Initial config structs and example config, some whatsapp testing

example-config.yaml

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+# Homeserver details.
+homeserver:
+  # The address that this appservice can use to connect to the homeserver.
+  address: https://matrix.org
+  # The domain of the homeserver (for MXIDs, etc).
+  domain: matrix.org
+
+# Application service host/registration related details.
+# Changing these values requires regeneration of the registration.
+appservice:
+  # The address that the homeserver can use to connect to this appservice.
+  address: http://localhost:8080
+
+  # The hostname and port where this appservice should listen.
+  hostname: 0.0.0.0
+  port: 8080
+
+  # The full URI to the database. Only SQLite is currently supported.
+  database: sqlite:///mautrix-whatsapp.db
+
+  # The unique ID of this appservice.
+  id: whatsapp
+  # Appservice bot details.
+  bot:
+    # Username of the appservice bot.
+    username: whatsappbot
+    # Display name and avatar for bot. Set to "remove" to remove display name/avatar, leave empty
+    # to leave display name/avatar as-is.
+    displayname: WhatsApp bridge bot
+    avatar: mxc://maunium.net/NeXNQarUbrlYBiPCpprYsRqr
+
+  # Authentication tokens for AS <-> HS communication. Autogenerated; do not modify.
+  as_token: "This value is generated when generating the registration"
+  hs_token: "This value is generated when generating the registration"
+
+# Bridge config. Currently unused.
+bridge:
+  # Localpart template of MXIDs for Whatsapp users.
+  # {{.receiver}} is replaced with the Whatsapp user ID of the Matrix user receiving messages.
+  # {{.userid}} is replaced with the user ID of the Whatsapp user.
+  username_template: "whatsapp_{{.Receiver}}_{{.UserID}}"
+  # Displayname template for Whatsapp users.
+  # {{.displayname}} is replaced with the display name of the Whatsapp user.
+  displayname_template: "{{.Displayname}}"
+
+# Logging config.
+logging:
+  # The directory for log files. Will be created if not found.
+  directory: ./logs
+  # Available variables: .date for the file date and .index for different log files on the same day.
+  file_name_format: {{.date}}-{{.index}.log
+  # Date format for file names in the Go time format: https://golang.org/pkg/time/#pkg-constants
+  file_date_format: 2006-01-02
+  # Log file permissions.
+  file_mode: 0600
+  # Timestamp format for log entries in the Go time format.
+  timestamp_format: Jan _2, 2006 15:04:05
+  # Minimum severity for log messages.
+  # Options: debug, info, warn, error, fatal
+  print_level: info