text: /*
   * Copyright 2012 Google Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  // Author: jefftk@google.com (Jeff Kaufman)
  
  #ifndef NET_INSTAWEB_REWRITER_PUBLIC_FILE_LOAD_RULE_H_
  #define NET_INSTAWEB_REWRITER_PUBLIC_FILE_LOAD_RULE_H_
  
  #include "net/instaweb/util/public/manually_ref_counted.h"
  #include "net/instaweb/util/public/basictypes.h"
  #include "net/instaweb/util/public/re2.h"
  #include "net/instaweb/util/public/string.h"
  
  namespace net_instaweb {
  
  // Class for storing information about what filesystem paths are appropriate for
  // direct access and which need to be fetched through HTTP loopback.
  class FileLoadRule : public ManuallyRefCounted {
   public:
    enum Classification {
      kAllowed,
      kDisallowed,
      kUnmatched,
    };
  
    virtual ~FileLoadRule();
    explicit FileLoadRule(bool allowed) : allowed_(allowed) {}
  
    // What does this rule say about this filename?
    Classification Classify(const GoogleString& filename) const;
  
   protected:
    // Is does this rule apply to this filename?
    virtual bool Match(const GoogleString& filename) const = 0;
    const bool allowed_;
  };
  
  class FileLoadRuleRegexp : public FileLoadRule {
   public:
    virtual ~FileLoadRuleRegexp();
  
    // If allowed is true, whitelist filenames matching filename_regexp.
    // Otherwise blacklist them.
    FileLoadRuleRegexp(const GoogleString& filename_regexp, bool allowed)
        : FileLoadRule(allowed),
          filename_regexp_(filename_regexp),
          filename_regexp_str_(filename_regexp)
    {}
  
    virtual bool Match(const GoogleString& filename) const;
  
   private:
    const RE2 filename_regexp_;
    // RE2s can't be copied, so we need to keep the string around.
    const GoogleString filename_regexp_str_;
  
    DISALLOW_COPY_AND_ASSIGN(FileLoadRuleRegexp);
  };
  
  class FileLoadRuleLiteral : public FileLoadRule {
   public:
    virtual ~FileLoadRuleLiteral();
  
    // If allowed is true, whitelist filenames starting with filename_prefix.
    // Otherwise blacklist them.
    FileLoadRuleLiteral(const GoogleString& filename_prefix, bool allowed)
        : FileLoadRule(allowed), filename_prefix_(filename_prefix)
    {}
  
    virtual bool Match(const GoogleString& filename) const;
  
   private:
    const GoogleString filename_prefix_;
  
    DISALLOW_COPY_AND_ASSIGN(FileLoadRuleLiteral);
  };
  
  }  // namespace net_instaweb
  
  #endif  // NET_INSTAWEB_REWRITER_PUBLIC_FILE_LOAD_RULE_H_
  