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-rw-r--r--lib/discovery.cc375
1 files changed, 375 insertions, 0 deletions
diff --git a/lib/discovery.cc b/lib/discovery.cc
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+++ b/lib/discovery.cc
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+#include <iostream>
+using namespace std;
+#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 "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;
+
+ static const char *whitespace = " \t\r\n";
+ static const char *i_leaders = "=@+$!(";
+
+ 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;
+ }
+
+ class idigger_t : public util::curl_t, public util::expat_t {
+ public:
+ string xri_proxy;
+
+ enum {
+ xmode_html = 1, xmode_xrd = 2
+ };
+ 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;
+
+ 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() { }
+
+ void discover(idiscovery_t& result,const string& identity) {
+ result.clear();
+ string::size_type fsc = identity.find_first_not_of(whitespace);
+ if(fsc==string::npos)
+ throw bad_input(OPKELE_CP_ "whtiespace-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);
+ if(strchr(i_leaders,id[0])) {
+ result.normalized_id = id;
+ /* TODO: further canonicalize xri identity? Like folding case or whatever... */
+ discover_at(
+ result,
+ xri_proxy + util::url_encode(id)+
+ "?_xrd_r=application/xrd+xml;sep=false", xmode_xrd);
+ if(status_code!=100)
+ throw failed_xri_resolution(OPKELE_CP_
+ "XRI resolution failed with '"+status_string+"' message",status_code);
+ if(result.xrd.canonical_ids.empty())
+ throw opkele::failed_discovery(OPKELE_CP_ "No CanonicalID for XRI identity found");
+ }else{
+ 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);
+ }
+ result.normalized_id = util::rfc_3986_normalize_uri(id);
+ discover_at(result,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);
+ result.canonicalized_id = util::rfc_3986_normalize_uri(eu); /* XXX: strip fragment part? */
+ if(xrds_location.empty()) {
+ html2xrd(result.xrd);
+ }else{
+ discover_at(result,xrds_location,xmode_xrd);
+ if(result.xrd.empty())
+ html2xrd(result.xrd);
+ }
+ }
+ }
+
+ void discover_at(idiscovery_t& result,const string& url,int xm) {
+ CURLcode r = easy_setopt(CURLOPT_URL,url.c_str());
+ if(r)
+ throw exception_curl(OPKELE_CP_ "failed to set culry urlie",r);
+
+ (*(expat_t*)this) = parser_create_ns();
+ set_user_data(); set_element_handler();
+ set_character_data_handler();
+
+ xrds_location.clear(); http_content_type.clear();
+ xmode = xm;
+ if(xmode&xmode_html) {
+ xrds_location.clear();
+ html_openid1.clear(); html_openid2.clear();
+ }
+ xrd = &result.xrd;
+ cdata = 0; xrd_service = 0; skipping = 0;
+ status_code = 100; status_string.clear();
+
+ r = easy_perform();
+ if(r && r!=CURLE_WRITE_ERROR)
+ throw exception_curl(OPKELE_CP_ "failed to perform curly request",r);
+
+ parse(0,0,true);
+ }
+
+ void html2xrd(XRD_t& x) {
+ if(!html_openid1.uris.empty()) {
+ html_openid1.types.insert(STURI_OPENID11);
+ x.services.add(-1,html_openid1);
+ }
+ if(!html_openid2.uris.empty()) {
+ html_openid2.types.insert(STURI_OPENID20);
+ x.services.add(-1,html_openid2);
+ }
+ }
+
+ size_t write(void *p,size_t s,size_t nm) {
+ if(skipping<0) return 0;
+ /* TODO: limit total size */
+ size_t bytes = s*nm;
+ parse((const char *)p,bytes,false);
+ 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) {
+ /* TODO: xrd:XRD/xrd:Expires */
+ 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 "\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 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()));
+ }else if(is_qelement(n,NSURI_XRD "\tLocalID")
+ || is_qelement(n,NSURI_OPENID10 "\tDelegate") ) {
+ assert(xrd); assert(xrd_service);
+ cdata = &(xrd_service->uris.add(element_priority(a),string()));
+ }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((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);
+ else if(rel=="openid.delegate")
+ html_openid1.local_ids.add(-1,href);
+ else if(rel=="openid2.provider")
+ html_openid2.uris.add(-1,href);
+ else if(rel=="openid2.local_id")
+ html_openid2.local_ids.add(-1,href);
+ }
+ }else if(is_element(n,"body")) {
+ skipping = -1;
+ }
+ }
+
+ };
+
+ void idiscover(idiscovery_t& result,const string& identity) {
+ idigger_t idigger;
+ idigger.discover(result,identity);
+ }
+
+}