From 118ea78d95a82d9f943180c8f976befc5d2dc97e Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 11 Mar 2023 23:12:25 +0100
Subject: Matrix: allow pressing enter on a message with a room alias to join
 the room

---
 src/plugins/Matrix.cpp | 83 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 1 deletion(-)

(limited to 'src/plugins')

diff --git a/src/plugins/Matrix.cpp b/src/plugins/Matrix.cpp
index 062d16a..d847719 100644
--- a/src/plugins/Matrix.cpp
+++ b/src/plugins/Matrix.cpp
@@ -3464,6 +3464,74 @@ namespace QuickMedia {
         return email.substr(0, index);
     }
 
+    // Not 100% correct on the server name part, but good enough
+    static std::string_view extract_matrix_identifier(const char *str, size_t size) {
+        if(size == 0)
+            return {};
+
+        size_t index = 0;
+        switch(str[index]) {
+            case '@':
+            case '!':
+            case '$':
+            case '+':
+            case '#':
+                break;
+            default:
+                return {};
+        }
+
+        ++index;
+        const size_t local_part_start = index;
+        bool found_colon = false;
+        // Parse local part
+        for(; index < size; ++index) {
+            char c = str[index];
+            if((c >= 'a' && c <= 'z') || c == '-' || c == '.' || c == '=' || c == '_' || c == '/') {
+
+            } else if(c == ':') {
+                found_colon = true;
+                break;
+            }
+        }
+
+        if(!found_colon || index - local_part_start == 0)
+            return {};
+
+        ++index;
+        const size_t server_part_start = index;
+        // Parse server name
+        for(; index < size; ++index) {
+            char c = str[index];
+            if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '-' || c == '.' || c == ':' || c == '[' || c == ']') {
+
+            } else {
+                break;
+            }
+        }
+
+        if(index - server_part_start == 0)
+            return {};
+
+        return { str, index };
+    }
+
+    std::vector<std::string> matrix_extract_room_ids(const std::string &str) {
+        std::vector<std::string> result;
+        size_t index = 0;
+        while(index < str.size()) {
+            std::string_view room_id = extract_matrix_identifier(str.data() + index, str.size() - index);
+            // TODO: Support ! room id joining. It doesn't work right now. Seems like matrix itself doesn't support that
+            if(room_id.empty() || (room_id[0] != '#'/* && room_id[0] != '!'*/)) {
+                ++index;
+            } else {
+                index += room_id.size();
+                result.emplace_back(room_id.data(), room_id.size());
+            }
+        }
+        return result;
+    }
+
     static std::string combine_user_display_names_for_room_name(std::vector<std::shared_ptr<UserInfo>> &user_info, const std::string &fallback_user_id) {
         std::string result;
         if(user_info.size() == 0)
@@ -5446,8 +5514,21 @@ namespace QuickMedia {
         return true;
     }
 
+    static std::string room_id_extract_server_name(const std::string &room_id) {
+        size_t index = room_id.find(':');
+        if(index == std::string::npos)
+            return "";
+        else
+            return room_id.substr(index + 1);
+    }
+
     PluginResult Matrix::join_room(const std::string &room_id_or_name) {
         assert(delegate);
+
+        std::string url = homeserver + "/_matrix/client/r0/join/" + url_param_encode(room_id_or_name);
+        if(!room_id_or_name.empty() && room_id_or_name[0] == '!')
+            url += "?via=" + url_param_encode(room_id_extract_server_name(room_id_or_name));
+
         std::vector<CommandArg> additional_args = {
             { "-X", "POST" },
             { "-H", "content-type: application/json" },
@@ -5457,7 +5538,7 @@ namespace QuickMedia {
 
         rapidjson::Document json_root;
         std::string err_msg;
-        DownloadResult download_result = download_json(json_root, homeserver + "/_matrix/client/r0/join/" + url_param_encode(room_id_or_name), std::move(additional_args), true, &err_msg);
+        DownloadResult download_result = download_json(json_root, url, std::move(additional_args), true, &err_msg);
         if(download_result != DownloadResult::OK) return download_result_to_plugin_result(download_result);
 
         if(!json_root.IsObject())
-- 
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