mod_webapp WebAppAlias directive

[Jean-Luc Drouot <jl...@lussy.net>]

I was looking for a way to map a single servlet context on different 
URIs (so as to be able to use relative URLs in the HTML outputs - for 
internationalization and customization purposes).

I finally made a patch on mod_webapp (Apache-1.3) that adds the 
directive WebAppAlias (Usage: WebAppAlias <uri-dest> <uri-alias>).

My httpd.conf now looks like:

     [.../...]
     WebAppConnection warpConnection warp localhost:8008
     WebAppDeploy . warpConnection /servlet/
     WebAppAlias /servlet/ /neostyle/us/servlet/
     WebAppAlias /servlet/ /oldstyle/fr/servlet/
     [.../...]


The request [http://<MYSERVER>/oldstyle/fr/servlet/HelloWorld] is then 
totally equivalent to [http://<MYSERVER>/servlet/HelloWorld], since I 
replace [/oldstyle/fr/servlet/] by [/servlet/] in wam_match method.


In case it is usefull to s.o., here is the patch I made:



Index: webapp/apache-1.3/mod_webapp.c
===================================================================
RCS file: 
/home/cvspublic/jakarta-tomcat-connectors/webapp/apache-1.3/mod_webapp.c,v
retrieving revision 1.29
diff -u -r1.29 mod_webapp.c
--- webapp/apache-1.3/mod_webapp.c	1 Nov 2001 22:20:51 -0000	1.29
+++ webapp/apache-1.3/mod_webapp.c	29 Dec 2001 01:46:25 -0000
@@ -69,6 +69,15 @@
  #include <util_script.h>
  #include <wa.h>

+
+typedef struct wa_aliases wa_aliases;
+struct wa_aliases {
+    const char *dest;
+    const char *alias;
+    /** The pointer to the next aliases structure or <b>NULL</b>. */
+    wa_aliases *next;
+};
+
  /* 
************************************************************************* */
  /* GENERIC DECLARATIONS 
        */
  /* 
************************************************************************* */
@@ -81,6 +90,8 @@
  static wa_chain *wam_connections=NULL;
  /* The main server using for logging error not related to requests */
  static server_rec *server=NULL;
+/* Aliases (JLD) */
+static wa_aliases *wam_aliases=NULL;

  /* 
************************************************************************* */
  /* MODULE AND LIBRARY INITIALIZATION AND DESTRUCTION 
        */
@@ -177,6 +188,22 @@
      return(NULL);
  }

+/* Process the WebAppAlias directive */
+static const char *wam_directive_alias(cmd_parms *cmd, void *mconfig,
+                                      const char *dest, const char 
*alias) {
+    wa_aliases *elem=NULL;
+
+    if (dest==NULL) return("Invalid alias destination");
+    if (alias==NULL) return("Invalid alias name");
+
+    elem=apr_palloc(wa_pool,sizeof(wa_aliases));
+    elem->dest=apr_pstrdup(wa_pool,dest);
+    elem->alias=apr_pstrdup(wa_pool,alias);
+    elem->next=wam_aliases;
+    wam_aliases=elem;
+    return(NULL);
+}
+
  /* Process the WebAppDeploy directive */
  static const char *wam_directive_deploy(cmd_parms *cmd, void *mconfig,
                                        char *name, char *cnam, char 
*path) {
@@ -250,6 +277,13 @@
          RSRC_CONF,                  /* where available */
          TAKE3,                      /* arguments */
          "<name> <connection> <uri-path>"
+    }, {
+        "WebAppAlias",              /* directive name */
+        wam_directive_alias,        /* config action routine */
+        NULL,                       /* argument to include in call */
+        RSRC_CONF,                  /* where available */
+        TAKE2,                      /* arguments */
+        "<uri-dest> <uri-alias>"
      }, {NULL}

  };
@@ -386,6 +420,8 @@
      wa_virtualhost *host=NULL;
      wa_application *appl=NULL;
      wa_chain *elem=NULL;
+    wa_aliases *alias=NULL;
+    char *newuri=NULL;

      /* Paranoid check */
      if (!wam_initialized) return(DECLINED);
@@ -399,6 +435,20 @@
      while(elem!=NULL) {
          appl=(wa_application *)elem->curr;
          if (strncmp(appl->rpth,r->uri,strlen(appl->rpth))==0) break;
+        // Check the aliases (JLD)
+        alias=wam_aliases;
+        while(alias!=NULL) {
+            if ((strcmp(alias->dest,appl->rpth)==0) &&
+                (strncmp(alias->alias,r->uri,strlen(alias->alias))==0)) {
+                newuri=ap_palloc(r->pool, strlen(appl->rpth) + 
strlen(r->uri) - strlen(alias->alias));
+                strcpy(newuri, appl->rpth);
+                strcat(newuri, r->uri + strlen(alias->alias));
+                r->uri=newuri;
+                break;
+            }
+            alias=alias->next;
+        }
+        if (newuri!=NULL) break;

          appl=NULL;
          elem=elem->next;




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