ProxyConfigService for Linux.

Establishes a ProxyConfig by reading settings from gconf or consulting
environment variables.

BUG=8143

Thanks to ermilov.maxim@gmail.com for his contribution: some ideas<
and code snippets from his patch were folded into this one.
(See http://codereview.chromium.org/49009)

Review URL: http://codereview.chromium.org/60009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14034 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 108 insertions, 0 deletions

diff --git a/net/proxy/proxy_config_service_linux.h b/net/proxy/proxy_config_service_linux.h
new file mode 100644
index 0000000..51436af
--- /dev/null
+++ b/net/proxy/proxy_config_service_linux.h
@@ -0,0 +1,108 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_
+#define NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "net/proxy/proxy_config_service.h"
+#include "net/proxy/proxy_server.h"
+
+namespace net {
+
+// Implementation of ProxyConfigService that retrieves the system proxy
+// settings from environment variables or gconf.
+class ProxyConfigServiceLinux : public ProxyConfigService {
+ public:
+
+  // These are used to derive mocks for unittests.
+  class EnvironmentVariableGetter {
+   public:
+    virtual ~EnvironmentVariableGetter() {}
+    // Gets an environment variable's value and stores it in
+    // result. Returns false if the key is unset.
+    virtual bool Getenv(const char* variable_name, std::string* result) = 0;
+  };
+
+  class GConfSettingGetter {
+   public:
+    virtual ~GConfSettingGetter() {}
+
+    // GDK/GTK+ thread-safety: multi-threaded programs coordinate
+    // around a global lock. See
+    // http://library.gnome.org/devel/gdk/unstable/gdk-Threads.html
+    // and http://research.operationaldynamics.com/blogs/andrew/software/gnome-desktop/gtk-thread-awareness.html
+    // The following methods are used to grab said lock around any
+    // actual gconf usage: including calls to Init() and any of the
+    // Get* methods.
+    virtual void Enter() = 0;
+    virtual void Leave() = 0;
+
+    // Initializes the class: obtains a gconf client, in the concrete
+    // implementation. Returns true on success. Must be called before
+    // any of the Get* methods, and the Get* methods must not be used
+    // if this method returns false. This method may be called again,
+    // whether or not it succeeded before.
+    virtual bool InitIfNeeded() = 0;
+
+    // Gets a string type value from gconf and stores it in result. Returns
+    // false if the key is unset or on error.
+    virtual bool GetString(const char* key, std::string* result) = 0;
+    // Same thing for a bool typed value.
+    virtual bool GetBoolean(const char* key, bool* result) = 0;
+    // Same for an int typed value.
+    virtual bool GetInt(const char* key, int* result) = 0;
+    // And for a string list.
+    virtual bool GetStringList(const char* key,
+                               std::vector<std::string>* result) = 0;
+  };
+
+  // Usual constructor
+  ProxyConfigServiceLinux();
+  // For testing: pass in alternate gconf and env var getter implementations.
+  // ProxyConfigServiceLinux takes ownership of the getter objects.
+  ProxyConfigServiceLinux(EnvironmentVariableGetter* env_var_getter,
+                          GConfSettingGetter* gconf_getter);
+
+  // ProxyConfigService methods:
+  virtual int GetProxyConfig(ProxyConfig* config);
+
+ private:
+  // Obtains an environment variable's value. Parses a proxy server
+  // specification from it and puts it in result. Returns true if the
+  // requested variable is defined and the value valid.
+  bool GetProxyFromEnvVarForScheme(const char* variable,
+                                   ProxyServer::Scheme scheme,
+                                   ProxyServer* result_server);
+  // As above but with scheme set to HTTP, for convenience.
+  bool GetProxyFromEnvVar(const char* variable, ProxyServer* result_server);
+  // Parses entries from the value of the no_proxy env var, and stuffs
+  // them into config->proxy_bypass.
+  void ParseNoProxyList(const std::string& no_proxy, ProxyConfig* config);
+  // Fills proxy config from environment variables. Returns true if
+  // variables were found and the configuration is valid.
+  bool GetConfigFromEnv(ProxyConfig* config);
+
+  // Obtains host and port gconf settings and parses a proxy server
+  // specification from it and puts it in result. Returns true if the
+  // requested variable is defined and the value valid.
+  bool GetProxyFromGConf(const char* key_prefix, bool is_socks,
+                         ProxyServer* result_server);
+  // Fills proxy config from gconf. Returns true if settings were found
+  // and the configuration is valid.
+  bool GetConfigFromGConf(ProxyConfig* config);
+
+  scoped_ptr<EnvironmentVariableGetter> env_var_getter_;
+  scoped_ptr<GConfSettingGetter> gconf_getter_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProxyConfigServiceLinux);
+};
+
+}  // namespace net
+
+#endif  // NET_PROXY_PROXY_CONFIG_SERVICE_LINUX_H_