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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/ext/filters/client_channel/uri_parser.h"
#include <string.h>
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/slice/percent_encoding.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/support/string.h"
/** a size_t default value... maps to all 1's */
#define NOT_SET (~(size_t)0)
static grpc_uri* bad_uri(const char* uri_text, size_t pos, const char* section,
bool suppress_errors) {
char* line_prefix;
size_t pfx_len;
if (!suppress_errors) {
gpr_asprintf(&line_prefix, "bad uri.%s: '", section);
pfx_len = strlen(line_prefix) + pos;
gpr_log(GPR_ERROR, "%s%s'", line_prefix, uri_text);
gpr_free(line_prefix);
line_prefix = (char*)gpr_malloc(pfx_len + 1);
memset(line_prefix, ' ', pfx_len);
line_prefix[pfx_len] = 0;
gpr_log(GPR_ERROR, "%s^ here", line_prefix);
gpr_free(line_prefix);
}
return NULL;
}
/** Returns a copy of percent decoded \a src[begin, end) */
static char* decode_and_copy_component(grpc_exec_ctx* exec_ctx, const char* src,
size_t begin, size_t end) {
grpc_slice component =
(begin == NOT_SET || end == NOT_SET)
? grpc_empty_slice()
: grpc_slice_from_copied_buffer(src + begin, end - begin);
grpc_slice decoded_component =
grpc_permissive_percent_decode_slice(component);
char* out = grpc_dump_slice(decoded_component, GPR_DUMP_ASCII);
grpc_slice_unref_internal(exec_ctx, component);
grpc_slice_unref_internal(exec_ctx, decoded_component);
return out;
}
static bool valid_hex(char c) {
return ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F')) ||
((c >= '0') && (c <= '9'));
}
/** Returns how many chars to advance if \a uri_text[i] begins a valid \a pchar
* production. If \a uri_text[i] introduces an invalid \a pchar (such as percent
* sign not followed by two hex digits), NOT_SET is returned. */
static size_t parse_pchar(const char* uri_text, size_t i) {
/* pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
* pct-encoded = "%" HEXDIG HEXDIG
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/ "*" / "+" / "," / ";" / "=" */
char c = uri_text[i];
switch (c) {
default:
if (((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9'))) {
return 1;
}
break;
case ':':
case '@':
case '-':
case '.':
case '_':
case '~':
case '!':
case '$':
case '&':
case '\'':
case '(':
case ')':
case '*':
case '+':
case ',':
case ';':
case '=':
return 1;
case '%': /* pct-encoded */
if (valid_hex(uri_text[i + 1]) && valid_hex(uri_text[i + 2])) {
return 2;
}
return NOT_SET;
}
return 0;
}
/* *( pchar / "?" / "/" ) */
static int parse_fragment_or_query(const char* uri_text, size_t* i) {
char c;
while ((c = uri_text[*i]) != 0) {
const size_t advance = parse_pchar(uri_text, *i); /* pchar */
switch (advance) {
case 0: /* uri_text[i] isn't in pchar */
/* maybe it's ? or / */
if (uri_text[*i] == '?' || uri_text[*i] == '/') {
(*i)++;
break;
} else {
return 1;
}
GPR_UNREACHABLE_CODE(return 0);
default:
(*i) += advance;
break;
case NOT_SET: /* uri_text[i] introduces an invalid URI */
return 0;
}
}
/* *i is the first uri_text position past the \a query production, maybe \0 */
return 1;
}
static void parse_query_parts(grpc_uri* uri) {
static const char* QUERY_PARTS_SEPARATOR = "&";
static const char* QUERY_PARTS_VALUE_SEPARATOR = "=";
GPR_ASSERT(uri->query != NULL);
if (uri->query[0] == '\0') {
uri->query_parts = NULL;
uri->query_parts_values = NULL;
uri->num_query_parts = 0;
return;
}
gpr_string_split(uri->query, QUERY_PARTS_SEPARATOR, &uri->query_parts,
&uri->num_query_parts);
uri->query_parts_values =
(char**)gpr_malloc(uri->num_query_parts * sizeof(char**));
for (size_t i = 0; i < uri->num_query_parts; i++) {
char** query_param_parts;
size_t num_query_param_parts;
char* full = uri->query_parts[i];
gpr_string_split(full, QUERY_PARTS_VALUE_SEPARATOR, &query_param_parts,
&num_query_param_parts);
GPR_ASSERT(num_query_param_parts > 0);
uri->query_parts[i] = query_param_parts[0];
if (num_query_param_parts > 1) {
/* TODO(dgq): only the first value after the separator is considered.
* Perhaps all chars after the first separator for the query part should
* be included, even if they include the separator. */
uri->query_parts_values[i] = query_param_parts[1];
} else {
uri->query_parts_values[i] = NULL;
}
for (size_t j = 2; j < num_query_param_parts; j++) {
gpr_free(query_param_parts[j]);
}
gpr_free(query_param_parts);
gpr_free(full);
}
}
grpc_uri* grpc_uri_parse(grpc_exec_ctx* exec_ctx, const char* uri_text,
bool suppress_errors) {
grpc_uri* uri;
size_t scheme_begin = 0;
size_t scheme_end = NOT_SET;
size_t authority_begin = NOT_SET;
size_t authority_end = NOT_SET;
size_t path_begin = NOT_SET;
size_t path_end = NOT_SET;
size_t query_begin = NOT_SET;
size_t query_end = NOT_SET;
size_t fragment_begin = NOT_SET;
size_t fragment_end = NOT_SET;
size_t i;
for (i = scheme_begin; uri_text[i] != 0; i++) {
if (uri_text[i] == ':') {
scheme_end = i;
break;
}
if (uri_text[i] >= 'a' && uri_text[i] <= 'z') continue;
if (uri_text[i] >= 'A' && uri_text[i] <= 'Z') continue;
if (i != scheme_begin) {
if (uri_text[i] >= '0' && uri_text[i] <= '9') continue;
if (uri_text[i] == '+') continue;
if (uri_text[i] == '-') continue;
if (uri_text[i] == '.') continue;
}
break;
}
if (scheme_end == NOT_SET) {
return bad_uri(uri_text, i, "scheme", suppress_errors);
}
if (uri_text[scheme_end + 1] == '/' && uri_text[scheme_end + 2] == '/') {
authority_begin = scheme_end + 3;
for (i = authority_begin; uri_text[i] != 0 && authority_end == NOT_SET;
i++) {
if (uri_text[i] == '/' || uri_text[i] == '?' || uri_text[i] == '#') {
authority_end = i;
}
}
if (authority_end == NOT_SET && uri_text[i] == 0) {
authority_end = i;
}
if (authority_end == NOT_SET) {
return bad_uri(uri_text, i, "authority", suppress_errors);
}
/* TODO(ctiller): parse the authority correctly */
path_begin = authority_end;
} else {
path_begin = scheme_end + 1;
}
for (i = path_begin; uri_text[i] != 0; i++) {
if (uri_text[i] == '?' || uri_text[i] == '#') {
path_end = i;
break;
}
}
if (path_end == NOT_SET && uri_text[i] == 0) {
path_end = i;
}
if (path_end == NOT_SET) {
return bad_uri(uri_text, i, "path", suppress_errors);
}
if (uri_text[i] == '?') {
query_begin = ++i;
if (!parse_fragment_or_query(uri_text, &i)) {
return bad_uri(uri_text, i, "query", suppress_errors);
} else if (uri_text[i] != 0 && uri_text[i] != '#') {
/* We must be at the end or at the beginning of a fragment */
return bad_uri(uri_text, i, "query", suppress_errors);
}
query_end = i;
}
if (uri_text[i] == '#') {
fragment_begin = ++i;
if (!parse_fragment_or_query(uri_text, &i)) {
return bad_uri(uri_text, i - fragment_end, "fragment", suppress_errors);
} else if (uri_text[i] != 0) {
/* We must be at the end */
return bad_uri(uri_text, i, "fragment", suppress_errors);
}
fragment_end = i;
}
uri = (grpc_uri*)gpr_zalloc(sizeof(*uri));
uri->scheme =
decode_and_copy_component(exec_ctx, uri_text, scheme_begin, scheme_end);
uri->authority = decode_and_copy_component(exec_ctx, uri_text,
authority_begin, authority_end);
uri->path =
decode_and_copy_component(exec_ctx, uri_text, path_begin, path_end);
uri->query =
decode_and_copy_component(exec_ctx, uri_text, query_begin, query_end);
uri->fragment = decode_and_copy_component(exec_ctx, uri_text, fragment_begin,
fragment_end);
parse_query_parts(uri);
return uri;
}
const char* grpc_uri_get_query_arg(const grpc_uri* uri, const char* key) {
GPR_ASSERT(key != NULL);
if (key[0] == '\0') return NULL;
for (size_t i = 0; i < uri->num_query_parts; ++i) {
if (0 == strcmp(key, uri->query_parts[i])) {
return uri->query_parts_values[i];
}
}
return NULL;
}
void grpc_uri_destroy(grpc_uri* uri) {
if (!uri) return;
gpr_free(uri->scheme);
gpr_free(uri->authority);
gpr_free(uri->path);
gpr_free(uri->query);
for (size_t i = 0; i < uri->num_query_parts; ++i) {
gpr_free(uri->query_parts[i]);
gpr_free(uri->query_parts_values[i]);
}
gpr_free(uri->query_parts);
gpr_free(uri->query_parts_values);
gpr_free(uri->fragment);
gpr_free(uri);
}
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