diff options
Diffstat (limited to 'src/core/ext/client_channel/uri_parser.c')
| -rw-r--r-- | src/core/ext/client_channel/uri_parser.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/src/core/ext/client_channel/uri_parser.c b/src/core/ext/client_channel/uri_parser.c new file mode 100644 index 0000000000..bcb6a1dee4 --- /dev/null +++ b/src/core/ext/client_channel/uri_parser.c @@ -0,0 +1,310 @@ +/* + * + * Copyright 2015, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "src/core/ext/client_channel/uri_parser.h" + +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/port_platform.h> +#include <grpc/support/slice.h> +#include <grpc/support/slice_buffer.h> +#include <grpc/support/string_util.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, + int 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 = 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 \a src[begin, end) */ +static char *copy_component(const char *src, size_t begin, size_t end) { + char *out = gpr_malloc(end - begin + 1); + memcpy(out, src + begin, end - begin); + out[end - begin] = 0; + return out; +} + +/** 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 = "!" / "$" / "&" / "'" / "(" / ")" + / "*" / "+" / "," / ";" / "=" */ + char c = uri_text[i]; + if (((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z')) || + ((c >= '0') && (c <= '9')) || + (c == '-' || c == '.' || c == '_' || c == '~') || /* unreserved */ + (c == '!' || c == '$' || c == '&' || c == '\'' || c == '$' || c == '&' || + c == '(' || c == ')' || c == '*' || c == '+' || c == ',' || c == ';' || + c == '=') /* sub-delims */) { + return 1; + } + if (c == '%') { /* pct-encoded */ + size_t j; + if (uri_text[i + 1] == 0 || uri_text[i + 2] == 0) { + return NOT_SET; + } + for (j = i + 1; j < 2; j++) { + c = uri_text[j]; + if (!(((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) || + ((c >= 'A') && (c <= 'F')))) { + return NOT_SET; + } + } + return 2; + } + 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 do_nothing(void *ignored) {} +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_slice query_slice = + gpr_slice_new(uri->query, strlen(uri->query), do_nothing); + gpr_slice_buffer query_parts; /* the &-separated elements of the query */ + gpr_slice_buffer query_param_parts; /* the =-separated subelements */ + + gpr_slice_buffer_init(&query_parts); + gpr_slice_buffer_init(&query_param_parts); + + gpr_slice_split(query_slice, QUERY_PARTS_SEPARATOR, &query_parts); + uri->query_parts = gpr_malloc(query_parts.count * sizeof(char *)); + uri->query_parts_values = gpr_malloc(query_parts.count * sizeof(char *)); + uri->num_query_parts = query_parts.count; + for (size_t i = 0; i < query_parts.count; i++) { + gpr_slice_split(query_parts.slices[i], QUERY_PARTS_VALUE_SEPARATOR, + &query_param_parts); + GPR_ASSERT(query_param_parts.count > 0); + uri->query_parts[i] = + gpr_dump_slice(query_param_parts.slices[0], GPR_DUMP_ASCII); + if (query_param_parts.count > 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] = + gpr_dump_slice(query_param_parts.slices[1], GPR_DUMP_ASCII); + } else { + uri->query_parts_values[i] = NULL; + } + gpr_slice_buffer_reset_and_unref(&query_param_parts); + } + gpr_slice_buffer_destroy(&query_parts); + gpr_slice_buffer_destroy(&query_param_parts); + gpr_slice_unref(query_slice); +} + +grpc_uri *grpc_uri_parse(const char *uri_text, int 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 = gpr_malloc(sizeof(*uri)); + memset(uri, 0, sizeof(*uri)); + uri->scheme = copy_component(uri_text, scheme_begin, scheme_end); + uri->authority = copy_component(uri_text, authority_begin, authority_end); + uri->path = copy_component(uri_text, path_begin, path_end); + uri->query = copy_component(uri_text, query_begin, query_end); + uri->fragment = copy_component(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); +} |