mod_rewrite, mod_proxy: mod_proxy to cononicalize rewritten [P] URLs.…

… PR 69235.

When mod_rewrite sets a "proxy:" URL with [P], it should be canonicalized by
mod_proxy still, notably to handle any "unix:" local socket part.

To avoid double encoding in perdir context, a follow up commit should remove the
ap_escape_uri() done in mod_rewrite since it's now on mod_proxy to canonicalize,
per PR 69260.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1920570 13f79535-47bb-0310-9956-ffa450edef68
(cherry picked from commit c9dc4bb)

changes-entries/pr69235.txt

@@ -0,0 +1,2 @@
+  *) mod_rewrite, mod_proxy: mod_proxy to cononicalize rewritten [P] URLs,
+     including "unix:" ones.  PR 69235.  [Yann Ylavic]

modules/mappers/mod_rewrite.c

@@ -5658,10 +5658,7 @@ static void ap_register_rewrite_mapfunc(char *name, rewrite_mapfunc_t *func)
 
 static void register_hooks(apr_pool_t *p)
 {
-    /* fixup after mod_proxy, so that the proxied url will not
-     * escaped accidentally by mod_proxy's fixup.
-     */
-    static const char * const aszPre[]={ "mod_proxy.c", NULL };
+    static const char * const aszModProxy[] = { "mod_proxy.c", NULL };
 
     /* make the hashtable before registering the function, so that
      * other modules are prevented from accessing uninitialized memory.
@@ -5673,10 +5670,12 @@ static void register_hooks(apr_pool_t *p)
     ap_hook_pre_config(pre_config, NULL, NULL, APR_HOOK_MIDDLE);
     ap_hook_post_config(post_config, NULL, NULL, APR_HOOK_MIDDLE);
     ap_hook_child_init(init_child, NULL, NULL, APR_HOOK_MIDDLE);
-
-    ap_hook_fixups(hook_fixup, aszPre, NULL, APR_HOOK_FIRST);
+
+    /* allow to change the uri before mod_proxy takes over it */
+    ap_hook_translate_name(hook_uri2file, NULL, aszModProxy, APR_HOOK_FIRST);
+    /* fixup before mod_proxy so that a [P] URL gets fixed up there */
+    ap_hook_fixups(hook_fixup, NULL, aszModProxy, APR_HOOK_FIRST);
     ap_hook_fixups(hook_mimetype, NULL, NULL, APR_HOOK_LAST);
-    ap_hook_translate_name(hook_uri2file, NULL, NULL, APR_HOOK_FIRST);
 }
 
     /* the main config structure */

modules/proxy/mod_proxy.c

@@ -3347,27 +3347,26 @@ static int proxy_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
 }
 static void register_hooks(apr_pool_t *p)
 {
-    /* fixup before mod_rewrite, so that the proxied url will not
-     * escaped accidentally by our fixup.
-     */
-    static const char * const aszSucc[] = { "mod_rewrite.c", NULL};
     /* Only the mpm_winnt has child init hook handler.
      * make sure that we are called after the mpm
      * initializes.
      */
     static const char *const aszPred[] = { "mpm_winnt.c", "mod_proxy_balancer.c",
                                            "mod_proxy_hcheck.c", NULL};
+    static const char * const aszModRewrite[] = { "mod_rewrite.c", NULL };
+
     /* handler */
     ap_hook_handler(proxy_handler, NULL, NULL, APR_HOOK_FIRST);
     /* filename-to-URI translation */
     ap_hook_pre_translate_name(proxy_pre_translate_name, NULL, NULL,
                                APR_HOOK_MIDDLE);
-    ap_hook_translate_name(proxy_translate_name, aszSucc, NULL,
+    /* mod_rewrite has a say on the uri before proxy translation */
+    ap_hook_translate_name(proxy_translate_name, aszModRewrite, NULL,
                            APR_HOOK_FIRST);
     /* walk <Proxy > entries and suppress default TRACE behavior */
     ap_hook_map_to_storage(proxy_map_location, NULL,NULL, APR_HOOK_FIRST);
-    /* fixups */
-    ap_hook_fixups(proxy_fixup, NULL, aszSucc, APR_HOOK_FIRST);
+    /* fixup after mod_rewrite so that a [P] URL from there gets fixed up */
+    ap_hook_fixups(proxy_fixup, aszModRewrite, NULL, APR_HOOK_FIRST);
     /* post read_request handling */
     ap_hook_post_read_request(proxy_detect, NULL, NULL, APR_HOOK_FIRST);
     /* pre config handling */