Now all modules are in core modules folder

modules/search_restrict/search_restrict_apache_solr/README.txt

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+********************************************************************
+                     D R U P A L    M O D U L E
+********************************************************************
+Name: Search Restrict Apache Solr
+Author: Robert Castelo <www.codepositive.com>
+Drupal: 6.x
+********************************************************************
+DESCRIPTION:
+
+Restrict by role who can search for each content type when Apache Solr is being used.
+
+
+
+********************************************************************
+PREREQUISITES:
+
+Apache Solr Integration module (Drupal core).
+
+
+
+********************************************************************
+INSTALLATION:
+
+Note: It is assumed that you have Drupal up and running.  Be sure to
+check the Drupal web site if you need assistance.  If you run into
+problems, you should always read the INSTALL.txt that comes with the
+Drupal package and read the online documentation.
+
+1. Place the entire module directory into your Drupal directory:
+   sites/all/modules/
+   
+
+2. Enable the module modules by navigating to:
+
+   administer > build > modules
+     
+  Click the 'Save configuration' button at the bottom to commit your
+  changes. 
+
+
+
+********************************************************************
+USAGE:
+
+On the configuration form of each each content type set the role(s)
+that can search for nodes of that content type.
+
+
+********************************************************************
+TO DO
+
+Write tests
+
+
+********************************************************************
+ACKNOWLEDGEMENT
+
+
+
+

modules/search_restrict/search_restrict_apache_solr/search_restrict_apache_solr.info

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+name = Search Restrict Apache Solr
+description =  "Exclude specific content from Apache Solr search results if user doesn't have privileges."
+package = Core - extended
+dependencies[] = apachesolr
+dependencies[] = search_restrict
+core = 6.x
+
+; Information added by drupal.org packaging script on 2012-08-29
+version = "6.x-1.5"
+core = "6.x"
+project = "search_restrict"
+datestamp = "1346261003"

modules/search_restrict/search_restrict_apache_solr/search_restrict_apache_solr.module

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+<?php
+
+/**
+ * Implementation of hook_apachesolr_modify_query()
+ */
+function search_restrict_apache_solr_apachesolr_modify_query(&$query, &$params, $caller) {
+  global $user;
+  // User 1 can search everything.
+  if ($user->uid == 1) {
+    return;
+  }
+
+  $excluded_types = search_restrict_apache_solr_excluded($user->roles);
+	
+  if (!empty($excluded_types)) {
+
+    foreach ($excluded_types as $excluded_type) {
+      $query->add_filter('type', $excluded_type, TRUE);
+    }
+  }
+
+}
+
+/**
+ * Get list of content types to exclude.
+ */
+function search_restrict_apache_solr_excluded($user_roles) {
+
+  $excluded_types = array();
+  $types = node_get_types();
+
+  foreach ($types as $type => $type_info) {
+    $roles = variable_get('search_restrict_type_'. $type, array());
+    $access = FALSE;
+    $access_false = array();
+    $access_true = array();
+
+    // list included and excluded roles
+    foreach ($roles as $role_id => $selected) {
+      if (empty($selected)) { 
+        $access_false[] = $role_id;
+      }
+      else {
+        $access_true[] = $role_id;  
+      } 
+    }
+
+    // If no roles or all roles have been selected then everyone has access
+    // skip this content type.
+    if (!empty($access_true) && !empty($access_false)) {
+      // If user has role in include list skip this content type.
+      foreach ($access_true as $role_selected) {
+        if (!empty($user_roles[$role_selected])) $access = TRUE;
+      } 
+    
+      // User doesn't have any roles that are allowed to search this content type.
+      if (empty($access)) $excluded_types[] =  $type; 
+    }
+	}
+	
+	return $excluded_types;	
+}