Use Location access hashes.

GitOrigin-RevId: 1f018d5e42e1c657492f2e1da74700632825c8f9

td/generate/scheme/td_api.tl

@@ -3277,7 +3277,7 @@ setStickerPositionInSet sticker:InputFile position:int32 = Ok;
 removeStickerFromSet sticker:InputFile = Ok;
 
 
-//@description Returns information about a file with a map thumbnail @location Location of the map center @zoom Map zoom level; 13-20 @width Map width in pixels before applying scale; 16-1024 @height Map height in pixels before applying scale; 16-1024 @scale Map scale; 1-3 @chat_id Identifier of a chat, in which the thumbnail will be shown. Use 0 if unknown
+//@description Returns information about a file with a map thumbnail in PNG format @location Location of the map center @zoom Map zoom level; 13-20 @width Map width in pixels before applying scale; 16-1024 @height Map height in pixels before applying scale; 16-1024 @scale Map scale; 1-3 @chat_id Identifier of a chat, in which the thumbnail will be shown. Use 0 if unknown
 getMapThumbnailFile location:location zoom:int32 width:int32 height:int32 scale:int32 chat_id:int53 = File;
 
 

td/telegram/Global.cpp

@@ -21,6 +21,8 @@
 #include "td/utils/port/Clocks.h"
 #include "td/utils/tl_helpers.h"
 
+#include <cmath>
+
 namespace td {
 
 Global::Global() = default;
@@ -120,4 +122,37 @@ void Global::set_shared_config(std::unique_ptr<ConfigShared> shared_config) {
   shared_config_ = std::move(shared_config);
 }
 
+int64 Global::get_location_key(double latitude, double longitude) {
+  const double PI = 3.14159265358979323846;
+  latitude *= PI / 180;
+  longitude *= PI / 180;
+
+  int64 key = 0;
+  if (latitude < 0) {
+    latitude = -latitude;
+    key = 65536;
+  }
+
+  double f = std::tan(PI / 4 - latitude / 2);
+  key += static_cast<int64>(f * std::cos(longitude) * 128) * 256;
+  key += static_cast<int64>(f * std::sin(longitude) * 128);
+  return key;
+}
+
+int64 Global::get_location_access_hash(double latitude, double longitude) {
+  auto it = location_access_hashes_.find(get_location_key(latitude, longitude));
+  if (it == location_access_hashes_.end()) {
+    return 0;
+  }
+  return it->second;
+}
+
+void Global::add_location_access_hash(double latitude, double longitude, int64 access_hash) {
+  if (access_hash == 0) {
+    return;
+  }
+
+  location_access_hashes_[get_location_key(latitude, longitude)] = access_hash;
+}
+
 }  // namespace td

td/telegram/Global.h

@@ -28,6 +28,7 @@
 #include <atomic>
 #include <memory>
 #include <mutex>
+#include <unordered_map>
 
 namespace td {
 class AnimationsManager;
@@ -301,6 +302,10 @@ class Global : public ActorContext {
     net_stats_file_callbacks_ = std::move(callbacks);
   }
 
+  int64 get_location_access_hash(double latitude, double longitude);
+
+  void add_location_access_hash(double latitude, double longitude, int64 access_hash);
+
  private:
   std::shared_ptr<DhConfig> dh_config_;
 
@@ -346,6 +351,10 @@ class Global : public ActorContext {
 
   int32 my_id_ = 0;  // hack
 
+  static int64 get_location_key(double latitude, double longitude);
+
+  std::unordered_map<int64, int64> location_access_hashes_;
+
   void do_close(Promise<> on_finish, bool destroy_flag);
 };
 

td/telegram/Location.cpp

@@ -6,6 +6,7 @@
 //
 #include "td/telegram/Location.h"
 
+#include "td/telegram/Global.h"
 #include "td/telegram/secret_api.h"
 #include "td/telegram/td_api.h"
 #include "td/telegram/telegram_api.h"
@@ -23,6 +24,7 @@ void Location::init(double latitude, double longitude, int64 access_hash) {
     latitude_ = latitude;
     longitude_ = longitude;
     access_hash_ = access_hash;
+    G()->add_location_access_hash(latitude_, longitude_, access_hash_);
   }
 }
 

td/telegram/Location.h

@@ -6,16 +6,17 @@
 //
 #pragma once
 
-#include "td/utils/common.h"
-#include "td/utils/StringBuilder.h"
-#include "td/utils/tl_helpers.h"
+#include "td/telegram/Global.h"
+#include "td/telegram/SecretInputMedia.h"
+#include "td/telegram/Version.h"
 
 #include "td/telegram/secret_api.h"
 #include "td/telegram/td_api.h"
 #include "td/telegram/telegram_api.h"
 
-#include "td/telegram/SecretInputMedia.h"
-#include "td/telegram/Version.h"
+#include "td/utils/common.h"
+#include "td/utils/StringBuilder.h"
+#include "td/utils/tl_helpers.h"
 
 namespace td {
 
@@ -98,6 +99,7 @@ class Location {
     parse(longitude_, parser);
     if (has_access_hash) {
       parse(access_hash_, parser);
+      G()->add_location_access_hash(latitude_, longitude_, access_hash_);
     }
   }
 };

td/telegram/files/FileGenerateManager.cpp

@@ -152,7 +152,6 @@ class MapDownloadGenerateActor : public FileGenerateActor {
     TRY_RESULT(width, to_integer_safe<int32>(parts[5]));
     TRY_RESULT(height, to_integer_safe<int32>(parts[6]));
     TRY_RESULT(scale, to_integer_safe<int32>(parts[7]));
-    int64 access_hash = 0;
 
     if (zoom < 13 || zoom > 20) {
       return Status::Error("Wrong zoom");
@@ -171,12 +170,13 @@ class MapDownloadGenerateActor : public FileGenerateActor {
       return Status::Error("Wrong scale");
     }
 
-    file_name_ = PSTRING() << "map_" << zoom << "_" << x << "_" << y << ".jpg";
+    file_name_ = PSTRING() << "map_" << zoom << "_" << x << "_" << y << ".png";
 
     const double PI = 3.14159265358979323846;
     double longitude = (x + 0.1) * 360.0 / size - 180;
     double latitude = 90 - 360 * std::atan(std::exp(((y + 0.1) / size - 0.5) * 2 * PI)) / PI;
 
+    int64 access_hash = G()->get_location_access_hash(latitude, longitude);
     return make_tl_object<telegram_api::inputWebFileGeoPointLocation>(
         make_tl_object<telegram_api::inputGeoPoint>(latitude, longitude), access_hash, width, height, zoom, scale);
   }