[tbb-commits] [tor-browser] 27/33: fixup! fixup! Bug 40597: Implement TorSettings module

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richard pushed a commit to branch tor-browser-91.9.0esr-11.5-1
in repository tor-browser.

commit 907f3ed2bddd0e7bb6648f667df0178adfe6443c
Author: Pier Angelo Vendrame <pierov at torproject.org>
AuthorDate: Thu Apr 14 18:49:50 2022 +0200

    fixup! fixup! Bug 40597: Implement TorSettings module
    
    Try to use the fallback settings if getting localized settings fails.
---
 browser/modules/Moat.jsm       | 21 +++++++++++++++++++++
 browser/modules/TorConnect.jsm | 24 ++++++++++++++++++------
 2 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/browser/modules/Moat.jsm b/browser/modules/Moat.jsm
index bdcf6cb631561..35931172f3ee4 100644
--- a/browser/modules/Moat.jsm
+++ b/browser/modules/Moat.jsm
@@ -787,4 +787,25 @@ class MoatRPC {
 
     return map;
   }
+
+  // Request a copy of the defaul/fallback bridge settings, takes the following parameters:
+  // - transports: optional, an array of transports available to the client; if empty (or not
+  //   given) returns settings using all working transports known to the server
+  //
+  // returns an array of settings objects in roughly the same format as the _settings
+  // object on the TorSettings module
+  async circumvention_defaults(transports) {
+    const args = {
+      transports: transports ? transports : [],
+    };
+    const response = await this._makeRequest("circumvention/defaults", args);
+    if ("errors" in response) {
+      const code = response.errors[0].code;
+      const detail = response.errors[0].detail;
+      throw new Error(`MoatRPC: ${detail} (${code})`);
+    } else if ("settings" in response) {
+      return this._fixupSettingsList(response.settings);
+    }
+    return [];
+  }
 }
diff --git a/browser/modules/TorConnect.jsm b/browser/modules/TorConnect.jsm
index 6b501209d844e..59d59b70eaad8 100644
--- a/browser/modules/TorConnect.jsm
+++ b/browser/modules/TorConnect.jsm
@@ -496,12 +496,24 @@ const TorConnect = (() => {
 
                         if (this.transitioning) return;
 
-                        if (this.settings === null) {
-                            // unable to determine country
-                            throw_error(TorStrings.torConnect.autoBootstrappingFailed, TorStrings.torConnect.cannotDetermineCountry);
-                        } else if (this.settings.length === 0) {
-                            // no settings available for country
-                            throw_error(TorStrings.torConnect.autoBootstrappingFailed, TorStrings.torConnect.noSettingsForCountry);
+                        const noCountry = this.settings !== null;
+                        const noLocalizedSettings = this.settings && this.settings.length === 0;
+                        if (noCountry || noLocalizedSettings) {
+                            try {
+                                this.settings = await this.mrpc.circumvention_defaults([...TorBuiltinBridgeTypes, "vanilla"]);
+                            } catch (err) {
+                                console.error("We could not get localized settings, but defaults settings failed as well", err);
+                            }
+                        }
+                        if (this.settings === null || this.settings.length === 0) {
+                            // The fallback has failed as well, so throw the original error
+                            if (noCountry) {
+                                // unable to determine country
+                                throw_error(TorStrings.torConnect.autoBootstrappingFailed, TorStrings.torConnect.cannotDetermineCountry);
+                            } else {
+                                // no settings available for country
+                                throw_error(TorStrings.torConnect.autoBootstrappingFailed, TorStrings.torConnect.noSettingsForCountry);
+                            }
                         }
 
                         // apply each of our settings and try to bootstrap with each

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