util.encodings: Support for ICU for IDNA operations.

1 files changed, 373 insertions, 0 deletions

diff --git a/util-src/encodings.cpp b/util-src/encodings.cpp
new file mode 100644
index 00000000..da2d10bb
--- /dev/null
+++ b/util-src/encodings.cpp
@@ -0,0 +1,373 @@
+/* Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+-- 
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+*/
+
+/*
+* encodings.c
+* Lua library for base64, stringprep and idna encodings
+*/
+
+// Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way
+#define _CRT_SECURE_NO_DEPRECATE
+
+extern "C" {
+#include <string.h>
+#include <stdlib.h>
+#include "lua.h"
+#include "lauxlib.h"
+}
+/***************** BASE64 *****************/
+
+#define LUALIB_API extern "C"
+
+static const char code[]=
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
+{
+	unsigned long tuple=c3+256UL*(c2+256UL*c1);
+	int i;
+	char s[4];
+	for (i=0; i<4; i++) {
+		s[3-i] = code[tuple % 64];
+		tuple /= 64;
+	}
+	for (i=n+1; i<4; i++) s[i]='=';
+	luaL_addlstring(b,s,4);
+}
+
+static int Lbase64_encode(lua_State *L)		/** encode(s) */
+{
+	size_t l;
+	const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
+	luaL_Buffer b;
+	int n;
+	luaL_buffinit(L,&b);
+	for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
+	switch (l%3)
+	{
+		case 1: base64_encode(&b,s[0],0,0,1);		break;
+		case 2: base64_encode(&b,s[0],s[1],0,2);		break;
+	}
+	luaL_pushresult(&b);
+	return 1;
+}
+
+static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
+{
+	unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
+	char s[3];
+	switch (--n)
+	{
+		case 3: s[2]=(char) tuple;
+		case 2: s[1]=(char) (tuple >> 8);
+		case 1: s[0]=(char) (tuple >> 16);
+	}
+	luaL_addlstring(b,s,n);
+}
+
+static int Lbase64_decode(lua_State *L)		/** decode(s) */
+{
+	size_t l;
+	const char *s=luaL_checklstring(L,1,&l);
+	luaL_Buffer b;
+	int n=0;
+	char t[4];
+	luaL_buffinit(L,&b);
+	for (;;)
+	{
+		int c=*s++;
+		switch (c)
+		{
+			const char *p;
+			default:
+				p=strchr(code,c); if (p==NULL) return 0;
+				t[n++]= (char) (p-code);
+				if (n==4)
+				{
+					base64_decode(&b,t[0],t[1],t[2],t[3],4);
+					n=0;
+				}
+				break;
+			case '=':
+				switch (n)
+				{
+					case 1: base64_decode(&b,t[0],0,0,0,1);		break;
+					case 2: base64_decode(&b,t[0],t[1],0,0,2);	break;
+					case 3: base64_decode(&b,t[0],t[1],t[2],0,3);	break;
+				}
+				n=0;
+				break;
+			case 0:
+				luaL_pushresult(&b);
+				return 1;
+			case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
+				break;
+		}
+	}
+}
+
+static const luaL_Reg Reg_base64[] =
+{
+	{ "encode",	Lbase64_encode	},
+	{ "decode",	Lbase64_decode	},
+	{ NULL,		NULL	}
+};
+
+/***************** STRINGPREP *****************/
+#ifndef USE_STRINGPREP_ICU
+/****************** libidn ********************/
+#include <stringprep.h>
+
+static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
+{
+	size_t len;
+	const char *s;
+	char string[1024];
+	int ret;
+	if(!lua_isstring(L, 1)) {
+		lua_pushnil(L);
+		return 1;
+	}
+	s = lua_tolstring(L, 1, &len);
+	if (len >= 1024) {
+		lua_pushnil(L);
+		return 1; // TODO return error message
+	}
+	strcpy(string, s);
+	ret = stringprep(string, 1024, 0, profile);
+	if (ret == STRINGPREP_OK) {
+		lua_pushstring(L, string);
+		return 1;
+	} else {
+		lua_pushnil(L);
+		return 1; // TODO return error message
+	}
+}
+
+#define MAKE_PREP_FUNC(myFunc, prep) \
+static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
+
+MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep)		/** stringprep.nameprep(s) */
+MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep)		/** stringprep.nodeprep(s) */
+MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep)		/** stringprep.resourceprep(s) */
+MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep)		/** stringprep.saslprep(s) */
+
+static const luaL_Reg Reg_stringprep[] =
+{
+	{ "nameprep",	Lstringprep_nameprep	},
+	{ "nodeprep",	Lstringprep_nodeprep	},
+	{ "resourceprep",	Lstringprep_resourceprep	},
+	{ "saslprep",	Lstringprep_saslprep	},
+	{ NULL,		NULL	}
+};
+
+#else
+#include <unicode/usprep.h>
+//#include <unicode/stringpiece.h>
+#include <unicode/unistr.h>
+#include <unicode/utrace.h>
+
+static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
+{
+	size_t len;
+	const char *s;
+	UnicodeString ustr;
+	UErrorCode err = U_ZERO_ERROR;
+	UChar dest[1024];
+	char output[1024];
+	if(!lua_isstring(L, 1)) {
+		lua_pushnil(L);
+		return 1;
+	}
+	s = lua_tolstring(L, 1, &len);
+	if (len >= 1024) {
+		lua_pushnil(L);
+		return 1; // TODO return error message
+	}
+	ustr = UnicodeString::fromUTF8(s); 
+	len = usprep_prepare(profile, ustr.getBuffer(), ustr.length(), dest, 1024, 0, NULL, &err);
+	if (U_FAILURE(err)) {
+		lua_pushnil(L);
+		return 1;
+	} else {
+		CheckedArrayByteSink output_sink(output, 1024);
+		UnicodeString dest_str(TRUE, dest, len);
+		dest_str.toUTF8(output_sink);
+		lua_pushstring(L, output);
+		return 1;
+	}
+}
+
+UStringPrepProfile *icu_nameprep;
+UStringPrepProfile *icu_nodeprep;
+UStringPrepProfile *icu_resourceprep; 
+UStringPrepProfile *icu_saslprep;
+
+/* initialize global ICU stringprep profiles */
+void init_icu()
+{
+	UErrorCode err = U_ZERO_ERROR;
+	utrace_setLevel(UTRACE_VERBOSE);
+	icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
+	icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
+	icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
+	icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
+	if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
+}
+
+#define MAKE_PREP_FUNC(myFunc, prep) \
+static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
+
+MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep)		/** stringprep.nameprep(s) */
+MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep)		/** stringprep.nodeprep(s) */
+MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep)		/** stringprep.resourceprep(s) */
+MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep)		/** stringprep.saslprep(s) */
+
+static const luaL_Reg Reg_stringprep[] =
+{
+	{ "nameprep",	Lstringprep_nameprep	},
+	{ "nodeprep",	Lstringprep_nodeprep	},
+	{ "resourceprep",	Lstringprep_resourceprep	},
+	{ "saslprep",	Lstringprep_saslprep	},
+	{ NULL,		NULL	}
+};
+#endif
+
+/***************** IDNA *****************/
+#ifndef USE_STRINGPREP_ICU
+/****************** libidn ********************/
+#include <idna.h>
+#include <idn-free.h>
+static int Lidna_to_ascii(lua_State *L)		/** idna.to_ascii(s) */
+{
+	size_t len;
+	const char *s = luaL_checklstring(L, 1, &len);
+	char* output = NULL;
+	int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
+	if (ret == IDNA_SUCCESS) {
+		lua_pushstring(L, output);
+		idn_free(output);
+		return 1;
+	} else {
+		lua_pushnil(L);
+		idn_free(output);
+		return 1; // TODO return error message
+	}
+}
+
+static int Lidna_to_unicode(lua_State *L)		/** idna.to_unicode(s) */
+{
+	size_t len;
+	const char *s = luaL_checklstring(L, 1, &len);
+	char* output = NULL;
+	int ret = idna_to_unicode_8z8z(s, &output, 0);
+	if (ret == IDNA_SUCCESS) {
+		lua_pushstring(L, output);
+		idn_free(output);
+		return 1;
+	} else {
+		lua_pushnil(L);
+		idn_free(output);
+		return 1; // TODO return error message
+	}
+}
+#else
+#include <unicode/ustdio.h>
+#include <unicode/uidna.h>
+/* IDNA2003 or IDNA2008 ? ? ? */
+static int Lidna_to_ascii(lua_State *L)		/** idna.to_ascii(s) */
+{
+	size_t len;
+	int32_t out_len;
+	const char *s = luaL_checklstring(L, 1, &len);
+	UnicodeString ustr;
+	UErrorCode err = U_ZERO_ERROR;
+	UChar dest[1024];
+	char output[1024];
+
+	ustr = UnicodeString::fromUTF8(s); 
+	out_len = uidna_IDNToASCII(ustr.getBuffer(), ustr.length(), dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
+	if (U_FAILURE(err)) {
+		lua_pushnil(L);
+		return 1;
+	} else {
+		CheckedArrayByteSink output_sink(output, 1024);
+		UnicodeString dest_str(TRUE, dest, out_len);
+		dest_str.toUTF8(output_sink);
+		lua_pushstring(L, output);
+		return 1;
+	}
+}
+
+static int Lidna_to_unicode(lua_State *L)		/** idna.to_unicode(s) */
+{
+	size_t len;
+	int32_t out_len;
+	const char *s = luaL_checklstring(L, 1, &len);
+	UnicodeString ustr;
+	UErrorCode err = U_ZERO_ERROR;
+	UChar dest[1024];
+	char output[1024];
+
+	ustr = UnicodeString::fromUTF8(s); 
+	out_len = uidna_IDNToUnicode(ustr.getBuffer(), ustr.length(), dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
+	if (U_FAILURE(err)) {
+		lua_pushnil(L);
+		return 1;
+	} else {
+		CheckedArrayByteSink output_sink(output, 1024);
+		UnicodeString dest_str(TRUE, dest, out_len);
+		dest_str.toUTF8(output_sink);
+		lua_pushstring(L, output);
+		return 1;
+	}
+}
+#endif
+
+static const luaL_Reg Reg_idna[] =
+{
+	{ "to_ascii",	Lidna_to_ascii	},
+	{ "to_unicode",	Lidna_to_unicode	},
+	{ NULL,		NULL	}
+};
+
+/***************** end *****************/
+
+static const luaL_Reg Reg[] =
+{
+	{ NULL,		NULL	}
+};
+
+LUALIB_API int luaopen_util_encodings(lua_State *L)
+{
+#ifdef USE_STRINGPREP_ICU
+	init_icu();
+#endif
+	luaL_register(L, "encodings", Reg);
+
+	lua_pushliteral(L, "base64");
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_base64);
+	lua_settable(L,-3);
+
+	lua_pushliteral(L, "stringprep");
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_stringprep);
+	lua_settable(L,-3);
+
+	lua_pushliteral(L, "idna");
+	lua_newtable(L);
+	luaL_register(L, NULL, Reg_idna);
+	lua_settable(L,-3);
+
+	lua_pushliteral(L, "version");			/** version */
+	lua_pushliteral(L, "-3.14");
+	lua_settable(L,-3);
+	return 1;
+}