methods: add link and unlink

LINK and UNLINK are registered methods and are in real world use.

Author: jasnell

http_parser.c

@@ -1000,6 +1000,13 @@ size_t http_parser_execute (http_parser *parser,
           UPDATE_STATE(s_req_spaces_before_url);
         } else if (ch == matcher[parser->index]) {
           ; /* nada */
+        } else if (parser->method == HTTP_LOCK) {
+          if (parser->index == 1 && ch == 'I') {
+            parser->method = HTTP_LINK;
+          } else {
+            SET_ERRNO(HPE_INVALID_METHOD);
+            goto error;
+          }
         } else if (parser->method == HTTP_CONNECT) {
           if (parser->index == 1 && ch == 'H') {
             parser->method = HTTP_CHECKOUT;
@@ -1070,6 +1077,13 @@ size_t http_parser_execute (http_parser *parser,
             SET_ERRNO(HPE_INVALID_METHOD);
             goto error;
           }
+        } else if (parser->method == HTTP_UNLOCK && parser->index == 3) {
+          if (ch == 'I') {
+            parser->method = HTTP_UNLINK;
+          } else {
+            SET_ERRNO(HPE_INVALID_METHOD);
+            goto error;
+          }
         } else if (parser->index == 4 && parser->method == HTTP_PROPFIND && ch == 'P') {
           parser->method = HTTP_PROPPATCH;
         } else {

http_parser.h

@@ -124,6 +124,9 @@ typedef int (*http_cb) (http_parser*);
   XX(29, PURGE,       PURGE)        \
   /* CalDAV */                      \
   XX(30, MKCALENDAR,  MKCALENDAR)   \
+  /* RFC-7237 */                    \
+  XX(31, LINK,        LINK)         \
+  XX(32, UNLINK,      UNLINK)       \
 
 enum http_method
   {