Adding functionality to specify TLS encryption CUPS print servers for cloudprint connector.

chrome/service/cloud_print/print_system_cups.cc

Index: chrome/service/cloud_print/print_system_cups.cc
===================================================================
--- chrome/service/cloud_print/print_system_cups.cc	(revision 137176)
+++ chrome/service/cloud_print/print_system_cups.cc	(working copy)
@@ -133,9 +133,11 @@
   // <functions>2()  are called when print server is specified, and plain
   // version in another case. There is an issue specifing CUPS_HTTP_DEFAULT
   // in the <functions>2(), it does not work in CUPS prior to 1.4.
-  int GetJobs(cups_job_t** jobs, const GURL& url, const char* name,
+  int GetJobs(cups_job_t** jobs, const GURL& url,
+              http_encryption_t encryption, const char* name,
               int myjobs, int whichjobs);
-  int PrintFile(const GURL& url, const char* name, const char* filename,
+  int PrintFile(const GURL& url, http_encryption_t encryption,
+                const char* name, const char* filename,
                 const char* title, int num_options, cups_option_t* options);

[Ryan Sleevi, 2012/05/17 00:35:27]

nit: these too

 
   void InitPrintBackends(const DictionaryValue* print_system_settings);
@@ -166,6 +168,7 @@
   bool initialized_;
   bool printer_enum_succeeded_;
   bool notify_delete_;
+  http_encryption_t cups_encryption_;
 };
 
 class PrintServerWatcherCUPS
@@ -406,12 +409,18 @@
         kCheckForPrinterUpdatesMinutes)),
       initialized_(false),
       printer_enum_succeeded_(false),
-      notify_delete_(true) {
+      notify_delete_(true),
+      cups_encryption_(HTTP_ENCRYPT_NEVER) {
   if (print_system_settings) {
     int timeout;
     if (print_system_settings->GetInteger(kCUPSUpdateTimeoutMs, &timeout))
       update_timeout_ = base::TimeDelta::FromMilliseconds(timeout);
 
+    int encryption;
+    if (print_system_settings->GetInteger(kCUPSEncryption, &encryption))
+      cups_encryption_ =
+          static_cast<http_encryption_t>(encryption);
+
     bool notify_delete = true;
     if (print_system_settings->GetBoolean(kCUPSNotifyDelete, &notify_delete))
       notify_delete_ = notify_delete;
@@ -448,6 +457,9 @@
   // Make CUPS requests non-blocking.
   backend_settings.SetString(kCUPSBlocking, kValueFalse);
 
+  // Set encryption for backend.
+  backend_settings.SetInteger(kCUPSEncryption, cups_encryption_);
+
   PrintServerInfoCUPS print_server;
   print_server.backend =
     printing::PrintBackend::CreateInstance(&backend_settings);
@@ -590,7 +602,7 @@
   child_process_logging::ScopedPrinterInfoSetter prn_info(
       server_info->backend->GetPrinterDriverInfo(short_printer_name));
   cups_job_t* jobs = NULL;
-  int num_jobs = GetJobs(&jobs, server_info->url,
+  int num_jobs = GetJobs(&jobs, server_info->url, cups_encryption_,
                          short_printer_name.c_str(), 1, -1);
   bool error = (num_jobs == 0) && (cupsLastError() > IPP_OK_EVENTS_COMPLETE);
   if (error) {
@@ -713,13 +725,14 @@
   return new PrintSystemCUPS(print_system_settings);
 }
 
-int PrintSystemCUPS::PrintFile(const GURL& url, const char* name,
-                               const char* filename, const char* title,
-                               int num_options, cups_option_t* options) {
+int PrintSystemCUPS::PrintFile(const GURL& url, http_encryption_t encryption,
+                               const char* name, const char* filename,
+                               const char* title, int num_options,
+                               cups_option_t* options) {
   if (url.is_empty()) {  // Use default (local) print server.
     return cupsPrintFile(name, filename, title, num_options, options);
   } else {
-    printing::HttpConnectionCUPS http(url);
+    printing::HttpConnectionCUPS http(url, encryption);
     http.SetBlocking(false);
     return cupsPrintFile2(http.http(), name, filename,
                           title, num_options, options);
@@ -727,11 +740,12 @@
 }
 
 int PrintSystemCUPS::GetJobs(cups_job_t** jobs, const GURL& url,
+                             http_encryption_t encryption,
                              const char* name, int myjobs, int whichjobs) {
   if (url.is_empty()) {  // Use default (local) print server.
     return cupsGetJobs(jobs, name, myjobs, whichjobs);
   } else {
-    printing::HttpConnectionCUPS http(url);
+    printing::HttpConnectionCUPS http(url, encryption);
     http.SetBlocking(false);
     return cupsGetJobs2(http.http(), jobs, name, myjobs, whichjobs);
   }
@@ -782,6 +796,7 @@
   }
 
   int job_id = PrintFile(server_info->url,
+                         cups_encryption_,
                          short_printer_name.c_str(),
                          print_data_file_path.value().c_str(),
                          job_title.c_str(),