introduced base_message class as a base for basic_openid_message

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

1 files changed, 270 insertions, 0 deletions

diff --git a/lib/message.cc b/lib/message.cc
new file mode 100644
index 0000000..78f20f4
--- a/dev/null
+++ b/lib/message.cc
@@ -0,0 +1,270 @@
+#include <cassert>
+#include <opkele/types.h>
+#include <opkele/exception.h>
+#include <opkele/util.h>
+#include <opkele/debug.h>
+
+#include "config.h"
+
+namespace opkele {
+    using std::input_iterator_tag;
+    using std::unary_function;
+
+    struct __om_copier : public unary_function<const string&,void> {
+        public:
+            const basic_message& from;
+            basic_message& to;
+
+            __om_copier(basic_message& t,const basic_message& f)
+                : from(f), to(t) { }
+
+            result_type operator()(argument_type f) {
+                to.set_field(f,from.get_field(f)); }
+    };
+
+    basic_message::basic_message(const basic_message& x) {
+        x.copy_to(*this);
+    }
+    void basic_message::copy_to(basic_message& x) const {
+        x.reset_fields();
+        for_each(fields_begin(),fields_end(),
+                __om_copier(x,*this) );
+    }
+    void basic_message::append_to(basic_message& x) const {
+        for_each(fields_begin(),fields_end(),
+                __om_copier(x,*this) );
+    }
+
+    struct __om_query_builder : public unary_function<const string&,void> {
+        public:
+            const basic_message& om;
+            bool first;
+            string& rv;
+            const char *pfx;
+
+            __om_query_builder(const char *p,string& r,const basic_message& m)
+                : om(m), first(true), rv(r), pfx(p) {
+                    for_each(om.fields_begin(),om.fields_end(),*this);
+                }
+            __om_query_builder(const char *p,string& r,const basic_message& m,const string& u)
+                : om(m), first(true), rv(r), pfx(p) {
+                    rv = u;
+                    if(rv.find('?')==string::npos)
+                        rv += '?';
+                    else
+                        first = false;
+                    for_each(om.fields_begin(),om.fields_end(),*this);
+                }
+
+            result_type operator()(argument_type f) {
+                if(first)
+                    first = false;
+                else
+                    rv += '&';
+                if(pfx) rv += pfx;
+                rv+= f;
+                rv += '=';
+                rv += util::url_encode(om.get_field(f));
+            }
+    };
+
+    string basic_message::append_query(const string& url,const char *pfx) const {
+        string rv;
+        return __om_query_builder(pfx,rv,*this,url).rv;
+    }
+    string basic_message::query_string(const char *pfx) const {
+        string rv;
+        return __om_query_builder(pfx,rv,*this).rv;
+    }
+
+    void basic_message::reset_fields() {
+        throw not_implemented(OPKELE_CP_ "reset_fields() not implemented");
+    }
+    void basic_message::set_field(const string&,const string&) {
+        throw not_implemented(OPKELE_CP_ "set_field() not implemented");
+    }
+    void basic_message::reset_field(const string&) {
+        throw not_implemented(OPKELE_CP_ "reset_field() not implemented");
+    }
+
+    struct __om_ns_finder : public unary_function<const string&,bool> {
+        public:
+            const basic_openid_message& om;
+            const string& uri;
+
+            __om_ns_finder(const basic_openid_message& m,
+                    const string& u) : om(m), uri(u) { }
+
+            result_type operator()(argument_type f) {
+                return
+                    (!strncmp(f.c_str(),"ns.",sizeof("ns.")-1))
+                        && om.get_field(f)==uri ;
+            }
+    };
+
+    bool basic_openid_message::has_ns(const string& uri) const {
+        fields_iterator ei = fields_end();
+        fields_iterator i = find_if(fields_begin(),fields_end(),
+                __om_ns_finder(*this,uri));
+        return !(i==ei);
+    }
+    string basic_openid_message::get_ns(const string& uri) const {
+        fields_iterator ei = fields_end();
+        fields_iterator i = find_if(fields_begin(),fields_end(),
+                __om_ns_finder(*this,uri));
+        if(i==ei)
+            throw failed_lookup(OPKELE_CP_ string("failed to find namespace ")+uri);
+        return i->substr(3);
+    }
+
+    void basic_openid_message::from_keyvalues(const string& kv) {
+        reset_fields();
+        string::size_type p = 0;
+        while(true) {
+            string::size_type co = kv.find(':',p);
+            if(co==string::npos)
+                break;
+#ifndef POSTELS_LAW
+            string::size_type nl = kv.find('\n',co+1);
+            if(nl==string::npos)
+                throw bad_input(OPKELE_CP_ "malformed input");
+            if(nl>co)
+                insert(value_type(kv.substr(p,co-p),kv.substr(co+1,nl-co-1)));
+            p = nl+1;
+#else /* POSTELS_LAW */
+            string::size_type lb = kv.find_first_of("\r\n",co+1);
+            if(lb==string::npos) {
+                set_field(kv.substr(p,co-p),kv.substr(co+1));
+                break;
+            }
+            if(lb>co)
+                set_field(kv.substr(p,co-p),kv.substr(co+1,lb-co-1));
+            string::size_type nolb = kv.find_first_not_of("\r\n",lb);
+            if(nolb==string::npos)
+                break;
+            p = nolb;
+#endif /* POSTELS_LAW */
+        }
+    }
+
+    struct __om_kv_outputter : public unary_function<const string&,void> {
+        public:
+            const basic_openid_message& om;
+            ostream& os;
+
+            __om_kv_outputter(const basic_openid_message& m,ostream& s)
+                : om(m), os(s) { }
+
+            result_type operator()(argument_type f) {
+                os << f << ':' << om.get_field(f) << '\n';
+            }
+    };
+
+    void basic_openid_message::to_keyvalues(ostream& o) const {
+        for_each(fields_begin(),fields_end(),__om_kv_outputter(*this,o));
+    }
+
+    struct __om_html_outputter : public unary_function<const string&,void> {
+        public:
+            const basic_openid_message& om;
+            ostream& os;
+            const char *pfx;
+
+            __om_html_outputter(const basic_openid_message& m,ostream& s,const char *p=0)
+                : om(m), os(s), pfx(p) { }
+
+            result_type operator()(argument_type f) {
+                os <<
+                    "<input type=\"hidden\""
+                    " name=\"";
+                if(pfx)
+                    os << util::attr_escape(pfx);
+                os << util::attr_escape(f) << "\""
+                    " value=\"" << util::attr_escape(om.get_field(f)) << "\" />";
+            }
+    };
+
+    void basic_openid_message::to_htmlhiddens(ostream& o,const char* pfx) const {
+        for_each(fields_begin(),fields_end(),__om_html_outputter(*this,o,pfx));
+    }
+
+    void basic_openid_message::add_to_signed(const string& fields) {
+        string::size_type fnc = fields.find_first_not_of(",");
+        if(fnc==string::npos)
+            throw bad_input(OPKELE_CP_ "Trying to add nothing in particular to the list of signed fields");
+        string signeds;
+        try {
+            signeds = get_field("signed");
+            string::size_type lnc = signeds.find_last_not_of(",");
+            if(lnc==string::npos)
+                signeds.assign(fields,fnc,fields.size()-fnc);
+            else{
+                string::size_type ss = signeds.size();
+                if(lnc==(ss-1)) {
+                    signeds+= ',';
+                    signeds.append(fields,fnc,fields.size()-fnc);
+                }else{
+                    if(lnc<(ss-2))
+                        signeds.replace(lnc+2,ss-lnc-2,
+                                fields,fnc,fields.size()-fnc);
+                    else
+                        signeds.append(fields,fnc,fields.size()-fnc);
+                }
+            }
+        }catch(failed_lookup&) {
+            signeds.assign(fields,fnc,fields.size()-fnc);
+        }
+        set_field("signed",signeds);
+    }
+
+    string basic_openid_message::find_ns(const string& uri,const char *pfx) const {
+        try {
+            return get_ns(uri);
+        }catch(failed_lookup&) {
+            return pfx;
+        }
+    }
+    string basic_openid_message::allocate_ns(const string& uri,const char *pfx) {
+        if(!has_field("ns"))
+            return pfx;
+        if(has_ns(uri))
+            throw bad_input(OPKELE_CP_ "OpenID message already contains namespace");
+        string rv = pfx;
+        if(has_field("ns."+rv)) {
+            string::reference c=rv[rv.length()];
+            for(c='a';c<='z' && has_field("ns."+rv);++c);
+            if(c=='z')
+                throw exception(OPKELE_CP_ "Failed to allocate namespace");
+        }
+        set_field("ns."+rv,uri);
+        return rv;
+    }
+
+    bool openid_message_t::has_field(const string& n) const {
+        return find(n)!=end();
+    }
+    const string& openid_message_t::get_field(const string& n) const {
+        const_iterator i=find(n);
+        if(i==end())
+            throw failed_lookup(OPKELE_CP_ n+": no such field");
+        return i->second;
+    }
+
+    openid_message_t::fields_iterator openid_message_t::fields_begin() const {
+        return util::map_keys_iterator<const_iterator,string,const string&,const string*>(begin(),end());
+    }
+    openid_message_t::fields_iterator openid_message_t::fields_end() const {
+        return util::map_keys_iterator<const_iterator,string,const string&,const string*>(end(),end());
+    }
+
+    void openid_message_t::reset_fields() {
+        clear();
+    }
+    void openid_message_t::set_field(const string& n,const string& v) {
+        (*this)[n]=v;
+    }
+    void openid_message_t::reset_field(const string& n) {
+        erase(n);
+    }
+
+}