MINOR: http: implement http_get_scheme
This method can be used to retrieve the scheme part of an uri, with the
suffix '://'. It will be useful to implement scheme-based normalization.
(cherry picked from commit ef08811240fb117b6a8072c346f7136e7dd65220)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/http.c b/src/http.c
index 689069c..aff27f1 100644
--- a/src/http.c
+++ b/src/http.c
@@ -468,6 +468,56 @@
}
}
+/* Parse the uri and looks for the scheme. If not found, an empty ist is
+ * returned. Otherwise, the ist pointing to the scheme is returned.
+ */
+struct ist http_get_scheme(const struct ist uri)
+{
+ const char *ptr, *start, *end;
+
+ if (!uri.len)
+ goto not_found;
+
+ ptr = uri.ptr;
+ start = ptr;
+ end = ptr + uri.len;
+
+ /* RFC7230, par. 2.7 :
+ * Request-URI = "*" | absuri | abspath | authority
+ */
+
+ if (*ptr == '*' || *ptr == '/')
+ goto not_found;
+
+ if (isalpha((unsigned char)*ptr)) {
+ /* this is a scheme as described by RFC3986, par. 3.1, or only
+ * an authority (in case of a CONNECT method).
+ */
+ ptr++;
+ /* retrieve the scheme up to the suffix '://'. If the suffix is
+ * not found, this means there is no scheme and it is an
+ * authority-only uri.
+ */
+ while (ptr < end &&
+ (isalnum((unsigned char)*ptr) || *ptr == '+' || *ptr == '-' || *ptr == '.'))
+ ptr++;
+ if (ptr == end || *ptr++ != ':')
+ goto not_found;
+ if (ptr == end || *ptr++ != '/')
+ goto not_found;
+ if (ptr == end || *ptr++ != '/')
+ goto not_found;
+ }
+ else {
+ goto not_found;
+ }
+
+ return ist2(start, ptr - start);
+
+ not_found:
+ return IST_NULL;
+}
+
/* Parse the uri and looks for the authority, between the scheme and the
* path. if no_userinfo is not zero, the part before the '@' (including it) is
* skipped. If not found, an empty ist is returned. Otherwise, the ist pointing