKELE_CP_ "whitespace-only identity");
 		string::size_type lsc = identity.find_last_not_of(whitespace);
 		assert(lsc!=string::npos);
 		if(!strncasecmp(identity.c_str()+fsc,"xri://",sizeof("xri://")-1))
 		    fsc += sizeof("xri://")-1;
 		if((fsc+1)>=lsc)
 		    throw bad_input(OPKELE_CP_ "not a character of importance in identity");
 		string id(identity,fsc,lsc-fsc+1);
 		idis.clear();
 		if(strchr(i_leaders,id[0])) {
 		    /* TODO: further normalize xri identity? Like folding case
 		     * or whatever... */
-		    rv = idis.normalized_id = id;
-		    idis.xri_identity = true;
+		    rv = id;
 		    set<string> cids;
 		    for(const struct service_type_t *st=service_types;
 			    st<&service_types[sizeof(service_types)/sizeof(*service_types)];++st) {
 			idis.clear();
 			discover_at( idis,
 				xri_proxy + util::url_encode(id)+
 				"?_xrd_t="+util::url_encode(st->uri)+
 				"&_xrd_r=application/xrd%2Bxml"
 				";sep=true;refs=true",
 				xmode_xrd );
 			if(status_code==241) continue;
 			if(status_code!=100)
 			    throw failed_xri_resolution(OPKELE_CP_
 				    "XRI resolution failed with '"+status_string+"' message"
 				    ", while looking for SEP with type '"+st->uri+"'", status_code);
 			if(idis.xrd.canonical_ids.empty())
 			    throw opkele::failed_discovery(OPKELE_CP_ "No CanonicalID found for XRI identity found");
 			string cid = idis.xrd.canonical_ids.begin()->second;
 			if(cids.find(cid)==cids.end()) {
 			    cids.insert(cid);
 			    idis.clear();
 			    discover_at( idis,
 				    xri_proxy + util::url_encode(id)+
 				    "?_xrd_t="+util::url_encode(st->uri)+
 				    "&_xrd_r=application/xrd%2Bxml"
 				    ";sep=true;refs=true",
 				    xmode_xrd );
 			    if(status_code==241) continue;
 			    if(status_code!=100)
 				throw failed_xri_resolution(OPKELE_CP_
 					"XRI resolution failed with '"+status_string+"' message"
 					", while looking for SEP with type '"+st->uri+"'"
 					" on canonical id", status_code);
 			}
 			idis.canonicalized_id = cid;
+			idis.normalized_id = rv; idis.xri_identity = true;
 			queue_endpoints(oi,idis,st);
 		    }
 		}else{
 		    idis.xri_identity = false;
 		    if(id.find("://")==string::npos)
 			id.insert(0,"http://");
 		    string::size_type fp = id.find('#');
 		    if(fp!=string::npos) {
 			string::size_type qp = id.find('?');
 			if(qp==string::npos || qp<fp)
 			    id.erase(fp);
 			else if(qp>fp)
 			    id.erase(fp,qp-fp);
 		    }
 		    rv = idis.normalized_id = util::rfc_3986_normalize_uri(id);
 		    discover_at(idis,id,xmode_html|xmode_xrd);
 		    const char * eu = 0;
 		    CURLcode r = easy_getinfo(CURLINFO_EFFECTIVE_URL,&eu);
 		    if(r)
 			throw exception_curl(OPKELE_CP_ "failed to get CURLINFO_EFFECTIVE_URL",r);
 		    string cid = util::strip_uri_fragment_part( idis.canonicalized_id = util::rfc_3986_normalize_uri(eu) );
 		    if(xrds_location.empty()) {
 			html2xrd(oi,idis);
 		    }else{
 			idis.clear();
 			idis.canonicalized_id = cid;
 			discover_at(idis,xrds_location,xmode_xrd);
 			if(idis.xrd.empty())
 			    html2xrd(oi,idis);
 			else{
 			    for(const service_type_t *st=service_types;
 				    st<&service_types[sizeof(service_types)/sizeof(*service_types)];++st)
 				queue_endpoints(oi,idis,st);
 			}
 		    }
 		}
 		return rv;
 	    }
 
 	    void discover_at(idiscovery_t& idis,const string& url,int xm) {
-		DOUT_("Doing discovery at " << url);
 		CURLcode r = easy_setopt(CURLOPT_URL,url.c_str());
 		if(r)
 		    throw exception_curl(OPKELE_CP_ "failed to set culry urlie",r);
 
 		http_content_type.clear();
 		xmode = xm;
 		prepare_to_parse();
 		if(xmode&xmode_html) {
 		    xrds_location.clear();
 		    save_html.clear();
 		    save_html.reserve(max_html);
 		}
 		xrd = &idis.xrd;
 
 		r = easy_perform();
 		if(r && r!=CURLE_WRITE_ERROR)
 		    throw exception_curl(OPKELE_CP_ "failed to perform curly request",r);
 
 		if(!parser_choked) {
 		    parse(0,0,true);
 		}else{
 		    /* TODO: do not bother if we've seen xml */
 		    try {
 			util::tidy_doc_t td = util::tidy_doc_t::create();
 			if(!td)
 			    throw exception_tidy(OPKELE_CP_ "failed to create htmltidy document");
 #ifndef NDEBUG
 			td.opt_set(TidyQuiet,false);
 			td.opt_set(TidyShowWarnings,false);
 #endif /* NDEBUG */
 			td.opt_set(TidyForceOutput,true);
 			td.opt_set(TidyXhtmlOut,true);
 			td.opt_set(TidyDoctypeMode,TidyDoctypeOmit);
 			td.opt_set(TidyMark,false);
 			if(td.parse_string(save_html)<=0)
 			    throw exception_tidy(OPKELE_CP_ "tidy failed to parse document");
 			if(td.clean_and_repair()<=0)
 			    throw exception_tidy(OPKELE_CP_ "tidy failed to clean and repair");
 			util::tidy_buf_t tide;
 			if(td.save_buffer(tide)<=0)
 			    throw exception_tidy(OPKELE_CP_ "tidy failed to save buffer");
 			prepare_to_parse();
 			parse(tide.c_str(),tide.size(),true);
 		    }catch(exception_tidy& et) { }
 		}
 		save_html.clear();
 	    }
 
 	    void prepare_to_parse() {
 		(*(expat_t*)this) = parser_create_ns();
 		set_user_data(); set_element_handler();
 		set_character_data_handler();
 
 		if(xmode&xmode_html) {
 		    html_openid1.clear(); html_openid2.clear();
 		    parser_choked = false;
 		}
 
 		cdata = 0; xrd_service = 0; skipping = 0;
 		pt_stack.clear();
 		status_code = 100; status_string.clear();
 	    }
 
 	    void html2xrd(endpoint_discovery_iterator& oi,idiscovery_t& id) {
 		XRD_t& x = id.xrd;
 		if(!html_openid2.uris.empty()) {
 		    html_openid2.types.insert(STURI_OPENID20);
 		    x.services.add(-1,html_openid2);
 		    queue_endpoints(oi,id,&service_types[st_index_2]);
 		}
 		if(!html_openid1.uris.empty()) {
 		    html_openid1.types.insert(STURI_OPENID11);
 		    x.services.add(-1,html_openid1);
 		    queue_endpoints(oi,id,&service_types[st_index_1]);
 		}
 	    }
 
 	    size_t write(void *p,size_t s,size_t nm) {
 		/* TODO: limit total size */
 		size_t bytes = s*nm;
 		const char *inbuf = (const char*)p;
 		if(xmode&xmode_html) {
 		    size_t mbts = save_html.capacity()-save_html.size();
 		    size_t bts = 0;
 		    if(mbts>0) {
 			bts = (bytes>mbts)?mbts:bytes;
 			save_html.append(inbuf,bts);
 		    }
 		    if(skipping<0) return bts;
 		}
 		if(skipping<0) return 0;
 		bool rp = parse(inbuf,bytes,false);
 		if(!rp) {
 		    parser_choked = true;
 		    skipping = -1;
 		    if(!(xmode&xmode_html))
 			bytes = 0;
 		}
 		return bytes;
 	    }
 	    size_t header(void *p,size_t s,size_t nm) {
 		size_t bytes = s*nm;
 		const char *h = (const char*)p;
 		const char *colon = (const char*)memchr(p,':',bytes);
 		const char *space = (const char*)memchr(p,' ',bytes);
 		if(space && ( (!colon) || space<colon ) ) {
 		    xrds_location.clear(); http_content_type.clear();
 		}else if(colon) {
 		    const char *hv = ++colon;
 		    int hnl = colon-h;
 		    int rb;
 		    for(rb = bytes-hnl-1;rb>0 && isspace(*hv);++hv,--rb);
 		    while(rb>0 && isspace(hv[rb-1])) --rb;
 		    if(rb) {
 			if( (hnl>=sizeof(XRDS_HEADER))
 				&& !strncasecmp(h,XRDS_HEADER":",
 				    sizeof(XRDS_HEADER)) ) {
 			    xrds_location.assign(hv,rb);
 			}else if( (hnl>=sizeof(CT_HEADER))
 				&& !strncasecmp(h,CT_HEADER":",
 				    sizeof(CT_HEADER)) ) {
 			    const char *sc = (const char*)memchr(
 				    hv,';',rb);
 			    http_content_type.assign(hv,sc?(sc-hv):rb);
 			}
 		    }
 		}
 		return curl_t::header(p,s,nm);
 	    }
 
 	    void start_element(const XML_Char *n,const XML_Char **a) {
 		if(skipping<0) return;
 		if(skipping) {
 		    if(xmode&xmode_html)
 			html_start_element(n,a);
 		    ++skipping; return;
 		}
 		if(pt_stack.empty()) {
 		    if(is_qelement(n,NSURI_XRDS "\tXRDS"))
 			return;
 		    if(is_qelement(n,NSURI_XRD "\tXRD")) {
 			assert(xrd);
 			xrd->clear();
 			pt_stack.push_back(n);
 		    }else if(xmode&xmode_html) {
 			html_start_element(n,a);
 		    }else{
 			skipping = -1;
 		    }
 		}else{
 		    int pt_s = pt_stack.size();
 		    if(pt_s==1) {
 			if(is_qelement(n,NSURI_XRD "\tCanonicalID")) {
 			    assert(xrd);
 			    cdata = &(xrd->canonical_ids.add(element_priority(a),string()));
 			}else if(is_qelement(n,NSURI_XRD "\tLocalID")) {
 			    assert(xrd);
 			    cdata = &(xrd->local_ids.add(element_priority(a),string()));
 			}else if(is_qelement(n,NSURI_XRD "\tProviderID")) {
 			    assert(xrd);
 			    cdata = &(xrd->provider_id);
 			}else if(is_qelement(n,NSURI_XRD "\tService")) {
 			    assert(xrd);
 			    xrd_service = &(xrd->services.add(element_priority(a),
 					service_t()));
 			    pt_stack.push_back(n);
 			}else if(is_qelement(n,NSURI_XRD "\tStatus")) {
 			    for(;*a;) {
 				if(!strcasecmp(*(a++),"code")) {
 				    if(sscanf(*(a++),"%ld",&status_code)==1 && status_code!=100) {
 					cdata = &status_string;
 					pt_stack.push_back(n);
 					break;
 				    }
 				}else
 				    ++a;
 			    }
 			}else if(is_qelement(n,NSURI_XRD "\tExpires")) {
 			    assert(xrd);
 			    cdata_buf.clear();
 			    cdata = &cdata_buf;
 			}else if(xmode&xmode_html) {
 			    html_start_element(n,a);
 			}else{
 			    skipping = 1;
 			}
 		    }else if(pt_s==2) {
 			if(is_qelement(pt_stack.back().c_str(), NSURI_XRD "\tService")) {
 			    if(is_qelement(n,NSURI_XRD "\tType")) {
 				assert(xrd); assert(xrd_service);
 				cdata_buf.clear();
 				cdata = &cdata_buf;
 			    }else if(is_qelement(n,NSURI_XRD "\tURI")) {
 				assert(xrd); assert(xrd_service);
-				cdata = &(xrd_service->uris.add(element_priority(a),string()));
+				const char *append = element_attr(a,"append");
+				xrd::uri_t& uri = xrd_service->uris.add(element_priority(a),xrd::uri_t("",append?append:""));
+				cdata = &uri.uri;
 			    }else if(is_qelement(n,NSURI_XRD "\tLocalID")
 				    || is_qelement(n,NSURI_OPENID10 "\tDelegate") ) {
 				assert(xrd); assert(xrd_service);
 				cdata = &(xrd_service->local_ids.add(element_priority(a),string()));
 			    }else if(is_qelement(n,NSURI_XRD "\tProviderID")) {
 				    assert(xrd); assert(xrd_service);
 				    cdata = &(xrd_service->provider_id);
 			    }else{
 				skipping = 1;
 			    }
 			}else
 			    skipping = 1;
 		    }else if(xmode&xmode_html) {
 			html_start_element(n,a);
 		    }else{
 			skipping = 1;
 		    }
 		}
 	    }
 	    void end_element(const XML_Char *n) {
 		if(skipping<0) return;
 		if(skipping) {
 		    --skipping; return;
 		}
 		if(is_qelement(n,NSURI_XRD "\tType")) {
 		    assert(xrd); assert(xrd_service); assert(cdata==&cdata_buf);
 		    xrd_service->types.insert(cdata_buf);
 		}else if(is_qelement(n,NSURI_XRD "\tService")) {
 		    assert(xrd); assert(xrd_service);
 		    assert(!pt_stack.empty());
 		    assert(pt_stack.back()==(NSURI_XRD "\tService"));
 		    pt_stack.pop_back();
 		    xrd_service = 0;
 		}else if(is_qelement(n,NSURI_XRD "\tStatus")) {
 		    assert(xrd);
 		    if(is_qelement(pt_stack.back().c_str(),n)) {
 			assert(cdata==&status_string);
 			pt_stack.pop_back();
 			if(status_code!=100)
 			    skipping = -1;
 		    }
 		}else if(is_qelement(n,NSURI_XRD "\tExpires")) {
 		    assert(xrd);
 		    xrd->expires = util::w3c_to_time(cdata_buf);
 		}else if((xmode&xmode_html) && is_element(n,"head")) {
 		    skipping = -1;
 		}
 		cdata = 0;
 	    }
 	    void character_data(const XML_Char *s,int l) {
 		if(skipping) return;
 		if(cdata) cdata->append(s,l);
 	    }
 
 	    void html_start_element(const XML_Char *n,const XML_Char **a) {
 		if(is_element(n,"meta")) {
 		    bool heq = false;
 		    string l;
 		    for(;*a;a+=2) {
 			if(!( strcasecmp(a[0],"http-equiv")
 				|| strcasecmp(a[1],XRDS_HEADER) ))
 			    heq = true;
 			else if(!strcasecmp(a[0],"content"))
 			    l.assign(a[1]);
 		    }
 		    if(heq)
 			xrds_location = l;
 		}else if(is_element(n,"link")) {
 		    string rels;
 		    string href;
 		    for(;*a;a+=2) {
 			if( !strcasecmp(a[0],"rel") ) {
 			    rels.assign(a[1]);
 			}else if( !strcasecmp(a[0],"href") ) {
 			    const char *ns = a[1];
 			    for(;*ns && isspace(*ns);++ns);
 			    href.assign(ns);
 			    string::size_type lns=href.find_last_not_of(whitespace);
 			    href.erase(lns+1);
 			}
 		    }
 		    for(string::size_type ns=rels.find_first_not_of(whitespace);
 			    ns!=string::npos; ns=rels.find_first_not_of(whitespace,ns)) {
 			string::size_type s = rels.find_first_of(whitespace,ns);
 			string rel;
 			if(s==string::npos) {
 			    rel.assign(rels,ns,string::npos);
 			    ns = string::npos;
 			}else{
 			    rel.assign(rels,ns,s-ns);
 			    ns = s;
 			}
 			if(rel=="openid.server")
-			    html_openid1.uris.add(-1,href);
+			    html_openid1.uris.add(-1,xrd::uri_t(href));
 			else if(rel=="openid.delegate")
 			    html_openid1.local_ids.add(-1,href);
 			else if(rel=="openid2.provider")
-			    html_openid2.uris.add(-1,href);
+			    html_openid2.uris.add(-1,xrd::uri_t(href));
 			else if(rel=="openid2.local_id")
 			    html_openid2.local_ids.add(-1,href);
 		    }
 		}else if(is_element(n,"body")) {
 		    skipping = -1;
 		}
 	    }
 
 	    void queue_endpoints(endpoint_discovery_iterator& oi,
 		    const idiscovery_t &id,
 		    const service_type_t *st) {
 		openid_endpoint_t ep;
 		ep.claimed_id = id.canonicalized_id;
 		for(xrd::services_t::const_iterator isvc=id.xrd.services.begin();
 			isvc!=id.xrd.services.end(); ++isvc) {
 		    const xrd::service_t svc = isvc->second;
 		    if(svc.types.find(st->uri)==svc.types.end()) continue;
 		    for(xrd::uris_t::const_iterator iu=svc.uris.begin();iu!=svc.uris.end();++iu) {
-			ep.uri = iu->second;
+			ep.uri = iu->second.uri;
+			if(id.xri_identity) {
+			    if(iu->second.append=="qxri") {
+				ep.uri += id.normalized_id;
+			    } /* TODO: else handle other append attribute values */
+			}
 			if(st->forceid) {
 			    ep.local_id = ep.claimed_id = st->forceid;
 			    *(oi++) = ep;
 			}else{
 			    if(svc.local_ids.empty()) {
 				ep.local_id = ep.claimed_id;
 				*(oi++) = ep;
 			    }else{
 				for(xrd::local_ids_t::const_iterator ilid=svc.local_ids.begin();
 					ilid!=svc.local_ids.end(); ++ilid) {
 				    ep.local_id = ilid->second;
 				    *(oi++) = ep;
 				}
 			    }
 			}
 		    }
 		}
 	    }
 
     };
 
     string idiscover(endpoint_discovery_iterator oi,const string& identity) {
 	idigger_t idigger;
 	return idigger.discover(oi,identity);
     }
 
 }