[mod_rewrite] Use liPattern

personal/stbuehler/wip
Stefan Bühler 12 years ago
parent d6820e5cfd
commit 9d6eb1394d
  1. 348
      src/modules/mod_rewrite.c

@ -50,8 +50,9 @@
* - implement rewrite_optimized which reorders rules according to hitcount
* - implement rewrite_raw which uses the raw uri
*
* Author:
* Authors:
* Copyright (c) 2009 Thomas Porzelt
* Copyright (c) 2010 Stefan Bühler
* License:
* MIT, see COPYING file in the lighttpd 2 tree
*/
@ -62,256 +63,115 @@
LI_API gboolean mod_rewrite_init(liModules *mods, liModule *mod);
LI_API gboolean mod_rewrite_free(liModules *mods, liModule *mod);
typedef struct rewrite_plugin_data rewrite_plugin_data;
struct rewrite_plugin_data {
GPtrArray *tmp_strings; /* array of (GString*) */
};
typedef struct rewrite_plugin_data rewrite_plugin_data;
struct rewrite_part {
enum {
REWRITE_PART_STRING,
REWRITE_PART_CAPTURED,
REWRITE_PART_CAPTURED_PREV,
REWRITE_PART_VAR,
REWRITE_PART_VAR_ENCODED,
REWRITE_PART_QUERYSTRING
} type;
union {
GString *str;
guint8 ndx;
liCondLValue cond_lval;
} data;
};
typedef struct rewrite_part rewrite_part;
typedef struct rewrite_rule rewrite_rule;
struct rewrite_rule {
GArray *parts;
liPattern *path, *querystring;
GRegex *regex;
gboolean has_querystring;
};
typedef struct rewrite_rule rewrite_rule;
typedef struct rewrite_data rewrite_data;
struct rewrite_data {
GArray *rules;
liPlugin *p;
};
typedef struct rewrite_data rewrite_data;
static gboolean rewrite_rule_parse(liServer *srv, GString *regex, GString *str, rewrite_rule *rule) {
gchar *qs;
rule->path = rule->querystring = NULL;
rule->regex = NULL;
static void rewrite_parts_free(GArray *parts) {
guint i;
for (i = 0; i < parts->len; i++) {
rewrite_part *rp = &g_array_index(parts, rewrite_part, i);
/* find "not-escaped" ? */
for (qs = str->str; *qs; qs++) {
if ('\\' == *qs) {
qs++;
if (!*qs) break;
} else if ('?' == *qs) break;
}
if (!*qs) qs = NULL;
switch (rp->type) {
case REWRITE_PART_STRING: g_string_free(rp->data.str, TRUE); break;
default: break;
if (NULL != qs) {
*qs = '\0'; /* restore later */
rule->querystring = li_pattern_new(srv, qs+1);
if (NULL == rule->querystring) {
goto error;
}
}
g_array_free(parts, TRUE);
}
rule->path = li_pattern_new(srv, str->str);
if (NULL == rule->path) {
goto error;
}
static GArray *rewrite_parts_parse(GString *str, gboolean *has_querystring) {
rewrite_part rp;
gboolean encoded;
gchar *c = str->str;
GArray *parts = g_array_new(FALSE, FALSE, sizeof(rewrite_part));
for (;;) {
if (*c == '\0') {
break;
} else if (*c == '?') {
/* querystring */
rp.type = REWRITE_PART_QUERYSTRING;
g_array_append_val(parts, rp);
c++;
*has_querystring = TRUE;
} else if (*c == '$') {
c++;
if (*c >= '0' && *c <= '9') {
/* $n backreference */
rp.type = REWRITE_PART_CAPTURED;
rp.data.ndx = *c - '0';
g_array_append_val(parts, rp);
c++;
} else {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
} else if (*c == '%') {
c++;
if (*c >= '0' && *c <= '9') {
/* %n backreference */
rp.type = REWRITE_PART_CAPTURED_PREV;
rp.data.ndx = *c - '0';
g_array_append_val(parts, rp);
c++;
} else if (*c == '{') {
/* %{var} */
guint len;
c++;
encoded = FALSE;
if (g_str_has_prefix(c, "enc:")) {
c += sizeof("enc:")-1;
encoded = TRUE;
}
for (len = 0; *c != '\0' && *c != '}'; c++)
len++;
if (*c == '\0') {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
rp.data.cond_lval = li_cond_lvalue_from_string(c-len, len);
if (rp.data.cond_lval == LI_COMP_UNKNOWN) {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
if (len && *c == '}') {
rp.type = encoded ? REWRITE_PART_VAR_ENCODED : REWRITE_PART_VAR;
g_array_append_val(parts, rp);
c++;
} else {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
} else {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
} else {
/* string */
gchar *first = c;
c++;
for (;;) {
if (*c == '\0' || *c == '?' || *c == '$' || *c == '%') {
break;
} else if (*c == '\\') {
c++;
if (*c == '\\' || *c == '?' || *c == '$' || *c == '%') {
c++;
} else {
/* parse error */
rewrite_parts_free(parts);
return NULL;
}
} else {
c++;
}
}
if (NULL != regex) {
GError *err = NULL;
rule->regex = g_regex_new(regex->str, G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &err);
rp.type = REWRITE_PART_STRING;
rp.data.str= g_string_new_len(first, c - first);
g_array_append_val(parts, rp);
if (NULL == rule->regex || NULL != err) {
ERROR(srv, "rewrite: error compiling regex \"%s\": %s", regex->str, NULL != err ? err->message : "unknown error");
g_error_free(err);
goto error;
}
}
return parts;
if (NULL != qs) {
*qs = '?';
}
return TRUE;
error:
if (NULL != rule->querystring) {
li_pattern_free(rule->querystring);
rule->querystring = NULL;
}
if (NULL != rule->path) {
li_pattern_free(rule->path);
rule->path = NULL;
}
if (NULL != rule->regex) {
g_regex_unref(rule->regex);
rule->regex = NULL;
}
if (NULL != qs) {
*qs = '?';
}
return FALSE;
}
static gboolean rewrite_internal(liVRequest *vr, GString *dest_path, GString *dest_query, GRegex *regex, GArray *parts, gboolean raw) {
guint i;
GString *str;
GString str_stack;
static gboolean rewrite_internal(liVRequest *vr, GString *dest_path, GString *dest_query, rewrite_rule *rule) {
gchar *path;
gint start_pos, end_pos;
gboolean encoded;
GString *dest = dest_path;
GMatchInfo *match_info = NULL;
GMatchInfo *prev_match_info = NULL;
if (raw)
path = vr->request.uri.raw_path->str;
else
path = vr->request.uri.path->str;
path = vr->request.uri.path->str;
if (regex && !g_regex_match(regex, path, 0, &match_info)) {
if (match_info)
if (NULL != rule->regex && !g_regex_match(rule->regex, path, 0, &match_info)) {
if (NULL != match_info) {
g_match_info_free(match_info);
}
return FALSE;
}
g_string_truncate(dest_path, 0);
g_string_truncate(dest_query, 0);
if (!parts->len) {
if (match_info)
g_match_info_free(match_info);
return TRUE;
if (vr->action_stack.regex_stack->len) {
GArray *rs = vr->action_stack.regex_stack;
prev_match_info = g_array_index(rs, liActionRegexStackElement, rs->len - 1).match_info;
}
for (i = 0; i < parts->len; i++) {
rewrite_part *rp = &g_array_index(parts, rewrite_part, i);
encoded = FALSE;
switch (rp->type) {
case REWRITE_PART_STRING: g_string_append_len(dest, GSTR_LEN(rp->data.str)); break;
case REWRITE_PART_CAPTURED:
if (regex && g_match_info_fetch_pos(match_info, rp->data.ndx, &start_pos, &end_pos) && start_pos != -1)
g_string_append_len(dest, path + start_pos, end_pos - start_pos);
break;
case REWRITE_PART_CAPTURED_PREV:
if (vr->action_stack.regex_stack->len) {
GArray *rs = vr->action_stack.regex_stack;
liActionRegexStackElement *arse = &g_array_index(rs, liActionRegexStackElement, rs->len - 1);
if (arse->string && g_match_info_fetch_pos(arse->match_info, rp->data.ndx, &start_pos, &end_pos) && start_pos != -1)
g_string_append_len(dest, arse->string->str + start_pos, end_pos - start_pos);
}
break;
case REWRITE_PART_VAR_ENCODED:
encoded = TRUE;
/* fall through */
case REWRITE_PART_VAR:
switch (rp->data.cond_lval) {
case LI_COMP_REQUEST_LOCALIP: str = vr->coninfo->local_addr_str; break;
case LI_COMP_REQUEST_REMOTEIP: str = vr->coninfo->remote_addr_str; break;
case LI_COMP_REQUEST_SCHEME:
if (vr->coninfo->is_ssl)
str_stack = li_const_gstring(CONST_STR_LEN("https"));
else
str_stack = li_const_gstring(CONST_STR_LEN("http"));
str = &str_stack;
break;
case LI_COMP_REQUEST_PATH: str = vr->request.uri.path; break;
case LI_COMP_REQUEST_HOST: str = vr->request.uri.host; break;
case LI_COMP_REQUEST_QUERY_STRING: str = vr->request.uri.query; break;
case LI_COMP_REQUEST_METHOD: str = vr->request.http_method_str; break;
case LI_COMP_REQUEST_CONTENT_LENGTH:
g_string_printf(vr->wrk->tmp_str, "%"L_GOFFSET_FORMAT, vr->request.content_length);
str = vr->wrk->tmp_str;
break;
default: continue;
}
if (encoded)
li_string_encode_append(str->str, dest, LI_ENCODING_URI);
else
g_string_append_len(dest, GSTR_LEN(str));
g_string_truncate(dest_path, 0);
g_string_truncate(dest_query, 0);
break;
case REWRITE_PART_QUERYSTRING:
dest = dest_query;
break;
}
li_pattern_eval(vr, dest_path, rule->path, li_pattern_regex_cb, match_info, li_pattern_regex_cb, prev_match_info);
if (NULL != rule->querystring) {
li_pattern_eval(vr, dest_query, rule->querystring, li_pattern_regex_cb, match_info, li_pattern_regex_cb, prev_match_info);
}
g_match_info_free(match_info);
@ -329,25 +189,28 @@ static liHandlerResult rewrite(liVRequest *vr, gpointer param, gpointer *context
UNUSED(context);
for (i = 0; i < rd->rules->len; i++) {
GString *dest_path = vr->wrk->tmp_str;
GString *dest_query = g_ptr_array_index(rpd->tmp_strings, vr->wrk->ndx);
rule = &g_array_index(rd->rules, rewrite_rule, i);
if (rewrite_internal(vr, vr->wrk->tmp_str, g_ptr_array_index(rpd->tmp_strings, vr->wrk->ndx), rule->regex, rule->parts, FALSE)) {
if (rewrite_internal(vr, dest_path, dest_query, rule)) {
/* regex matched */
if (debug) {
VR_DEBUG(vr, "rewrite: path \"%s\" => \"%s\", query \"%s\" => \"%s\"",
vr->request.uri.path->str, vr->wrk->tmp_str->str,
vr->request.uri.query->str, ((GString*)g_ptr_array_index(rpd->tmp_strings, vr->wrk->ndx))->str
vr->request.uri.path->str, dest_path->str,
vr->request.uri.query->str, dest_query->str
);
}
/* change request path */
g_string_truncate(vr->request.uri.path, 0);
g_string_append_len(vr->request.uri.path, GSTR_LEN(vr->wrk->tmp_str));
g_string_append_len(vr->request.uri.path, GSTR_LEN(dest_path));
/* change request query */
if (rule->has_querystring) {
if (NULL != rule->querystring) {
g_string_truncate(vr->request.uri.query, 0);
g_string_append_len(vr->request.uri.query, GSTR_LEN((GString*)g_ptr_array_index(rpd->tmp_strings, vr->wrk->ndx)));
g_string_append_len(vr->request.uri.query, GSTR_LEN(dest_query));
}
/* stop at first matching regex */
@ -367,10 +230,12 @@ static void rewrite_free(liServer *srv, gpointer param) {
for (i = 0; i < rd->rules->len; i++) {
rewrite_rule *rule = &g_array_index(rd->rules, rewrite_rule, i);
rewrite_parts_free(rule->parts);
li_pattern_free(rule->path);
li_pattern_free(rule->querystring);
if (rule->regex)
if (rule->regex) {
g_regex_unref(rule->regex);
}
}
g_array_free(rd->rules, TRUE);
@ -382,9 +247,7 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
liValue *v;
guint i;
rewrite_data *rd;
rewrite_rule rule;
rewrite_plugin_data *rpd = p->data;
GError *err = NULL;
UNUSED(wrk);
UNUSED(userdata);
@ -408,11 +271,9 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
if (val->type == LI_VALUE_STRING) {
/* rewrite "/foo/bar"; */
rule.has_querystring = FALSE;
rule.parts = rewrite_parts_parse(val->data.string, &rule.has_querystring);
rule.regex = NULL;
rewrite_rule rule = { NULL, NULL, NULL };
if (!rule.parts) {
if (!rewrite_rule_parse(srv, NULL, val->data.string, &rule)) {
rewrite_free(NULL, rd);
ERROR(srv, "rewrite: error parsing rule \"%s\"", val->data.string->str);
return NULL;
@ -421,22 +282,10 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
g_array_append_val(rd->rules, rule);
} else if (arr->len == 2 && g_array_index(arr, liValue*, 0)->type == LI_VALUE_STRING && g_array_index(arr, liValue*, 1)->type == LI_VALUE_STRING) {
/* only one rule */
rule.has_querystring = FALSE;
rule.parts = rewrite_parts_parse(g_array_index(arr, liValue*, 1)->data.string, &rule.has_querystring);
if (!rule.parts) {
rewrite_free(NULL, rd);
ERROR(srv, "rewrite: error parsing rule \"%s\"", g_array_index(arr, liValue*, 1)->data.string->str);
return NULL;
}
rule.regex = g_regex_new(g_array_index(arr, liValue*, 0)->data.string->str, G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &err);
rewrite_rule rule = { NULL, NULL, NULL };
if (!rule.regex || err) {
if (!rewrite_rule_parse(srv, g_array_index(arr, liValue*, 0)->data.string, g_array_index(arr, liValue*, 1)->data.string, &rule)) {
rewrite_free(NULL, rd);
rewrite_parts_free(rule.parts);
ERROR(srv, "rewrite: error compiling regex \"%s\": %s", g_array_index(arr, liValue*, 0)->data.string->str, err->message);
g_error_free(err);
return NULL;
}
@ -444,6 +293,7 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
} else {
/* probably multiple rules */
for (i = 0; i < arr->len; i++) {
rewrite_rule rule = { NULL, NULL, NULL };
v = g_array_index(arr, liValue*, i);
if (v->type != LI_VALUE_LIST || v->data.list->len != 2 ||
@ -454,22 +304,9 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
return NULL;
}
rule.has_querystring = FALSE;
rule.parts = rewrite_parts_parse(g_array_index(v->data.list, liValue*, 1)->data.string, &rule.has_querystring);
if (!rule.parts) {
if (!rewrite_rule_parse(srv, g_array_index(v->data.list, liValue*, 0)->data.string, g_array_index(v->data.list, liValue*, 1)->data.string, &rule)) {
rewrite_free(NULL, rd);
ERROR(srv, "rewrite: error parsing rule \"%s\"", g_array_index(v->data.list, liValue*, 1)->data.string->str);
return NULL;
}
rule.regex = g_regex_new(g_array_index(v->data.list, liValue*, 0)->data.string->str, G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &err);
if (!rule.regex || err) {
rewrite_free(NULL, rd);
rewrite_parts_free(rule.parts);
ERROR(srv, "rewrite: error compiling regex \"%s\": %s", g_array_index(v->data.list, liValue*, 0)->data.string->str, err->message);
g_error_free(err);
return NULL;
}
@ -477,7 +314,6 @@ static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liVal
}
}
return li_action_new_function(rewrite, NULL, rewrite_free, rd);
}

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