Use template file for config generation to ensure valid YAML

config.template.yaml

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+homeserver:
+    address: https://matrix.beeper.com/_hungryserv/inswe
+    domain: beeper.local
+    verify_ssl: true
+    software: hungry
+    http_retry_count: 4
+    async_media: true
+    websocket: true
+    ping_interval_seconds: -1
+
+appservice:
+    address: http://localhost:29317
+    hostname: 0.0.0.0
+    port: 29317
+    max_body_size: 1
+    database: sqlite:////data/bridge.db
+    id: REPLACE_REG_ID
+    bot_username: REPLACE_BOT_USERNAME
+    as_token: REPLACE_AS_TOKEN
+    hs_token: REPLACE_HS_TOKEN
+    ephemeral_events: true
+    async_transactions: true
+
+metrics:
+    enabled: false
+    listen_port: 8000
+
+manhole:
+    enabled: false
+
+bridge:
+    username_template: telegram_{userid}
+    alias_template: telegram_{groupname}
+    displayname_template: '{displayname}'
+    displayname_preference:
+    - full name
+    - username
+    - phone number
+    displayname_max_length: 100
+    allow_avatar_remove: true
+    allow_contact_info: true
+    max_initial_member_sync: 20
+    max_member_count: 10000
+    sync_channel_members: false
+    skip_deleted_members: true
+    startup_sync: false
+    sync_update_limit: 0
+    sync_create_limit: 10
+    sync_deferred_create_all: true
+    sync_direct_chats: true
+    max_telegram_delete: 10
+    sync_matrix_state: true
+    allow_matrix_login: true
+    public_portals: false
+    sync_with_custom_puppets: false
+    sync_direct_chat_list: false
+    double_puppet_server_map:
+        beeper.com: https://matrix.beeper.com/_hungryserv/inswe
+    double_puppet_allow_discovery: false
+    telegram_link_preview: true
+    invite_link_resolve: false
+    caption_in_message: true
+    image_as_file_size: 10
+    image_as_file_pixels: 5000000
+    parallel_file_transfer: false
+    federate_rooms: false
+    always_custom_emoji_reaction: false
+    animated_sticker:
+        target: webp
+        convert_from_webm: false
+        args:
+            width: 256
+            height: 256
+            fps: 25
+    animated_emoji:
+        target: webp
+        args:
+            width: 64
+            height: 64
+            fps: 25
+    encryption:
+        allow: true
+        default: true
+        appservice: true
+        msc4190: false
+        require: true
+        allow_key_sharing: true
+        delete_keys:
+            delete_outbound_on_ack: true
+            dont_store_outbound: false
+            ratchet_on_decrypt: true
+            delete_fully_used_on_decrypt: true
+            delete_prev_on_new_session: true
+            delete_on_device_delete: true
+            periodically_delete_expired: true
+            delete_outdated_inbound: true
+        verification_levels:
+            receive: cross-signed-tofu
+            send: cross-signed-tofu
+            share: cross-signed-tofu
+        rotation:
+            enable_custom: true
+            milliseconds: 2592000000
+            messages: 10000
+            disable_device_change_key_rotation: true
+
+    private_chat_portal_meta: default
+    disable_reply_fallbacks: true
+    cross_room_replies: false
+    delivery_receipts: false
+    delivery_error_reports: false
+    incoming_bridge_error_reports: true
+    message_status_events: true
+    resend_bridge_info: false
+    mute_bridging: true
+    pinned_tag: m.favourite
+    archive_tag: m.lowpriority
+    tag_only_on_create: true
+    bridge_matrix_leave: false
+    kick_on_logout: false
+    always_read_joined_telegram_notice: true
+    create_group_on_invite: false
+    backfill:
+        enable: true
+        normal_groups: true
+        unread_hours_threshold: 720
+        forward_limits:
+            initial:
+                user: 50
+                normal_group: 100
+                supergroup: 50
+                channel: 50
+            sync:
+                user: 0
+                normal_group: 0
+                supergroup: 0
+                channel: 0
+        forward_timeout: 900
+        incremental:
+            messages_per_batch: 100
+            post_batch_delay: 20
+            max_batches:
+                user: -1
+                normal_group: -1
+                supergroup: 10
+                channel: -1
+    initial_power_level_overrides:
+        user: {}
+        group: {}
+    bot_messages_as_notices: true
+    bridge_notices:
+        default: false
+        exceptions: []
+    relay_user_distinguishers: ["🟦", "🟣", "🟩", "⭕️", "🔶", "⬛️", "🔵", "🟢"]
+    message_formats:
+        m.text: '$distinguisher <b>$sender_displayname</b>: $message'
+        m.notice: '$distinguisher <b>$sender_displayname</b>: $message'
+        m.emote: '* $distinguisher <b>$sender_displayname</b> $message'
+        m.file: '$distinguisher <b>$sender_displayname</b> sent a file: $message'
+        m.image: '$distinguisher <b>$sender_displayname</b> sent an image: $message'
+        m.audio: '$distinguisher <b>$sender_displayname</b> sent an audio file: $message'
+        m.video: '$distinguisher <b>$sender_displayname</b> sent a video: $message'
+        m.location: '$distinguisher <b>$sender_displayname</b> sent a location: $message'
+    emote_format: '* $mention $formatted_body'
+    state_event_formats:
+        join: $distinguisher <b>$displayname</b> joined the room.
+        leave: $distinguisher <b>$displayname</b> left the room.
+        name_change: $distinguisher <b>$prev_displayname</b> changed their name to $distinguisher <b>$displayname</b>
+    filter:
+        mode: blacklist
+        list: []
+        users: true
+    command_prefix: '!tg'
+    management_room_text:
+        welcome: Hello, I'm a Telegram bridge bot.
+        welcome_connected: Use `help` for help.
+        welcome_unconnected: Use `help` for help or `login` to log in.
+        additional_help: ''
+    management_room_multiple_messages: false
+    permissions:
+        "beeper.local": user
+        "beeper.com": user
+        "@inswe:beeper.com": admin
+    relaybot:
+        private_chat:
+            invite: []
+            state_changes: true
+            message: This is a Matrix bridge relaybot and does not support direct chats
+        group_chat_invite: []
+        ignore_unbridged_group_chat: true
+        authless_portals: true
+        whitelist_group_admins: true
+        ignore_own_incoming_events: true
+        whitelist: []
+
+telegram:
+    api_id: REPLACE_API_ID
+    api_hash: REPLACE_API_HASH
+    bot_token: disabled
+    catch_up: true
+    sequential_updates: true
+    exit_on_update_error: true
+    force_refresh_interval_seconds: 0
+    connection:
+        timeout: 120
+        retries: 5
+        retry_delay: 1
+        flood_sleep_threshold: 60
+        request_retries: 5
+        use_ipv6: false
+    device_info:
+        device_model: Beeper (self-hosted)
+        system_version: auto
+        app_version: auto
+        lang_code: en
+        system_lang_code: en
+    server:
+        enabled: false
+        dc: 2
+        ip: 149.154.167.40
+        port: 80
+    proxy:
+        type: disabled
+
+logging:
+    version: 1
+    formatters:
+        colored:
+            format: "[%(asctime)s] [%(levelname)s@%(name)s] %(message)s"
+            datefmt: "%b %d %H:%M:%S"
+    handlers:
+        console:
+            class: logging.StreamHandler
+            formatter: colored
+            stream: ext://sys.stdout
+    root:
+        level: INFO
+        handlers: [console]