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From Sung Kim <hun...@cse.ucsc.edu>
Subject [PATCH] mod_dav patch for DASL(SEARCH) support.
Date Fri, 05 Apr 2002 06:41:20 GMT
Hello,

This mod_dav patch has search_hook interface
and a basic search_method for supporting DASL(SEARCH method).

It was compiled and tested with Apache/2.0.35-dev in Linux 2.4.9(i686).

Index: fs/repos.c
===================================================================
RCS file: /home/cvspublic/httpd-2.0/modules/dav/fs/repos.c,v
retrieving revision 1.68
diff -u -r1.68 repos.c
--- fs/repos.c	29 Mar 2002 08:17:20 -0000	1.68
+++ fs/repos.c	5 Apr 2002 03:56:57 -0000
@@ -2097,7 +2097,8 @@
     &dav_hooks_db_dbm,
     &dav_hooks_locks_fs,
     NULL,               /* vsn */
-    NULL                /* binding */
+    NULL,               /* binding */
+    NULL                /* search */
 };

 void dav_fs_gather_propsets(apr_array_header_t *uris)
Index: main/mod_dav.c
===================================================================
RCS file: /home/cvspublic/httpd-2.0/modules/dav/main/mod_dav.c,v
retrieving revision 1.77
diff -u -r1.77 mod_dav.c
--- main/mod_dav.c	20 Mar 2002 17:41:54 -0000	1.77
+++ main/mod_dav.c	5 Apr 2002 03:56:57 -0000
@@ -133,6 +133,7 @@
 /* DAV methods */
 enum {
     DAV_M_BIND = 0,
+    DAV_M_SEARCH,
     DAV_M_LAST
 };
 static int dav_methods[DAV_M_LAST];
@@ -145,6 +146,7 @@

     /* Register DAV methods */
     dav_methods[DAV_M_BIND] = ap_method_register(p, "BIND");
+    dav_methods[DAV_M_SEARCH] = ap_method_register(p, "SEARCH");

     ap_add_version_component(p, "DAV/2");

@@ -265,6 +267,11 @@
     return dav_get_provider(r)->binding;
 }

+const dav_hooks_search *dav_get_search_hooks(request_rec *r)
+{
+    return dav_get_provider(r)->search;
+}
+
 /*
  * Command handler for the DAV directive, which is TAKE1.
  */
@@ -1427,12 +1434,69 @@
     return NULL;
 }

+
+/* handle the SEARCH method */
+static int dav_method_search(request_rec *r)
+{
+    const dav_hooks_search *search_hooks = DAV_GET_HOOKS_SEARCH(r);
+    dav_resource *resource;
+    dav_error *err;
+    dav_response *multi_status;
+
+    /* If no search provider, decline the request */
+    if (search_hooks == NULL)
+        return DECLINED;
+
+    /* This method should only be called when the resource is not
+     * visible to Apache. We will fetch the resource from the repository,
+     * then create a subrequest for Apache to handle.
+     */
+    err = dav_get_resource(r, 1 /* label_allowed */, 0 /* use_checked_in */,
+                           &resource);
+    if (err != NULL)
+        return dav_handle_err(r, err, NULL);
+
+    if (!resource->exists) {
+        /* Apache will supply a default error for this. */
+        return HTTP_NOT_FOUND;
+    }
+
+    /* set up the HTTP headers for the response */
+    if ((err = (*resource->hooks->set_headers)(r, resource)) != NULL) {
+        err = dav_push_error(r->pool, err->status, 0,
+                             "Unable to set up HTTP headers.",
+                             err);
+        return dav_handle_err(r, err, NULL);
+    }
+
+    if (r->header_only) {
+        return DONE;
+    }
+
+    /* okay... time to search the content */
+    /* Let's validate XML and process walk function
+     * in the hook function
+     */
+    if ((err = (*search_hooks->search_resource)(r, &multi_status))
+	!= NULL) {
+        /* ### add a higher-level description? */
+        return dav_handle_err(r, err, NULL);
+    }
+
+    /* We have results in multi_status */
+    /* Should I pass namespace?? */
+    dav_send_multistatus(r, HTTP_MULTI_STATUS, multi_status, NULL);
+
+    return DONE;
+}
+
 /* handle the OPTIONS method */
 static int dav_method_options(request_rec *r)
 {
     const dav_hooks_locks *locks_hooks = DAV_GET_HOOKS_LOCKS(r);
     const dav_hooks_vsn *vsn_hooks = DAV_GET_HOOKS_VSN(r);
     const dav_hooks_binding *binding_hooks = DAV_GET_HOOKS_BINDING(r);
+    const dav_hooks_search *search_hooks = DAV_GET_HOOKS_SEARCH(r);
     dav_resource *resource;
     const char *dav_level;
     char *allow;
@@ -1617,6 +1681,11 @@
         apr_table_addn(methods, "BIND", "");
     }

+    /* If there is a search provider, set SEARCH in option */
+    if (search_hooks != NULL) {
+	apr_table_addn(methods, "SEARCH", "");
+    }
+
     /* Generate the Allow header */
     arr = apr_table_elts(methods);
     elts = (const apr_table_entry_t *)arr->elts;
@@ -1646,6 +1715,19 @@

     apr_table_setn(r->headers_out, "Allow", allow);

+
+    /* If there is search set_option_head function, set head */
+    /* DASL: <DAV:basicsearch>
+     * DASL: <http://foo.bar.com/syntax1>
+     * DASL: <http://akuma.com/syntax2>
+     */
+    if (search_hooks != NULL &&
+	*search_hooks->set_option_head != NULL) {
+	if ((err = (*search_hooks->set_option_head)(r))!=NULL) {
+	    return dav_handle_err(r, err, NULL);
+	}
+    }
+
     /* if there was no request body, then there is no response body */
     if (doc == NULL) {
         ap_set_content_length(r, 0);
@@ -4511,6 +4593,11 @@

     if (r->method_number == dav_methods[DAV_M_BIND]) {
         return dav_method_bind(r);
+    }
+
+    /* DASL method */
+    if (r->method_number == dav_methods[DAV_M_SEARCH]) {
+        return dav_method_search(r);
     }

     /* ### add'l methods for Advanced Collections, ACLs, DASL */
Index: main/mod_dav.h
===================================================================
RCS file: /home/cvspublic/httpd-2.0/modules/dav/main/mod_dav.h,v
retrieving revision 1.59
diff -u -r1.59 mod_dav.h
--- main/mod_dav.h	18 Mar 2002 22:25:01 -0000	1.59
+++ main/mod_dav.h	5 Apr 2002 03:56:57 -0000
@@ -268,6 +268,7 @@
 typedef struct dav_hooks_repository dav_hooks_repository;
 typedef struct dav_hooks_liveprop dav_hooks_liveprop;
 typedef struct dav_hooks_binding dav_hooks_binding;
+typedef struct dav_hooks_search dav_hooks_search;

 /* ### deprecated name */
 typedef dav_hooks_propdb dav_hooks_db;
@@ -612,7 +613,7 @@
     const dav_hooks_locks *locks;
     const dav_hooks_vsn *vsn;
     const dav_hooks_binding *binding;
-
+    const dav_hooks_search *search;
 } dav_provider;

 /*
@@ -666,6 +667,7 @@
 const dav_hooks_propdb *dav_get_propdb_hooks(request_rec *r);
 const dav_hooks_vsn *dav_get_vsn_hooks(request_rec *r);
 const dav_hooks_binding *dav_get_binding_hooks(request_rec *r);
+const dav_hooks_search *dav_get_search(request_rec *r);

 DAV_DECLARE(void) dav_register_provider(apr_pool_t *p, const char *name,
                                         const dav_provider *hooks);
@@ -677,6 +679,7 @@
 #define DAV_GET_HOOKS_LOCKS(r)          dav_get_lock_hooks(r)
 #define DAV_GET_HOOKS_VSN(r)            dav_get_vsn_hooks(r)
 #define DAV_GET_HOOKS_BINDING(r)        dav_get_binding_hooks(r)
+#define DAV_GET_HOOKS_SEARCH(r)         dav_get_search_hooks(r)


 /* --------------------------------------------------------------------
@@ -2330,6 +2333,38 @@
      */
     dav_error * (*bind_resource)(const dav_resource *resource,
 				 dav_resource *binding);
+
+};
+
+
+/* --------------------------------------------------------------------
+**
+** SEARCH(DASL) FUNCTIONS
+*/
+
+/* search provider hooks */
+struct dav_hooks_search {
+    /* Set header for a OPTION method
+     * An error may be returned.
+     * To set a hadder, this function might call
+     * apr_table_setn(r->headers_out, "DASL", dasl_optin1);
+     *
+     * Examples:
+     * DASL: <DAV:basicsearch>
+     * DASL: <http://foo.bar.com/syntax1>
+     * DASL: <http://akuma.com/syntax2>
+     */
+    dav_error * (*set_option_head)(request_rec *r);
+
+    /* Search resources
+     * An error may be returned. *response will contain multistatus
+     * responses (if any) suitable for the body of the error. It is also
+     * possible to return NULL, yet still have multistatus responses.
+     * In this case, typically the caller should return a 207 (Multistatus)
+     * and the responses (in the body) as the HTTP response.
+     */
+    dav_error * (*search_resource)(request_rec *r,
+				   dav_response **response);

 };



--
Sung Kim <hunkim@cse.ucsc.edu>
http://www.cse.ucsc.edu/~hunkim

 "Dreams become reality!"


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